text: between the object and the surface is just its weight, which is equal to its mass multiplied by the acceleration due to earth's gravity, g. If the object is on a tilted surface such as an inclined plane, the normal force is less, because less of the force of gravity is perpendicular to the face of the plane. Therefore, the normal force, and ultimately the frictional force, is determined using vector analysis, usually via a free body diagram. Depending on the situation, the calculation of the normal force may include forces other than gravity.

text: between the object and the surface is just its weight, which is equal to its

entity_name: Mass

text: mass

text: multiplied by the

entity_name: Acceleration

text: acceleration

text: due to earth's gravity,

entity_name: Standard gravity

text: g

text: . If the object is on a tilted surface such as an inclined plane, the normal force is less, because less of the force of gravity is perpendicular to the face of the plane. Therefore, the normal force, and ultimately the frictional force, is determined using

entity_name: Euclidean vector

text: vector

text: analysis, usually via a

entity_name: Free body diagram

text: free body diagram

text: . Depending on the situation, the calculation of the normal force may include forces other than gravity.

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answers: It acts only between objects that are touching.

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answers: Earth's gravity

answers: NDQ_017290

answers: mass multiplied by the acceleration due to earth's gravity, g

text: Differential sensitivity to auxin helps explain Darwin's original observation that stems and roots respond in the opposite way to the forces of gravity. In both roots and stems, auxin accumulates towards the gravity vector on the lower side.  In roots, this results in the inhibition of cell expansion on the lower side and the concomitant curvature of the roots towards gravity (positive gravitropism).  In stems, the auxin also accumulates on the lower side, however in this tissue it increases cell expansion and results in the shoot curving up (statolithic gravitropism).

text: Differential sensitivity to auxin helps explain Darwin's original observation that stems and roots respond in the opposite way to the forces of gravity. In both roots and stems, auxin accumulates towards the gravity vector on the lower side.  In roots, this results in the inhibition of cell expansion on the lower side and the concomitant curvature of the roots towards gravity (positive gravitropism).  In stems, the auxin also accumulates on the lower side, however in this tissue it increases cell expansion and results in the shoot curving up (statolithic gravitropism).

method: Bert-ConvKNRM

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answers: Yes

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answers: Gravity

text: is the standard gravity on the surface of the Earth,

text: is the

text: standard gravity

text: on the surface of the Earth,

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answers: gravity acts only between objects that are touching

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answers: weight

text: The Earth's gravitational field is not uniform but can vary by as much as 0.5% at different locations on Earth (see Earth's gravity). These variations alter the relationship between weight and mass, and must be taken into account in high precision weight measurements that are intended to indirectly measure mass.  Spring scales, which measure local weight, must be calibrated at the location at which the objects will be used to show this standard weight, to be legal for commerce.

text: The Earth's

entity_name: Gravity

text: gravitational field

text: is not uniform but can vary by as much as 0.5% at different locations on Earth (see

entity_name: Gravity of Earth

text: Earth's gravity

text: ). These variations alter the relationship between weight and mass, and must be taken into account in high precision weight measurements that are intended to indirectly measure mass.

entity_name: Spring scale

text: Spring scale

text: s, which measure local weight, must be calibrated at the location at which the objects will be used to show this standard weight, to be legal for commerce.

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text: Exposure to weightlessness causes changes to the signals from the receptors to touch, pressure, and gravity, i.e., all information necessary for postural stability. Adaptive modifications in the central processing of sensory information take place to produce motor responses that are appropriate for the new gravitational environment. As a result, terrestrial motor strategies are progressively abandoned in weightlessness, as astronauts adapt to the weightless environment. This is particularly true for the major postural muscles found in the lower legs. The modifications in posture, movement, and locomotion acquired in reduced gravity are then inappropriate for Earth's gravity upon return. After landing, postural instability approaching clinical ataxia is manifested as a result of this in-flight neural reorganization.

text: Exposure to weightlessness causes changes to the signals from the receptors to

entity_name: Somatosensory system

text: touch

entity_name: Pressure

text: pressure

text: , and

text: gravity

text: , i.e., all information necessary for postural stability. Adaptive modifications in the central processing of sensory information take place to produce motor responses that are appropriate for the new gravitational environment. As a result, terrestrial motor strategies are progressively abandoned in weightlessness, as astronauts adapt to the weightless environment. This is particularly true for the major postural

entity_name: Muscle

text: muscles

text: found in the lower legs. The modifications in posture, movement, and locomotion acquired in reduced gravity are then inappropriate for Earth's gravity upon return. After landing,

entity_name: Balance disorder

text: postural instability

text: approaching clinical

entity_name: Ataxia

text: ataxia

text: is manifested as a result of this in-flight neural reorganization.

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answers: gravity acts only between objects that are touching

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answers: Gravity

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answers: Gravity

text: The arm that results from this calculation must be within the center of gravity limits dictated by the aircraft manufacturer.  If it is not, weight in the aircraft must be removed, added (rarely), or redistributed until the center of gravity falls within the prescribed limits.

text: The arm that results from this calculation must be within the center of gravity limits dictated by the aircraft manufacturer.  If it is not, weight in the aircraft must be removed, added (rarely), or redistributed until the center of gravity falls within the prescribed limits.

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text: While not constant but varying depending on latitude and altitude, the numerical value of the acceleration caused by Earth's gravity on the surface lies between 9.74 and 9.87, which is quite close to 10. This means that as a result of Newton's second law, the weight of a kilogram of mass on Earth's surface corresponds roughly to 10 newtons of force exerted on an object.

text: While not constant but varying depending on

entity_name: Latitude

text: latitude

text: and

entity_name: Altitude

text: altitude

text: , the numerical value of the

entity_name: Gravitational acceleration

text: acceleration caused by Earth's gravity

text: on the surface lies between 9.74 and 9.87, which is quite close to 10. This means that as a result of

entity_name: Newton's laws of motion

text: Newton's second law

text: , the weight of a kilogram of mass on Earth's surface corresponds roughly to 10

entity_name: Newton (unit)

text: newtons

text: of force exerted on an object.

method: dangnt-nlp

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answers: It acts only between objects that are touching.

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answers: NDQ_017290

answers: Newton's second law

text: Another kind of directed distance is that between two different particles or point masses at a given time. For instance, the distance from the center of gravity of the Earth A and the center of gravity of the Moon B (which does not strictly imply motion from A to B) falls into this category.

text: Another kind of directed distance is that between two different particles or point masses at a given time. For instance, the distance from the

entity_name: Center of mass

entity_section: Center of gravity

text: center of gravity

text: of the Earth A and the center of gravity of the Moon B (which does not strictly imply motion from A to B) falls into this category.

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answers: gravity

text: The cylinders rotate to provide artificial gravity on their inner surface. At the radius described by O'Neill, the habitats would have to rotate about twenty-eight times an hour to simulate a standard Earth gravity. Research on human factors in rotating reference framesindicate that, at such low rotation speeds, few people would experience motion sickness due to coriolis forces acting on the inner ear. People would, however, be able to detect spinward and antispinward directions by turning their heads, and any dropped items would appear to be deflected by a few centimetres. The central axis of the habitat would be a zero-gravity region, and it was envisaged that recreational facilities could be located there.

text: The cylinders rotate to provide

entity_name: Artificial gravity

entity_section: Rotation

text: artificial gravity

text: on their inner surface. At the radius described by O'Neill, the habitats would have to rotate about twenty-eight times an hour to simulate a standard Earth

text: gravity

text: . Research on human factors in rotating reference framesindicate that, at such low rotation speeds, few people would experience

entity_name: Motion sickness

text: motion sickness

text: due to

entity_name: Coriolis force

text: coriolis forces

text: acting on the inner ear. People would, however, be able to detect spinward and antispinward directions by turning their heads, and any dropped items would appear to be deflected by a few centimetres. The central axis of the habitat would be a

entity_name: Weightlessness

text: zero-gravity

text: region, and it was envisaged that recreational facilities could be located there.

method: UNH-ecn

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answers: gravity acts only between objects that are touching

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answers: standard Earth

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity

text: In postulate one Archimedes states that "Equal weights at equal distances are in equilibrium" (meaning one equal weight on either side of the lever arm). At propositions four, and five, he expands this observation to include the concept of the centre of gravity; wherein it is proven that the centre of gravity of any system consisting of an even number of equal weights, equally distributed, will be located at the midpoint between the two centre weights (hence introducing multiple weights on either side of the lever arm).

text: In postulate one Archimedes states that "Equal weights at equal distances are in equilibrium" (meaning one equal weight on either side of the lever arm). At propositions four, and five, he expands this observation to include the concept of the

text: centre of gravity

text: ; wherein it is proven that the

text: centre of gravity

text: of any system consisting of an even number of equal weights, equally distributed, will be located at the midpoint between the two centre weights (hence introducing multiple weights on either side of the lever arm).

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answers: It acts only between objects that are touching.

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answers: centre weights

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answers: Yes

answers: NDQ_017290

answers: equal weights

text: The difference between the original gravity of the wort and the final gravity of the beer is an indication of how much sugar has been turned into alcohol. The bigger the difference, the greater the amount of alcohol present and hence the stronger the beer. This is why strong beers are sometimes referred to as high gravity beers, and "session" or "small" beers are called low gravity beers, even though in theory the final gravity of a strong beer might be lower than that of a session beer because of the greater amount of alcohol present.

text: The difference between the original gravity of the wort and the final gravity of the beer is an indication of how much sugar has been turned into alcohol. The bigger the difference, the greater the amount of alcohol present and hence the stronger the beer. This is why strong beers are sometimes referred to as high gravity beers, and "session" or "small" beers are called low gravity beers, even though in theory the final gravity of a strong beer might be lower than that of a session beer because of the greater amount of alcohol present.

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answers: It doesn't

answers: NDQ_017283

answers: alcohol content

answers: NDQ_017284

answers: strong beers

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity

text: This formula works with extract given in weight percentages or degree Plato. Extract refers to all the non water substances (sugars, dextrins, proteins, vitamins, minerals, etc.) that are present in the wort. The percent extract or Plato scale is a measure in percent of how much of the wort’s weight is extract. Since, at least in the wort and beer gravities that most brewers work with, an almost linear relationship between (specific gravity − 1) and extract percentages exists, the above formula can also be expressed as:

text: This formula works with extract given in weight percentages or degree Plato. Extract refers to all the non water substances (sugars, dextrins, proteins, vitamins, minerals, etc.) that are present in the wort. The percent extract or

text: Plato scale

text: is a measure in percent of how much of the wort’s weight is extract. Since, at least in the wort and beer gravities that most brewers work with, an almost linear relationship between (specific gravity − 1) and extract percentages exists, the above formula can also be expressed as:

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answers: Gravity acts only between objects that are touching.

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answers: weight percentages

text: A balance on the other hand, compares the weight of an unknown object in one scale pan to the weight of standard masses in the other, using a lever mechanism – a lever-balance. The standard masses are often referred to, non-technically, as "weights".  Since any variations in gravity will act equally on the unknown and the known weights, a lever-balance will indicate the same value at any location on Earth.  Therefore, balance "weights" are usually calibrated and marked in mass units, so the lever-balance measures mass by comparing the Earth's attraction on the unknown object and standard masses in the scale pans.  In the absence of a gravitational field, away from planetary bodies (e.g. space), a lever-balance would not work, but on the Moon, for example, it would give the same reading as on Earth. Some balances can be marked in weight units, but since the weights are calibrated at the factory for standard gravity, the balance will measure standard weight, i.e. what the object would weigh at standard gravity, not the actual local force of gravity on the object.

text: A

entity_name: Weighing scale

entity_section: balance

text: balance

text: on the other hand, compares the weight of an unknown object in one scale pan to the weight of standard masses in the other, using a

entity_name: Lever

text: lever

text: mechanism – a lever-balance. The standard masses are often referred to, non-technically, as "weights".  Since any variations in gravity will act equally on the unknown and the known weights, a lever-balance will indicate the same value at any location on Earth.  Therefore, balance "weights" are usually calibrated and marked in

text: mass

text: units, so the lever-balance measures mass by comparing the Earth's attraction on the unknown object and standard masses in the scale pans.  In the absence of a gravitational field, away from planetary bodies (e.g. space), a lever-balance would not work, but on the Moon, for example, it would give the same reading as on Earth. Some balances can be marked in weight units, but since the weights are calibrated at the factory for standard gravity, the balance will measure standard weight, i.e. what the object would weigh at standard gravity, not the actual local force of gravity on the object.

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answers: The absence of a gravitational field

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answers: Earth's attraction

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answers: what the object would weigh at standard gravity

text: All bodies of a sufficiently large size have gravity.  This gravity usually (but not always) exerts a force equal to the standard gravitational attraction on the surface of an Earth-sized planetary body.  Gravity in the Spelljammer universe is also an exceptionally convenient force, and almost always works such that "down" orients itself in a manner most humanoids would find sensible.

text: All bodies of a sufficiently large size have

text: gravity

text: .  This gravity usually (but not always) exerts a force equal to the standard gravitational attraction on the surface of an Earth-sized planetary body.  Gravity in the Spelljammer universe is also an exceptionally convenient force, and almost always works such that "down" orients itself in a manner most humanoids would find sensible.

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answers: All bodies of a sufficiently large size

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answers: Spelljammer universe

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answers: All bodies

answers: NDQ_017290

answers: Gravity

text: Already in the early days of its existence, the International Committee for Weights and Measures (CIPM) proceeded to define a standard thermometric scale, using the boiling point of water. Since the boiling point varies with the atmospheric pressure, the CIPM needed to define a standard atmospheric pressure. The definition they chose was based on the weight of a column of mercury of 760 mm. But since that weight depends on the local gravity, they now also needed a standard gravity. The 1887 CIPM meeting decided as follows:All that was needed to obtain a numerical value for standard gravity was now to measure the gravitational strength at the International Bureau. This task was given to Gilbert Étienne Defforges of the Geographic Service of the French Army. The value he found, based on measurements taken in March and April 1888, was 9.80991(5) m·s.

text: Already in the early days of its existence, the

entity_name: International Committee for Weights and Measures

text: International Committee for Weights and Measures

text: (CIPM) proceeded to define a standard

entity_name: Thermometer

text: thermometric

text: scale, using the

entity_name: Boiling point

text: boiling point

text: of water. Since the boiling point varies with the

entity_name: Atmospheric pressure

text: atmospheric pressure

text: , the CIPM needed to define a standard atmospheric pressure. The definition they chose was based on the weight of a column of

entity_name: Mercury (element)

text: mercury

text: of 760 mm. But since that weight depends on the local gravity, they now also needed a standard gravity. The 1887 CIPM meeting decided as follows:All that was needed to obtain a numerical value for standard gravity was now to measure the gravitational strength at the

entity_name: International Bureau of Weights and Measures

text: International Bureau

text: . This task was given to Gilbert Étienne Defforges of the Geographic Service of the French Army. The value he found, based on measurements taken in March and April 1888, was 9.80991(5) m·s.

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answers: Weights and Measures

text: The geoid is a surface along which the gravity potential is everywhere equal and to which the direction of gravity is always perpendicular (see equipotential surface). The latter is particularly important because optical instruments containing gravity-reference leveling devices are commonly used to make geodetic measurements. When properly adjusted, the vertical axis of the instrument coincides with the direction of gravity and is, therefore, perpendicular to the geoid. The angle between the plumb line which is perpendicular to the geoid (sometimes called "the vertical") and the perpendicular to the ellipsoid (sometimes called "the ellipsoidal normal") is defined as the deflection of the vertical. It has two components: an east-west and a north-south component.

text: The geoid is a surface along which the gravity potential is everywhere equal and to which the direction of gravity is always perpendicular (see

entity_name: Equipotential surface

text: equipotential surface

text: ). The latter is particularly important because optical instruments containing gravity-reference leveling devices are commonly used to make geodetic measurements. When properly adjusted, the vertical axis of the instrument coincides with the direction of gravity and is, therefore, perpendicular to the geoid. The angle between the

entity_name: Plumb bob

text: plumb line

text: which is perpendicular to the geoid (sometimes called "the vertical") and the perpendicular to the ellipsoid (sometimes called "the ellipsoidal normal") is defined as the

entity_name: Vertical deflection

text: deflection of the vertical

text: . It has two components: an east-west and a north-south component.

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text: In classical physics, gravity exerts a constant downward force F=(0, 0, F) on the center of mass of a body moving near the surface of the Earth.  The work of gravity on a body moving along a trajectory r(t) = (x(t), y(t), z(t)), such as the track of a roller coaster is calculated using its velocity, v=(v, v, v), to obtain

text: In classical physics, gravity exerts a constant downward force F=(0, 0, F) on the center of mass of a body moving near the surface of the Earth.  The work of gravity on a body moving along a trajectory r(t) = (x(t), y(t), z(t)), such as the track of a roller coaster is calculated using its velocity, v=(v, v, v), to obtain

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answers: It does not.

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answers: mass

text: Since more than 90% of all the dissolved solids in grape juice are sugars, measuring the must weight is a good indicator of the amount of sugars in the wine. Rather than measure the actual "weight" of the must, the density or specific gravity of the juice is measured in relation to the specific gravity of distilled water. Viticulturists and winemakers can use a refractometer which uses a refractive index to indirectly measure the must weight from the juice of a single grape or they can use a hydrometer in the winery with the juice from several dozen or hundreds of grape berries. Different countries around the world use various scales to measure the must weight of grape juice. In the United States, New Zealand, and parts of Australia it is measured in degrees brix (symbol °Bx); in Germany (wine) it is degrees Oechsle (°Oe); in France and most of Europe the Baumé scale is used and in Austria the Klosterneuburger Mostwaage (°KMW) scale is used.

text: Since more than 90% of all the dissolved solids in grape juice are sugars, measuring the

entity_name: Must weight

text: must weight

text: is a good indicator of the amount of

entity_name: Sugars in wine

text: sugars in the wine

text: . Rather than measure the actual "weight" of the must, the

entity_name: Density

text: density

text: or

entity_name: Specific gravity

text: specific gravity

text: of the juice is measured in relation to the specific gravity of

entity_name: Distilled water

text: distilled water

text: . Viticulturists and winemakers can use a

entity_name: Refractometer

text: refractometer

text: which uses a

entity_name: Refractive index

text: refractive index

text: to indirectly measure the must weight from the juice of a single grape or they can use a

entity_name: Hydrometer

text: hydrometer

text: in the winery with the juice from several dozen or hundreds of grape berries. Different countries around the world use various scales to measure the must weight of grape juice. In the

entity_name: American wine

text: United States

entity_name: New Zealand wine

text: New Zealand

text: , and parts of

text: Australia

text: it is measured in degrees

text: brix

text: (symbol °Bx); in

text: Germany (wine)

text: it is degrees

text: Oechsle

text: (°Oe); in

text: France

text: and most of Europe the

text: Baumé scale

text: is used and in

text: Austria

text: the

text: Klosterneuburger Mostwaage

text: (°KMW) scale is used.

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answers: scales

text: , the gravitation becomes important for NTS. A proper name for such an object is a star. A boson-field Q-star looks like a big Q-ball. The way gravity changes E(Q) dependence is sketched here. It is the gravity what makes

text: , the gravitation becomes important for NTS. A proper name for such an object is a star. A boson-field Q-star looks like a big Q-ball. The way gravity changes E(Q) dependence is sketched here. It is the gravity what makes

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text: Earth-to-space habitat trade would be easier than Earth-to-planetary colony trade, as colonies orbiting Earth will not have a gravity well to overcome to export to Earth, and a smaller gravity well to overcome to import from Earth.

text: Earth-to-space habitat trade would be easier than Earth-to-planetary colony trade, as colonies orbiting Earth will not have a

text: gravity well

text: to overcome to export to Earth, and a smaller gravity well to overcome to import from Earth.

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answers: Gravity

text: A gravimeter is an instrument used in gravimetry for measuring the local gravitational field of the Earth.  A gravimeter is a type of accelerometer, specialized for measuring the constant downward acceleration of gravity, which varies by about 0.5% over the surface of the Earth. Though the essential principle of design is the same as in other accelerometers, gravimeters are typically designed to be much more sensitive in order to measure very tiny fractional changes within the Earth's gravity of 1 g, caused by nearby geologic structures or the shape of the Earth and by temporal tidal variations.  This sensitivity means that gravimeters are susceptible to extraneous vibrations including noise that tend to cause oscillatory accelerations.  In practice this is counteracted by integral vibration isolation and signal processing. The constraints on temporal resolution are usually less for gravimeters, so that resolution can be increased by processing the output with a longer time constant.  Gravimeters display their measurements in units of gals (cm/s), instead of more common units of acceleration.

text: A gravimeter is an instrument used in

text: gravimetry

text: for measuring the local

text: gravitational field

text: of the Earth.  A gravimeter is a type of

text: accelerometer

text: , specialized for measuring the constant downward

text: acceleration of gravity

text: , which varies by about 0.5% over the surface of the Earth. Though the essential principle of design is the same as in other accelerometers, gravimeters are typically designed to be much more sensitive in order to measure very tiny fractional changes within the

text: Earth

text: 's

text: gravity

text: of 1

text: g

text: , caused by nearby geologic structures or the shape of the Earth and by temporal

text: tidal

text: variations.  This sensitivity means that gravimeters are susceptible to extraneous

text: vibration

text: s including

text: noise

text: that tend to cause oscillatory accelerations.  In practice this is counteracted by integral vibration isolation and

text: signal processing

text: . The constraints on

text: temporal resolution

text: are usually less for gravimeters, so that resolution can be increased by processing the output with a longer

text: time constant

text: .  Gravimeters display their measurements in units of

text: gal

text: s (cm/s), instead of more common units of acceleration.

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answers: It acts only between objects that are touching.

answers: NDQ_017283

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answers: Gravimeters

text: In the anime Dragon Ball Z, gravity simulation plays a key part in various characters' training regime. It is also used to demonstrate the characters' increasing strength. For example, when Goku first arrives on King Kai's planet, he is nearly crushed by the gravity, which is ten times that of Earth's. By the end of his visit, nearly a year later, he is able to move at great speed under such conditions. This method of training gradually appears more and more in the universe, and the gravity gets stronger as well. Ten times Earth's gravity goes from a seemingly indomitable level of opposition to nothing, and several hundred times Earth's gravity becomes the standard. Vegeta even had a Gravity Room built into his house.

text: In the anime

text: Dragon Ball Z

text: , gravity simulation plays a key part in various characters' training regime. It is also used to demonstrate the characters' increasing strength. For example, when

text: Goku

text: first arrives on King Kai's planet, he is nearly crushed by the gravity, which is ten times that of Earth's. By the end of his visit, nearly a year later, he is able to move at great speed under such conditions. This method of training gradually appears more and more in the universe, and the gravity gets stronger as well. Ten times Earth's gravity goes from a seemingly indomitable level of opposition to nothing, and several hundred times Earth's gravity becomes the standard.

text: Vegeta

text: even had a Gravity Room built into his house.

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answers: It acts only between objects that are touching

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answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity

text: Conveyors can be powered by a wide variety of forms of power sources: electric motors, internal combustion engines, steam engines, or gravity. Gravity is particularly common in mountainous mining concerns, and directly employed; the weight of loaded down-going containers pulling the returning empties back up the slope. Gravity can also be used indirectly, where running water is available; a waterwheel is powered by gravity acting on water, and is used to power the cable.

text: Conveyors can be powered by a wide variety of forms of power sources:

text: electric motors

text: internal combustion engines

text: steam engines

text: , or

text: gravity

text: . Gravity is particularly common in mountainous mining concerns, and directly employed; the weight of loaded down-going containers pulling the returning empties back up the slope. Gravity can also be used indirectly, where running water is available; a

text: waterwheel

text: is powered by gravity acting on water, and is used to power the cable.

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answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity

text: There are two types of gravimeters: relative and absolute.  Absolute gravimeters measure the local gravity in absolute units, gals.  Relative gravimeters compare the value of gravity at one point with another.  They must be calibrated at a location where the gravity is known accurately, and then transported to the location where the gravity is to be measured.  They measure the ratio of the gravity at the two points.

text: There are two types of gravimeters: relative and absolute.  Absolute gravimeters measure the local gravity in absolute units, gals.  Relative gravimeters compare the value of gravity at one point with another.  They must be calibrated at a location where the gravity is known accurately, and then transported to the location where the gravity is to be measured.  They measure the ratio of the gravity at the two points.

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answers: Relative gravimeters

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answers: Absolute

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravimeters

text: The current understanding of gravity is based on Albert Einstein's general theory of relativity, which is formulated within the framework of classical physics. On the other hand, the nongravitational forces are described within the framework of quantum mechanics, a radically different formalism for describing physical phenomena based on the wave-like nature of matter. The necessity of a quantum mechanical description of gravity follows from the fact that one cannot consistently couple a classical system to a quantum one.

text: The current understanding of

text: gravity

text: is based on

text: Albert Einstein

text: 's

text: general theory of relativity

text: , which is formulated within the framework of

text: classical physics

text: . On the other hand, the

text: nongravitational forces

text: are described within the framework of quantum mechanics, a radically different formalism for describing physical phenomena based on the wave-like nature of matter. The necessity of a quantum mechanical description of gravity follows from the fact that one cannot consistently couple a classical system to a quantum one.

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answers: Einstein's general theory of relativity

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answers: Albert Einstein

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity

text: Gravity walls depend on the size and weight of the wall mass to resist pressures from behind. Gravity walls will often have a slight setback, or batter, to improve wall stability. For short, landscaping walls, gravity walls made from dry-stacked (mortarless) stone or segmental concrete units (masonry units) are commonly used.

text: Gravity walls depend on the size and weight of the wall mass to resist pressures from behind. Gravity walls will often have a slight setback, or batter, to improve wall stability. For short, landscaping walls, gravity walls made from dry-stacked (mortarless) stone or segmental concrete units (masonry units) are commonly used.

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text: With an incomplete theory of quantum gravity, it is impossible to be certain what space-time would look like at small scales. Also, our understanding of the quantum foam will necessarily be ambiguous as long as there are many competing proposals for a theory of quantum gravity.

text: With an incomplete theory of

text: quantum gravity

text: , it is impossible to be certain what space-time would look like at small scales. Also, our understanding of the quantum foam will necessarily be ambiguous as long as there are many competing proposals for a theory of quantum gravity.

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text: A common illustration concerns the Moon in the field of the Earth. Using the weighted-average definition, the Moon has a center of gravity that is lower (closer to the Earth) than its center of mass, because its lower portion is more strongly influenced by the Earth's gravity.

text: A common illustration concerns the

text: Moon

text: in the field of the

text: Earth

text: . Using the weighted-average definition, the Moon has a center of gravity that is lower (closer to the Earth) than its center of mass, because its lower portion is more strongly influenced by the Earth's gravity.

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answers: Yes

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answers: weighted-average

text: During the day, Astronaut Sunita Williams, in the 192nd day of her spaceflight, did more exercise to help prepare her to gravity back on Earth.

text: During the day, Astronaut Sunita Williams, in the 192nd day of her spaceflight, did more exercise to help prepare her to gravity back on Earth.

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text: is the acceleration due to Earth's gravity,

text: is the acceleration due to Earth's gravity,

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text: The Excalibur was enormous in size, [a mile and a quarter long (6,600 feet), 2012 meters (stated in the 1st. episode of the Crusade)] (2990) in length and was one of the first ships built by humans to use artificial gravity technology provided by the Minbari. The gravity field provides workable gravity just under that found on Earth. A human would weigh slightly less on the ship than they would on Earth.

text: The Excalibur was enormous in size, [a mile and a quarter long (6,600 feet), 2012 meters (stated in the 1st. episode of the Crusade)] (2990) in length and was one of the first ships built by humans to use

text: artificial gravity

text: technology provided by the

text: Minbari

text: . The gravity field provides workable gravity just under that found on Earth. A human would weigh slightly less on the ship than they would on Earth.

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answers: A human would weigh slightly less on the ship

text: In The Martian (Weir novel) and the film of the same title, the Hermes spacecraft achieves artificial gravity by design; it employs a ringed structure, at whose periphery forces around 40% of Earth's gravity are experienced. Such artificial gravity is similar in strength to the gravity on Mars. At the center of the ringed structure, lack of gravity makes the astronauts practically weightless.

text: In

text: The Martian (Weir novel)

text: and the film of the same title, the Hermes spacecraft achieves artificial gravity by design; it employs a ringed structure, at whose periphery forces around 40% of Earth's gravity are experienced. Such artificial gravity is similar in strength to the gravity on Mars. At the center of the ringed structure, lack of gravity makes the astronauts practically weightless.

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text: is the acceleration due to gravity (typically the Standard gravity).

text: is the

text: acceleration due to gravity

text: (typically the

text: Standard gravity

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text: Teton Gravity Research "The Dream Factory"

text: Teton Gravity Research "The Dream Factory"

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text: The definition and use of 'weightlessness' is difficult unless it is understood that the sensation of "weight" in everyday terrestrial experience results not from gravitation acting alone (which is not felt), but instead by the mechanical forces that resist gravity. An object in a straight free fall, or in a more complex inertial trajectory of free fall (such as within a reduced gravity aircraft or inside a space station), all experience weightlessness, since they do not experience the mechanical forces that cause the sensation of weight.

text: The definition and use of 'weightlessness' is difficult unless it is understood that the sensation of "weight" in everyday terrestrial experience results not from gravitation acting alone (which is not felt), but instead by the mechanical forces that resist gravity. An object in a straight free fall, or in a more complex inertial trajectory of free fall (such as within a

text: reduced gravity aircraft

text: or inside a space station), all experience weightlessness, since they do not experience the mechanical forces that cause the sensation of weight.

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text: Special relativity is defined in the absence of gravity, so for practical applications, it is a suitable model whenever gravity can be neglected. Bringing gravity into play, and assuming the universality of free fall, an analogous reasoning as in the previous section applies: there are no global inertial frames. Instead there are approximate inertial frames moving alongside freely falling particles. Translated into the language of spacetime: the straight time-like lines that define a gravity-free inertial frame are deformed to lines that are curved relative to each other, suggesting that the inclusion of gravity necessitates a change in spacetime geometry.

text: Special relativity is defined in the absence of gravity, so for practical applications, it is a suitable model whenever gravity can be neglected. Bringing gravity into play, and assuming the universality of free fall, an analogous reasoning as in the previous section applies: there are no global

text: inertial frame

text: s. Instead there are approximate inertial frames moving alongside freely falling particles. Translated into the language of spacetime: the straight

text: time-like

text: lines that define a gravity-free inertial frame are deformed to lines that are curved relative to each other, suggesting that the inclusion of gravity necessitates a change in spacetime geometry.

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answers: Gravity acts only between objects that are touching

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text: The balance (also balance scale, beam balance and laboratory balance) was the first mass measuring instrument invented. In its traditional form, it consists of a pivoted horizontal lever with arms of equal lengththe beamand a weighing pan suspended from each arm (hence the plural name "scales for a weighing instrument). The unknown mass is placed in one pan and standard masses of known weight are added to the other pan until the beam is as close to equilibrium as possible. In precision balances, a more accurate determination of the mass is given by the position of a sliding mass moved along a graduated scale. Technically, a balance compares weight rather than mass, but, in a given gravitational field (such as Earth's gravity), the weight of an object is proportional to its mass, so the standard "weights" used with balances are usually labeled in units of mass (g, kg, etc.).

text: The balance (also balance scale, beam balance and laboratory balance) was the first mass measuring instrument invented. In its traditional form, it consists of a pivoted horizontal

text: lever

text: with arms of equal lengththe

text: beam

text: and a weighing pan suspended from each arm (hence the plural name "scales for a weighing instrument). The unknown mass is placed in one pan and standard masses of known weight are added to the other pan until the beam is as close to

text: equilibrium

text: as possible. In precision balances, a more accurate determination of the mass is given by the position of a sliding mass moved along a graduated scale. Technically, a balance compares

text: weight

text: rather than mass, but, in a given

text: gravitational field

text: (such as

text: Earth's gravity

text: ), the weight of an object is proportional to its mass, so the standard "weights" used with balances are usually labeled in

text: units of mass

text: g

text: kg

text: , etc.).

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answers: It consists of a pivoted horizontal lever with arms of equal lengththe beamand a weighing pan suspended from each arm

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answers: a balance compares weight rather than mass

text: The last page of folio 2 talks about rounded balances and how they react to gravity. Leonardo writes that if a balance was suspended in its center of gravity, then it would not move or oscillate, regardless of position. He then goes on to say that if there are two weights of equal mass on the ends of this balance, then, when moved from its starting position, the balance will never return to the starting position. After this, he theorizes that a balance in this same situation will move if one of the weights is along a straighter line of descent as compared to the other weight. He then disproves his theory by showing the balance and weights as symmetrically equal, meaning there is no reason for the balance to move.

text: The last page of folio 2 talks about rounded balances and how they react to gravity. Leonardo writes that if a balance was suspended in its center of gravity, then it would not move or oscillate, regardless of position. He then goes on to say that if there are two weights of equal mass on the ends of this balance, then, when moved from its starting position, the balance will never return to the starting position. After this, he theorizes that a balance in this same situation will move if one of the weights is along a straighter line of descent as compared to the other weight. He then disproves his theory by showing the balance and weights as symmetrically equal, meaning there is no reason for the balance to move.

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answers: It acts only between objects that are touching.

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answers: Yes

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answers: rounded balances

text: Celestia also does not simulate gravity. That means, for example, that a near-Earth object approaching the Earth will not collide with the planet after being caught by the Earth's gravity unless the person who defined the NEO's trajectory for Celestia included that effect.

text: Celestia also does not simulate

text: gravity

text: . That means, for example, that a

text: near-Earth object

text: approaching the Earth will not collide with the planet after being caught by the Earth's gravity unless the person who defined the NEO's trajectory for Celestia included that effect.

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answers: Gravity

text: At Mirs orbital altitude, the force of Earth's gravity was 88% of sea level gravity. While the constant free fall of the station offered a perceived sensation of weightlessness, the onboard environment was not one of weightlessness or zero gravity. The environment was, however, often described as microgravity. This state of perceived weightlessness was not perfect, however, being disturbed by five separate effects:

text: At Mirs orbital altitude, the force of Earth's gravity was 88% of sea level gravity. While the constant free fall of the station offered a perceived sensation of

text: weightlessness

text: , the onboard environment was not one of weightlessness or zero gravity. The environment was, however, often described as

text: microgravity

text: . This state of perceived weightlessness was not perfect, however, being disturbed by five separate effects:

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answers: Gravity acts only between objects that are touching

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answers: Earth's gravity

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answers: weightlessness

text: Unlike density, specific weight is not absolute.  It depends upon the value of the gravitational acceleration, which varies with location.  A significant influence upon the value of specific gravity is the temperature  of the material.  Pressure may also affect values, depending upon the bulk modulus of the material, but generally, at moderate pressures, has a less significant effect than the other factors.

text: Unlike density, specific weight is not

text: absolute

text: .  It depends upon the value of the

text: gravitational acceleration

text: , which varies with location.  A significant influence upon the value of specific gravity is the

text: temperature

text: of the material.

text: Pressure

text: may also affect values, depending upon the

text: bulk modulus

text: of the material, but generally, at moderate pressures, has a less significant effect than the other factors.

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answers: Gravity acts only between objects that are touching

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answers: location

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answers: temperature

answers: NDQ_017286

answers: Gravitation

answers: NDQ_017290

answers: specific gravity

text: In Book VII of his De Architectura, the Roman engineer and architect Vitruvius contends that gravity is not dependent on a substance's "weight" but rather on its "nature" (cf. specific gravity).

text: In Book VII of his

text: De Architectura

text: , the Roman engineer and architect

text: Vitruvius

text: contends that gravity is not dependent on a substance's "weight" but rather on its "nature" (cf.

text: specific gravity

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answers: It acts between objects that are touching

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answers: specific gravity

answers: NDQ_017286

answers: yes

answers: NDQ_017290

answers: weight

text: Many similarly titled clones have since appeared, such as Gravity Force XNA, Gravity Jam, Gravity Power 2, Gravity Force, Gravity Strike, Gravity Fight, Gravity Wars, Gravastar, and Galaxy Forces V2. These games are generally freeware, unfinished and refer to themselves as "Gravity Force clones", rather than "Thrust-clones".

text: Many similarly titled

text: clones

text: have since appeared, such as Gravity Force XNA, Gravity Jam, Gravity Power 2, Gravity Force, Gravity Strike, Gravity Fight, Gravity Wars, Gravastar, and Galaxy Forces V2. These games are generally freeware, unfinished and refer to themselves as "Gravity Force clones", rather than "Thrust-clones".

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answers: Gravity Force

answers: NDQ_017290

answers: Gravity Force

text: The force of gravity on the surface of the Earth, normally denoted g, has remained constant in both direction and magnitude since the formation of the planet. As a result, both plant and animal life have evolved to rely upon and cope with it in various ways.

text: The force of gravity on the surface of the Earth, normally denoted

text: g

text: , has remained constant in both direction and magnitude since the formation of the planet. As a result, both

text: plant

text: and

text: animal

text: life have evolved to rely upon and cope with it in various ways.

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answers: It acts only between objects that are touching.

answers: NDQ_017283

answers: magnitude

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answers: Earth

answers: NDQ_017286

answers: Yes

answers: NDQ_017290

answers: Gravity

text: Gravity measurements are a reflection of the earth’s gravitational attraction, its centripetal force, tidal accelerations due to the sun, moon, and planets, and other applied forces. Gravity gradiometers measure the spatial derivatives of the gravity vector. The most frequently used and intuitive component is the vertical gravity gradient, G, which represents the rate of change of vertical gravity (g) with height (z). It can be deduced by differencing the value of gravity at two points separated by a small vertical distance, l, and dividing by this distance.

text: Gravity measurements are a reflection of the earth’s gravitational attraction, its

text: centripetal force

text: tidal accelerations

text: due to the sun, moon, and planets, and other applied forces. Gravity gradiometers measure the spatial derivatives of the gravity vector. The most frequently used and intuitive component is the vertical gravity gradient, G, which represents the rate of change of vertical gravity (g) with height (z). It can be deduced by differencing the value of gravity at two points separated by a small vertical distance, l, and dividing by this distance.

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answers: Gravity acts only between objects that are touching.

answers: NDQ_017283

answers: distance

answers: NDQ_017284

answers: sun

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity

text: Both arguments are based on pure gravity and quantum theory, and they limit the measurement of timeby the only time constant in pure quantum gravity, the Planck time.Our instruments, however, are not purely gravitational but are made of particles. They may set a more severe, larger, limit than the Planck time.

text: Both arguments are based on pure gravity and quantum theory, and they limit the measurement of timeby the only time constant in pure

text: quantum gravity

text: , the

text: Planck time

text: .Our instruments, however, are not purely gravitational but are made of particles. They may set a more severe, larger, limit than the Planck time.

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text: In his earlier book Three Roads to Quantum Gravity (2002), Smolin stated that loop quantum gravity and string theory were essentially the same concept seen from different perspectives. In that book, he also favored the holographic principle. The Trouble with Physics, on the other hand, was strongly critical of the prominence of string theory in contemporary theoretical physics, which he believes has suppressed research in other promising approaches. Smolin suggests that string theory suffers from serious deficiencies and has an unhealthy near-monopoly in the particle theory community. He called for a diversity of approaches to quantum gravity, and argued that more attention should be paid to loop quantum gravity, an approach Smolin has devised. Finally, The Trouble with Physics is also broadly concerned with the role of controversy and the value of diverse approaches in the ethics and process of science.

text: In his earlier book

text: Three Roads to Quantum Gravity

text: (2002), Smolin stated that

text: loop quantum gravity

text: and string theory were essentially the same concept seen from different perspectives. In that book, he also favored the

text: holographic principle

text: . The Trouble with Physics, on the other hand, was strongly critical of the prominence of string theory in contemporary theoretical physics, which he believes has suppressed research in other promising approaches. Smolin suggests that string theory suffers from serious deficiencies and has an unhealthy near-monopoly in the particle theory community. He called for a diversity of approaches to

text: quantum gravity

text: , and argued that more attention should be paid to loop quantum gravity, an approach Smolin has devised. Finally, The Trouble with Physics is also broadly concerned with the role of controversy and the value of diverse approaches in the ethics and process of science.

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answers: Smolin

text: The common distribution of a flame under normal gravity conditions depends on convection, as soot tends to rise to the top of a general flame, as in a candle in normal gravity conditions, making it yellow. In micro gravity or zero gravity, such as an environment in outer space, convection no longer occurs, and the flame becomes spherical, with a tendency to become more blue and more efficient (although it may go out if not moved steadily, as the CO from combustion does not disperse as readily in micro gravity, and tends to smother the flame). There are several possible explanations for this difference, of which the most likely is that the temperature is sufficiently evenly distributed that soot is not formed and complete combustion occurs. Experiments by NASA reveal that diffusion flames in micro gravity allow more soot to be completely oxidized after they are produced than diffusion flames on Earth, because of a series of mechanisms that behave differently in micro gravity when compared to normal gravity conditions. These discoveries have potential applications in applied science and industry, especially concerning fuel efficiency.

text: The common distribution of a flame under normal gravity conditions depends on

text: convection

text: , as soot tends to rise to the top of a general flame, as in a

text: candle

text: in normal gravity conditions, making it yellow. In

text: micro gravity or zero gravity

text: , such as an environment in

text: outer space

text: , convection no longer occurs, and the flame becomes spherical, with a tendency to become more blue and more efficient (although it may go out if not moved steadily, as the CO from combustion does not disperse as readily in micro gravity, and tends to smother the flame). There are several possible explanations for this difference, of which the most likely is that the temperature is sufficiently evenly distributed that soot is not formed and complete combustion occurs. Experiments by

text: NASA

text: reveal that

text: diffusion flame

text: s in micro gravity allow more soot to be completely oxidized after they are produced than diffusion flames on Earth, because of a series of mechanisms that behave differently in micro gravity when compared to normal gravity conditions. These discoveries have potential applications in

text: applied science

text: and

text: industry

text: , especially concerning

text: fuel efficiency

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answers: Gravity

text: The gravitational gradient of the Earth, that is, the change in the gravitational acceleration vector from one point on the Earth’s surface to another, is customarily measured in units of eotvos. The Earth's gravity gradient is dominated by the component due to Earth's near-spherical shape, which results in a vertical tensile gravity gradient of 3,080 E (an elevation increase of 1 m gives a decrease of gravity of about 0.3 mGal), and horizontal compressive gravity gradients of 1/2 that, or 1,540 E. Earth’s rotation perturbs this in a direction-dependent manner by about 5 E. Gravity gradient anomalies in mountainous areas can be as large as several hundred E.

text: The

text: gravitational gradient

text: of the Earth, that is, the change in the gravitational acceleration vector from one point on the Earth’s surface to another, is customarily measured in units of eotvos. The Earth's gravity gradient is dominated by the component due to Earth's near-spherical shape, which results in a vertical tensile gravity gradient of 3,080 E (an elevation increase of 1

text: m

text: gives a decrease of gravity of about 0.3 mGal), and horizontal compressive gravity gradients of 1/2 that, or 1,540 E. Earth’s rotation perturbs this in a direction-dependent manner by about 5 E. Gravity gradient anomalies in mountainous areas can be as large as several hundred E.

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answers: Gravity

text: Since its creation, ELGRA has continuously encouraged and promoted low gravity research in both life and physical sciences within Europe with the permanent support of the European Space Agency. For several years ELGRA was a study group of the Parliamentary Assembly of the Council of Europe and contributed to a better visibility of Low Gravity research at the highest European spheres. However, its main action remains the improvement of the scientific collaboration between scientists from all over Europe in the field of low gravity research. In that effort, ELGRA has organized meetings and symposia resulting in 2011 in the 22nd ELGRA symposium held in Antwerp (Belgium) which gathered more than 150 scientists from all over the world. ELGRA also supports young researchers and students via grants and educational programs from ESA. In 2012, the ELGRA community counts not less than 200 active members. The success of ELGRA reflects the increasing interest of the European scientific community for low gravity.  Since the 80s, ELGRA's scientists have been using new research facilities either on the ground, as the 133m drop tower at ZARM (Bremem, Germany) or centrifuges (ESTEC, DLR, MEDES), but also in space with the European Columbus module aboard the International Space Station dedicated to low gravity research. Nowadays, low gravity space research involves more and more scientists from all over Europe and space experiments require more preparation and especially a strong collaboration between the different partners. A collaboration platform dedicated to low gravity research as ELGRA remains crucial to facilitate this collaboration. Additionally, ELGRA joins both Physical as well as Life Sciences, what enhances translational research.

text: Since its creation, ELGRA has continuously encouraged and promoted low gravity research in both life and physical sciences within Europe with the permanent support of the European Space Agency. For several years ELGRA was a study group of the Parliamentary Assembly of the Council of Europe and contributed to a better visibility of Low Gravity research at the highest European spheres. However, its main action remains the improvement of the scientific collaboration between scientists from all over Europe in the field of low gravity research. In that effort, ELGRA has organized meetings and symposia resulting in 2011 in the 22nd ELGRA symposium held in Antwerp (Belgium) which gathered more than 150 scientists from all over the world. ELGRA also supports young researchers and students via grants and educational programs from

text: ESA

text: . In 2012, the ELGRA community counts not less than 200 active members. The success of ELGRA reflects the increasing interest of the European scientific community for low gravity.  Since the 80s, ELGRA's scientists have been using new research facilities either on the ground, as the 133m drop tower at ZARM (Bremem, Germany) or centrifuges (

entity_name: European Space Research and Technology Centre

text: ESTEC

text: DLR

text: , MEDES), but also in space with the European Columbus module aboard the International Space Station dedicated to low gravity research. Nowadays, low gravity space research involves more and more scientists from all over Europe and space experiments require more preparation and especially a strong collaboration between the different partners. A collaboration platform dedicated to low gravity research as ELGRA remains crucial to facilitate this collaboration. Additionally, ELGRA joins both Physical as well as Life Sciences, what enhances translational research.

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answers: 2: The answer has limited relevance and completeness, with significant gaps or inaccuracies.

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answers: gravity acts only between objects that are touching

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answers: 133m drop tower

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answers: Gravity

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answers: Gravity

text: The strength of the gravitational field is numerically equal to the acceleration of objects under its influence.  The rate of acceleration of falling objects near the Earth's surface varies very slightly depending on latitude, surface features such as mountains and ridges, and perhaps unusually high or low sub-surface densities. For purposes of weights and measures, a standard gravity value is defined by the International Bureau of Weights and Measures, under the International System of Units (SI).

text: The strength of the gravitational field is numerically equal to the acceleration of objects under its influence.  The rate of acceleration of falling objects near the Earth's surface varies very slightly depending on latitude, surface features such as mountains and ridges, and perhaps unusually high or low sub-surface densities. For purposes of weights and measures, a

text: standard gravity

text: value is defined by the

text: International Bureau of Weights and Measures

text: , under the

text: International System of Units

text: (SI).

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answers: It acts only between objects that are touching.

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answers: NDQ_017290

answers: For purposes of weights and measures

text: Now, since an even number of equal weights, equally spaced, have their centre of gravity between the two middle weights, A is in fact applied at E, and B at D, as the proposition requires. Further, the total system consists of an even number of equal weights equally distributed, and, therefore, following the same law, C must be the centre of gravity of the full system. Thus A applied at E, and B applied at D, have their centre of gravity at C.

text: Now, since an even number of equal weights, equally spaced, have their centre of gravity between the two middle weights, A is in fact applied at E, and B at D, as the proposition requires. Further, the total system consists of an even number of equal weights equally distributed, and, therefore, following the same law, C must be the centre of gravity of the full system. Thus A applied at E, and B applied at D, have their centre of gravity at C.

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answers: It acts only between objects that are touching.

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answers: centre of gravity

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answers: C

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: centre of gravity between the two middle weights

text: Assume for the moment that gravity was not at work.  In that case, the dart would proceed in a straight-line trajectory at a constant speed (Newton's first law).  Gravity causes the dart to fall away from this straight-line path, making a trajectory that is in fact a parabola.  Now, consider what happens if the hunter aims directly at the monkey, and the monkey releases his grip the instant the hunter fires.  Because the force of gravity accelerates the dart and the monkey equally, they fall the same distance in the same time:  the monkey falls from the tree branch, and the dart falls the same distance from the straight-line path it would have taken in the absence of gravity.  Therefore, the dart will always hit the monkey, no matter the initial speed of the dart.

text: Assume for the moment that gravity was not at work.  In that case, the dart would proceed in a straight-line trajectory at a constant speed (

text: Newton's first law

text: ).  Gravity causes the dart to fall away from this straight-line path, making a trajectory that is in fact a

text: parabola

text: .  Now, consider what happens if the hunter aims directly at the monkey, and the monkey releases his grip the instant the hunter fires.  Because the force of gravity accelerates the dart and the monkey equally, they fall the same distance in the same time:  the monkey falls from the tree branch, and the dart falls the same distance from the straight-line path it would have taken in the absence of gravity.  Therefore, the dart will always hit the monkey, no matter the initial speed of the dart.

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text: To prevent some of the effects associated with weightlessness, a treadmill with vibration isolation and stabilization designed for the International Space Station (ISS) was first evaluated during STS-81. Three crew members ran and walked on the device, which floats freely in the micro-gravity experienced during orbit. For the majority of the more than 2 hours of locomotion studied, the treadmill operated well, and vibration transmitted to the vehicle was within the micro-gravity allocation limits that are defined for the ISS. Refinements to the treadmill and harness system, which ultimately led to development of the COLBERT model, were studied after this first flight. One goal of the treadmill design is to offer the possibility of generating 1 g-like loads on the lower extremities while preserving the micro-gravity environment of the ISS for structural safety and vibration free experimental conditions.

text: To prevent some of the effects associated with weightlessness, a treadmill with vibration isolation and stabilization designed for the International Space Station (ISS) was first evaluated during

text: . Three crew members ran and walked on the device, which floats freely in the

text: micro-gravity

text: experienced during orbit. For the majority of the more than 2 hours of locomotion studied, the treadmill operated well, and vibration transmitted to the vehicle was within the micro-gravity allocation limits that are defined for the

text: ISS

text: . Refinements to the treadmill and harness system, which ultimately led to development of the COLBERT model, were studied after this first flight. One goal of the treadmill design is to offer the possibility of generating

text: 1 g

text: -like loads on the lower extremities while preserving the micro-gravity environment of the ISS for structural safety and vibration free experimental conditions.

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text: Although the symbol  is sometimes used for standard gravity,  (without a suffix) can also mean the local acceleration due to local gravity and centrifugal acceleration, which varies depending on one's position on Earth (see Earth's gravity). The symbol  should not be confused with , the gravitational constant, or g, the symbol for gram. The  is also used as a unit for any form of acceleration, with the value defined as above; see g-force.

text: Although the symbol  is sometimes used for standard gravity,  (without a suffix) can also mean the local acceleration due to local gravity and centrifugal acceleration, which varies depending on one's position on Earth (see

text: Earth's gravity

text: ). The symbol  should not be confused with , the

text: gravitational constant

text: , or g, the symbol for

text: gram

text: . The  is also used as a unit for any form of

text: acceleration

text: , with the value defined as above; see

text: g-force

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answers: It acts only between objects that are touching.

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text: Several research groups have attempted to combine LQG with other research programs: Johannes Aastrup, Jesper M. Grimstrup et al. research combines noncommutative geometry with loop quantum gravity, Laurent Freidel, Simone Speziale, et al., spinors and twistor theory with loop quantum gravity, and Lee Smolin et al. with Verlinde entropic gravity and loop gravity. Stephon Alexander, Antonino Marciano and Lee Smolin have attempted to explain the origins of weak force chirality in terms of Ashketar's variables, which describe gravity as chiral, and LQG with Yang–Mills theory fields in four dimensions. Sundance Bilson-Thompson, Hackett et al., has attempted to introduce standard model via LQG"s degrees of freedom as an emergent property (by employing the idea noiseless subsystems a useful notion introduced in more general situation for constrained systems by Fotini Markopoulou-Kalamara et al.) LQG has also drawn philosophical comparisons with causal dynamical triangulation and asymptotically safe gravity, and the spinfoam with group field theory and AdS/CFT correspondence. Smolin and Wen have suggested combining LQG with String-net liquid, tensors, and Smolin and Fotini Markopoulou-Kalamara Quantum Graphity. There is the consistent discretizations approach. Also, Pullin and Gambini provide a framework to connect the path integral and canonical approaches to quantum gravity. They may help reconcile the spin foam and canonical loop representation approaches. Recent research by Chris Duston and Matilde Marcolli introduces topology change via topspin networks.

text: Several research groups have attempted to combine LQG with other research programs: Johannes Aastrup, Jesper M. Grimstrup et al. research combines

text: noncommutative geometry

text: with loop quantum gravity, Laurent Freidel, Simone Speziale, et al.,

text: spinors

text: and

text: twistor theory

text: with loop quantum gravity, and Lee Smolin et al. with Verlinde

text: entropic gravity

text: and loop gravity. Stephon Alexander, Antonino Marciano and Lee Smolin have attempted to explain the origins of

text: weak force

text: chirality in terms of Ashketar's variables, which describe gravity as chiral, and LQG with

text: Yang–Mills theory

text: fields in four dimensions.

text: Sundance Bilson-Thompson

text: , Hackett et al., has attempted to introduce standard model via LQG"s degrees of freedom as an emergent property (by employing the idea

text: noiseless subsystems

text: a useful notion introduced in more general situation for constrained systems by

text: Fotini Markopoulou-Kalamara

text: et al.) LQG has also drawn philosophical comparisons with

text: causal dynamical triangulation

text: and

text: asymptotically safe gravity

text: , and the spinfoam with

text: group field theory

text: and

text: AdS/CFT correspondence

text: . Smolin and Wen have suggested combining LQG with

text: String-net liquid

text: tensors

text: , and Smolin and Fotini Markopoulou-Kalamara

text: Quantum Graphity

text: . There is the consistent discretizations approach. Also, Pullin and

text: Gambini

text: provide a framework to connect the

text: path integral

text: and canonical approaches to quantum gravity. They may help reconcile the spin foam and canonical loop representation approaches. Recent research by Chris Duston and

text: Matilde Marcolli

text: introduces

text: topology change

text: via topspin networks.

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text: In a gravity dam, the force that holds the dam in place against the push from the water is Earth's gravity pulling down on the mass of the dam. The water presses laterally (downstream) on the dam, tending to overturn the dam by rotating about its toe (a point at the bottom downstream side of the dam). The dam's weight counteracts that force, tending to rotate the dam the other way about its toe. The designer ensures that the dam is heavy enough that the dam's weight wins that contest. In engineering terms, that is true whenever the resultant of the forces of gravity acting on the dam and water pressure on the dam acts in a line that passes upstream of the toe of the dam.

text: In a gravity dam, the force that holds the dam in place against the push from the water is Earth's gravity pulling down on the mass of the dam. The water presses laterally (downstream) on the dam, tending to overturn the dam by rotating about its toe (a point at the bottom downstream side of the dam). The dam's weight counteracts that force, tending to rotate the dam the other way about its toe. The designer ensures that the dam is heavy enough that the dam's weight wins that contest. In engineering terms, that is true whenever the

text: resultant

text: of the forces of gravity acting on the dam and water pressure on the dam acts in a line that passes upstream of the toe of the dam.

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text: American interest in "gravity control propulsion research" intensified during the early 1950s.  Literature from that period used the terms anti-gravity, anti-gravitation, baricentric, counterbary, electrogravitics (eGrav), G-projects, gravitics, gravity control, and gravity propulsion.  Their publicized goals were to develop and discover technologies and theories for the manipulation of gravity or gravity-like fields for propulsion. Although general relativity theory appeared to prohibit anti-gravity propulsion, several programs were funded to develop it through gravitation research from 1955 to 1974.  The names of many contributors to general relativity and those of the golden age of general relativity have appeared among documents about the institutions that had served as the theoretical research components of those programs.  The existence and 1950s emergence of the gravity control propulsion research have not been a subject of controversy for aerospace writers, critics, and conspiracy theory advocates, but their rationale, effectiveness, and longevity have been the objects of contested views.

text: American interest in "gravity control propulsion research" intensified during the early 1950s.  Literature from that period used the terms anti-gravity, anti-gravitation, baricentric, counterbary, electrogravitics (eGrav), G-projects, gravitics, gravity control, and gravity propulsion.  Their publicized goals were to develop and discover

text: technologies

text: and theories for the manipulation of

text: gravity

text: or gravity-like fields for propulsion. Although

text: general relativity

text: theory appeared to prohibit

text: anti-gravity

text: propulsion, several programs were funded to develop it through gravitation research from 1955 to 1974.  The names of many

entity_name: List of contributors to general relativity

text: contributors to general relativity

text: and those of the

text: golden age of general relativity

text: have appeared among documents about the institutions that had served as the theoretical research components of those programs.  The existence and 1950s emergence of the gravity control propulsion research have not been a subject of controversy for

text: aerospace

text: writers, critics, and

text: conspiracy theory

text: advocates, but their rationale, effectiveness, and longevity have been the objects of contested views.

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answers: Gravity or gravity-like fields

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answers: Gravity

text: When asked what sets Gravity apart from his previous releases, Lecrae stated that "Obviously, there's more risk involved in terms of just making more mature music that's not as straight [and] explicit. it's dealing with bigger issues. People may have to think a little bit more. The production is a lot bigger and more advanced than it's been. Lyrically, as an artist, I think I've written some of the best lyrics I've ever written." Lecrae provided insight into the album's concept during an interview with Family Christian, stating that "Gravity is loosely based on Ecclesiastes and I think what Solomon was trying to do was bring some weight to life and that’s really what I want to do, to paint some sober pictures." He described that "there’s a sober picture of how it’s only for a short period of time, it’s short-lived, or that we still have Jesus. So that’s what I would call a weighty part, a gravitational pull to remind us of who we are in Jesus." Billboard stated that Lecrae increased his level of production for Gravity and "mixed reggae and soul influences with his signature brash sound." AllHipHop described the album as opening with "an influx of instruments like violin, drums, guitars". "I Know" was described as having one of the hardest beats on the album, while "Mayday" was considered one of the most "organic" sounding tracks. "Violence" was considered one of the most energetic tracks, and was described as "caribbean-esque" with a dancehall vibe. After the music video for "Lord Have Mercy" was released, an article in The Christian Post article compared the song to the Kanye West single "Mercy", both in its title and musical style. The article elaborated that "like Kanye West's song, "'Lord Have Mercy' features slowed down sampled vocals for its chorus along with heavy bass and an overall dark tone." It noted the appearance of No Malice in the video, stating that "the chorus seems to sample his voice."

text: When asked what sets Gravity apart from his previous releases, Lecrae stated that "Obviously, there's more risk involved in terms of just making more mature music that's not as straight [and] explicit. it's dealing with bigger issues. People may have to think a little bit more. The production is a lot bigger and more advanced than it's been. Lyrically, as an artist, I think I've written some of the best lyrics I've ever written." Lecrae provided insight into the album's concept during an interview with

text: Family Christian

text: , stating that "Gravity is loosely based on

text: Ecclesiastes

text: and I think what

text: Solomon

text: was trying to do was bring some weight to life and that’s really what I want to do, to paint some sober pictures." He described that "there’s a sober picture of how it’s only for a short period of time, it’s short-lived, or that we still have Jesus. So that’s what I would call a weighty part, a gravitational pull to remind us of who we are in Jesus." Billboard stated that Lecrae increased his level of production for Gravity and "mixed

text: reggae

text: and

text: soul

text: influences with his signature brash sound." AllHipHop described the album as opening with "an influx of instruments like

text: violin

text: drum

text: s,

text: guitar

text: s". "I Know" was described as having one of the hardest beats on the album, while "Mayday" was considered one of the most "organic" sounding tracks. "Violence" was considered one of the most energetic tracks, and was described as "

text: caribbean

text: -esque" with a

text: dancehall

text: vibe. After the music video for "Lord Have Mercy" was released, an article in

text: The Christian Post

text: article compared the song to the

text: Kanye West

text: single "

text: Mercy

text: ", both in its title and musical style. The article elaborated that "like Kanye West's song, "'Lord Have Mercy' features slowed down

text: sampled

text: vocals for its chorus along with heavy bass and an overall dark tone." It noted the appearance of No Malice in the video, stating that "the chorus seems to sample his voice."

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answers: Gravity acts only between objects that are touching.

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answers: Gravity is loosely based on Ecclesiastes

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answers: Gravity is loosely based on Ecclesiastes and I think what Solomon was trying to do was bring some weight to life

text: In 1988, Carlo Rovelli, Lee Smolin, and Abhay Ashtekar introduced a theory of quantum gravity called loop quantum gravity.  In 1995, Rovelli and Smolin obtained a basis of states of quantum gravity, labelled by Penrose's spin networks, and using this basis they were able to show that the theory predicts that area and volume are quantized. This result indicates the existence of a discrete structure of space at very small scale. In 1997, Rovelli and Michael Reisenberger introduced a "sum over surfaces" formulation of theory, which has since evolved into the currently covariant "spinfoam" version of loop quantum gravity. In 2008, in collaboration with Jonathan Engle and Roberto Pereira, he has introduced the spin foam vertex amplitude which is the basis of the current definition of the loop quantum gravity covariant dynamics.  The loop theory is today considered a candidate for a quantum theory of gravity. It finds applications in quantum cosmology, spinfoam cosmology, and quantum black hole physics.

text: In 1988, Carlo Rovelli,

text: Lee Smolin

text: , and

text: Abhay Ashtekar

text: introduced a theory of quantum gravity called

text: loop quantum gravity

text: .  In 1995, Rovelli and Smolin obtained a basis of states of quantum gravity, labelled by

text: Penrose

text: 's

text: spin network

text: s, and using this basis they were able to show that the theory predicts that area and volume are quantized. This result indicates the existence of a discrete structure of space at very small scale. In 1997, Rovelli and Michael Reisenberger introduced a "sum over surfaces" formulation of theory, which has since evolved into the currently covariant "

text: spinfoam

text: " version of loop quantum gravity. In 2008, in collaboration with Jonathan Engle and Roberto Pereira, he has introduced the spin foam vertex amplitude which is the basis of the current definition of the loop quantum gravity covariant dynamics.  The loop theory is today considered a candidate for a

text: quantum theory of gravity

text: . It finds applications in

text: quantum cosmology

text: , spinfoam cosmology, and quantum

text: black hole

text: physics.

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answers: It finds applications in quantum cosmology

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answers: quantum gravity

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answers: Penrose

text: The north Atlantic is characterized by strong, large-scale anomalies of the gravity field and the geoid. The geoid rises up to 70 m above the geodetic reference ellipsoid in an approximately circular area with a diameter of several hundred kilometers. In the context of the plume hypothesis, this has been explained by the dynamic effect of the upwelling plume which bulges up the surface of the Earth. Furthermore, the plume and the thickened crust cause a positive gravity anomaly of about 60 mGal (=0.0006 m/s²) (free-air).

text: The north Atlantic is characterized by strong, large-scale anomalies of the

text: gravity

text: field and the

text: geoid

text: . The geoid rises up to 70 m above the geodetic reference ellipsoid in an approximately circular area with a diameter of several hundred kilometers. In the context of the plume hypothesis, this has been explained by the dynamic effect of the upwelling plume which bulges up the surface of the Earth. Furthermore, the plume and the thickened crust cause a positive gravity anomaly of about 60

text: mGal

text: (=0.0006 m/s²) (free-air).

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answers: Gravity acts only between objects that are touching

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answers: Gravity

text: Surface Gravity: 149% of Earth

text: Surface Gravity: 149% of Earth

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answers: 2: The answer has limited relevance and completeness, with noticeable gaps or inaccuracies.

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answers: Gravity acts only between objects that are touching.

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answers: surface area

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answers: Earth

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: Now that we are familiar with the concepts of gravity and tensors, a qualitative discussion of gravity and its significance in geophysical analysis can be done. A certain mass distribution creates a gravitational force field around it, In other words, the object under consideration has a finite mass ‘M’ and hence bends the space around it. The gravitational field gradient is given by the divergence of the gravitational field.

text: Now that we are familiar with the concepts of gravity and tensors, a qualitative discussion of gravity and its significance in geophysical analysis can be done. A certain mass distribution creates a gravitational force field around it, In other words, the object under consideration has a finite mass ‘M’ and hence bends the space around it. The gravitational field gradient is given by the divergence of the gravitational field.

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answers: It acts only between objects that are touching

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answers: Yes

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answers: mass

text: The precise strength of Earth's gravity varies depending on location. The nominal "average" value at the Earth's surface, known as  is, by definition, 9.80665 m/s (about 32.1740 ft/s). This quantity is denoted variously as ,  (though this sometimes means the normal equatorial value on Earth, 9.78033 m/s), , gee, or simply  (which is also used for the variable local value).

text: The precise strength of Earth's gravity varies depending on location. The nominal "average" value at the Earth's surface, known as  is, by definition, 9.80665 m/s (about 32.1740 ft/s). This quantity is denoted variously as ,  (though this sometimes means the normal equatorial value on Earth, 9.78033 m/s), , gee, or simply  (which is also used for the variable local value).

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answers: Gravity

text: where OG is the original gravity, or the specific gravity before fermentation and FG is the final gravity or SG after fermentation.

text: where OG is the original gravity, or the specific gravity before fermentation and FG is the final gravity or SG after fermentation.

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text: Mass is not the same as weight, even though we often calculate an object's mass by measuring its weight with a spring scale, rather than comparing it directly with known masses. An object on the Moon would weigh less than it does on Earth because of the lower gravity, but it would still have the same mass. This is because weight is a force, while mass is the property that (along with gravity) determines the strength of this force.

text: Mass is not the same as

text: weight

text: , even though we often calculate an object's mass by measuring its weight with a

text: spring scale

text: , rather than

text: comparing it directly with known masses

text: . An object on the Moon would weigh less than it does on Earth because of the lower gravity, but it would still have the same mass. This is because weight is a force, while mass is the property that (along with gravity) determines the strength of this force.

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answers: Gravity acts only between objects that are touching

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answers: Earth

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answers: NDQ_017290

answers: spring scale

text: In June 2002 a user named Jeff Stubbs posted a draft of a letter to the editor that mentions "intelligent grappling" to the alt.atheism and talk.origins usenet groups. He commented that "I don't like the theory of gravity, I feel personally insulted that engineers design structures only considering physical mass. What about our souls? I propose that science classes also teach the theory of "Intelligent Grappling". There's no way a weak force such as gravity can possibly hold everything onto the planet. It must be God,  using our souls, to hold everything together." This was followed by Elf Sternberg posting a "FAQ on intelligent grappling" on the sci.skeptic usenet group. D. C. Simpson published, in May 2005, an I Drew This comic strip titled "Teaching Gravity". Intelligent falling was the subject of an article in The Onion in August 2005.

text: In June 2002 a user named Jeff Stubbs posted a draft of a letter to the editor that mentions "intelligent grappling" to the alt.atheism and talk.origins usenet groups. He commented that "I don't like the theory of gravity, I feel personally insulted that engineers design structures only considering physical mass. What about our souls? I propose that science classes also teach the theory of "Intelligent Grappling". There's no way a weak force such as gravity can possibly hold everything onto the planet.

text: It must be God

text: ,  using our souls, to hold everything together." This was followed by

text: Elf Sternberg

text: posting a "FAQ on intelligent grappling" on the sci.skeptic usenet group.

text: D. C. Simpson

text: published, in May 2005, an

text: I Drew This

text: comic strip titled "Teaching Gravity". Intelligent falling was the subject of an article in

text: The Onion

text: in August 2005.

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answers: It must be God, using our souls, to hold everything together

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answers: There's no way a weak force

answers: NDQ_017290

answers: physical mass

text: Rainbow gravity (or "gravity's rainbow") is a theory that different wavelengths of light experience different gravity levels and are separated in the same way that a prism splits white light into the rainbow. This phenomenon would be imperceptible in areas of relatively low gravity, such as Earth, but would be significant in areas of extremely high gravity, such as a black hole. As such the theory claims to disprove that the universe has a beginning or Big Bang, as the big bang theory calls for all wavelengths of light to be impacted by gravity to the same extent. The theory was first proposed in 2003 by physicists Lee Smolin and João Magueijo, and claims to bridge the gap between general relativity and quantum mechanics. Scientists are currently attempting to detect rainbow gravity using the Large Hadron Collider.

text: Rainbow gravity (or "gravity's rainbow") is a theory that different wavelengths of light experience different

text: gravity

text: levels and are separated in the same way that a

text: prism

text: splits white light into the rainbow. This phenomenon would be imperceptible in areas of relatively low gravity, such as Earth, but would be significant in areas of extremely high gravity, such as a

text: black hole

text: . As such the theory claims to disprove that the

text: universe

text: has a beginning or

text: Big Bang

text: , as the big bang theory calls for all wavelengths of light to be impacted by gravity to the same extent. The theory was first proposed in 2003 by physicists

text: Lee Smolin

text: and

text: João Magueijo

text: , and claims to bridge the gap between general relativity and quantum mechanics. Scientists are currently attempting to detect rainbow gravity using the

text: Large Hadron Collider

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answers: This phenomenon would be imperceptible in areas of relatively low gravity

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answers: NDQ_017290

answers: Gravity

text: Having formulated the relativistic, geometric version of the effects of gravity, the question of gravity's source remains. In Newtonian gravity, the source is mass. In special relativity, mass turns out to be part of a more general quantity called the energy–momentum tensor, which includes both energy and momentum densities as well as stress (that is, pressure and shear). Using the equivalence principle, this tensor is readily generalized to curved space-time. Drawing further upon the analogy with geometric Newtonian gravity, it is natural to assume that the field equation for gravity relates this tensor and the Ricci tensor, which describes a particular class of tidal effects: the change in volume for a small cloud of test particles that are initially at rest, and then fall freely. In special relativity, conservation of energy–momentum corresponds to the statement that the energy–momentum tensor is divergence-free. This formula, too, is readily generalized to curved spacetime by replacing partial derivatives with their curved-manifold counterparts, covariant derivatives studied in differential geometry. With this additional condition—the covariant divergence of the energy–momentum tensor, and hence of whatever is on the other side of the equation, is zero— the simplest set of equations are what are called Einstein's (field) equations:

text: Having formulated the relativistic, geometric version of the effects of gravity, the question of gravity's source remains. In Newtonian gravity, the source is mass. In special relativity, mass turns out to be part of a more general quantity called the

text: energy–momentum tensor

text: , which includes both

text: energy

text: and

text: momentum

text: densities

text: as well as

text: stress

text: (that is,

text: pressure

text: and shear). Using the equivalence principle, this tensor is readily generalized to curved space-time. Drawing further upon the analogy with geometric Newtonian gravity, it is natural to assume that the

text: field equation

text: for gravity relates this tensor and the

text: Ricci tensor

text: , which describes a particular class of tidal effects: the change in volume for a small cloud of test particles that are initially at rest, and then fall freely. In special relativity,

text: conservation of energy

text: –momentum corresponds to the statement that the energy–momentum tensor is

text: divergence

text: -free. This formula, too, is readily generalized to curved spacetime by replacing partial derivatives with their curved-

text: manifold

text: counterparts,

text: covariant derivative

text: s studied in

text: differential geometry

text: . With this additional condition—the covariant divergence of the energy–momentum tensor, and hence of whatever is on the other side of the equation, is zero— the simplest set of equations are what are called Einstein's (field) equations:

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answers: Newtonian gravity, the source is mass

answers: NDQ_017283

answers: mass

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answers: cloud of test particles

answers: NDQ_017286

answers: In Newtonian gravity, the source is mass

answers: NDQ_017290

answers: Newtonian gravity

text: At some point up the cable, the two terms (downward gravity and upward centrifugal force) are equal and opposite. Objects fixed to the cable at that point put no weight on the cable. This altitude (r) depends on the mass of the planet and its rotation rate. Setting actual gravity equal to centrifugal acceleration gives:

text: At some point up the cable, the two terms (downward gravity and upward centrifugal force) are equal and opposite. Objects fixed to the cable at that point put no weight on the cable. This altitude (r) depends on the mass of the planet and its rotation rate. Setting actual gravity equal to centrifugal acceleration gives:

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answers: 2: The answer has limited relevance and completeness, with noticeable gaps or inaccuracies.

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answers: Gravity

text: This episode documents how gravity has a profound effect across the universe, and Cox seeks out a non-space zero-gravity experience to highlight his point. From the formation of galaxies and stars to the patterns of uplift and erosion seen on Earth, gravity is centrally important. Examples are given, such as the tidal force that captured and locked our moon over time, or more massively in the projected collision between the Andromeda and Milky Way Galaxies. Cox then enters a high-G training centrifuge to show how on Earth, gravity is a relatively weak force, but elsewhere in the Universe it is significantly stronger. In Chaco Culture National Historical Park he refers to Carl Sagan's Cosmos, and its link to a 3-week long supernova in 1054. The almost unimaginable crushing gravitational power of the Crab Pulsar is then contrasted to the distance of an atom's nucleus to its orbiting electrons. Finally, there is a look back at how Einstein's research on gravity has enabled us to better understand how gravity actually works within both "the falling valley" of spacetime and the "event horizon" of black holes.

text: This episode documents how

text: gravity

text: has a profound effect across the universe, and Cox seeks out a non-space

text: zero-gravity experience

text: to highlight his point. From the formation of galaxies and stars to the patterns of uplift and erosion seen on Earth, gravity is centrally important. Examples are given, such as the

text: tidal force

text: that

text: captured and locked

text: our moon over time, or more massively in the

text: projected collision

text: between the

text: Andromeda

text: and

text: Milky Way

text: Galaxies. Cox then enters a

text: high-G training

text: centrifuge to show how on Earth, gravity is a relatively weak force, but elsewhere in the Universe it is

text: significantly stronger

text: . In

text: Chaco Culture National Historical Park

text: he refers to

text: Carl Sagan's

text: Cosmos

text: , and its link to

text: a 3-week long supernova in 1054

text: . The almost unimaginable crushing gravitational power of the

text: Crab Pulsar

text: is then contrasted to the distance of an atom's nucleus to its orbiting electrons. Finally, there is a look back at how

text: Einstein's research on gravity

text: has enabled us to better understand how gravity actually works within both "the falling valley" of

text: spacetime

text: and the "event horizon" of

text: black holes

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answers: Gravity

text: The seed of what became Lost Gravity was sown two years earlier, in 2005, when Breno relocated to Hamburg for a few months to write some songs. Some of these songs became the core of Lost Gravity current setlist like Anywhere But Home and No Way Out. Other songs which were written later, Selfish and Venom in a Vial, were inspired by his time in Germany.

text: The seed of what became Lost Gravity was sown two years earlier, in 2005, when Breno relocated to

text: Hamburg

text: for a few months to write some songs. Some of these songs became the core of Lost Gravity current setlist like Anywhere But Home and No Way Out. Other songs which were written later, Selfish and Venom in a Vial, were inspired by his time in Germany.

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answers: NDQ_017290

answers: gravity

text: In early February 1945 the positions of the centre of gravity for the A1 operational machine during its flight profile were giving the RLM and the SS cause for concern. They wanted these figures to be decided upon for the upcoming construction of the A1 aircraft for Krokus-Einsatz (Operation Crocus), the field deployment of the Natter. The position of the centre of gravity is expressed as a percentage of the chord (distance between the leading and trailing edges) of the main wing. Thus 0% is the leading edge and 100% is the trailing edge. In the manned glider trials the centre of gravity had been varied between 20 and 34%. At a meeting of engineers held on 8 February, the variations in the centre of gravity expected in the A1 Krokus machine were discussed. At take-off with the weight of the four solid boosters, the centre of gravity would be brought back to 65%, but after releasing these rockets it would move forwards to 22%. The free flight by Zübert on 14 February had showed unequivocally that the little Natter had excellent flying characteristics as a glider. The centre of gravity problem was solved initially by the addition of one-metre-square auxiliary tailfins that were released simultaneously with the jettisoning of the boosters. The Krokus aircraft had vanes that would direct the Walter rocket exhaust gases so as to assist vehicle stabilisation at low speed similar to those used in the V-2 rocket.

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answers: Thus 0% is the leading edge and 100% is the trailing edge

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answers: distance

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answers: Gravity

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answers: centre of gravity

text: In modern scientific usage, weight and mass are fundamentally different quantities: mass is an "extrinsic" (extensive) property of matter, whereas weight is a force that results from the action of gravity on matter: it measures how strongly the force of gravity pulls on that matter. However, in most practical everyday situations the word "weight" is used when, strictly, "mass" is meant. For example, most people would say that an object "weighs one kilogram", even though the kilogram is a unit of mass.

text: In modern scientific usage, weight and

text: mass

text: are fundamentally different quantities: mass is an "extrinsic" (

text: extensive

text: ) property of

text: matter

text: , whereas weight is a force that results from the action of

text: gravity

text: on matter: it measures how strongly the force of gravity pulls on that matter. However, in most practical everyday situations the word "weight" is used when, strictly, "mass" is meant. For example, most people would say that an object "weighs one kilogram", even though the kilogram is a unit of mass.

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answers: how strongly the force of gravity pulls

text: It has proven difficult to construct quantum models of gravity, the remaining fundamental force. Semi-classical approximations are workable, and have led to predictions such as Hawking radiation. However, the formulation of a complete theory of quantum gravity is hindered by apparent incompatibilities between general relativity (the most accurate theory of gravity currently known) and some of the fundamental assumptions of quantum theory. The resolution of these incompatibilities is an area of active research, and theories such as string theory are among the possible candidates for a future theory of quantum gravity.

text: It has proven difficult to construct quantum models of

text: gravity

text: , the remaining

text: fundamental force

text: . Semi-classical approximations are workable, and have led to predictions such as

text: Hawking radiation

text: . However, the formulation of a complete theory of

text: quantum gravity

text: is hindered by apparent incompatibilities between

text: general relativity

text: (the most accurate theory of gravity currently known) and some of the fundamental assumptions of quantum theory. The resolution of these incompatibilities is an area of active research, and theories such as

text: string theory

text: are among the possible candidates for a future theory of quantum gravity.

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answers: Gravity acts only between objects that are touching

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answers: Gravity

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answers: Gravity

text: Gravity also acts at a distance, without an apparent energy source, but to get energy out of a gravitational field (for instance, by dropping a heavy object, producing kinetic energy as it falls) one has to put energy in (for instance, by lifting the object up), and some energy is always dissipated in the process. A typical application of gravity in a perpetual motion machine is Bhaskara's wheel in the 12th century, whose key idea is itself a recurring theme, often called the overbalanced wheel: moving weights are attached to a wheel in such a way that they fall to a position further from the wheel's center for one half of the wheel's rotation, and closer to the center for the other half. Since weights further from the center apply a greater torque, it was thought that the wheel would rotate forever. However, since the side with weights further from the center has fewer weights than the other side, at that moment, the torque is balanced and perpetual movement is not achieved. The moving weights may be hammers on pivoted arms, or rolling balls, or mercury in tubes; the principle is the same.

text: Gravity

text: also acts at a distance, without an apparent energy source, but to get energy out of a gravitational field (for instance, by dropping a heavy object, producing kinetic energy as it falls) one has to put energy in (for instance, by lifting the object up), and some energy is always dissipated in the process. A typical application of gravity in a perpetual motion machine is

text: Bhaskara

text: 's wheel in the 12th century, whose key idea is itself a recurring theme, often called the overbalanced wheel: moving weights are attached to a wheel in such a way that they fall to a position further from the wheel's center for one half of the wheel's rotation, and closer to the center for the other half. Since weights further from the center apply a greater

text: torque

text: , it was thought that the wheel would rotate forever. However, since the side with weights further from the center has fewer weights than the other side, at that moment, the torque is balanced and perpetual movement is not achieved. The moving weights may be hammers on pivoted arms, or rolling balls, or mercury in tubes; the principle is the same.

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answers: Gravity

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text: Gravity assists include:<ref name='Gravity Assist'></ref>

text: Gravity assists include:<ref name='Gravity Assist'></ref>

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answers: Gravity Assist

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answers: Gravity Assist

text: An instrument used to measure gravity is known as a gravimeter, or gravitometer. Since general relativity regards the effects of gravity as indistinguishable from the effects of acceleration, one can regard gravimeters as special-purpose accelerometers.  Many weighing scales may be regarded as simple gravimeters. In one common form, a spring is used to counteract the force of gravity pulling on an object. The change in length of the spring may be calibrated to the force required to balance the gravitational pull. The resulting measurement may be made in units of force (such as the newton), but is more commonly made in units of gals.

text: An instrument used to measure gravity is known as a

text: gravimeter

text: , or gravitometer. Since

text: general relativity

text: regards the effects of gravity as indistinguishable from the effects of

text: acceleration

text: , one can regard gravimeters as special-purpose

text: accelerometer

text: s.  Many

text: weighing scale

text: s may be regarded as simple gravimeters. In one common form, a

text: spring

text: is used to counteract the force of gravity pulling on an object. The change in length of the spring may be calibrated to the force required to balance the gravitational pull. The resulting measurement may be made in units of force (such as the

text: newton

text: ), but is more commonly made in units of

text: gal

text: s.

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answers: Many weighing scales

text: Sparse gravity data shows a negative anomaly (an area of lower gravity) in the area of the impact structure. However, there are other negative gravity anomalies nearby which are not believed to be related to the impact event. In addition, there are less dense felsic rocks in the western shore of the lake, which can contribute to the gravity low. The anomaly will be mapped in a much greater detail to determine if it is related to the impact event.

text: Sparse gravity data shows a negative anomaly (an area of lower

text: gravity

text: ) in the area of the impact structure. However, there are other negative gravity anomalies nearby which are not believed to be related to the impact event. In addition, there are less dense

text: felsic

text: rocks in the western shore of the lake, which can contribute to the gravity low. The anomaly will be mapped in a much greater detail to determine if it is related to the impact event.

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answers: It acts only between objects that are touching

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: Oil gravity and sulfur content is similar in all pools in the field, with an API gravity of 29-30 and approximately 1 percent sulfur by weight.

text: Oil gravity and sulfur content is similar in all pools in the field, with an

text: API gravity

text: of 29-30 and approximately 1 percent sulfur by weight.

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answers: 2: The answer has limited relevance and completeness, with significant gaps or inaccuracies.

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answers: weight

text: Genji is a Super-Earth but only moderately so: it has 2.8 times the mass and 1.36 times the diameter of Earth, and 1.5 times Earth's gravity. The side of the planet that constantly faces its companion world Chujo (“Moonside”) is mostly land, the other hemisphere (“Starside”) is mostly ocean. The mean surface temperature is +20 °C, slightly warmer than Earth. Although humans in good condition can physically accommodate to the high gravity, the sea level air pressure of 3.1 bars which results from this gravity (as per the barometric formula) requires artificial decompression for safe breathing. Only at 5,800 meters (an altitude found on this planet only in the form of a few small highlands that are cold and arid) the atmospheric pressure drops to Earth-standard 1 bar.

text: Genji is a

text: Super-Earth

text: but only moderately so: it has 2.8 times the mass and 1.36 times the diameter of Earth, and 1.5 times

text: Earth's gravity

text: . The side of the planet that constantly faces its companion world Chujo (“Moonside”) is mostly land, the other hemisphere (“Starside”) is mostly ocean. The mean surface temperature is +20 °C, slightly warmer than Earth. Although humans in good condition can physically accommodate to the high gravity, the sea level air pressure of 3.1 bars which results from this gravity (as per the

text: barometric formula

text: ) requires artificial decompression for

text: safe breathing

text: . Only at 5,800 meters (an altitude found on this planet only in the form of a few small highlands that are cold and arid) the atmospheric pressure drops to Earth-standard 1 bar.

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: The experimental determination of the center of mass of a body uses gravity forces on the body and relies on the fact that in the parallel gravity field near the surface of the earth the center of mass is the same as the center of gravity.

text: The experimental determination of the center of mass of a body uses gravity forces on the body and relies on the fact that in the parallel gravity field near the surface of the earth the center of mass is the same as the center of gravity.

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answers: Gravity forces on the body

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answers: Yes

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answers: center of mass

text: Depending on which features of general relativity and quantum theory are accepted unchanged, and on what level changes are introduced, there are numerous other attempts to arrive at a viable theory of quantum gravity, some examples being the lattice theory of gravity based on the Feynman Path Integral approach and Regge Calculus, dynamical triangulations, causal sets, twistor models or the path-integral based models of quantum cosmology.

text: Depending on which features of general relativity and quantum theory are accepted unchanged, and on what level changes are introduced, there are numerous other attempts to arrive at a viable theory of quantum gravity, some examples being the lattice theory of gravity based on the Feynman

text: Path Integral

text: approach and

text: Regge Calculus

text: dynamical triangulation

text: s,

text: causal sets

text: twistor

text: models or the

text: path-integral

text: based models of

text: quantum cosmology

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answers: NDQ_017290

answers: Gravity

text: By selecting the center of gravity as the reference point for a rigid body, the gravity forces will not cause the body to rotate, which means the weight of the body can be considered to be concentrated at the center of mass.

text: By selecting the center of gravity as the reference point for a rigid body, the gravity forces will not cause the body to rotate, which means the weight of the body can be considered to be concentrated at the center of mass.

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answers: It acts between objects that are touching

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answers: center of mass

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answers: Gravity

answers: NDQ_017290

answers: center of mass

text: In physics, apparent weight is a property of objects that corresponds to how heavy an object is. The apparent weight of an object will differ from the weight of an object whenever the force of gravity acting on the object is not balanced by an equal but opposite normal force. By definition, the weight of an object is equal to the magnitude of the force of gravity acting on it. This means that even a "weightless" astronaut in low Earth orbit has almost the same weight as he would have while standing on the ground.

text: In

text: physics

text: , apparent weight is a property of objects that corresponds to how heavy an object is. The apparent weight of an object will differ from the

text: weight

text: of an object whenever the force of gravity acting on the object is not balanced by an equal but opposite normal force. By definition, the weight of an object is equal to the magnitude of the force of gravity acting on it. This means that even a "

text: weightless

text: " astronaut in low Earth orbit has almost the same weight as he would have while standing on the ground.

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answers: It does not.

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answers: By definition, the weight of an object is equal to the magnitude of the force of gravity acting on it

answers: NDQ_017290

answers: weight of an object is equal to the magnitude of the force of gravity acting on it

text: Gravity and the nature of the watt balance, which oscillates test masses up and down against the local gravitational acceleration g, are exploited so that mechanical power is compared against electrical power, which is the square of voltage divided by electrical resistance. However, g varies significantly—by nearly 1%—depending on where on the Earth's surface the measurement is made (see Earth's gravity). There are also slight seasonal variations in g due to changes in underground water tables, and larger semimonthly and diurnal changes due to tidal distortions in the Earth's shape caused by the Moon. Although g would not be a term in the definition of the kilogram, it would be crucial in the delineation of the kilogram when relating energy to power. Accordingly, g must be measured with at least as much precision and accuracy as are the other terms, so measurements of g must also be traceable to fundamental constants of nature. For the most precise work in mass metrology, g is measured using dropping-mass absolute gravimeters that contain an iodine-stabilized helium–neon laser interferometer. The fringe-signal, frequency-sweep output from the interferometer is measured with a rubidium atomic clock. Since this type of dropping-mass gravimeter derives its accuracy and stability from the constancy of the speed of light as well as the innate properties of helium, neon, and rubidium atoms, the 'gravity' term in the delineation of an all-electronic kilogram is also measured in terms of invariants of nature—and with very high precision. For instance, in the basement of the NIST's Gaithersburg facility in 2009, when measuring the gravity acting upon Pt10Ir test masses (which are denser, smaller, and have a slightly lower center of gravity inside the watt balance than stainless steel masses), the measured value was typically within 8 ppb of .

text: Gravity and the nature of the watt balance, which oscillates test masses up and down against the local gravitational acceleration g, are exploited so that mechanical power is compared against electrical power, which is the square of voltage divided by electrical resistance. However, g varies significantly—by nearly 1%—depending on where on the Earth's surface the measurement is made (see

text: Earth's gravity

text: ). There are also slight seasonal variations in g due to changes in underground water tables, and larger semimonthly and diurnal changes due to tidal distortions in the Earth's shape caused by the Moon. Although g would not be a term in the definition of the kilogram, it would be crucial in the delineation of the kilogram when relating energy to power. Accordingly, g must be measured with at least as much precision and accuracy as are the other terms, so measurements of g must also be traceable to fundamental constants of nature. For the most precise work in mass metrology, g is measured using dropping-mass absolute

text: gravimeter

text: s that contain an iodine-stabilized

text: helium–neon laser

text: interferometer

text: . The

text: fringe-signal

text: frequency-sweep

text: output from the interferometer is measured with a rubidium

text: atomic clock

text: . Since this type of dropping-mass gravimeter derives its accuracy and stability from the constancy of the speed of light as well as the innate properties of helium, neon, and rubidium atoms, the 'gravity' term in the delineation of an all-electronic kilogram is also measured in terms of invariants of nature—and with very high precision. For instance, in the basement of the NIST's Gaithersburg facility in 2009, when measuring the gravity acting upon Pt10Ir test masses (which are denser, smaller, and have a slightly lower center of gravity inside the watt balance than stainless steel masses), the measured value was typically within 8 ppb of .

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answers: stainless steel masses

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answers: Gravity

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answers: watt balance

text: For geophysical applications, gravity is distinguished from gravitation. Gravity is defined as the resultant of gravitation and the centrifugal force caused by the Earth's rotation. The global mean sea surface is close to one of the equipotential surfaces of the geopotential of gravity

text: For

text: geophysical

text: applications, gravity is distinguished from gravitation. Gravity is defined as the resultant of

text: gravitation

text: and the

text: centrifugal force

text: caused by the

text: Earth's rotation

text: . The

text: global mean sea surface

text: is close to one of the equipotential surfaces of the geopotential of gravity

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answers: Gravity acts only between objects that are touching

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answers: Earth

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: In the usual case we will have measured weights and want the true specific gravity. This is found from

text: In the usual case we will have measured weights and want the true specific gravity. This is found from

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answers: 0: The answer is not relevant or complete at all.

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answers: Gravity is a force

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answers: measured weights

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answers: Gravity

answers: NDQ_017290

answers: weights

text: Surface gravity is measured in units of acceleration, which, in the SI system, are meters per second squared. It may also be expressed as a multiple of the Earth's standard surface gravity, g = 9.80665 m/s. In astrophysics, the surface gravity may be expressed as log g, which is obtained by first expressing the gravity in cgs units, where the unit of acceleration is centimeters per second squared, and then taking the base-10 logarithm. Therefore, the surface gravity of Earth could be expressed in cgs units as 980.665 cm/s, with a base-10 logarithm (log g) of 2.992.

text: Surface gravity is measured in units of

text: acceleration

text: , which, in the

text: SI

text: system, are

text: meters per second squared

text: . It may also be expressed as a multiple of the

text: Earth

text: 's

text: standard surface gravity

text: , g = 9.80665 m/s. In

text: astrophysics

text: , the surface gravity may be expressed as log g, which is obtained by first expressing the gravity in

text: cgs unit

text: s, where the unit of acceleration is

text: centimeter

text: s per second squared, and then taking the base-10

text: logarithm

text: . Therefore, the surface gravity of Earth could be expressed in cgs units as 980.665 cm/s, with a base-10 logarithm (log g) of 2.992.

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answers: Surface gravity is measured in units of acceleration

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answers: Gravity

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answers: Gravity

text: The theory of quantum field theory in curved spacetime can be considered as a first approximation to quantum gravity. A second step towards that theory would be semiclassical gravity, which would include the influence of particles created by a strong gravitational field on the spacetime (which is still considered classical and the equivalence principle still holds). However gravity is not renormalizable in QFT, so merely formulating QFT in curved spacetime is not a theory of quantum gravity.

text: The theory of quantum field theory in curved spacetime can be considered as a first approximation to

text: quantum gravity

text: . A second step towards that theory would be

text: semiclassical gravity

text: , which would include the influence of particles created by a strong gravitational field on the spacetime (which is still considered classical and the equivalence principle still holds). However gravity is not

text: renormalizable

text: in QFT, so merely formulating QFT in curved spacetime is not a theory of quantum gravity.

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answers: Gravity acts only between objects that are touching

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answers: Gravity

text: Smolin is best known for his contributions to quantum gravity theory, in particular the approach known as loop quantum gravity. He advocates that the two primary approaches to quantum gravity, loop quantum gravity and string theory, can be reconciled as different aspects of the same underlying theory. His research interests also include cosmology, elementary particle theory, the foundations of quantum mechanics, and theoretical biology.

text: Smolin is best known for his contributions to

text: quantum gravity

text: theory, in particular the approach known as

text: loop quantum gravity

text: . He advocates that the two primary approaches to quantum gravity, loop quantum gravity and

text: string theory

text: , can be reconciled as different aspects of the same underlying theory. His research interests also include

text: cosmology

text: elementary particle

text: theory, the foundations of

text: quantum mechanics

text: , and

text: theoretical biology

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answers: Smolin

text: In geodesy and geophysics, theoretical gravity or normal gravity is an approximation of the true effective or apparent gravity on Earth's surface by means of a mathematical model representing (a physically smoothed) Earth. The most common model of a smoothed Earth is an Earth ellipsoid, or, more specifically, an Earth spheroid (i.e., an ellipsoid of revolution).

text: In

text: geodesy

text: and

text: geophysics

text: , theoretical gravity or normal gravity is an approximation of the true effective or apparent gravity on

text: Earth

text: 's surface by means of a

text: mathematical model

text: representing (a physically smoothed) Earth. The most common model of a smoothed Earth is an

text: Earth ellipsoid

text: , or, more specifically, an Earth

text: spheroid

text: (i.e., an ellipsoid of revolution).

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text: In common usage, the mass of an object is often referred to as its weight, though these are in fact different concepts and quantities. In scientific contexts, mass refers loosely to the amount of "matter" in an object (though "matter" may be difficult to define), whereas weight refers to the force exerted on an object by gravity. In other words, an object with a mass of 1.0 kilogram will weigh approximately 9.81 newtons on the surface of the Earth (its mass multiplied by the gravitational field strength).

text: In common usage, the

text: mass

text: of an object is often referred to as its

text: weight

text: , though these are in fact different concepts and quantities. In scientific contexts, mass refers loosely to the amount of "

text: matter

text: " in an object (though "matter" may be difficult to define), whereas weight refers to the

text: force

text: exerted on an object by

text: gravity

text: . In other words, an object with a mass of 1.0 kilogram will weigh approximately 9.81 newtons on the surface of the

text: Earth

text: (its mass multiplied by the

text: gravitational field strength

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answers: mass multiplied by the gravitational field strength

text: In a July 2012 interview with Japanese gaming magazine Famitsu game director Keichiro Toyama expressed interest in developing a sequel to Gravity Rush. After receiving the Tokyo Game Show 2012 Game of the Year award, and receiving congratulations from fans Toyama said, "I'll do my best on the sequel". A sequel has been teased during Tokyo Game Show 2013. The short teaser trailer showed a vast vertical floating city (as opposed to the original's horizontal floating city), improved graphics and possible adversaries or allies. The main protagonist seems to still be Kat. Also Kat's lower arms seem to glow with what seems to be the same gravity energy she displayed within her body when manipulating gravity.

text: In a July 2012 interview with Japanese gaming magazine

text: Famitsu

text: game director Keichiro Toyama expressed interest in developing a sequel to Gravity Rush. After receiving the Tokyo Game Show 2012 Game of the Year award, and receiving congratulations from fans Toyama said, "I'll do my best on the sequel". A sequel has been teased during Tokyo Game Show 2013. The short teaser trailer showed a vast vertical floating city (as opposed to the original's horizontal floating city), improved graphics and possible adversaries or allies. The main protagonist seems to still be Kat. Also Kat's lower arms seem to glow with what seems to be the same gravity energy she displayed within her body when manipulating gravity.

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answers: Gravity

text: At the core of the problem, according to Levine, is our lack of understanding of what it means for a qualitative experience to be fully comprehended. He emphasizes that we don't even know to what extent it is appropriate to inquire into the nature of this kind of experience. He uses the laws of gravity as an example, which laws seem to explain gravity completely yet do not account for the gravitational constant. Similarly to the way in which gravity appears to be an inexplicable brute fact of nature, the case of qualia may be one in which we are either lacking essential information or in which we're exploring a natural phenomenon that simply is not further apprehensible. Levine suggests that, as qualitative experience of a physical or functional state may simply be such a brute fact, perhaps we should consider whether or not it is really necessary to find a more complete explanation of qualitative experience.

text: At the core of the problem, according to Levine, is our lack of understanding of what it means for a qualitative experience to be fully comprehended. He emphasizes that we don't even know to what extent it is appropriate to inquire into the nature of this kind of experience. He uses the laws of gravity as an example, which laws seem to explain gravity completely yet do not account for the gravitational constant. Similarly to the way in which gravity appears to be an inexplicable brute fact of nature, the case of qualia may be one in which we are either lacking essential information or in which we're exploring a natural phenomenon that simply is not further apprehensible. Levine suggests that, as qualitative experience of a physical or functional state may simply be such a brute fact, perhaps we should consider whether or not it is really necessary to find a more complete explanation of qualitative experience.

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text: Dvali is best known for the ADD model, which he proposed together with Nima Arkani-Hamed and Savas Dimopoulos in 1998. It is a scenario inspired by string theory to explain the relative weakness of gravity to other forces, in which the Standard Model fields are confined to a (3+1)-dimensional membrane but gravity can also propagate in additional transverse spatial dimensions that are compact but may be as large as one-tenth of a millimeter. In this framework quantum gravity, string theory, and black holes may be experimentally investigated at the Large Hadron Collider.

text: Dvali is best known for the

text: ADD model

text: , which he proposed together with

text: Nima Arkani-Hamed

text: and

text: Savas Dimopoulos

text: in 1998. It is a scenario inspired by

text: string theory

text: to explain the relative weakness of gravity to other forces, in which the

text: Standard Model

text: fields are confined to a (3+1)-dimensional membrane but gravity can also propagate in additional transverse spatial dimensions that are compact but may be as large as one-tenth of a millimeter. In this framework

text: quantum gravity

text: , string theory, and

text: black holes

text: may be experimentally investigated at the

text: Large Hadron Collider

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text: Accelerometers have multiple applications in industry and science. Highly sensitive accelerometers are components of inertial navigation systems for aircraft and missiles. Accelerometers are used to detect and monitor vibration in rotating machinery. Accelerometers are used in tablet computers and digital cameras so that images on screens are always displayed upright. Accelerometers are used in drones for flight stabilisation. Coordinated accelerometers can be used to measure differences in proper acceleration, particularly gravity, over their separation in space; i.e., gradient of the gravitational field. This gravity gradiometry is useful because absolute gravity is a weak effect and depends on local density of the Earth which is quite variable.

text: Accelerometers have multiple applications in industry and science. Highly sensitive accelerometers are components of

text: inertial navigation system

text: s for aircraft and missiles. Accelerometers are used to detect and monitor vibration in rotating machinery. Accelerometers are used in

text: tablet computer

text: s and digital cameras so that images on screens are always displayed upright. Accelerometers are used in drones for flight stabilisation. Coordinated accelerometers can be used to measure differences in proper acceleration, particularly gravity, over their separation in space; i.e., gradient of the

text: gravitational field

text: . This

text: gravity gradiometry

text: is useful because absolute gravity is a weak effect and depends on local density of the Earth which is quite variable.

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answers: It depends on local density of the Earth

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answers: Gravity

text: Self-gravity has important implications in the field of seismology as well because the Earth is large enough that it can have elastic waves that are large enough to change the gravity within the Earth as the waves interact with large scale subsurface structures. There are models made that depend on the use of the spectral element method and these simulations take into account the effects of self-gravitation because it can have a large influence on results for certain receiver-source configurations and creates complications in the wave equation, particularly for long period waves. This kind of accuracy is critical in developing accurate 3-D crustal models in a spherical body (Earth) in the field of seismology, which allows for more accurate and higher quality interpretations to be drawn from data. The influence of self-gravity (and gravity) alters the importance of Primary (P) and Secondary (S) waves in seismology because when gravity is not taken into account, the S wave becomes more dominant and as gravity is taken into account, the effects of the S wave become less significant.

text: Self-gravity has important implications in the field of seismology as well because the Earth is large enough that it can have

text: elastic waves

text: that are large enough to change the gravity within the Earth as the waves interact with large scale subsurface structures. There are models made that depend on the use of the

text: spectral element method

text: and these simulations take into account the effects of self-gravitation because it can have a large influence on results for certain receiver-source configurations and creates complications in the

text: wave equation

text: , particularly for long

text: period

text: waves. This kind of accuracy is critical in developing accurate 3-D crustal models in a spherical body (Earth) in the field of seismology, which allows for more accurate and higher quality interpretations to be drawn from data. The influence of self-gravity (and gravity) alters the importance of

text: Primary (P) and Secondary (S) waves

text: in seismology because when gravity is not taken into account, the S wave becomes more dominant and as gravity is taken into account, the effects of the S wave become less significant.

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: Since gravity is inversely proportional to the square of the distance, a space station 400 km above the Earth feels almost the same gravitational force as we do on the Earth's surface. The reason a space station does not plummet to the ground is not that it is not subject to gravity, but that it is in a free-fall orbit.

text: Since gravity is inversely proportional to the square of the distance, a space station 400 km above the Earth feels almost the same gravitational force as we do on the Earth's surface. The reason a space station does not plummet to the ground is not that it is not subject to

text: gravity

text: , but that it is in a

text: free-fall

text: orbit

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answers: Gravity acts only between objects that are touching

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answers: Earth's surface

answers: NDQ_017290

answers: Gravity

text: The type of gravity model used for the Earth depends upon the degree of fidelity required for a given problem.  For many problems such as aircraft simulation, it may be sufficient to consider gravity to be a constant, defined as:

text: The type of gravity model used for the Earth depends upon the degree of fidelity required for a given problem.  For many problems such as aircraft simulation, it may be sufficient to consider gravity to be a constant, defined as:

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answers: It acts only between objects that are touching

answers: NDQ_017283

answers: degree of fidelity

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answers: Earth

answers: NDQ_017286

answers: gravity

answers: NDQ_017290

answers: gravity

text: Effective gravity on the Earth's surface varies by around 0.7%, from 9.7639 m/s on the Nevado Huascarán mountain in Peru to 9.8337 m/s at the surface of the Arctic Ocean. In large cities, it ranges from 9.766 in Kuala Lumpur, Mexico City, and Singapore to 9.825 in Oslo and Helsinki.

text: Effective gravity on the Earth's surface varies by around 0.7%, from 9.7639 m/s on the

text: Nevado Huascarán

text: mountain in Peru to 9.8337 m/s at the surface of the

text: Arctic Ocean

entity_section: Comparative gravities in various cities around the world

text: In large cities, it ranges

text: from 9.766 in

text: Kuala Lumpur

text: Mexico City

text: , and

text: Singapore

text: to 9.825 in

text: Oslo

text: and

text: Helsinki

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answers: Effective gravity

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answers: Arctic Ocean

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answers: Effective gravity

answers: NDQ_017290

answers: Effective gravity

text: Large-scale gravity anomalies can be detected from space, as a by-product of satellite gravity missions, e.g., GOCE. These satellite missions aim at the recovery of a detailed gravity field model of the Earth, typically presented in the form of a spherical-harmonic expansion of the Earth's gravitational potential, but alternative presentations, such as maps of geoid undulations or gravity anomalies, are also produced.

text: Large-scale gravity anomalies can be detected from space, as a by-product of satellite gravity missions, e.g.,

text: GOCE

text: . These satellite missions aim at the recovery of a detailed gravity field model of the Earth, typically presented in the form of a

text: spherical-harmonic

text: expansion of the Earth's gravitational potential, but alternative presentations, such as maps of geoid undulations or gravity anomalies, are also produced.

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answers: It does not

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answers: Earth

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: An approximate value for gravity at a distance  from the centre of the Earth can be obtained by assuming that the Earth's density is spherically symmetric. The gravity depends only on the mass inside the sphere of radius . All the contributions from outside cancel out as a consequence of the inverse-square law of gravitation. Another consequence is that the gravity is the same as if all the mass were concentrated at the centre. Thus, the gravitational acceleration at this radius is

text: An approximate value for gravity at a distance  from the centre of the Earth can be obtained by assuming that the Earth's density is spherically symmetric. The gravity depends only on the mass inside the sphere of radius . All the contributions from outside cancel out as a consequence of the

text: inverse-square law

text: of gravitation. Another consequence is that the gravity is the same as if all the mass were concentrated at the centre. Thus, the gravitational acceleration at this radius is

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text: Some motors are powered by potential or kinetic energy, for example some funiculars, gravity plane and ropeway conveyors have used the energy from moving water or rocks, and some clocks have a weight that falls under gravity. Other forms of potential energy include compressed gases (such as pneumatic motors), springs (clockwork motors) and elastic bands.

text: Some motors are powered by potential or kinetic energy, for example some

text: funicular

text: s,

text: gravity plane

text: and

text: ropeway conveyor

text: s have used the energy from moving water or rocks, and some clocks have a weight that falls under gravity. Other forms of potential energy include compressed gases (such as

text: pneumatic motor

text: s), springs (

text: clockwork motor

text: s) and

text: elastic band

text: s.

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text: It is referred to as "heavy" because its density or specific gravity is higher than that of light crude oil. Heavy crude oil has been defined as any liquid petroleum with an API gravity less than 20°. Physical properties that differ between heavy crude oils and lighter grades include higher viscosity and specific gravity, as well as heavier molecular composition.  In 2010, the World Energy Council defined extra heavy oil as crude oil having a gravity of less than 10° and a reservoir viscosity of no more than 10,000 centipoises. When reservoir viscosity measurements are not available, extra-heavy oil is considered by the WEC to have a lower limit of 4° °API. (i.e. with density greater than 1000 kg/m or, equivalently, a specific gravity greater than 1 and a reservoir viscosity of no more than 10,000 centipoises. Heavy oils and asphalt are dense nonaqueous phase liquids (DNAPLs). They have a "low solubility and are with viscosity lower and density higher than water. "Large spills of DNAPL will quickly penetrate the full depth of the aquifer and accumulate on its bottom."

text: It is referred to as "heavy" because its

text: density

text: or

text: specific gravity

text: is higher than that of

text: light crude oil

text: . Heavy crude oil has been defined as any liquid petroleum with an

text: API gravity

text: less than 20°. Physical properties that differ between heavy crude oils and lighter grades include higher

text: viscosity

text: and

text: specific gravity

text: , as well as heavier molecular composition.  In 2010, the

text: World Energy Council

text: defined extra heavy oil as crude oil having a gravity of less than 10° and a reservoir viscosity of no more than 10,000 centipoises. When reservoir viscosity measurements are not available, extra-heavy oil is considered by the WEC to have a lower limit of 4° °API. (i.e. with density greater than 1000 kg/m or, equivalently, a specific gravity greater than 1 and a reservoir viscosity of no more than 10,000

text: centipoise

text: s. Heavy oils and asphalt are

text: dense nonaqueous phase liquids

text: (DNAPLs). They have a "low solubility and are with viscosity lower and density higher than water. "Large spills of DNAPL will quickly penetrate the full depth of the aquifer and accumulate on its bottom."

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text: Although it had been known since antiquity that the Earth was spherical, by the 17th century evidence was accumulating that it was not a perfect sphere.   In 1672 Jean Richer found the first evidence that gravity was not constant over the Earth; he took a pendulum clock to Cayenne, French Guiana and found that it lost  minutes per day compared to its rate at Paris.  This indicated the acceleration of gravity was less at Cayenne than at Paris.  Pendulum gravimeters began to be taken on voyages to remote parts of the world, and it was slowly discovered that gravity increases smoothly with increasing latitude, gravitational acceleration being about 0.5% greater at the poles than at the equator.

text: Although it had been known since antiquity that the Earth was spherical, by the 17th century evidence was accumulating that it was not a perfect sphere.   In 1672

text: Jean Richer

text: found the first evidence that gravity was not constant over the Earth; he took a

text: pendulum clock

text: to

text: Cayenne

text: French Guiana

text: and found that it lost  minutes per day compared to its rate at Paris.  This indicated the

text: acceleration of gravity

text: was less at Cayenne than at Paris.  Pendulum gravimeters began to be taken on voyages to remote parts of the world, and it was slowly discovered that gravity increases smoothly with increasing latitude, gravitational acceleration being about 0.5% greater at the poles than at the equator.

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answers: Gravimeters

text: The physics engine is often admired for its simulation of realism as well as its accurate depiction of gravity and aerodynamics, going so far as to include distance, hang time and even weight in its gravity parabola.

text: The physics engine is often admired for its simulation of realism as well as its accurate depiction of gravity and aerodynamics, going so far as to include distance, hang time and even weight in its gravity parabola.

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text: In 2002, Lee Smolin suggested that the Kodama state is a ground state which has a good semiclassical limit which reproduces the dynamics of general relativity with a positive (de Sitter) cosmological constant, 4 dimensions, and gravitons. It is an exact solution to ordinary constraints on background independent quantum gravity, providing evidence that loop quantum gravity is indeed a quantum gravity with the correct semiclassical description.  In 2003, Edward Witten published a paper in response to Lee Smolin's, arguing that the Kodama state is unphysical, due to an analogy to a state in Chern–Simons theory wave functions, resulting in negative energies. In 2006, Andrew Randono  published two papers which address these objections, by generalizing the Kodama state. Randono concluded that the Immirzi parameter, when generalized with a real value, fixed by matching with black hole entropy, describes parity violation in quantum gravity, and is CPT invariant, and is normalizable, and chiral, consistent with known observations of both gravity and quantum field theory. Randono claims that Witten's conclusions rest on the Immirzi parameter taking on an imaginary number, which simplifies the equation. The physical inner product may resemble the MacDowell–Mansouri action formulation of gravity.

text: In 2002,

text: Lee Smolin

text: suggested that the Kodama state is a

text: ground state

text: which has a good semiclassical limit which reproduces the dynamics of

text: general relativity

text: with a positive (de Sitter)

text: cosmological constant

text: , 4 dimensions, and

text: gravitons

text: . It is an exact solution to ordinary constraints on

text: background independent

text: quantum gravity, providing evidence that

text: loop quantum gravity

text: is indeed a quantum gravity with the correct semiclassical description.  In 2003,

text: Edward Witten

text: published a paper in response to Lee Smolin's, arguing that the Kodama state is unphysical, due to an analogy to a state in

text: Chern–Simons theory

text: wave function

text: s, resulting in negative energies. In 2006, Andrew Randono  published two papers which address these objections, by generalizing the Kodama state. Randono concluded that the

text: Immirzi parameter

text: , when generalized with a real value, fixed by matching with

text: black hole entropy

text: , describes

text: parity violation

text: in quantum gravity, and is

text: CPT

text: invariant, and is normalizable, and

text: chiral

text: , consistent with known observations of both gravity and quantum field theory. Randono claims that Witten's conclusions rest on the

text: Immirzi parameter

text: taking on an

text: imaginary number

text: , which simplifies the equation. The physical

text: inner product

text: may resemble the

text: MacDowell–Mansouri action

text: formulation of gravity.

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answers: Lee Smolin

text: The justification for two separate braking systems is that, compared to cars, a motorcycle has, proportionately, a higher centre of gravity, a shorter wheelbase, a higher power-to-weight ratio, and a smaller tyre contact patch area. All these factors lead to a much greater weight transfer to the front wheel on braking, and a greater risk of skidding. A rider needs to be able to use each brake independently to maintain control, and a CBS system seeks to further reduce any skid risk.

text: The justification for two separate braking systems is that, compared to cars, a motorcycle has, proportionately, a higher centre of gravity, a shorter wheelbase, a higher power-to-weight ratio, and a smaller tyre contact patch area. All these factors lead to a much greater weight transfer to the front wheel on braking, and a greater risk of skidding. A rider needs to be able to use each brake independently to maintain control, and a CBS system seeks to further reduce any skid risk.

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text: The vertical deflection (deflection of the plumb line, astro-geodetic deflection) at a point on the Earth is a measure of how far the direction of the local gravity field has been shifted by local anomalies such as nearby mountains. (Here "gravity" means apparent gravity—true gravity "reduced" by the earth's spin). They are widely used in geodesy, for surveying networks and for geophysical purposes.

text: The vertical deflection (deflection of the

text: plumb line

text: , astro-geodetic deflection) at a point on the Earth is a measure of how far the direction of the local

text: gravity field

text: has been shifted by local anomalies such as nearby mountains. (Here "gravity" means apparent gravity—true gravity "reduced" by the earth's spin). They are widely used in

text: geodesy

text: , for

text: surveying

text: networks and for geophysical purposes.

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answers: The vertical deflection

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answers: mountains

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answers: Gravity

answers: NDQ_017290

answers: weight is measured with a balance

text: In the Dome, Bigman challenges Urteil to a fight in Mercurian gravity.  Dr. Cook reduces the artificial gravity in the Dome's power room to Mercurian levels to accommodate them; but during the fight, the gravity suddenly returns to Earth-normal, and Urteil dies in a fall.

text: In the Dome, Bigman challenges Urteil to a fight in Mercurian

text: gravity

text: .  Dr. Cook reduces the

text: artificial gravity

text: in the Dome's power room to Mercurian levels to accommodate them; but during the fight, the gravity suddenly returns to Earth-normal, and Urteil dies in a fall.

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text: is the value of the acceleration of gravity at the equator, m the ratio of the centrifugal force to gravity at the equator, and f the flattening of a meridian section of the earth, defined as:

text: is the value of the acceleration of gravity at the equator, m the ratio of the centrifugal force to gravity at the equator, and f the

text: flattening

text: of a

text: meridian

text: section of the earth, defined as:

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text: Gravity is a function of mass. While the average value of Earth's surface gravity is approximately 9.8 meters per second squared, given sufficiently sensitive instrumentation, it is possible to detect local variations in gravity from the different densities of natural materials: the value of gravity will be greater on top of a granite monolith than over a sand beach. Again with sufficiently sensitive instrumentation, it should be possible to detect gravitational differences between solid rock, and rock excavated for a hidden facility.

text: Gravity is a function of mass. While the average value of Earth's surface gravity is approximately 9.8 meters per second squared, given sufficiently sensitive instrumentation, it is possible to detect local variations in gravity from the different densities of natural materials: the value of gravity will be greater on top of a granite monolith than over a sand beach. Again with sufficiently sensitive instrumentation, it should be possible to detect gravitational differences between solid rock, and rock excavated for a hidden facility.

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answers: It is possible to detect local variations in gravity

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answers: Gravity

text: Again, unlike the effect that low-gravity environments have on weight, buoyancy does not make a portion of an object’s weight vanish; the missing weight is instead being borne by the ground, which leaves less force (weight) being applied to any scale theoretically placed underneath the object in question (though one may perhaps have some trouble with the practical aspects of accurately weighing something individually in that condition). If one were however to weigh a small wading pool that someone then entered and began floating in, they would find that the full weight of the person was being borne by the pool and, ultimately, the scale underneath the pool. Whereas a buoyant object (on a properly working scale for weighing buoyant objects) would weigh less, the object

text: Again, unlike the effect that low-gravity environments have on weight, buoyancy does not make a portion of an object’s weight vanish; the missing weight is instead being borne by the ground, which leaves less force (weight) being applied to any scale theoretically placed underneath the object in question (though one may perhaps have some trouble with the practical aspects of accurately weighing something individually in that condition). If one were however to weigh a small wading pool that someone then entered and began floating in, they would find that the full weight of the person was being borne by the pool and, ultimately, the scale underneath the pool. Whereas a buoyant object (on a properly working scale for weighing buoyant objects) would weigh less, the object

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text: Titan has a surface gravity of 0.138 g, slightly less than that of the Moon. Managing long-term effects of low gravity on human health would therefore be a significant issue for long-term occupation of Titan, more so than on Mars. These effects are still an active field of study. They can include symptoms such as loss of bone density, loss of muscle density, and a weakened immune system. Astronauts in Earth orbit have remained in microgravity for up to a year or more at a time. Effective countermeasures for the negative effects of low gravity are well-established, particularly an aggressive regime of daily physical exercise or weighted clothing. The variation in the negative effects of low gravity as a function of different levels of low gravity are not known, since all research in this area is restricted to humans in zero gravity. The same goes for the potential effects of low gravity on fetal and pediatric development. It has been hypothesized that children born and raised in low gravity such as on Titan would not be well adapted for life under the higher gravity of Earth.

text: Titan has a surface gravity of 0.138

text: g

text: , slightly less than that of the Moon. Managing long-term

text: effects of low gravity on human health

text: would therefore be a significant issue for long-term occupation of Titan, more so than on Mars. These effects are still an active field of study. They can include symptoms such as loss of bone density, loss of muscle density, and a weakened

text: immune system

text: Astronaut

text: s in Earth orbit have remained in microgravity for up to a year or more at a time. Effective countermeasures for the negative effects of low gravity are well-established, particularly an aggressive regime of daily physical exercise or weighted clothing. The variation in the negative effects of low gravity as a function of different levels of low gravity are not known, since all research in this area is restricted to humans in zero gravity. The same goes for the potential effects of low gravity on fetal and pediatric development. It has been hypothesized that children born and raised in low gravity such as on Titan would not be well adapted for life under the higher gravity of Earth.

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answers: Gravity acts only between objects that are touching

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answers: weighted clothing

text: The Weak Equivalence Principle says that all objects fall the same way in a gravity field, no matter what they are made of. The Earth and the Moon have very different compositions—for example, the Earth has a large iron core, but the Moon does not. Furthermore, both are in orbit around the Sun, meaning they are both falling towards the Sun at all times, even as they revolve around each other. If the Earth and the Moon were affected differently by the gravity of the Sun, this would directly affect the orbit of the Moon around the Earth. But as closely as scientists can measure, the orbit of the Moon is just as predicted from assuming that gravity acts the same on each — to within 1 part in , the Earth and the Moon fall towards the Sun in exactly the same way, despite their different compositions. APOLLO will lead to even tighter limits.

text: The Weak Equivalence Principle says that all objects fall the same way in a gravity field, no matter what they are made of. The Earth and the Moon have very different compositions—for example, the Earth has a

text: large iron core

text: , but the Moon does not. Furthermore, both are in orbit around the Sun, meaning they are both falling towards the Sun at all times, even as they revolve around each other. If the Earth and the Moon were affected differently by the gravity of the Sun, this would directly affect the orbit of the Moon around the Earth. But as closely as scientists can measure, the orbit of the Moon is just as predicted from assuming that gravity acts the same on each — to within 1 part in , the Earth and the Moon fall towards the Sun in exactly the same way, despite their different compositions. APOLLO will lead to even tighter limits.

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answers: As closely as scientists can measure

text: is the local acceleration due to gravity,

text: is the local acceleration due to gravity,

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answers: the Moon

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answers: yes

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answers: gravity

text: In a different gravitational field, for example, on the surface of the Moon, an object can have a significantly different weight than on Earth. The gravity on the surface of the Moon is only about one-sixth as strong as on the surface of the Earth. A one-kilogram mass is still a one-kilogram mass (as mass is an extrinsic property of the object) but the downward force due to gravity, and therefore its weight, is only one-sixth of what the object would have on Earth. So a man of mass 180 pounds weighs only about 30 pounds-force when visiting the Moon.

text: In a different gravitational field, for example, on the surface of the

text: Moon

text: , an object can have a significantly different weight than on Earth. The gravity on the surface of the Moon is only about one-sixth as strong as on the surface of the Earth. A one-kilogram mass is still a one-kilogram mass (as mass is an extrinsic property of the object) but the downward force due to gravity, and therefore its weight, is only one-sixth of what the object would have on Earth. So a man of mass 180

text: pounds

text: weighs only about 30

text: pounds-force

text: when visiting the Moon.

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text: Valve Software's Half-Life 2 made significant use of physics in the game, powered by the Havok engine. Although the player can pick up and throw objects early in the game, this ability is somewhat limited in scope. Around a quarter of the way through the game, the player acquires the gravity gun, properly named as the "zero-point energy field manipulator". Alyx Vance explains that the gravity gun is designed for handling hazardous materials, but is mostly used for heavy lifting. She explains to Gordon that she once found it useful "for clearing minefields". The gravity gun significantly increases the player's ability to manipulate objects in the game. Like most other weapons in the game, the gravity gun has two trigger functions. The primary trigger causes the gun to emit a small discharge which emits energy to the targeted object. The distance which the object is forced is dependent on its weight and distance from the gun. The secondary trigger attracts the targeted object to the gun and holds it in midair a few inches away, negating its weight and allowing the player to carry it with them. Using the secondary trigger again will drop the item, while the primary trigger will launch it with considerable force.

text: Valve Software's Half-Life 2 made significant use of physics in the game, powered by the

text: Havok engine

text: . Although the player can pick up and throw objects early in the game, this ability is somewhat limited in scope. Around a quarter of the way through the game, the player acquires the gravity gun, properly named as the "

text: zero-point energy field manipulator

text: Alyx Vance

text: explains that the gravity gun is designed for handling hazardous materials, but is mostly used for heavy lifting. She explains to Gordon that she once found it useful "for clearing

text: minefields

text: ". The gravity gun significantly increases the player's ability to manipulate objects in the game. Like most other weapons in the game, the gravity gun has two trigger functions. The primary trigger causes the gun to emit a small discharge which emits energy to the targeted object. The distance which the object is forced is dependent on its weight and distance from the gun. The secondary trigger attracts the targeted object to the gun and holds it in midair a few inches away, negating its weight and allowing the player to carry it with them. Using the secondary trigger again will drop the item, while the primary trigger will launch it with considerable force.

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text: During the 1920s and 1930s, Felix Andries Vening Meinesz developed a unique gravimeter that could measure gravity in the stable environment of a submarine and used it to measure gravity over trenches. His measurements revealed that trenches are sites of downwelling in the solid Earth. The concept of downwelling at trenches was characterized by Griggs in 1939 as the tectogene hypothesis, for which he developed an analogue model using a pair of rotating drums. World War II in the Pacific led to great improvements of bathymetry in especially the western and northern Pacific, and the linear nature of these deeps became clear. The rapid growth of deep sea research efforts, especially the widespread use of echosounders in the 1950s and 1960s confirmed the morphological utility of the term. The important trenches were identified, sampled, and their greatest depths sonically plumbed.  The heroic phase of trench exploration culminated in the 1960 descent of the Bathyscaphe Trieste, which set an unbeatable world record by diving to the bottom of the Challenger Deep. Following Robert S. Dietz’ and Harry Hess’ articulation of the seafloor spreading hypothesis in the early 1960s and the plate tectonic revolution in the late 1960s the term “trench“ has been redefined with plate tectonic as well as bathymetric connotations.

text: During the 1920s and 1930s,

text: Felix Andries Vening Meinesz

text: developed a unique

text: gravimeter

text: that could measure

text: gravity

text: in the stable environment of a submarine and used it to measure gravity over trenches. His measurements revealed that trenches are sites of

text: downwelling

text: in the solid Earth. The concept of downwelling at trenches was characterized by Griggs in 1939 as the tectogene hypothesis, for which he developed an analogue model using a pair of rotating drums.

text: World War II

text: in the Pacific led to great improvements of bathymetry in especially the western and northern Pacific, and the linear nature of these deeps became clear. The rapid growth of deep sea research efforts, especially the widespread use of echosounders in the 1950s and 1960s confirmed the morphological utility of the term. The important trenches were identified, sampled, and their greatest depths sonically plumbed.  The heroic phase of trench exploration culminated in the 1960 descent of the

text: Bathyscaphe

text: Trieste

text: , which set an unbeatable world record by diving to the bottom of the Challenger Deep. Following

text: Robert S. Dietz

text: ’ and

text: Harry Hess

text: ’ articulation of the seafloor spreading hypothesis in the early 1960s and the plate tectonic revolution in the late 1960s the term “trench“ has been redefined with

text: plate tectonic

text: as well as bathymetric connotations.

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text: The term 'micro' gravity refers to a gravitational state that is 'low' (i.e., 'micro' in the sense of 'small' and not necessarily a millionth of Earth's normal gravity) such that the influence of buoyancy on physical processes may be considered small relative to other flow processes that would be present at normal gravity.  In such an environment, the thermal and flow transport dynamics can behave quite differently than in normal gravity conditions (e.g., a candle's flame takes the shape of a sphere.). Microgravity combustion research contributes to the understanding of a wide variety of aspects that are relevant to both the environment of a spacecraft (e.g., fire dynamics relevant to crew safety on the International Space Station) and terrestrial (Earth-based) conditions (e.g., droplet combustion dynamics to assist developing new fuel blends for improved combustion, materials fabrication processes, thermal management of electronic systems, multiphase flow boiling dynamics, and many others).

text: The term 'micro' gravity refers to a gravitational state that is 'low' (i.e., 'micro' in the sense of 'small' and not necessarily a millionth of Earth's normal gravity) such that the influence of

text: buoyancy

text: on physical processes may be considered small relative to other flow processes that would be present at normal gravity.  In such an environment, the thermal and

text: flow transport dynamics

text: can behave quite differently than in normal gravity conditions (e.g., a

text: candle

text: 's flame takes the shape of a sphere.). Microgravity combustion research contributes to the understanding of a wide variety of aspects that are relevant to both the environment of a spacecraft (e.g., fire dynamics relevant to crew safety on the

text: International Space Station

text: ) and terrestrial (Earth-based) conditions (e.g., droplet combustion dynamics to assist developing new fuel blends for improved combustion,

text: materials fabrication processes

text: thermal management of electronic systems

text: , multiphase flow boiling dynamics, and many others).

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answers: normal gravity

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answers: buoyancy

text: What is meant by Vacuity and Space, without which there could be neither Gravity nor Motion.

text: What is meant by Vacuity and Space, without which there could be neither Gravity nor Motion.

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answers: Vacuity and Space

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answers: distance

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answers: Gravity

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answers: Gravity

answers: NDQ_017290

answers: Balance

text: Dubai Crude is a medium oil. It has a gravity of 31° API (specific gravity of 0.871) and a sulfur content of 2%/weight

text: Dubai Crude is a medium oil. It has a gravity of 31°

text: API

text: specific gravity

text: of 0.871) and a sulfur content of 2%/weight

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answers: It acts only between objects that are touching

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answers: weight

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answers: Dubai Crude

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answers: Gravity

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answers: Gravity

text: The formula to calculate API gravity from Specific Gravity (SG) is:

text: The formula to calculate API gravity from

text: Specific Gravity

text: (SG) is:

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answers: Gravity acts only between objects that are touching

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answers: density

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answers: API

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answers: Gravity

answers: NDQ_017290

answers: Specific Gravity

text: One of the difficulties of quantum gravity is that quantum gravitational effects are only expected to become apparent near the Planck scale, a scale far smaller in distance (equivalently, far larger in energy) than what is currently accessible at high energy particle accelerators. As a result, quantum gravity is a mainly theoretical enterprise, although there are speculations about how quantum gravitational effects might be observed in existing experiments.

text: One of the difficulties of quantum gravity is that quantum gravitational effects are only expected to become apparent near the

text: Planck scale

text: , a scale far smaller in distance (equivalently, far larger in energy) than what is currently accessible at high energy

text: particle accelerator

text: s. As a result, quantum gravity is a mainly theoretical enterprise, although there are speculations about how quantum gravitational effects might be observed in existing experiments.

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answers: Gravity acts only between objects that are touching

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answers: particle accelerators

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answers: Quantum gravity

answers: NDQ_017290

answers: Gravity

text: The surface gravity field used in the Unified WGS Solution consisted of a set of 410 10° × 10° equal area mean free air gravity anomalies determined solely from terrestrial data. This gravity field includes mean anomaly values compiled directly from observed gravity data wherever the latter was available in sufficient quantity. The value for areas of sparse or no observational data were developed from geophysically compatible gravity approximations using gravity-geophysical correlation techniques. Approximately 45 percent of the 410 mean free air gravity anomaly values were determined directly from observed gravity data.

text: The surface gravity field used in the Unified WGS Solution consisted of a set of 410 10° × 10° equal area mean free air gravity anomalies determined solely from terrestrial data. This gravity field includes mean anomaly values compiled directly from observed gravity data wherever the latter was available in sufficient quantity. The value for areas of sparse or no observational data were developed from geophysically compatible gravity approximations using gravity-geophysical correlation techniques. Approximately 45 percent of the 410 mean free air gravity anomaly values were determined directly from observed gravity data.

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answers: It acts only between objects that are touching

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answers: distance

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answers: terrestrial

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answers: Gravity

answers: NDQ_017290

answers: This gravity field includes mean anomaly values

text: replaced by the effective gravity

text: replaced by the effective gravity

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answers: 2: The answer has limited relevance and completeness, with significant gaps or inaccuracies.

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answers: acts only between objects that are touching

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answers: effective gravity

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answers: effective gravity

answers: NDQ_017290

answers: effective gravity

text: A funicular is not a true gravity railroad, as cars never coast freely and are always connected to a cable. A rack-and-pinion railway or rack railway is also not a true gravity railroad for similar reasons.

text: A

text: funicular

text: is not a true gravity railroad, as cars never coast freely and are always connected to a cable. A rack-and-pinion railway or

text: rack railway

text: is also not a true gravity railroad for similar reasons.

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answers: A true gravity railroad

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answers: true gravity

answers: NDQ_017290

answers: Gravity

text: For a given gravitational potential energy at a given position, the escape velocity is the minimum speed an object without propulsion needs to be able to "escape" from the gravity (i.e. so that gravity will never manage to pull it back). For the sake of simplicity, unless stated otherwise, we will assume that an object is attempting to escape from a uniform spherical planet by moving directly away from it (along a radial line away from the center of the planet) and that the only significant force acting on the moving object is the planet's gravity.

text: For a given

text: gravitational potential

text: energy at a given position, the escape velocity is the minimum

text: speed

text: an object without

text: propulsion

text: needs to be able to "escape" from the gravity (i.e. so that gravity will never manage to pull it back). For the sake of simplicity, unless stated otherwise, we will assume that an object is attempting to escape from a uniform spherical planet by moving directly away from it (along a radial line away from the center of the planet) and that the only significant force acting on the moving object is the planet's gravity.

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answers: For the sake of simplicity

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answers: Gravity

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answers: Gravity

text: where g is the surface gravity of an object, expressed as a multiple of the Earth's, m is its mass, expressed as a multiple of the Earth's mass (5.976·10 kg) and r its radius, expressed as a multiple of the Earth's (mean) radius (6,371 km). For instance, Mars has a mass of 6.4185·10 kg = 0.107 Earth masses and a mean radius of 3,390 km = 0.532 Earth radii. The surface gravity of Mars is therefore approximately

text: where g is the surface gravity of an object, expressed as a multiple of the

text: Earth

text: 's, m is its mass, expressed as a multiple of the

text: Earth

text: 's mass (5.976·10 kg) and r its radius, expressed as a multiple of the Earth's (mean) radius (6,371 km). For instance,

text: Mars

text: has a mass of 6.4185·10 kg = 0.107 Earth masses and a mean radius of 3,390 km = 0.532 Earth radii. The surface gravity of Mars is therefore approximately

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answers: Earth's

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answers: mass

text: They visit a high gravity planet they encounter many insect-like aliens who have adapted to 1.5 times Earth's gravity. High gravity means thicker atmosphere and easier flight.

text: They visit a high gravity planet they encounter many

text: insect

text: -like

text: aliens

text: who have adapted to 1.5 times Earth's

text: gravity

text: . High gravity means thicker

text: atmosphere

text: and easier flight.

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answers: Gravity acts only between objects that are touching

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answers: Gravity

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answers: Earth's

text: Loop quantum gravity (LQG) is a theory that attempts to describe the quantum properties of the universe and gravity. It is also a theory of quantum spacetime because, according to general relativity, gravity is a manifestation of the geometry of spacetime. LQG is an attempt to merge quantum mechanics and general relativity.

text: Loop quantum gravity (LQG) is a theory that attempts to describe the

text: quantum

text: properties of the universe and

text: gravity

text: . It is also a theory of quantum

text: spacetime

text: because, according to

text: general relativity

text: , gravity is a manifestation of the geometry of spacetime. LQG is an attempt to merge

text: quantum mechanics

text: and general relativity.

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answers: It is also a theory of quantum spacetime

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answers: geometry

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answers: universe

answers: NDQ_017286

answers: According to general relativity

answers: NDQ_017290

answers: Gravity

text: In chemistry, gravity is the density of a fluid, particularly a fuel. It is expressed in degrees, with lower numbers indicating heavier liquids and higher numbers indicating lighter liquids. See specific gravity and API gravity.

text: In

text: chemistry

text: , gravity is the density of a

text: fluid

text: , particularly a

text: fuel

text: . It is expressed in degrees, with lower numbers indicating heavier liquids and higher numbers indicating lighter liquids. See

text: specific gravity

text: and

text: API gravity

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text: After his time in the EVA group, in 2006 Gerty became a Constellation Program Systems Integration Engineer, helping plan for lunar missions.  He worked with a group defining requirements for what humans need to live and work on the surface of the Moon.  The planning covered not only short missions like those of the Apollo program, but long-term missions taking up half a year or more, and covered not only EVAs, but solving the problems of habitation and physiological problems as well.  To do this, the group examined the past Apollo missions, long-duration Expeditions to the ISS, and "spaceflight analog missions" like NEEMO, which in many ways simulate a mission to the Moon.  In Gerty's words:  "NASA has questions like, 'What is the best way for robots and humans to work together on the lunar or Martian surface?', or 'How much room do astronauts need to live and work in 1/6 of the Earth’s gravity, compared to the zero-gravity on the ISS?'"

text: After his time in the EVA group, in 2006 Gerty became a

text: Constellation Program

text: Systems Integration Engineer, helping plan for

text: lunar mission

text: s.  He worked with a group defining requirements for what humans need to live and work on the surface of the

text: Moon

text: .  The planning covered not only short missions like those of the

text: Apollo program

text: , but long-term missions taking up half a year or more, and covered not only EVAs, but solving the problems of habitation and

text: physiological

text: problems as well.  To do this, the group examined the past Apollo missions, long-duration

entity_name: List of International Space Station expeditions

text: Expeditions

text: to the ISS, and "

text: spaceflight analog missions

text: " like

text: NEEMO

text: , which in many ways simulate a mission to the Moon.  In Gerty's words:  "NASA has questions like, 'What is the best way for

text: robot

text: s and humans to work together on the lunar or

text: Martian

text: surface?', or 'How much room do astronauts need to live and work in 1/6 of the

text: Earth

text: ’s

text: gravity

text: , compared to the

text: zero-gravity

text: on the ISS?'"

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text: The SZD-6x Nietoperz (Bat) was designed and built to research tail-less aircraft, and the control of them. Main designers were Władysław Nowakowski and Justyn Sandauer. Built in a conventional fashion using wood throughout, fabric covering and steel for highly stressed parts and fittings the SZD-6x was a cantilever monoplane with the cranked wing attached to a short fuselage pod at the mid position. The inner portion of each wing was markedly swept forward out to approx. quarter-span, where the swept-back outer wing panels were attached. This is arrangement allowed for maximum distance between the centre of gravity and the vertical stabilizer, and placed the pilot at the centre of gravity, so that differing pilot weights had little impact on stability.

text: The SZD-6x Nietoperz (Bat) was designed and built to research tail-less aircraft, and the control of them. Main designers were Władysław Nowakowski and Justyn Sandauer. Built in a conventional fashion using wood throughout, fabric covering and steel for highly stressed parts and fittings the SZD-6x was a cantilever monoplane with the cranked wing attached to a short fuselage pod at the mid position. The inner portion of each wing was markedly swept forward out to approx. quarter-span, where the swept-back outer wing panels were attached. This is arrangement allowed for maximum distance between the centre of gravity and the

text: vertical stabilizer

text: , and placed the pilot at the centre of gravity, so that differing pilot weights had little impact on stability.

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text: The station's constructions include the dam, a power plant building located near the dam, and an additional spillway which is under construction. The arch-gravity dam is  high. It has a crest length of , crest width of , base width of  and maximum head of . It consists of a solid left-bank dam  long, a power dam  long, a spillway dam  long and a solid right-bank dam  long. It is by far the larger of only two gravity-arch dams in Russia. Water pressure for the dam is approximately 30 million tons, of which 60% is neutralized by the dam's own weight and 40% is carried to rock on the bank

text: The station's constructions include the dam, a power plant building located near the dam, and an additional spillway which is under construction. The

text: arch-gravity dam

text: is  high. It has a crest length of , crest width of , base width of  and maximum head of . It consists of a solid left-bank dam  long, a power dam  long, a spillway dam  long and a solid right-bank dam  long. It is by far the larger of only two gravity-arch dams in Russia. Water pressure for the dam is approximately 30 million tons, of which 60% is neutralized by the dam's own weight and 40% is carried to rock on the bank

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answers: 2: The answer has limited relevance and completeness, with noticeable gaps or inaccuracies.

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answers: Gravity acts only between objects that are touching

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text: Another operational problem with general relativity is the difficulty to do calculations, because of the complexity of the mathematical tools used. Integral of path in contrast has been used in mechanics since the end of the 19th century and is well known. In addition Path integral is a formalism used both in mechanics and quantum theories so it might be a good starting point for unifying general relativity and quantum theories. Some quantum features like the Schrödinger equation and the heat equation are also related by Wick rotation. So the Wick relation is a good tool to relate a classical phenomenon to a quantum phenomenon. The ambition of Euclidean quantum gravity is to use the Wick rotation to find connections between a macroscopic phenomenon, gravity, and something more microscopic.

text: Another operational problem with general relativity is the difficulty to do calculations, because of the complexity of the mathematical tools used. Integral of path in contrast has been used in mechanics since the end of the 19th century and is well known. In addition Path integral is a formalism used both in mechanics and quantum theories so it might be a good starting point for unifying general relativity and quantum theories. Some quantum features like the

text: Schrödinger equation

text: and the

text: heat equation

text: are also related by Wick rotation. So the Wick relation is a good tool to relate a classical phenomenon to a quantum phenomenon. The ambition of Euclidean quantum gravity is to use the Wick rotation to find connections between a macroscopic phenomenon, gravity, and something more microscopic.

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answers: The Wick relation is a good tool

text: Newton came to realize that the effects of gravity might be observed in different ways at larger distances. In particular, Newton determined that the acceleration of the Moon around the Earth could be ascribed to the same force of gravity if the acceleration due to gravity decreased as an inverse square law. Further, Newton realized that the acceleration due to gravity is proportional to the mass of the attracting body. Combining these ideas gives a formula that relates the mass (

text: Newton came to realize that the effects of gravity might be observed in different ways at larger distances. In particular, Newton determined that the acceleration of the Moon around the Earth could be ascribed to the same force of gravity if the acceleration due to gravity decreased as an

text: inverse square law

text: . Further, Newton realized that the acceleration due to gravity is proportional to the mass of the attracting body. Combining these ideas gives a formula that relates the mass (

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answers: 1: The answer has limited relevance and completeness, with noticeable gaps or inaccuracy.

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answers: Gravity acts only between objects that are touching.

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answers: Newton determined that the acceleration of the Moon around the Earth

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answers: Newton determined that the acceleration of the Moon around the Earth

text: The distinction between mass and weight is unimportant for many practical purposes because the strength of gravity does not vary too much on the surface of the Earth. In a uniform gravitational field, the gravitational force exerted on an object (its weight) is directly proportional to its mass. For example, object A weighs 10 times as much as object B, so therefore the mass of object A is 10 times greater than that of object B. This means that an object's mass can be measured indirectly by its weight, and so, for everyday purposes, weighing (using a weighing scale) is an entirely acceptable way of measuring mass. Similarly, a balance measures mass indirectly by comparing the weight of the measured item to that of an object(s) of known mass.  Since the measured item and the comparison mass are in virtually the same location, so experiencing the same gravitational field, the effect of varying gravity does not affect the comparison or the resulting measurement.

text: The distinction between mass and weight is unimportant for many practical purposes because the strength of gravity does not vary too much on the surface of the Earth. In a uniform gravitational field, the gravitational force exerted on an object (its weight) is

text: directly proportional

text: to its mass. For example, object A weighs 10 times as much as object B, so therefore the mass of object A is 10 times greater than that of object B. This means that an object's mass can be measured indirectly by its weight, and so, for everyday purposes,

text: weighing

text: (using a

text: weighing scale

text: ) is an entirely acceptable way of measuring mass. Similarly, a

text: balance

text: measures mass indirectly by comparing the weight of the measured item to that of an object(s) of known mass.  Since the measured item and the comparison mass are in virtually the same location, so experiencing the same

text: gravitational field

text: , the effect of varying gravity does not affect the comparison or the resulting measurement.

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text: with g the Earth's gravity.

text: with g the

text: Earth's gravity

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text: In the 18th century, there were two approaches to the definition of the standard unit of length. One favoured Wilkins approach: to define the metre in terms of the length of a pendulum which produced a half-period of one second. The other approach was to define the metre as one ten-millionth () of the length of a quadrant along the Earth's meridian; that is, the distance from the Equator to the North Pole. This means that the quadrant (a section/distance  of the Earth's circumference) would have been defined as exactly 10 000 000 metres (10 000 km) at that time, with the total circumference of the Earth defined as 40 000 000 metres (40 000 km). In 1791, the French Academy of Sciences selected the meridional definition over the pendular definition because the force of gravity varies slightly over the surface of the Earth, which affects the period of a pendulum.

text: In the 18th century, there were two approaches to the definition of the standard unit of length. One favoured Wilkins approach: to define the metre in terms of the length of a pendulum which produced a half-period of one second. The other approach was to define the metre as one ten-millionth () of the length of a

text: quadrant

text: along the

text: Earth

text: 's

text: meridian

text: ; that is, the distance from the

text: Equator

text: to the

text: North Pole

text: . This means that the quadrant (a section/distance  of the Earth's circumference) would have been defined as exactly 10 000 000 metres (10 000 km) at that time, with the total circumference of the Earth defined as 40 000 000 metres (40 000 km). In 1791, the

text: French Academy of Sciences

text: selected the meridional definition over the pendular definition because the force of

text: gravity

text: varies slightly

text: over the surface of the Earth, which affects the period of a pendulum.

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text: The position of the diver's centre of gravity is determined by the distribution of weight, which is in most cases determined by the actual equipment in use. Trim of the centre of gravity is usually achieved by selection of cylinder material and positioning of main ballast weights and trim weights. Aluminium cylinders are generally less negatively buoyant than steel cylinders of equivalent capacity, and high pressure cylinders more negative than low pressure cylinders of the same material.

text: The position of the diver's centre of gravity is determined by the distribution of weight, which is in most cases determined by the actual equipment in use. Trim of the centre of gravity is usually achieved by selection of

text: cylinder

text: material and positioning of main

text: ballast weights

text: and trim weights. Aluminium cylinders are generally less negatively buoyant than steel cylinders of equivalent capacity, and high pressure cylinders more negative than low pressure cylinders of the same material.

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text: Where P is the pressure at depth h in the column, g is the acceleration of gravity and ρ is the density of the fluid.  It is common in the oil industry to use weight density, which is the product of mass density and the acceleration of gravity.  This reduces the equation to:

text: Where P is the pressure at depth h in the column, g is the

text: acceleration of gravity

text: and ρ is the

text: density

text: of the fluid.  It is common in the

text: oil industry

text: to use

text: weight density

text: , which is the product of mass density and the acceleration of gravity.  This reduces the equation to:

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answers: It is common in the oil industry

text: Gravity R&D  (full name: Gravity Research & Development Zrt.) is an IT vendor specialized in recommender systems. Gravity was founded by members of the Netflix Prize team "Gravity".

text: Gravity R&D  (full name: Gravity Research & Development Zrt.) is an

text: IT

text: vendor specialized in

text: recommender system

text: s. Gravity was founded by members of the

text: Netflix Prize

text: team "Gravity".

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answers: Gravity

text: (see the PPN article on observational bounds on these parameters). Lorentz violations are also discussed in relation to Alternatives to general relativity such as Loop quantum gravity, Emergent gravity, Einstein aether theory or Hořava–Lifshitz gravity.

text: (see the

text: PPN

text: article on observational bounds on these parameters). Lorentz violations are also discussed in relation to

text: Alternatives to general relativity

text: such as

text: Loop quantum gravity

text: Emergent gravity

text: Einstein aether theory

text: or

text: Hořava–Lifshitz gravity

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text: Considering the Earth–Moon system as a binary planet, its centre of gravity is within Earth, about  or 72.6% of the Earth's radius from the centre of the Earth. This centre of gravity remains on the line between the centres of the earth and Moon as the Earth completes its diurnal rotation. The path of the Earth–Moon system in its solar orbit is defined as the movement of this mutual centre of gravity around the sun. Consequently, Earth's centre veers inside and outside the solar orbital path during each synodic month as the Moon moves in its orbit around the common centre of gravity.

text: Considering the Earth–Moon system as a

text: binary planet

text: , its centre of gravity is within Earth, about  or 72.6% of the Earth's radius from the centre of the Earth. This centre of gravity remains on the line between the centres of the earth and Moon as the Earth completes its diurnal rotation. The path of the Earth–Moon system in its solar orbit is defined as the movement of this mutual centre of gravity around the sun. Consequently, Earth's centre veers inside and outside the solar orbital path during each synodic month as the Moon moves in its orbit around the common centre of gravity.

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answers: It acts only between objects that are touching

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answers: Gravity

text: Gravity separation is a method used for separating the components of a mixture with different specific weight. Gravity separation in dry milling is utilized in order to separate endosperm from germ.

text: Gravity separation is a method used for separating the components of a mixture with different specific weight. Gravity separation in dry milling is utilized in order to separate endosperm from germ.

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answers: weight

text: The Army purchased a purpose-built armored car, the M1117 Armored Security Vehicle also known as an armored personnel carrying vehicle (APC), in limited numbers for use by the United States Army Military Police Corps. In 2007, the Marine Corps announced an intention to replace all HMMWVs in Iraq with MRAPs due to high loss rates, and issued contracts for the purchase of several thousand of these vehicles, which include the International MaxxPro, the BAE OMC RG-31, the BAE RG-33 and Caiman, and the Force Protection Cougar, which were deployed primarily for mine clearing duties. Heavier models of infantry mobility vehicles (IMV) can also be used for patrol vehicles. The MaxxPro Line has been shown to have the highest rate of vehicle rollover accidents to its very high center of gravity and immense weight. The massive weight of these vehicles combined with their high center of gravity also greatly reduces their utility in off-road situations versus the HMMWV, which was the primary cause for the push for the Oshkosh M-ATV to be developed quickly.

text: The Army purchased a purpose-built armored car, the

text: M1117 Armored Security Vehicle

text: also known as an armored personnel carrying vehicle (APC), in limited numbers for use by the

text: United States Army Military Police Corps

text: . In 2007, the Marine Corps announced an intention to replace all HMMWVs in Iraq with

text: MRAP

text: s due to high loss rates, and issued contracts for the purchase of several thousand of these vehicles, which include the International

text: MaxxPro

text: , the

text: BAE OMC

text: , the BAE

text: and

text: Caiman

text: , and the

text: Force Protection

text: Cougar

text: , which were deployed primarily for mine clearing duties. Heavier models of

text: infantry mobility vehicle

text: s (IMV) can also be used for patrol vehicles. The MaxxPro Line has been shown to have the highest rate of vehicle rollover accidents to its very high

text: center of gravity

text: and immense weight. The massive weight of these vehicles combined with their high center of gravity also greatly reduces their utility in off-road situations versus the HMMWV, which was the primary cause for the push for the

text: Oshkosh M-ATV

text: to be developed quickly.

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answers: The MaxxPro Line

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answers: The MaxxPro Line

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answers: center of gravity

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answers: The massive weight

text: Where N, the normal force, is equal to the weight (mass x gravity) of the sitting mass (m) and F, the loading force, is equal to the weight (mass x gravity) of the hanging mass (m).

text: Where N, the normal force, is equal to the weight (mass x gravity) of the sitting mass (m) and F, the loading force, is equal to the weight (mass x gravity) of the hanging mass (m).

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answers: It acts between objects that are touching

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answers: mass

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answers: hanging mass

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answers: Gravity

answers: NDQ_017290

answers: mass x gravity

text: is equal to the propagation velocity of a shallow gravity wave

text: is equal to the propagation velocity of a shallow gravity wave

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answers: 3: The answer has limited relevance and completeness, with noticeable gaps or inaccuracy.

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answers: is equal to the propagation velocity

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answers: distance

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answers: shallow gravity wave

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: balance

text: A gravity hill, also known as a magnetic hill, mystery hill, mystery spot or gravity road, is a place where the layout of the surrounding land produces an optical illusion, making a slight downhill slope appear to be an uphill slope. Thus, a car left out of gear will appear to be rolling uphill against gravity. There are hundreds of recognised gravity hills around the world; see  list of gravity hills.

text: A gravity hill, also known as a magnetic hill, mystery hill, mystery spot or gravity road, is a place where the layout of the surrounding land produces an

text: optical illusion

text: , making a slight downhill slope appear to be an uphill slope. Thus, a car left out of gear will appear to be rolling uphill against

text: gravity

text: . There are hundreds of recognised gravity hills around the world; see

text: list of gravity hills

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answers: Gravity acts only between objects that are touching

answers: NDQ_017283

answers: surroundings

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answers: car

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity

text: The gravitational field of the earth is neither perfect nor uniform. A flattened ellipsoid is typically used as the idealized earth, but even if the earth were perfectly spherical, the strength of gravity would not be the same everywhere, because density (and therefore mass) varies throughout the planet. This is due to magma distributions, mountain ranges, deep sea trenches, and so on.

text: The gravitational field of the earth is neither perfect nor uniform. A flattened ellipsoid is typically used as the idealized earth, but even if the earth were perfectly spherical, the strength of gravity would not be the same everywhere, because density (and therefore mass) varies throughout the planet. This is due to magma distributions, mountain ranges, deep sea trenches, and so on.

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answers: gravity acts only between objects that are touching

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answers: Yes

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answers: mass

text: Gravity decreases with altitude as one rises above the Earth's surface because greater altitude means greater distance from the Earth's centre. All other things being equal, an increase in altitude from sea level to  causes a weight decrease of about 0.29%. (An additional factor affecting apparent weight is the decrease in air density at altitude, which lessens an object's buoyancy. This would increase a person's apparent weight at an altitude of 9,000 metres by about 0.08%)

text: Gravity decreases with altitude as one rises above the Earth's surface because greater altitude means greater distance from the Earth's centre. All other things being equal, an increase in altitude from sea level to  causes a weight decrease of about 0.29%. (An additional factor affecting apparent weight is the decrease in air density at altitude, which lessens an object's buoyancy. This would increase a person's apparent weight at an altitude of 9,000 metres by about 0.08%)

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answers: Gravity acts only between objects that are touching

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answers: All other things being equal

text: Wolfe believes that the Earth is flat and that gravity is a hoax.

text: Wolfe believes that

text: the Earth is flat

text: and that

text: gravity

text: is a hoax.

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answers: gravity acts only between objects that are touching

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text: High specific gravity is a diagnostic property of a mineral. A variation in chemistry (and consequently, mineral class) correlates to a change in specific gravity. Among more common minerals, oxides and sulfides tend to have a higher specific gravity as they include elements with higher atomic mass. A generalization is that minerals with metallic or adamantine lustre tend to have higher specific gravities than those having a non-metallic to dull lustre. For example, hematite, FeO, has a specific gravity of 5.26 while galena, PbS, has a specific gravity of 7.2–7.6, which is a result of their high iron and lead content, respectively. A very high specific gravity becomes very pronounced in native metals; kamacite, an iron-nickel alloy common in iron meteorites has a specific gravity of 7.9, and gold has an observed specific gravity between 15 and 19.3.

text: High specific gravity is a diagnostic property of a mineral. A variation in chemistry (and consequently, mineral class) correlates to a change in specific gravity. Among more common minerals, oxides and sulfides tend to have a higher specific gravity as they include elements with higher atomic mass. A generalization is that minerals with metallic or adamantine lustre tend to have higher specific gravities than those having a non-metallic to dull lustre. For example, hematite, FeO, has a specific gravity of 5.26 while

text: galena

text: , PbS, has a specific gravity of 7.2–7.6, which is a result of their high iron and lead content, respectively. A very high specific gravity becomes very pronounced in

text: native metal

text: s;

text: kamacite

text: , an iron-nickel alloy common in

text: iron meteorite

text: s has a specific gravity of 7.9, and gold has an observed specific gravity between 15 and 19.3.

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text: Much of Canada’s petroleum effort has focused on producing oil from the oil sands (sometimes called “tar sands”) of northern Alberta. To appreciate these resources, it is important to understand a simple concept from chemistry and physics: the "gravity" of crude oil and natural gas liquids. The oil industry measures the weight of oil on terms of an artificial scale known as API (American Petroleum Institute) gravity. Ten degrees API is the gravity of water. Light oils use a higher API number. Generally heavier than water, bitumen typically has an API of 8-10 degrees API.

text: Much of Canada’s petroleum effort has focused on producing oil from the

text: oil sands

text: (sometimes called “

text: tar sands

text: ”) of northern Alberta. To appreciate these resources, it is important to understand a simple concept from

text: chemistry

text: and

text: physics

text: : the "gravity" of

text: crude oil

text: and

text: natural gas liquids

text: . The oil industry measures the weight of oil on terms of an artificial scale known as API (American Petroleum Institute) gravity. Ten degrees API is the gravity of water. Light oils use a higher API number. Generally heavier than water, bitumen typically has an API of 8-10 degrees API.

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text: GravityLight is a gravity-powered lamp designed by the company Deciwatt for use in developing or third-world nations, as a replacement for kerosene lamps. It uses a bag filled with rocks or earth, attached to a cord, which slowly descends similar to the weight drive in a cuckoo clock. This action powers the light for up to thirty minutes.

text: GravityLight is a

text: gravity-powered lamp

text: designed by the company Deciwatt for use in

text: developing

text: or

text: third-world

text: nations, as a replacement for

text: kerosene lamp

text: s. It uses a bag filled with rocks or earth, attached to a cord, which slowly descends similar to the weight drive in a

text: cuckoo clock

text: . This action powers the light for up to thirty minutes.

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answers: GravityLight

text: The film starts with Adam telling the story of his two-planet home world, unique from other planets or planetary systems as it is the only one that has "dual gravity". This phenomenon of dual gravity allows the two planets to orbit each other in what would otherwise be impossibly close proximity. There are three immutable laws of gravity for this two-planet system:

text: The film starts with Adam telling the story of his two-planet home world, unique from other planets or planetary systems as it is the only one that has "dual gravity". This phenomenon of dual gravity allows the two planets to orbit each other in what would otherwise be impossibly close proximity. There are three immutable laws of gravity for this two-planet system:

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answers: It acts only between objects that are touching.

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answers: The film starts with Adam telling the story

text: Loop quantum gravity could lend support to digital physics, in that it assumes space-time is quantized. Paola Zizzi has formulated a realization of this concept in what has come to be called "computational loop quantum gravity", or CLQG. Other theories that combine aspects of digital physics with loop quantum gravity are those of Marzuoli and Rasetti and Girelli and Livine.

text: Loop quantum gravity

text: could lend support to digital physics, in that it assumes space-time is quantized.

text: Paola Zizzi

text: has formulated a realization of this concept in what has come to be called "computational loop quantum gravity", or CLQG. Other theories that combine aspects of digital physics with loop quantum gravity are those of Marzuoli and Rasetti and Girelli and Livine.

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text: The 20th century, however, brought the need for a more precise definition. A standardized value for acceleration due to gravity was therefore needed.  Today, in accordance with the General Conference on Weights and Measures, standard gravity is usually taken to be 9.80665 m/s (about 32.174 049 ft/s).

text: The 20th century, however, brought the need for a more precise definition. A standardized value for acceleration due to gravity was therefore needed.  Today, in accordance with the

entity_name: General Conference on Weights and Measures

text: General Conference on Weights and Measures

text: standard gravity

text: is usually taken to be 9.80665 m/s (about 32.174 049 ft/s).

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text: The Geosat GM goal was to provide information on the marine gravity field.  If the ocean surface were at rest, and to forcing such as tides or winds were acting on it, the water surface would lie along the geoid.  To first order, the Earth shape is an oblate spheroid.  Subsurface features such as seamounts create a gravitational pull, and features such as ocean trenches create lower gravity areas.  Spatial variations in gravity exert influence on the ocean surface and thereby cause spatial structure in the geoid.  The deviations of the geoid from the first order spheroid are on the order of ± 100m.  By measuring the position of the water surface above the Earth center, the geoid is observed, and the gravity field can be computed through inverse calculations.

text: The Geosat GM goal was to provide information on the marine gravity field.  If the ocean surface were at rest, and to forcing such as tides or winds were acting on it, the water surface would lie along the

text: geoid

text: .  To first order, the Earth shape is an oblate spheroid.  Subsurface features such as

text: seamount

text: s create a gravitational pull, and features such as

text: ocean trenches

text: create lower gravity areas.  Spatial variations in gravity exert influence on the ocean surface and thereby cause spatial structure in the geoid.  The deviations of the geoid from the first order spheroid are on the order of ± 100m.  By measuring the position of the water surface above the Earth center, the geoid is observed, and the gravity field can be computed through inverse calculations.

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text: In the oil industry, a pure SI system is extremely rare.  Weight densities are commonly either given as specific gravity or in pounds per gallon.  Simple conversion factors (0.433 for specific gravity and 0.052 for ppg) convert these values to a pressure gradient in psi per foot.  Multiplying by the depth in feet gives the pressure at the bottom of the column.

text: In the

text: oil industry

text: , a pure

text: SI system

text: is extremely rare.  Weight densities are commonly either given as

text: specific gravity

text: or in

text: pounds

text: per

text: gallon

text: .  Simple conversion factors (0.433 for specific gravity and 0.052 for ppg) convert these values to a pressure gradient in

text: psi

text: per

text: foot

text: .  Multiplying by the depth in feet gives the pressure at the bottom of the column.

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answers: It acts only between objects that are touching

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text: Using telescopes on Earth, the reflectors on the Moon, and accurate timing of laser pulses, by the early 2000s scientists could measure and predict the orbit of the Moon to an accuracy of a few centimeters. This already impressive accuracy (the Moon is typically about 385,000 km away) provides the best known test of many aspects of our theories of gravity. APOLLO improves this even further, measuring the distance between the Moon to an accuracy of a few millimeters. Using this information, scientists will be able to further test various aspects of gravity: do the Earth and the Moon react the same to gravity despite their different compositions?  Does the energy content of the Earth and the Moon react to gravity in the same way as Einstein predicts?  In general, does Einstein's General Relativity correctly predict the motion of the Moon, or are new theories required?

text: Using telescopes on Earth, the reflectors on the Moon, and accurate timing of

text: laser

text: pulses, by the early 2000s scientists could measure and predict the

text: orbit

text: of the Moon to an accuracy of a few centimeters. This already impressive accuracy (the Moon is typically about 385,000 km away) provides the best known test of many aspects of our

text: theories of gravity

text: . APOLLO improves this even further, measuring the distance between the Moon to an accuracy of a few millimeters. Using this information, scientists will be able to further test various aspects of gravity: do the Earth and the Moon react the same to gravity despite their different compositions?  Does the energy content of the Earth and the Moon react to gravity in the same way as

text: Einstein

text: predicts?  In general, does Einstein's

text: General Relativity

text: correctly predict the motion of the Moon, or are new theories required?

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answers: The Moon is typically about 385,000 km away

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answers: APOLLO

text: Gravity feed fuel systems are not immune to vapor lock. Much of the foregoing applies equally to a gravity feed system; if vapor forms in the fuel line, its lower density reduces the pressure developed by the weight of the fuel. This pressure is what normally moves fuel from the tank to the carburetor, so fuel supply will be disrupted until the vapor is removed, either by the remaining fuel pressure forcing it into the float bowl and out the vent or by allowing the vapor to cool and re-condense.

text: Gravity feed fuel systems are not immune to vapor lock. Much of the foregoing applies equally to a gravity feed system; if vapor forms in the fuel line, its lower density reduces the pressure developed by the weight of the fuel. This pressure is what normally moves fuel from the tank to the carburetor, so fuel supply will be disrupted until the vapor is removed, either by the remaining fuel pressure forcing it into the float bowl and out the vent or by allowing the vapor to cool and re-condense.

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answers: weight

text: Although the size of an object may be reflected in its mass or its weight, each of these is a different concept. In scientific contexts, mass refers loosely to the amount of "matter" in an object (though "matter" may be difficult to define), whereas weight refers to the force experienced by an object due to gravity. An object with a mass of 1.0 kilogram will weigh approximately 9.81 newtons (newton is the unit of force, while kilogram is the unit of mass) on the surface of the Earth (its mass multiplied by the gravitational field strength). Its weight will be less on Mars (where gravity is weaker), more on Saturn, and negligible in space when far from any significant source of gravity, but it will always have the same mass. Two objects of equal size, however, may have very different mass and weight, depending on the composition and density of the objects. By contrast, if two objects are known to have roughly the same composition, then some information about the size of one can be determined by measuring the size of the other, and determining the difference in weight between the two. For example, if two blocks of wood are equally dense, and it is known that one weighs ten kilograms and the other weighs twenty kilograms, and that the ten kilogram block has a volume of one cubic foot, then it can be estimated that the twenty kilogram block has a volume of two cubic feet.

text: Although the size of an object may be reflected in its

text: mass

text: or its

text: weight

text: , each of these is a different concept. In scientific contexts, mass refers loosely to the amount of "

text: matter

text: " in an object (though "matter" may be difficult to define), whereas weight refers to the

text: force

text: experienced by an object due to

text: gravity

text: . An object with a mass of 1.0 kilogram will weigh approximately 9.81 newtons (

text: newton

text: is the unit of force, while

text: kilogram

text: is the unit of mass) on the surface of the

text: Earth

text: (its mass multiplied by the

text: gravitational field strength

text: ). Its weight will be less on

text: Mars

text: (where gravity is weaker), more on

text: Saturn

text: , and negligible in space when far from any significant source of gravity, but it will always have the same mass. Two objects of equal size, however, may have very different mass and weight, depending on the

text: composition

text: and

text: density

text: of the objects. By contrast, if two objects are known to have roughly the same composition, then some information about the size of one can be determined by measuring the size of the other, and determining the difference in weight between the two. For example, if two blocks of wood are equally dense, and it is known that one weighs ten kilograms and the other weighs twenty kilograms, and that the ten kilogram block has a volume of one cubic foot, then it can be estimated that the twenty kilogram block has a volume of two cubic feet.

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answers: Gravity acts only between objects that are touching.

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answers: Saturn

answers: NDQ_017286

answers: It will always have the same mass.

answers: NDQ_017290

answers: Its mass multiplied by the gravitational field strength

text: The BICEP2 experiment detected what was initially thought to be primordial B-mode polarization caused by gravitational waves in the early universe. If truly primordial, these waves were born as quantum fluctuations in gravity itself. Cosmologist Ken Olum (Tufts University) stated: "I think this is the only observational evidence that we have that actually shows that gravity is quantized....It's probably the only evidence of this that we will ever have."

text: The

text: BICEP2 experiment

text: detected what was initially thought to be primordial

text: B-mode polarization

text: caused by

text: gravitational wave

text: s in the early universe. If truly primordial, these waves were born as quantum fluctuations in gravity itself. Cosmologist Ken Olum (Tufts University) stated: "I think this is the only observational evidence that we have that actually shows that gravity is quantized....It's probably the only evidence of this that we will ever have."

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answers: Gravity is quantized

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answers: distance

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answers: Gravity

answers: NDQ_017290

answers: Gravity is quantized

text: In the first situation the beam experiences two forces: the weight of gravity

text: In the first situation the beam experiences two forces: the weight of gravity

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answers: 3: The answer has limited relevance and completeness, with noticeable gaps or inaccuracies.

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answers: The beam experiences two forces

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answers: weight

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answers: beam

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answers: Gravity

answers: NDQ_017290

answers: The weight of gravity

text: Perhaps the simplest solution to the tautochrone problem is to note a direct relation between the angle of an incline and the gravity felt by a particle on the incline.  A particle on a 90° vertical incline feels the full effect of gravity, while a particle on a horizontal plane feels effectively no gravity.  At intermediate angles, the "virtual gravity" felt by the particle is g sin θ.  The first step is to find a "virtual gravity" that produces the desired behavior.

text: Perhaps the simplest solution to the tautochrone problem is to note a direct relation between the angle of an incline and the gravity felt by a particle on the incline.  A particle on a 90° vertical incline feels the full effect of gravity, while a particle on a horizontal plane feels effectively no gravity.  At intermediate angles, the "virtual gravity" felt by the particle is g sin θ.  The first step is to find a "virtual gravity" that produces the desired behavior.

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answers: At intermediate angles

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answers: angles

answers: NDQ_017284

answers: A particle on a 90° vertical incline

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity

text: The effect of centrifugal force in countering gravity, as in this behavior of the tides, has led centrifugal force sometimes to be called "false gravity" or "imitation gravity" or "quasi-gravity".

text: The effect of centrifugal force in countering gravity, as in this behavior of the tides, has led centrifugal force sometimes to be called "false gravity" or "imitation gravity" or "quasi-gravity".

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answers: It acts only between objects that are touching

answers: NDQ_017283

answers: density

answers: NDQ_017284

answers: tides

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity

text: Weight is commonly measured using one of two methods. A spring scale or hydraulic or pneumatic scale measures local weight, the local force of gravity on the object (strictly apparent weight force).  Since the local force of gravity can vary by up to 0.5% at different locations, spring scales will measure slightly different weights for the same object (the same mass) at different locations.  To standardize weights, scales are always calibrated to read the weight an object would have at a nominal standard gravity of 9.80665 m/s (approx. 32.174 ft/s).  However, this calibration is done at the factory.  When the scale is moved to another location on Earth, the force of gravity will be different, causing a slight error.  So to be highly accurate, and legal for commerce, spring scales must be re-calibrated at the location at which they will be used.

text: Weight is commonly measured using one of two methods. A

text: spring scale

text: or

text: hydraulic or pneumatic scale

text: measures local weight, the local

text: force

text: of

text: gravity

text: on the object (strictly

text: apparent weight force

text: ).  Since the local force of gravity can vary by up to 0.5% at different locations, spring scales will measure slightly different weights for the same object (the same mass) at different locations.  To standardize weights, scales are always calibrated to read the weight an object would have at a nominal

text: standard gravity

text: of 9.80665 m/s (approx. 32.174 ft/s).  However, this calibration is done at the factory.  When the scale is moved to another location on Earth, the force of gravity will be different, causing a slight error.  So to be highly accurate, and legal for commerce,

text: spring scale

text: s must be re-calibrated at the location at which they will be used.

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text: The quality of the oil from the lower pools is good and the gravity medium, at 24 to 38 API, while the oil from the tar sand is extremely heavy and of poor quality, with an extraordinarily high sulfur content – API gravity of 7, viscosity of 28,000 to 33,000 centipoise, and sulfur content of between 5 and 7.5 percent by weight.

text: The quality of the oil from the lower pools is good and the gravity medium, at 24 to 38

text: API

text: , while the oil from the tar sand is extremely heavy and of poor quality, with an extraordinarily high sulfur content – API gravity of 7, viscosity of 28,000 to 33,000

text: centipoise

text: , and sulfur content of between 5 and 7.5 percent by weight.

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text: For the gravity below the surface we have to apply the free-air correction as well as a double Bouguer correction. With the infinite slab model this is because moving the point of observation below the slab changes the gravity due to it to its opposite. Alternatively, we can consider a spherically symmetrical Earth and subtract from the mass of the Earth that of the shell outside the point of observation, because that does not cause gravity inside. This gives the same result.

text: For the gravity below the surface we have to apply the free-air correction as well as a double Bouguer correction. With the infinite slab model this is because moving the point of observation below the slab changes the gravity due to it to its opposite. Alternatively, we can consider a

text: spherically symmetrical Earth

text: and subtract from the mass of the Earth that of the shell outside the point of observation, because that does not cause gravity inside. This gives the same result.

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text: When spacecraft land on the Moon in the film, dust is shown billowing as it would in air, not moving in a sheet as it would in the vacuum of the Lunar surface, as can be seen in Apollo Moon landing footage. While on the Moon, all actors move as if in normal Earth gravity, not as they would in the 1/6 gravity of the Moon. Similarly, the behavior of Dave and Frank in the weightless pod bay is not fully consistent with a zero-G environment. Although the astronauts are wearing zero-G 'grip shoes' in order to walk normally, they are oddly leaning on the table while testing the AE-35 unit as if held down by gravity. Finally, in an environment with a radius as small as the main quarters, the simulated gravity would vary significantly from the center of the crew quarters to the 'floor', even varying between feet, waist, and head. The rotation speed of the crew quarters was meant to be only fast enough to generate an approximation of the Moon's gravity, not that of the Earth. However, Clarke felt this was enough to prevent the physical atrophy that would result from complete weightlessness.

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text: In a subsequent paper from 2006 Bilson-Thompson, Fotini Markopolou, and Lee Smolin suggested that in any of a class of quantum gravity theories similar to loop quantum gravity in which spacetime comes in discrete chunks, excitations of spacetime itself may play the role of preons, and give rise to the standard model of particle physics as an emergent property of the quantum gravity theory.

text: In a subsequent paper from 2006 Bilson-Thompson,

text: Fotini Markopolou

text: , and

text: Lee Smolin

text: suggested that in any of a class of

text: quantum gravity

text: theories similar to

text: loop quantum gravity

text: in which

text: spacetime

text: comes in discrete chunks, excitations of spacetime itself may play the role of preons, and give rise to the standard model of particle physics as an emergent property of the quantum gravity theory.

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answers: Markopolou

text: European Combined Geodetic Network (ECGN) is a research project aimed at high accuracy geoid determination. The purpose of ECGN is to connect the height systems obtained via geometric positioning by GNSS with gravity-referenced heights with a cm-level accuracy. The effects of the atmosphere, the oceans and time-dependent parameters of the solid Earth on the gravity field are investigated. ECGN uses the data of satellite gravity missions CHAMP, GRACE and GOCE to model the Earth's gravity field and is linked to other gravity-related projects (GMES, GEOSS, GGOS). The ECGN is considered as a European contribution to the International Association of Geodesy (IAG) project Global Geodetic Observation System (GGOS). ECGN is managed by EUREF.

text: European Combined Geodetic Network (ECGN) is a research project aimed at high accuracy

text: geoid

text: determination. The purpose of ECGN is to connect the height systems obtained via geometric positioning by

text: GNSS

text: with

text: gravity

text: -referenced heights with a cm-level accuracy. The effects of the

text: atmosphere

text: , the

text: ocean

text: s and time-dependent parameters of the solid

text: Earth

text: on the

text: gravity

text: field are investigated. ECGN uses the data of satellite

text: gravity

text: missions

text: CHAMP

text: GRACE

text: and

entity_name: Gravity Field and Steady-State Ocean Circulation Explorer

text: GOCE

text: to model the

text: Earth

text: 's

text: gravity

text: field and is linked to other

text: gravity

text: -related projects (

text: GMES

entity_name: Global Earth Observation System of Systems

text: GEOSS

text: GGOS

text: ). The ECGN is considered as a

text: Europe

text: an contribution to the

text: International Association of Geodesy

text: (IAG) project

text: Global Geodetic Observation System

text: (GGOS). ECGN is managed by

entity_name: Regional Reference Frame Sub-Commission for Europe

text: EUREF

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answers: Gravity

text: Theories of everything, which integrate GUTs with a quantum gravity theory face a greater barrier, because no quantum gravity theories, which include string theory, loop quantum gravity, and twistor theory, have secured wide acceptance. Some theories look for a graviton to complete the Standard Model list of force-carrying particles, while others, like loop quantum gravity, emphasize the possibility that time-space itself may have a quantum aspect to it.

text: Theories of everything, which integrate GUTs with a quantum gravity theory face a greater barrier, because no quantum gravity theories, which include

text: string theory

text: loop quantum gravity

text: , and

text: twistor theory

text: , have secured wide acceptance. Some theories look for a graviton to complete the Standard Model list of force-carrying particles, while others, like loop quantum gravity, emphasize the possibility that time-space itself may have a quantum aspect to it.

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answers: no quantum gravity theories

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answers: force

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answers: graviton

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity

text: The Hatsuharu-class destroyers were designed to accompany the Japanese main striking force and to conduct both day and night torpedo attacks against the United States Navy as it advanced across the Pacific Ocean, according to Japan's naval strategic projections. They were to be armed much as the Fubuki class despite displacing only 1400 tons compared to the 1700 tons of the earlier destroyers. Furthermore, their fire control systems were to be more modern than the older systems and suitable for anti-aircraft use. This required the gun turrets to be modified for high-angle fire, which also meant more powerful motors to traverse and elevate the guns more quickly to engage high-speed aircraft. The torpedo launchers were to be given a protective shield to allow for use in heavy weather and to protect against splinter damage. And the Hatsuharu vessels were to be fitted with modern, enclosed command spaces protected against strafing aircraft. These requirements could only be met by adding weight high up on the ship and increased the ship's center of gravity. The only way to adhere to the allotted displacement was to try to reduce the weight of the hull and other equipment below the waterline as much as possible. But this put the ship's designers in a no-win situation as any reduction of weight below the waterline further raised the ship's center of gravity and reduced her stability.

text: The Hatsuharu-class destroyers were designed to accompany the Japanese main striking force and to conduct both day and night

text: torpedo

text: attacks against the

text: United States Navy

text: as it advanced across the

text: Pacific Ocean

text: , according to Japan's naval strategic projections. They were to be armed much as the Fubuki class despite displacing only 1400 tons compared to the 1700 tons of the earlier destroyers. Furthermore, their fire control systems were to be more modern than the older systems and suitable for

text: anti-aircraft

text: use. This required the

text: gun turret

text: s to be modified for high-angle fire, which also meant more powerful motors to traverse and elevate the guns more quickly to engage high-speed aircraft. The

text: torpedo launcher

text: s were to be given a protective shield to allow for use in heavy weather and to protect against splinter damage. And the Hatsuharu vessels were to be fitted with modern, enclosed command spaces protected against

text: strafing

text: aircraft. These requirements could only be met by adding weight high up on the ship and increased the ship's

text: center of gravity

text: . The only way to adhere to the allotted displacement was to try to reduce the weight of the hull and other equipment below the

text: waterline

text: as much as possible. But this put the ship's designers in a

text: no-win situation

text: as any reduction of weight below the waterline further raised the ship's

text: center of gravity

text: and reduced her stability.

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answers: center of gravity

text: The size, shape, minimum weight, and center of gravity of the javelin are all defined by IAAF rules. In international competition, men throw a javelin between  in length and  in weight, and women throw a javelin between  in length and  in weight. The javelin has a grip, about  wide, made of cord and located at the javelin's center of gravity ( from the javelin tip for the men's javelin and  from the javelin tip for the women's javelin).

text: The size, shape, minimum weight, and center of gravity of the javelin are all defined by

entity_name: International Association of Athletics Federations

text: IAAF

text: rules. In international competition, men throw a javelin between  in length and  in weight, and women throw a javelin between  in length and  in weight. The javelin has a grip, about  wide, made of cord and located at the javelin's center of gravity ( from the javelin tip for the men's javelin and  from the javelin tip for the women's javelin).

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answers: It acts between objects that are touching

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answers: Gravity

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answers: weight

text: Anti-gravity is a hypothetical force that eliminates the effects of gravity on an object (as opposed to counteracting it).  The MythBusters tested various devices that claimed to produce anti-gravity.

text: Anti-gravity

text: is a hypothetical force that eliminates the effects of gravity on an object (as opposed to counteracting it).  The MythBusters tested various devices that claimed to produce anti-gravity.

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answers: Gravity acts only between objects that are touching

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answers: Gravity

text: A perfect sphere of uniform density, or whose density varies solely with distance from the centre (spherical symmetry), would produce a gravitational field of uniform magnitude at all points on its surface, always pointing directly towards the sphere's centre. The Earth is not a perfect sphere, but is slightly flatter at the poles while bulging at the Equator: an oblate spheroid. There are consequently slight deviations in both the magnitude and direction of gravity across its surface.  The net force (or corresponding net acceleration) as measured by a scale and plumb bob is called "effective gravity" or "apparent gravity".  Effective gravity includes other factors that affect the net force.  These factors vary and include things such as centrifugal force at the surface from the Earth's rotation and the gravitational pull of the Moon and Sun.

text: A perfect

text: sphere

text: of uniform density, or whose density varies solely with distance from the centre (

text: spherical symmetry

text: ), would produce a gravitational field of uniform magnitude at all points on its

text: surface

text: , always pointing directly towards the sphere's centre. The Earth is not a perfect sphere, but is slightly flatter at the poles while bulging at the Equator: an

text: oblate spheroid

text: . There are consequently slight deviations in both the magnitude and direction of gravity across its surface.  The

text: net force

text: (or corresponding net acceleration) as measured by a scale and

text: plumb bob

text: is called "effective gravity" or "apparent gravity".  Effective gravity includes other factors that affect the net force.  These factors vary and include things such as centrifugal force at the surface from the Earth's rotation and the gravitational pull of the Moon and Sun.

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answers: It acts only between objects that are touching

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answers: distance from the centre

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answers: the Sun

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answers: The Earth is not a perfect sphere

answers: NDQ_017290

answers: scale

text: Earth's surface is situated fairly deep in a gravity well. The escape velocity required to get out of it is 11.2 kilometers/second. As human beings evolved in a gravitational field of 1g (9.8 m/s²), an ideal propulsion system would be one that provides a continuous acceleration of 1g (though human bodies can tolerate much larger accelerations over short periods). The occupants of a rocket or spaceship having such a propulsion system would be free from all the ill effects of free fall, such as nausea, muscular weakness, reduced sense of taste, or leaching of calcium from their bones.

text: Earth's surface is situated fairly deep in a

text: gravity well

text: . The

text: escape velocity

text: required to get out of it is 11.2 kilometers/second. As human beings evolved in a gravitational field of 1g (9.8 m/s²), an ideal propulsion system would be one that provides a continuous acceleration of 1g (though human bodies can tolerate much larger accelerations over short periods). The occupants of a rocket or spaceship having such a propulsion system would be free from all the ill effects of

text: free fall

text: , such as nausea, muscular weakness, reduced sense of taste, or

text: leaching

text: of calcium from their bones.

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text: Stammwürze (German for "original wort") is a type of measurement in brewing that is used to express the amount of extract (including sugars, dextrins, proteins, and minerals) in the pitched wort. It is closely related to gravity and is expressed as a weight percentage.

text: Stammwürze (

text: German

text: for "original wort") is a type of measurement in

text: brewing

text: that is used to express the amount of extract (including

text: sugar

text: s,

text: dextrins

text: proteins

text: , and

text: minerals

text: ) in the pitched

text: wort

text: . It is closely related to

text: gravity

text: and is expressed as a weight percentage.

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text: The low gravity of Europa may also present challenges to colonization efforts. The effects of low gravity on human health are still an active field of study, but can include symptoms such as loss of bone density, loss of muscle density, and a weakened immune system. Astronauts in Earth orbit have remained in microgravity for up to a year and more at a time. Effective countermeasures for the negative effects of low gravity are well-established, particularly an aggressive regimen of daily physical exercise. The variation in the negative effects of low gravity as a function of different levels of low gravity are not known, since all research in this area is restricted to humans in zero gravity. The same goes for the potential effects of low gravity on fetal and pediatric development. It has been hypothesized that children born and raised in low gravity would not be well adapted for life under the higher gravity of Earth.

text: The low gravity of Europa may also present challenges to colonization efforts. The

text: effects of low gravity on human health

text: are still an active field of study, but can include symptoms such as loss of

text: bone density

text: , loss of muscle density, and a weakened

text: immune system

text: Astronaut

text: s in Earth orbit have remained in microgravity for up to a year and more at a time. Effective countermeasures for the negative effects of low gravity are well-established, particularly an aggressive regimen of daily physical exercise. The variation in the negative effects of low gravity as a function of different levels of low gravity are not known, since all research in this area is restricted to humans in zero gravity. The same goes for the potential effects of low gravity on

text: fetal

text: and pediatric development. It has been hypothesized that children born and raised in low gravity would not be well adapted for life under the higher gravity of Earth.

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text: Exomedicine is the study and exploration of medical solutions in the zero gravity environment of space to promote benefits to human health on Earth. The purpose is to advance the field, study, and practice of medicine on Earth through research investigations conducted in the microgravity conditions of space which may provide advances in understanding that cannot be achieved on Earth. Although the Soviet Union launched the first space station, Salyut 1 in 1971, the United States designed and launched Skylab with the intent of advancing the field of science both in space and with regards to terrestrial applications. Beginning as a “memorandum of understanding” between NASA and ESA in 1973, the first major microgravity experiments in space were carried out by “Spacelab”. Gravity is a fundamental force on earth that influences all biological systems at a molecular level. When biomedical research is conducted in Space, in so-called microgravity environments, certain earthbound limitations disappear, new and different findings are made, and living organisms behave very differently.

text: Exomedicine is the study and exploration of medical solutions in the

text: zero gravity

text: environment of space to promote benefits to human health on Earth. The purpose is to advance the field, study, and practice of medicine on Earth through research investigations conducted in the

text: microgravity

text: conditions of space which may provide advances in understanding that cannot be achieved on Earth. Although the Soviet Union launched the first

text: space station

text: Salyut 1

text: in 1971, the United States designed and launched

text: Skylab

text: with the intent of advancing the field of science both in space and with regards to terrestrial applications. Beginning as a “memorandum of understanding” between

text: NASA

text: and

text: ESA

text: in 1973, the first major microgravity experiments in space were carried out by “Spacelab”.

text: Gravity

text: is a fundamental force on earth that influences all biological systems at a molecular level. When biomedical research is conducted in Space, in so-called microgravity environments, certain earthbound limitations disappear, new and different findings are made, and living organisms behave very differently.

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answers: Gravity

text: Further complications in elucidating the various concepts of weight have to do with the theory of relativity according to which gravity is modelled as a consequence of the curvature of spacetime. In the teaching community, a considerable debate has existed for over half a century on how to define weight for their students. The current situation is that a multiple set of concepts co-exist and find use in their various contexts.

text: Further complications in elucidating the various concepts of weight have to do with the

text: theory of relativity

text: according to which gravity is modelled as a consequence of the

text: curvature

text: of

text: spacetime

text: . In the teaching community, a considerable debate has existed for over half a century on how to define weight for their students. The current situation is that a multiple set of concepts co-exist and find use in their various contexts.

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answers: Gravity acts only between objects that are touching

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answers: In the teaching community

text: Gravity and lung’s weight act on ventilation by increasing pleural pressure at the base (making it less negative) and thus reducing the alveolar volume. The lowest part of the lung in relation to gravity is called the dependent region. At the dependent region smaller volumes mean the alveoli are more compliant (more distensible) and so capable of wider oxygen exchanges with the external environment. The apex, though showing a higher oxygen partial pressure, ventilates less efficiently since its compliance is lower and so smaller volumes are exchanged.

text: Gravity and lung’s weight act on ventilation by increasing pleural pressure at the base (making it less negative) and thus reducing the alveolar volume. The lowest part of the lung in relation to gravity is called the dependent region. At the dependent region smaller volumes mean the alveoli are more

text: compliant

text: (more distensible) and so capable of wider oxygen exchanges with the external environment. The apex, though showing a higher oxygen partial pressure, ventilates less efficiently since its compliance is lower and so smaller volumes are exchanged.

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text: Another way to describe specific strength is breaking length, also known as self support length: the maximum length of a vertical column of the material (assuming a fixed cross-section) that could suspend its own weight when supported only at the top. For this measurement, the definition of weight is the force of gravity at the Earth's surface (standard gravity, 9.80665 m/s) applying to the entire length of the material, not diminishing with height. This usage is more common with certain specialty fiber or textile applications.

text: Another way to describe specific strength is breaking length, also known as self support length: the maximum length of a vertical column of the material (assuming a fixed cross-section) that could suspend its own weight when supported only at the top. For this measurement, the definition of

text: weight

text: is the force of

text: gravity

text: at the Earth's surface (

text: standard gravity

text: , 9.80665 m/s) applying to the entire length of the material, not diminishing with height. This usage is more common with certain specialty fiber or textile applications.

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answers: applied to the entire length of the material

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answers: For this measurement, the definition of weight is the force of gravity

text: Many believe that physiological adaptation to Mars gravity (0.38 G) and re-adaptation to Earth gravity (1 G) would be enhanced by frequent exposure to artificial gravity on board the spacecraft en route to and from Mars. This would require an on-board human-rated centrifuge or spacecraft rotation to produce a centrifugal force similar to gravity. This solution, while potentially effective, raises a number of operational, engineering, and physiological issues that will need to be addressed. The human physiological responses to long-duration exposure to anything other than zero-gravity or Earth's gravity are unknown. Research is needed to identify the minimum level, duration, and frequency of gravity level required to maintain normal CNS functions, as well as the importance of a gravity gradient across the body.

text: Many believe that physiological adaptation to Mars gravity (0.38 G) and re-adaptation to Earth gravity (1 G) would be enhanced by frequent exposure to

text: artificial gravity

text: on board the spacecraft en route to and from Mars. This would require an on-board human-rated

text: centrifuge

text: or spacecraft rotation to produce a

text: centrifugal force

text: similar to gravity. This solution, while potentially effective, raises a number of operational, engineering, and physiological issues that will need to be addressed. The human physiological responses to long-duration exposure to anything other than zero-gravity or Earth's gravity are unknown. Research is needed to identify the minimum level, duration, and frequency of gravity level required to maintain normal CNS functions, as well as the importance of a

text: gravity gradient

text: across the body.

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answers: Gravity

text: The most positive comments about the papers themselves came from string theorist Luboš Motl. Writing in his blog almost three years after the heyday of the controversy, Motl stated, "The Bogdanoff brothers are proposing something that has, speculatively, the potential to be an alternative story about quantum gravity ... What they are proposing is a potential new calculational framework for gravity. I find it unlikely that these things will work but it is probably more likely than loop quantum gravity and other discrete approaches whose lethal problems have already been identified in detail".

text: The most positive comments about the papers themselves came from

text: string theorist

text: Luboš Motl

text: . Writing in his

text: blog

text: almost three years after the heyday of the controversy, Motl stated, "The Bogdanoff brothers are proposing something that has, speculatively, the potential to be an alternative story about quantum gravity ... What they are proposing is a potential new calculational framework for gravity. I find it unlikely that these things will work but it is probably more likely than loop quantum gravity and other discrete approaches whose lethal problems have already been identified in detail".

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answers: Loop quantum gravity and other discrete approaches

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answers: Gravity

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answers: Motl

text: The amount of gravitational potential energy possessed by an elevated object is equal to the work done against gravity in lifting it. The work done equals the force required to move it upward multiplied with the vertical distance it is moved (remember W = Fd). The upward force required while moving at a constant velocity is equal to the weight, mg, of an object, so the work done in lifting it through a height h is the product mgh. Thus, when accounting only for mass, gravity, and altitude, the equation is:

text: The amount of gravitational potential energy possessed by an elevated object is equal to the work done against gravity in lifting it. The work done equals the force required to move it upward multiplied with the vertical distance it is moved (remember W = Fd). The upward force required while moving at a constant velocity is equal to the weight, mg, of an object, so the work done in lifting it through a height h is the product mgh. Thus, when accounting only for

text: mass

text: gravity

text: , and

text: altitude

text: , the equation is:

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answers: It acts between objects that are touching

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answers: Gravity

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answers: mass

text: If the Moon just revolved around the Earth, there would be no way to tell what fraction of the Moon's or the Earth's gravity was caused by each form of mass, since only the total can be measured. However, the orbit of the Moon is also strongly affected by the gravity of the sun—in essence, Earth and Moon are in freefall around the sun. If the energy portion of mass behaves differently from the conventional portion, then the Earth and the Moon will fall differently toward the Sun, and the orbit of the Moon around the Earth will be affected. For example, suppose the energy part of the mass does affect gravity, but does not affect inertia. Then:

text: If the Moon just revolved around the Earth, there would be no way to tell what fraction of the Moon's or the Earth's gravity was caused by each form of mass, since only the total can be measured. However, the orbit of the Moon is also strongly affected by the gravity of the sun—in essence, Earth and Moon are in freefall around the sun. If the energy portion of mass behaves differently from the conventional portion, then the Earth and the Moon will fall differently toward the Sun, and the orbit of the Moon around the Earth will be affected. For example, suppose the energy part of the mass does affect gravity, but does not affect inertia. Then:

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answers: only the total can be measured

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answers: gravity acts only between objects that are touching

answers: NDQ_017283

answers: mass

answers: NDQ_017284

answers: the Sun

answers: NDQ_017286

answers: Earth and Moon are in freefall around the sun

answers: NDQ_017290

answers: only the total can be measured

text: Specific gravity is measured by comparing the weight of the gem in air with the weight of the gem suspended in water.

text: Specific gravity is measured by comparing the weight of the gem in air with the weight of the gem suspended in water.

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answers: It doesn't

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answers: gem suspended in water

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answers: Yes

answers: NDQ_017290

answers: Specific gravity

text: At a distance relatively close to Earth (less than 3000 km), gravity is only slightly reduced. As an object orbits a body such as the Earth, gravity is still attracting objects towards the Earth and the object is accelerated downward at almost 1g. Because the objects are typically moving laterally with respect to the surface at such immense speeds, the object will not lose altitude because of the curvature of the Earth. When viewed from an orbiting observer, other close objects in space appear to be floating because everything is being pulled towards Earth at the same speed, but also moving forward as the Earth's surface "falls" away below. All these objects are in free fall, not zero gravity.

text: At a distance relatively close to Earth (less than 3000 km), gravity is only slightly reduced. As an object orbits a body such as the Earth, gravity is still attracting objects towards the Earth and the object is accelerated downward at almost 1g. Because the objects are typically moving laterally with respect to the surface at such immense speeds, the object will not lose altitude because of the curvature of the Earth. When viewed from an orbiting observer, other close objects in space appear to be floating because everything is being pulled towards Earth at the same speed, but also moving forward as the Earth's surface "falls" away below. All these objects are in free fall, not zero gravity.

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answers: At a distance relatively close to Earth

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answers: distance

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answers: Earth

answers: NDQ_017286

answers: All these objects are in free fall

answers: NDQ_017290

answers: The object is accelerated downward at almost 1g

text: The planet's mass has been estimated to be 8.65 times that of Jupiter, while its diameter, at , is 0.951 times Jupiter's. Its small size, despite the bloating of the planet's atmosphere, is caused by the strong gravity of the planet. This indicates its mean density is twice that of Earth and its surface gravity approximately 24 times that on Earth, almost equal to the Sun. The orbit is very eccentric, ranging from 4.90 million to 15.36 million miles from the star.

text: The planet's mass has been estimated to be 8.65 times that of

text: Jupiter

text: , while its diameter, at , is 0.951 times Jupiter's. Its small size, despite the bloating of the planet's

text: atmosphere

text: , is caused by the strong gravity of the planet. This indicates its mean density is twice that of Earth and its

text: surface gravity

text: approximately 24 times that on Earth, almost equal to the Sun. The orbit is very eccentric, ranging from 4.90 million to 15.36 million miles from the star.

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answers: Gravity acts only between objects that are touching

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answers: the Sun

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: mass

text: Confusion Hill is a roadside attraction in Piercy, California.  The attraction, which opened in 1949, includes what is dubbed as a "gravity house," a structure built to give the interior visitors tilt-induced optical illusions, similar to the perspective on a gravity hill.  Occupants experience the need to stand upright when they actually already are.

text: Confusion Hill is a

text: roadside attraction

text: in

text: Piercy, California

text: .  The attraction, which opened in 1949, includes what is dubbed as a "gravity house," a structure built to give the interior visitors tilt-induced

text: optical illusion

text: s, similar to the perspective on a

text: gravity hill

text: .  Occupants experience the need to stand upright when they actually already are.

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answers: Gravity acts only between objects that are touching

answers: NDQ_017283

answers: tilt

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answers: gravity hill

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity

text: A relatively simple way to get a first-order approximation of delta-v is based on the 'Patched Conic Approximation' technique. One must choose the one dominant gravitating body in each region of space through which the trajectory will pass, and to model only that body's effects in that region.  For instance, on a trajectory from the Earth to Mars, one would begin by considering only the Earth's gravity until the trajectory reaches a distance where the Earth's gravity no longer dominates that of the Sun.  The spacecraft would be given escape velocity to send it on its way to interplanetary space.  Next, one would consider only the Sun's gravity until the trajectory reaches the neighbourhood of Mars.  During this stage, the transfer orbit model is appropriate.  Finally, only Mars's gravity is considered during the final portion of the trajectory where Mars's gravity dominates the spacecraft's behaviour.  The spacecraft would approach Mars on a hyperbolic orbit, and a final retrograde burn would slow the spacecraft enough to be captured by Mars.

text: A relatively simple way to get a

text: first-order approximation

text: of delta-v is based on the 'Patched Conic Approximation' technique. One must choose the one dominant gravitating body in each region of space through which the trajectory will pass, and to model only that body's effects in that region.  For instance, on a trajectory from the Earth to Mars, one would begin by considering only the Earth's gravity until the trajectory reaches a distance where the Earth's gravity no longer dominates that of the Sun.  The spacecraft would be given

text: escape velocity

text: to send it on its way to interplanetary space.  Next, one would consider only the Sun's gravity until the trajectory reaches the neighbourhood of Mars.  During this stage, the transfer orbit model is appropriate.  Finally, only Mars's gravity is considered during the final portion of the trajectory where Mars's gravity dominates the spacecraft's behaviour.  The spacecraft would approach Mars on a hyperbolic orbit, and a final retrograde burn would slow the spacecraft enough to be captured by Mars.

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text: Real Measure gives us a new standpoint external to the different Measures being brought into relation with each other, this relation now designating the independent existence of an actual physical Something. This Something gains its Qualitative determination from the Quantitative (a) combination between two Measures immanent in it, i.e., volume and weight. One designates an inner Quality, in this case weight; the other designates an external Quality, in this case volume, the amount of space it takes up. Their combination gives us the ratio of weight to volume which is its specific gravity. The constant that results from this ratio is the inner characteristic Real Measure of the thing in question, but, taking the form as it does of a mere number, a Quantum, this constant is likewise subject to alteration, i.e., addition, subtraction, etc. Unlike mere Quantum, however, the Real Measure of a thing is inwardly determined, and so preserves itself somewhat in alteration. If two material things are combined, the dual Measures of the one are added to those of the other. The degree to which they exhibit self-preservation is registered in the internal Measure—weight in this case—which ends up being equal, after combination, to the sum of the original two Measures; the degree to which they exhibit Qualitative alteration is registered in the external Measure—space in this case—which does not necessarily result in a sum equal to its parts, but often in the case of material substances exhibits a diminution in overall volume.

text: Real Measure gives us a new standpoint external to the different Measures being brought into relation with each other, this relation now designating the independent existence of an actual physical Something. This Something gains its Qualitative determination from the Quantitative (a) combination between two Measures immanent in it, i.e.,

text: volume

text: and

text: weight

text: . One designates an inner Quality, in this case weight; the other designates an external Quality, in this case volume, the amount of space it takes up. Their combination gives us the ratio of weight to volume which is its

text: specific gravity

text: . The constant that results from this ratio is the inner characteristic Real Measure of the thing in question, but, taking the form as it does of a mere number, a Quantum, this constant is likewise subject to alteration, i.e., addition, subtraction, etc. Unlike mere Quantum, however, the Real Measure of a thing is inwardly determined, and so preserves itself somewhat in alteration. If two material things are combined, the dual Measures of the one are added to those of the other. The degree to which they exhibit self-preservation is registered in the internal Measure—weight in this case—which ends up being equal, after combination, to the sum of the original two Measures; the degree to which they exhibit Qualitative alteration is registered in the external Measure—space in this case—which does not necessarily result in a sum equal to its parts, but often in the case of material substances exhibits a diminution in overall volume.

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answers: Their combination gives us the ratio of weight to volume

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answers: It gives us the ratio of weight to volume

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answers: Their combination gives us the ratio of weight to volume which is its specific gravity

text: In partial weight transfer the center of gravity is shifted to project between the old and new support body part. In some dance moves, such as ball change, the force produced by pushing with the new supporting foot at the moment of the partial weight transfer makes it possible to lift the previous support foot for a short time, followed by the drop back onto the first supporting foot subject to the gravity force.

text: In partial weight transfer the center of gravity is shifted to project between the old and new support body part. In some dance moves, such as

text: ball change

text: , the force produced by pushing with the new supporting foot at the moment of the partial weight transfer makes it possible to lift the previous support foot for a short time, followed by the drop back onto the first supporting foot subject to the gravity force.

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answers: It acts only between objects that are touching.

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answers: Gravity

text: Vasa sank because it had very little initial stability, which can be thought of as resistance to heeling over under the force of wind or waves acting on the hull. The reason for this is that the distribution of mass in the hull structure and the ballast, guns, provisions, and other objects loaded on board puts too much weight too high in the ship. The center of gravity is too high, and so it takes very little force to make the ship heel over, and there is not enough righting moment, force trying to make the ship return to an upright position. The reason that the ship has such a high center of gravity is not due to the guns. These weighed little over 60 tons, or about 5% of the total displacement of the loaded ship. This is relatively low weight and should be bearable in a ship this size. The problem is in the hull construction itself. The part of the hull above the waterline is too high and too heavily built in relation to the amount of hull in the water. The headroom in the decks is higher than necessary for crewmen who were, on average, only 1.67 meters (5 feet 5½ inches) tall, and thus the weight of the decks and the guns they carry is higher above the waterline than needed. In addition, the deck beams and their supporting timbers are over-dimensioned and too closely spaced for the loads they carry, so they contribute too much weight to the already tall and heavy upper works.

text: Vasa sank because it had very little

text: initial stability

text: , which can be thought of as resistance to heeling over under the force of wind or waves acting on the hull. The reason for this is that the distribution of mass in the hull structure and the ballast, guns, provisions, and other objects loaded on board puts too much weight too high in the ship. The

text: center of gravity

text: is too high, and so it takes very little force to make the ship heel over, and there is not enough

text: righting moment

text: , force trying to make the ship return to an upright position. The reason that the ship has such a high center of gravity is not due to the guns. These weighed little over 60 tons, or about 5% of the total displacement of the loaded ship. This is relatively low weight and should be bearable in a ship this size. The problem is in the hull construction itself. The part of the hull above the waterline is too high and too heavily built in relation to the amount of hull in the water. The headroom in the decks is higher than necessary for crewmen who were, on average, only 1.67 meters (5 feet 5½ inches) tall, and thus the weight of the decks and the guns they carry is higher above the waterline than needed. In addition, the deck beams and their supporting timbers are over-dimensioned and too closely spaced for the loads they carry, so they contribute too much weight to the already tall and heavy upper works.

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answers: center of gravity

text: When a person consumes alcohol, the alcohol is carried by the bloodstream and diffused into the water compartments of the body.  Normally, the specific gravity of a canal membrane is the same as the specific gravity of the surrounding fluid.  Because of this, even though the Earth's gravity is a constant force of acceleration, the semicircular canals do not respond to it.  Alcohol has a lighter specific gravity than water.  When alcohol enters the canal membrane via capillaries, the specific gravity of the membrane is lower than that of the surrounding fluid.  The alcohol does diffuse from the membrane to the fluid, but it does so very slowly.  While the specific gravity of the membrane is lower than the specific gravity of the extracellular fluid, the hair cells on the membrane become responsive to the Earth's gravity.  This is the condition of PAN I.

text: When a person consumes alcohol, the alcohol is carried by the bloodstream and diffused into the water compartments of the body.  Normally, the specific gravity of a canal membrane is the same as the specific gravity of the surrounding fluid.  Because of this, even though the Earth's gravity is a constant force of acceleration, the semicircular canals do not respond to it.  Alcohol has a lighter specific gravity than water.  When alcohol enters the canal membrane via

text: capillaries

text: , the specific gravity of the membrane is lower than that of the surrounding fluid.  The alcohol does diffuse from the membrane to the fluid, but it does so very slowly.  While the specific gravity of the membrane is lower than the specific gravity of the extracellular fluid, the hair cells on the membrane become responsive to the Earth's gravity.  This is the condition of PAN I.

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answers: Gravity acts only between objects that are touching.

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answers: Gravity

text: For example, when a pen falls off a desk, that seems to be proof that gravity exists, because gravity made it fall. But what is "gravity"?  In 1500, "gravity" was the pen's desire to go to the center of the earth; in 1700 "gravity" was a force that acted at a distance according to mathematical laws; in the 1900s "gravity" was an effect of curved space-time; and today physicists theorize that "gravity" may be a force carried by subatomic particles called "gravitons". Gendlin views "gravity" as a concept and points out that concepts can't make anything fall. Instead of saying that gravity causes things to fall, it would be more accurate to say that things falling cause [the different concepts of] gravity. Interaction with the world is prior to concepts about the world.

text: For example, when a pen falls off a desk, that seems to be proof that gravity exists, because gravity made it fall. But what is "gravity"?  In 1500, "gravity" was the pen's desire to go to the center of the earth; in 1700 "gravity" was a force that acted at a distance according to mathematical laws; in the 1900s "gravity" was an effect of

text: curved space-time

text: ; and today physicists theorize that "gravity" may be a force carried by subatomic particles called "

text: gravitons

text: ". Gendlin views "gravity" as a concept and points out that concepts can't make anything fall. Instead of saying that gravity causes things to fall, it would be more accurate to say that things falling cause [the different concepts of] gravity. Interaction with the world is prior to concepts about the world.

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answers: Gravity acts at a distance

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answers: Gravity

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answers: Gravity

text: A gravity anomaly is the difference between the observed acceleration of free fall, or gravity, on a planet's surface, and the corresponding value predicted from a model of the planet's gravity field. Typically the model is based on simplifying assumptions, such as that, under its self-gravitation and rotational motion, the planet assumes the figure of an ellipsoid of revolution. Gravity on the surface of this ellipsoid is then given by a simple formula which only contains the latitude, and subtraction from observed gravity in the same location will yield the gravity anomaly.

text: A gravity anomaly is the difference between the observed acceleration of free fall, or

text: gravity

text: , on a planet's surface, and the corresponding value predicted from a model of the planet's gravity field. Typically the model is based on simplifying assumptions, such as that, under its self-gravitation and rotational motion, the planet assumes the figure of an ellipsoid of revolution. Gravity on the surface of this ellipsoid is then given by a simple formula which only contains the latitude, and subtraction from observed gravity in the same location will yield the gravity anomaly.

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answers: Gravity on the surface

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answers: latitude

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: The album, Gravity Euphonic was described by the band's label as "laid-back angst-laden industrial rock".  The reviewers disagreed however, and called the album "solidly awesome without any pretence" while another said that Gravity Euphonic "lends an animalistic primevalness to what is usually a more refined and technological genre".

text: The album, Gravity Euphonic was described by the band's label as "laid-back angst-laden industrial rock".  The reviewers disagreed however, and called the album "solidly awesome without any pretence" while another said that Gravity Euphonic "lends an animalistic primevalness to what is usually a more refined and technological genre".

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text: The centers of gravity defined above are not fixed points on the body; rather, they change as the position and orientation of the body changes. This characteristic makes the center of gravity difficult to work with, so the concept has little practical use.

text: The centers of gravity defined above are not fixed points on the body; rather, they change as the position and orientation of the body changes. This characteristic makes the center of gravity difficult to work with, so the concept has little practical use.

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text: Bashir’s approach was not limited to this alone : he called for an efficient reorganiztion of the overseas Lebanese collectivities in the United States because, according to his views, they represented a non-negligible source of political and financial power. He suggested : “There is a vital necessity to reorganize the groups of Lebanese emigrants in a practical and modern manner, in order to create our own lobby, to promote the cause of our country in America. We cannot ignore the fact that the United States constitute the world’s center of gravity and that their influence in the Middle-East conflict is preponderant.” He stressed the importance of maintaining the best relations with the United States, particularly in Lebanon itself through the medium of U.S. Ambassador Philip Habib and the United States’ Embassy in Beirut. No effort must be neglected to enlist the active political support of the greatest nation in the world for the Lebanese cause. Bashir was confident that such good relations existed already:... “We entertain excellent relations with Philip Habib, with the United States’ Embassy in Beirut, and with the State Department in Washington through our offices abroad. We enjoy close relations with all the centers of power and gravity throughout the world.”

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answers: Gravity acts only between objects that are touching

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answers: We enjoy close relations with all the centers of power and gravity throughout the world

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answers: Gravity

text: The concept of "center of mass" in the form of the center of gravity was first introduced by the ancient Greek physicist, mathematician, and engineer Archimedes of Syracuse. He worked with simplified assumptions about gravity that amount to a uniform field, thus arriving at the mathematical properties of what we now call the center of mass. Archimedes showed that the torque exerted on a lever by weights resting at various points along the lever is the same as what it would be if all of the weights were moved to a single point—their center of mass. In work on floating bodies he demonstrated that the orientation of a floating object is the one that makes its center of mass as low as possible. He developed mathematical techniques for finding the centers of mass of objects of uniform density of various well-defined shapes.

text: The concept of "center of mass" in the form of the center of gravity was first introduced by the ancient Greek physicist, mathematician, and engineer

text: Archimedes of Syracuse

text: . He worked with simplified assumptions about gravity that amount to a uniform field, thus arriving at the mathematical properties of what we now call the center of mass. Archimedes showed that the

text: torque

text: exerted on a

text: lever

text: by weights resting at various points along the lever is the same as what it would be if all of the weights were moved to a single point—their center of mass. In work on floating bodies he demonstrated that the orientation of a floating object is the one that makes its center of mass as low as possible. He developed mathematical techniques for finding the centers of mass of objects of uniform density of various well-defined shapes.

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answers: NDQ_017290

answers: center of mass

text: Submerged specific gravity is equal to the specific gravity given by the ratio of the weight of the object to the weight of the fluid) minus one. That is, the object and fluid have the same density when the specific gravity equals one and the submerged specific gravity equals zero. This fact highlights the utility of the usage of submerged specific gravity in problems involving buoyancy and force balances on submerged objects: the object will naturally rise when its submerged specific gravity is negative, and sink when its submerged specific gravity is positive. Because of this characteristic and its dimensionless nature, submerged specific gravity is ubiquitous in equations of sediment transport.

text: Submerged specific gravity is equal to the specific gravity given by the ratio of the weight of the object to the weight of the fluid) minus one. That is, the object and fluid have the same density when the specific gravity equals one and the submerged specific gravity equals zero. This fact highlights the utility of the usage of submerged specific gravity in problems involving buoyancy and force balances on submerged objects: the object will naturally rise when its submerged specific gravity is negative, and sink when its submerged specific gravity is positive. Because of this characteristic and its dimensionless nature, submerged specific gravity is ubiquitous in equations of

text: sediment transport

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answers: It acts only between objects that are touching

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answers: weight

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answers: Because of this characteristic and its dimensionless nature

answers: NDQ_017290

answers: weight

text: In order for gravity spreading to occur, a rock mass must be driven to deformation by gravity. As long as the center of gravity of the system descends, portions of the system may rise. Of course, a material normally resists such deformation. In order for gravity spreading to occur, the differential stress must be greater than that rock body's yield strength. Gravity spreading can be thought of as a mound of molasses which spreads out, and gravity gliding can be imagined as a wooden block sliding down a slope.

text: In order for gravity spreading to occur, a rock mass must be driven to deformation by gravity. As long as the center of gravity of the system descends, portions of the system may rise. Of course, a material normally resists such deformation. In order for gravity spreading to occur, the

text: differential stress

text: must be greater than that rock body's

text: yield strength

text: . Gravity spreading can be thought of as a mound of molasses which spreads out, and gravity gliding can be imagined as a wooden block sliding down a slope.

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answers: It acts only between objects that are touching.

answers: NDQ_017283

answers: differential stress

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answers: mound of molasses

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: center of gravity

text: The novel is an elaborated version of his 1989 short story of the same title, Raft. The story follows a group of humans who have accidentally entered an alternate universe where the gravitational force is far stronger than our own, a "billion" times as strong. Planets do not exist, as they would immediately collapse under their own gravity; stars are only a mile across and have extremely brief life-spans, becoming cooled kernels a hundred yards wide with a surface gravity of five g. Human bodies possess a "respectable" gravity field in and of themselves. "Gravitic chemistry" also exists, where gravity is the dominant force on an atomic scale.

text: The novel is an elaborated version of his 1989 short story of the same title, Raft. The story follows a group of humans who have accidentally entered an

text: alternate universe

text: where the

text: gravitational force

text: is far stronger than our own, a "billion" times as strong. Planets do not exist, as they would immediately collapse under their own gravity; stars are only a mile across and have extremely brief life-spans, becoming cooled kernels a hundred yards wide with a surface gravity of five

text: g

text: . Human bodies possess a "respectable" gravity field in and of themselves. "Gravitic chemistry" also exists, where gravity is the dominant force on an atomic scale.

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answers: Gravity acts only between objects that are touching

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answers: Human bodies possess a "respectable" gravity field

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answers: Gravity

text: Based upon the size of the Earth and the force of gravity on its surface, the average density of the planet Earth is 5.515 g/cm, yet typical densities of surface rocks are only half that (about 2.75 g/cm). If any significant portion of the Earth were hollow, the average density would be much lower than that of surface rocks. The only way for Earth to have the force of gravity that it does is for much more dense material to make up a large part of the interior. Nickel-iron alloy under the conditions expected in a non-hollow Earth would have densities ranging from about 10 to 13 g/cm, which brings the average density of Earth to its observed value.

text: Based upon the size of the Earth and the force of gravity on its surface, the average density of the planet Earth is 5.515 g/cm, yet typical densities of surface rocks are only half that (about 2.75 g/cm). If any significant portion of the Earth were hollow, the average density would be much lower than that of surface rocks. The only way for Earth to have the force of gravity that it does is for much more dense material to make up a large part of the interior. Nickel-iron alloy under the conditions expected in a non-hollow Earth would have densities ranging from about 10 to 13 g/cm, which brings the average density of Earth to its observed value.

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: It is a common misconception that astronauts in orbit are weightless because they have flown high enough to escape the Earth's gravity. In fact, at an altitude of , equivalent to a typical orbit of the Space Shuttle, gravity is still nearly 90% as strong as at the Earth's surface. Weightlessness actually occurs because orbiting objects are in free-fall.

text: It is a common misconception that astronauts in orbit are weightless because they have flown high enough to escape the Earth's gravity. In fact, at an altitude of , equivalent to a typical orbit of the

text: Space Shuttle

text: , gravity is still nearly 90% as strong as at the Earth's surface. Weightlessness actually occurs because orbiting objects are in

text: free-fall

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text: His main work (since 1932) was on the figure of the Earth (the geoid) and her exterior gravity field or geopotential. His aim was to develop hypothesis-free methods for determining both the gravity field and defining vertical reference systems for large areas. As part of this work, he introduced normal heights, which can be calculated from geopotential numbers (obtained from precise levelling) without needing the uncertain value of gravity along the plumbline of a point, i.e., inside the continental crustal rock under the point.

text: His main work (since 1932) was on the figure of the Earth (the

text: geoid

text: ) and her exterior gravity field or

text: geopotential

text: . His aim was to develop

text: hypothesis

text: -free methods for determining both the gravity field and defining vertical reference systems for large areas. As part of this work, he introduced

text: normal height

text: s, which can be calculated from geopotential numbers (obtained from precise levelling) without needing the uncertain value of gravity along the plumbline of a point, i.e., inside the continental crustal rock under the point.

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answers: It does not

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answers: precise levelling

text: The acceleration due to gravity depends on the gravity of the mass, which rests inside of the object. The gravity decreases at longer distance between centers of mass. The acceleration due to gravity furthermore is influenced by the rotation of the earth. As centifugal force increases at longer earth's axis distance, thus centrifugal force is highest at the equator and lowest the poles.

text: The

text: acceleration due to gravity

text: depends on the

text: gravity

text: of the mass, which rests inside of the object. The gravity decreases at longer distance between centers of mass. The acceleration due to gravity furthermore is influenced by the rotation of the earth. As centifugal force increases at longer earth's axis distance, thus centrifugal force is highest at the equator and lowest the poles.

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answers: Gravity decreases at longer distance between centers of mass

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answers: Gravity

text: As specific gravity was the basis for the Balling, Brix and Plato tables, dissolved sugar content was originally estimated by measurement of specific gravity using a hydrometer or pycnometer. In modern times, hydrometers are still widely used, but where greater accuracy is required, an electronic oscillating U-tube meter may be employed. Whichever means are used, the analyst enters the tables with specific gravity and takes out (using interpolation if necessary) the sugar content in percent by mass. If the analyst uses the Plato tables (maintained by the American Society of Brewing Chemists) he or she reports in °P. If using the Brix table (the current version of which is maintained by NIST and can be found on their website), he or she reports in °Bx. If using the ICUMSA tables, he or she would report in mass fraction (m.f.). It is not, typically, actually necessary to consult tables as the tabulated °Bx or °P value can be printed directly on the hydrometer scale next to the tabulated value of specific gravity or stored in the memory of the electronic U-tube meter or calculated from polynomial fits to the tabulated data. Both ICUMSA and ASBC have published suitable polynomials; in fact, the ICUMSA tables are calculated from the polynomials. The opposite is true with the ASBC polynomial. Also note that the tables in use today are not those published by Brix or Plato. Those workers measured true specific gravity reference to water at 4 °C using, respectively, 17.5 °C and 20 °C, as the temperature at which the density of a sucrose solution be measured. Both NBS and ASBC converted to apparent specific gravity at 20 °C/20 °C. The ICUMSA tables are based on more recent measurements on sucrose, fructose, glucose and invert sugar, and they tabulate true density and weight in air at 20 °C against mass fraction.

text: As specific gravity was the basis for the Balling, Brix and Plato tables, dissolved sugar content was originally estimated by measurement of specific gravity using a

text: hydrometer

text: or

text: pycnometer

text: . In modern times, hydrometers are still widely used, but where greater accuracy is required, an electronic

text: oscillating U-tube

text: meter may be employed. Whichever means are used, the analyst enters the tables with specific gravity and takes out (using interpolation if necessary) the sugar content in

text: percent by mass

text: . If the analyst uses the Plato tables (maintained by the

text: American Society of Brewing Chemists

text: ) he or she reports in °P. If using the Brix table (the current version of which is maintained by NIST and can be found on their website), he or she reports in °Bx. If using the ICUMSA tables, he or she would report in mass fraction (m.f.). It is not, typically, actually necessary to consult tables as the tabulated °Bx or °P value can be printed directly on the hydrometer scale next to the tabulated value of specific gravity or stored in the memory of the electronic U-tube meter or calculated from polynomial fits to the tabulated data. Both ICUMSA and ASBC have published suitable polynomials; in fact, the ICUMSA tables are calculated from the polynomials. The opposite is true with the

text: ASBC

text: polynomial. Also note that the tables in use today are not those published by Brix or Plato. Those workers measured true specific gravity reference to water at 4 °C using, respectively, 17.5 °C and 20 °C, as the temperature at which the density of a sucrose solution be measured. Both NBS and ASBC converted to

text: apparent specific gravity

text: at 20 °C/20 °C. The ICUMSA tables are based on more recent measurements on sucrose, fructose, glucose and invert sugar, and they tabulate true density and weight in air at 20 °C against mass fraction.

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answers: 1: The answer has limited relevance and completeness, with noticeable gaps or inaccuracies.

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answers: mass fraction

text: For other situations, such as when objects are subjected to mechanical accelerations from forces other than the resistance of a planetary surface, the weight force is proportional to the mass of an object multiplied by the total acceleration away from free fall, which is called the proper acceleration. Through such mechanisms, objects in elevators, vehicles, centrifuges, and the like, may experience weight forces many times those caused by resistance to the effects of gravity on objects, resulting from planetary surfaces. In such cases, the generalized equation for weight W of an object is related to its mass m by the equation , where a is the proper acceleration of the object caused by all influences other than gravity. (Again, if gravity is the only influence, such as occurs when an object falls freely, its weight will be zero).

text: For other situations, such as when objects are subjected to mechanical accelerations from forces other than the resistance of a planetary surface, the weight force is proportional to the mass of an object multiplied by the total acceleration away from free fall, which is called the

text: proper acceleration

text: . Through such mechanisms, objects in elevators, vehicles, centrifuges, and the like, may experience weight forces many times those caused by resistance to the effects of gravity on objects, resulting from planetary surfaces. In such cases, the generalized equation for weight W of an object is related to its mass m by the equation , where a is the proper acceleration of the object caused by all influences other than gravity. (Again, if gravity is the only influence, such as occurs when an object falls freely, its weight will be zero).

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text: The gravitational effects of the Moon and the Sun (also the cause of the tides) have a very small effect on the apparent strength of Earth's gravity, depending on their relative positions; typical variations are 2 µm/s (0.2 mGal) over the course of a day.

text: The gravitational effects of the

text: Moon

text: and the

text: Sun

text: (also the cause of the

text: tide

text: s) have a very small effect on the apparent strength of Earth's gravity, depending on their relative positions; typical variations are 2 µm/s (0.2

text: mGal

text: ) over the course of a day.

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answers: mGal

text: The strength of a gravitational field varies with location. However, when the change of distance is small in relation to the distances from the center of the source of the gravitational field, this variation in field strength is negligible and we can assume that the force of gravity on a particular object is constant. Near the surface of the Earth, for example, we assume that the acceleration due to gravity is a constant  ("standard gravity"). In this case, a simple expression for gravitational potential energy can be derived using the W = Fd equation for work, and the equation

text: The strength of a gravitational field varies with location. However, when the change of distance is small in relation to the distances from the center of the source of the gravitational field, this variation in field strength is negligible and we can assume that the force of gravity on a particular object is constant. Near the surface of the Earth, for example, we assume that the acceleration due to gravity is a constant  ("

text: standard gravity

text: "). In this case, a simple expression for gravitational potential energy can be derived using the W = Fd equation for

text: work

text: , and the equation

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answers: NDQ_017290

answers: Gravity

text: Earth's gravity reaches out far past the Van Allen radiation belt and keeps the Moon in orbit at an average distance of . The region of space where the gravity of a planet tends to dominate the motion of objects in the presence of other perturbing bodies (such as another planet) is known as the Hill sphere. For Earth, this sphere has a radius of about .

text: Earth's gravity reaches out far past the

text: Van Allen radiation belt

text: and keeps the Moon in orbit at an average distance of . The region of space where the gravity of a planet tends to dominate the motion of objects in the presence of other perturbing bodies (such as another planet) is known as the

text: Hill sphere

text: . For Earth, this sphere has a radius of about .

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answers: NDQ_017290

answers: Gravity

text: The test is an assessment of the weight distribution and hence the position of the centre of gravity of the vehicle, and can be carried out in a laden or unladen state, i.e. with or without passengers or freight. The test can be applied to automobiles, trucks, buses and rail vehicles.

text: The test is an assessment of the

text: weight distribution

text: and hence the position of the

text: centre of gravity

text: of the vehicle, and can be carried out in a laden or unladen state, i.e. with or without passengers or freight. The test can be applied to

text: automobile

text: s,

text: truck

text: s,

text: bus

text: es and

text: rail vehicles

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answers: The test

text: A "stationary" micro-g environment would require travelling far enough into deep space so as to reduce the effect of gravity by attenuation to almost zero. This is the simplest in conception, but requires traveling an enormous distance, rendering it most impractical. For example, to reduce the gravity of the Earth by a factor of one million, one needs to be at a distance of 6 million kilometers from the Earth, but to reduce the gravity of the Sun to this amount one has to be at a distance of 3.7 billion kilometers. (The gravity due to the rest of the Milky Way is already smaller than one millionth of the gravity on Earth, so we do not need to move away further from its center). Thus it is not impossible, but it has only been achieved so far by four interstellar probes (Voyager 1 and 2, part of the Voyager program, Pioneer 10 and 11 part of the Pioneer program) and they did not return to Earth. To reduce the gravity to one thousandth of that on Earth's  surface, one needs to be at a distance of 200,000 km.

text: A "stationary" micro-g environment would require travelling far enough into deep space so as to reduce the effect of gravity by

text: attenuation

text: to almost zero. This is the simplest in conception, but requires traveling an enormous distance, rendering it most impractical. For example, to reduce the gravity of the Earth by a factor of one million, one needs to be at a distance of 6 million kilometers from the Earth, but to reduce the gravity of the Sun to this amount one has to be at a distance of 3.7 billion kilometers. (The gravity due to the rest of the

text: Milky Way

text: is already smaller than one millionth of the gravity on Earth, so we do not need to move away further from its

text: center

text: ). Thus it is not impossible, but it has only been achieved so far by four

text: interstellar probe

text: s (

text: Voyager 1

text: and

text: , part of the

text: Voyager program

text: Pioneer 10

text: and

text: part of the

text: Pioneer program

text: ) and they did not return to Earth. To reduce the gravity to one thousandth of that on Earth's  surface, one needs to be at a distance of 200,000 km.

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answers: Gravity acts only between objects that are touching

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answers: NDQ_017290

answers: Gravity

text: The equivalence between gravitational and inertial effects does not constitute a complete theory of gravity. When it comes to explaining gravity near our own location on the Earth's surface, noting that our reference frame is not in free fall, so that fictitious forces are to be expected, provides a suitable explanation. But a freely falling reference frame on one side of the Earth cannot explain why the people on the opposite side of the Earth experience a gravitational pull in the opposite direction.

text: The equivalence between gravitational and inertial effects does not constitute a complete theory of gravity. When it comes to explaining gravity near our own location on the Earth's surface, noting that our reference frame is not in free fall, so that

text: fictitious force

text: s are to be expected, provides a suitable explanation. But a freely falling reference frame on one side of the Earth cannot explain why the people on the opposite side of the Earth experience a gravitational pull in the opposite direction.

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text: The center of gravity of a transport aircraft is a function of a number of factors: the weight of the empty aircraft (the so-called "basic weight"), the weight of the fuel load (usually carried only in the wings), the weight of the cargo and passengers, and the weight of the crew, and the positions of each of these factors.  The weight of each of these factors is known before a flight.  What varies from flight to flight is not only the weight of any or all of these factors, but the position of such factors as fuel, passengers and cargo. The weight of each of these factors is converted into a "moment", by multiplying the weight of each item times its distance from a reference point which was established when the aircraft was designed.  The sum of all moments is then divided by the sum of all weights and the result is the "center of gravity" for the aircraft with crew, fuel, cargo and passengers aboard.  This center of gravity must be within a range specified by the designers. Furthermore, as fuel is burned off during flight the center of gravity changes continually, so that the aircraft becomes either more nose-heavy or more tail-heavy as the flight continues. This must be taken into account when the aircraft is loaded. An aircraft which was "within limits" on takeoff could, in the course of a flight, become "out of limits" because of fuel burnoff.

text: The center of gravity of a transport aircraft is a function of a number of factors: the weight of the empty aircraft (the so-called "basic weight"), the weight of the fuel load (usually carried only in the wings), the weight of the cargo and

text: passenger

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answers: The weight of each of these factors

text: Gravity later joins the Fifty State Initiative. After passing a leadership course, Gravity is made the leader of Nevada's Initiative team, the Heavy Hitters, where he is joined by Initiative graduates Hardball, Nonstop, and Telemetry.

text: Gravity later joins the

text: Fifty State Initiative

text: . After passing a leadership course, Gravity is made the leader of

text: Nevada

text: 's Initiative team, the

text: Heavy Hitters

text: , where he is joined by Initiative graduates

text: Hardball

text: , Nonstop, and Telemetry.

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text: Gravity Bone was developed by Brendon Chung under his video game studio Blendo Games. Chung, who worked as a level designer for Pandemic Studios, has contributed to the development of titles such as Full Spectrum Warrior and Lord of the Rings: Conquest. Four incarnations of Gravity Bone were produced during its one-year development. Chung commented during an interview with FidGit that "Gravity Bone started out very different from what it was and ended up getting scrapped ... so on and so forth until this version came out." The first version of Gravity Bone featured more typical first-person shooter elements than the released version, and was based on a series of Quake 2 maps entitled Citizen Abel. He elaborated that the first version of the game had the player running around with a gun, "shoot[ing] things and stuff explodes." Development shifted in a new direction, and Gravity Bone was transformed; the player would act as a computer hacker, "hacking stuff all the time."

text: Gravity Bone was developed by Brendon Chung under his video game studio

text: Blendo Games

text: . Chung, who worked as a

text: level designer

text: for

text: Pandemic Studios

text: , has contributed to the development of titles such as

text: Full Spectrum Warrior

text: and

text: Lord of the Rings: Conquest

text: . Four incarnations of Gravity Bone were produced during its one-year development. Chung commented during an interview with FidGit that "Gravity Bone started out very different from what it was and ended up getting scrapped ... so on and so forth until this version came out." The first version of Gravity Bone featured more typical first-person shooter elements than the released version, and was based on a series of

text: Quake 2

text: maps entitled Citizen Abel. He elaborated that the first version of the game had the player running around with a gun, "shoot[ing] things and stuff explodes." Development shifted in a new direction, and Gravity Bone was transformed; the player would act as a

text: computer hacker

text: , "hacking stuff all the time."

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answers: Gravity acts only between objects that are touching

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text: The introduction by Ashtekar of a new set of variables (Ashtekar variables) cast general relativity in the same language as gauge theories and allowed one to apply loop techniques as a natural nonperturbative description of Einstein’s theory. In canonical quantum gravity the difficulties in using the continuous loop representation are cured by the spatial diffeomorphism invariance of general relativity. The loop representation also provides a natural solution of the spatial diffeomorphism constraint, making a connection between canonical quantum gravity and knot theory. Surprisingly there were a class of loop states that provided exact (if only formal) solutions to Ashtekar's original (ill-defined) Wheeler–DeWitt equation. Hence an infinite set of exact (if only formal) solutions had been identified for all the equations of canonical quantum general gravity in this representation! This generated a lot of interest in the approach and eventually led to loop quantum gravity (LQG).

text: The introduction by

text: Ashtekar

text: of a new set of variables (

text: Ashtekar variables

text: ) cast general relativity in the same language as gauge theories and allowed one to apply loop techniques as a natural nonperturbative description of Einstein’s theory. In

text: canonical quantum gravity

text: the difficulties in using the continuous loop representation are cured by the spatial

text: diffeomorphism

text: invariance of

text: general relativity

text: . The loop representation also provides a natural solution of the spatial diffeomorphism constraint, making a connection between

text: canonical quantum gravity

text: and

text: knot theory

text: . Surprisingly there were a class of loop states that provided exact (if only formal) solutions to Ashtekar's original (ill-defined)

text: Wheeler–DeWitt equation

text: . Hence an infinite set of exact (if only formal) solutions had been identified for all the equations of canonical quantum general gravity in this representation! This generated a lot of interest in the approach and eventually led to

text: loop quantum gravity

text: (LQG).

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text: The official soundtrack of Lost Gravity, Move Up (Lost Gravity) by Mr. Polska, was released on . Lost Gravity opened on

text: The official soundtrack of Lost Gravity, Move Up (Lost Gravity) by Mr. Polska, was released on . Lost Gravity opened on

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answers: 2: The answer has limited relevance and completeness, with significant gaps or inaccuracy.

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answers: Gravity

text: Founded in March 2003, Gravity Interactive LLC was created to host games for North America developed by GRAVITY Co., Ltd.. It is based in Buena Park near Orange County, California. Gravity was initially provided with several servers from Gravity Co., and began beta testing of the International Ragnarok Online (iRO) service in 2003. Commercial service subsequently began on June 1, 2003. In 2005, Gravity also began hosting the North American version of ROSE Online (naROSE). On January 1, 2006, Gravity Interactive LLC became Gravity Interactive, Inc. In February 2008, Gravity began beta testing its third MMORPG, Requiem: Bloodymare. Around mid to late 2012 Gravity began beta testing its fourth MMORPG, Maestia: Rise Of Keledus. In April 2013, Gravity began beta testing the second title in the Ragnarok Online series. Ragnarok Online 2 was launched in May 2013 and also available on Steam.

text: Founded in March 2003, Gravity Interactive LLC was created to host games for

text: North America

text: developed by

text: GRAVITY Co., Ltd.

text: . It is based in

text: Buena Park

text: near

text: Orange County

text: California

text: . Gravity was initially provided with several

text: server

text: s from Gravity Co., and began

text: beta

text: testing of the International

text: Ragnarok Online

text: (iRO) service in 2003. Commercial service subsequently began on June 1, 2003. In 2005, Gravity also began hosting the North American version of

text: ROSE Online

text: (naROSE). On January 1, 2006, Gravity Interactive LLC became Gravity Interactive, Inc. In February 2008, Gravity began beta testing its third

entity_name: Massively multiplayer online role-playing game

text: MMORPG

text: Requiem: Bloodymare

text: . Around mid to late 2012 Gravity began beta testing its fourth

text: MMORPG

text: , Maestia: Rise Of Keledus. In April 2013, Gravity began beta testing the second title in the Ragnarok Online series.

text: Ragnarok Online 2

text: was launched in May 2013 and also available on

text: Steam

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answers: Gravity Interactive LLC

text: Kelgians, as indicated by the first letter "D" of their classification, are oxygen breathers whose normal gravity approximates the standard gravity of Earth.  Their atmosphere is an oxygen-nitrogen combination that also approximates Earth's.  They are herbivores, eating plants (such as crelletin vine shoots) by putting their face inside of their bowl.  They sleep in an "S" or a question mark pose in zero-gravity or, in regular gravity, on a bed.

text: Kelgians, as indicated by the first letter "D" of their classification, are oxygen breathers whose normal gravity approximates the

text: standard gravity

text: of Earth.  Their atmosphere is an oxygen-nitrogen combination that also approximates Earth's.  They are

text: herbivores

text: , eating plants (such as crelletin vine shoots) by putting their face inside of their bowl.  They sleep in an "S" or a question mark pose in zero-gravity or, in regular gravity, on a bed.

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answers: gravity acts only between objects that are touching

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answers: atmosphere

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answers: Earth

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answers: Gravity

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answers: Gravity

text: Gravity measurements became part of geodesy because they were needed to related measurements at the surface of the Earth to the reference coordinate system. Gravity measurements on land can be made using gravimeters deployed either on the surface or in helicopter flyovers. Since the 1960s, the Earth's gravity field has been measured by analyzing the motion of satellites. Sea level can also be measured by satellites using radar altimetry, contributing to a more accurate geoid. In 2002, NASA launched the Gravity Recovery and Climate Experiment (GRACE), wherein two twin satellites map variations in Earth's gravity field by making measurements of the distance between the two satellites using GPS and a microwave ranging system.  Gravity variations detected by GRACE include those caused by changes in ocean currents; runoff and ground water depletion; melting ice sheets and glaciers.

text: Gravity measurements became part of geodesy because they were needed to related measurements at the surface of the Earth to the reference coordinate system. Gravity measurements on land can be made using

text: gravimeters

text: deployed either on the surface or in helicopter flyovers. Since the 1960s, the Earth's gravity field has been measured by analyzing the motion of satellites. Sea level can also be measured by satellites using

text: radar altimetry

text: , contributing to a more accurate

text: geoid

text: . In 2002,

text: NASA

text: launched the

text: Gravity Recovery and Climate Experiment

text: (GRACE), wherein two twin satellites map variations in Earth's gravity field by making measurements of the distance between the two satellites using GPS and a microwave ranging system.  Gravity variations detected by GRACE include those caused by changes in ocean currents; runoff and ground water depletion; melting ice sheets and glaciers.

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answers: Gravity measurements

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answers: Gravity

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answers: Gravity measurements

text: Specific gravity numerically describes the density of a mineral. The dimensions of density are mass divided by volume with units: kg/m or g/cm. Specific gravity measures how much water a mineral sample displaces. Defined as the quotient of the mass of the sample and difference between the weight of the sample in air and its corresponding weight in water, specific gravity is a unitless ratio. Among most minerals, this property is not diagnostic. Rock forming minerals — typically silicates or occasionally carbonates — have a specific gravity of 2.5–3.5.

text: Specific gravity

text: numerically describes the

text: density

text: of a mineral. The dimensions of density are mass divided by volume with units: kg/m or g/cm. Specific gravity measures how much water a mineral sample displaces. Defined as the quotient of the mass of the sample and difference between the weight of the sample in air and its corresponding weight in water, specific gravity is a unitless ratio. Among most minerals, this property is not diagnostic. Rock forming minerals — typically silicates or occasionally carbonates — have a specific gravity of 2.5–3.5.

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answers: It is not diagnostic

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answers: density

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answers: carbonates

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answers: Specific gravity

answers: NDQ_017290

answers: weight of the sample in air

text: The standard acceleration due to gravity (or standard acceleration of free fall), sometimes abbreviated as standard gravity, usually denoted by  or , is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth. It is defined by standard as , which is exactly  (about , or ). This value was established by the 3rd CGPM (1901, CR 70) and used to define the standard weight of an object as the product of its mass and this nominal acceleration. The acceleration of a body near the surface of the Earth is due to the combined effects of gravity and centrifugal acceleration from rotation of the Earth (but which is small enough to be neglected for most purposes); the total (the apparent gravity) is about 0.5 percent greater at the poles than at the equator.

text: The standard acceleration due to gravity (or standard acceleration of free fall), sometimes abbreviated as standard gravity, usually denoted by  or , is the nominal

text: gravitational acceleration

text: of an object in a vacuum near the surface of the Earth. It is

text: defined by standard

text: as , which is exactly  (about , or ). This value was established by the 3rd

text: CGPM

text: (1901, CR 70) and used to define the standard

text: weight

text: of an object as the product of its mass and this nominal acceleration. The acceleration of a body near the surface of the Earth is due to the combined effects of

text: gravity

text: and

text: centrifugal acceleration

text: from rotation of the Earth (but which is small enough to be neglected for most purposes); the total (the apparent gravity) is about 0.5 percent greater at the poles than at the equator.

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answers: It is defined by standard as

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answers: mass

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answers: poles

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answers: Gravity

answers: NDQ_017290

answers: This value was established by the 3rd CGPM

text: The blue color is very diagnostic for this species. Glaucophane, along with the closely related mineral riebeckite, to which it forms a series with, and their intermediate crossite, are the only well known amphiboles that are commonly blue. Glaucophane forms a solid solution series with ferroglaucophane; Na(Fe,Mg)AlSiO(OH). Glaucophane is the magnesium-rich endmember and ferroglaucophane is the iron-rich endmember. Ferroglaucophane is similar to glaucophane but is slightly denser and hence increased specific gravity. The two endmembers are indistinguishable in hand specimens and are strongly pleochroic. Glaucophane's hardness is 5 - 6 and its specific gravity is approximately 3 - 3.2.

text: The blue color is very diagnostic for this species. Glaucophane, along with the closely related mineral

text: riebeckite

text: , to which it forms a series with, and their intermediate

text: crossite

text: , are the only well known

text: amphiboles

text: that are commonly blue. Glaucophane forms a

text: solid solution

text: series with

text: ferroglaucophane

text: ; Na(Fe,Mg)AlSiO(OH). Glaucophane is the

text: magnesium

text: -rich endmember and ferroglaucophane is the

text: iron

text: -rich endmember. Ferroglaucophane is similar to glaucophane but is slightly denser and hence increased

text: specific gravity

text: . The two endmembers are indistinguishable in hand specimens and are strongly

text: pleochroic

text: . Glaucophane's

text: hardness

text: is 5 - 6 and its specific gravity is approximately 3 - 3.2.

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answers: Gravity

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answers: specific gravity

text: In geophysics, the free-air gravity anomaly, often simply called the free-air anomaly, is the measured gravity anomaly after a free-air correction is applied to correct for the elevation at which a measurement is made. The free-air correction does so by adjusting these measurements of gravity to what would have been measured at a reference level.  For Earth, this reference level is commonly taken as the mean sea level.

text: In

text: geophysics

text: , the free-air gravity anomaly, often simply called the free-air anomaly, is the measured

text: gravity anomaly

text: after a free-air correction is applied to correct for the elevation at which a measurement is made. The free-air correction does so by adjusting these measurements of gravity to what would have been measured at a reference level.  For Earth, this reference level is commonly taken as the mean sea level.

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answers: Gravity

text: Einstein's general relativity is the simplest plausible theory of gravity that can be based on just one symmetric tensor field (the metric tensor). Others include: Starobinsky (R+R^2) gravity, Gauss–Bonnet gravity, f(R) gravity, and Lovelock theory of gravity.

text: Einstein's

text: general relativity

text: is the simplest plausible theory of gravity that can be based on just one symmetric tensor field (the

text: metric tensor

text: ). Others include: Starobinsky (R+R^2) gravity,

text: Gauss–Bonnet gravity

text: f(R) gravity

text: , and

text: Lovelock theory of gravity

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answers: It does not.

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answers: symmetry

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answers: f(R)

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answers: Gravity

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answers: f(R) gravity

text: In 1695 John Woodward An Essay Toward a Natural History of the Earth viewed the Genesis Flood as dissolving rocks and earth into a thick slurry which caught up all living things, and when the waters settled formed strata according to the specific gravity of these materials, including fossils of the organisms. When it was pointed out that lower layers were often less dense and forces that shattered rock would destroy organic remains, he resorted to a divine miracle having temporarily suspended gravity. William Whiston's New Theory of the Earth of 1696 combined scripture with Newtonian physics to propose that the original chaos was the atmosphere of a comet with the days of Creation each taking a year, and the Genesis Flood had resulted from a second comet. His explanation of how the Flood caused mountains and the fossil sequence was similar to Woodward's. Johann Jakob Scheuchzer wrote in support of Woodward's ideas in 1708, describing some fossil vertebrae as bones of sinners who had perished in the Flood. A skeleton found in a quarry was described by him in 1726 as Homo diluvii testis, a giant human testifying to the Flood. This was accepted for some time, but in 1812 it was shown to be a prehistoric salamander.

text: In 1695

text: John Woodward

text: An Essay Toward a Natural History of the Earth viewed the Genesis Flood as dissolving rocks and earth into a thick slurry which caught up all living things, and when the waters settled formed strata according to the

text: specific gravity

text: of these materials, including fossils of the organisms. When it was pointed out that lower layers were often less dense and forces that shattered rock would destroy organic remains, he resorted to a divine miracle having temporarily suspended gravity.

text: William Whiston

text: 's New Theory of the Earth of 1696 combined scripture with

text: Newtonian physics

text: to propose that the original chaos was the atmosphere of a

text: comet

text: with the days of Creation each taking a year, and the Genesis Flood had resulted from a second comet. His explanation of how the Flood caused mountains and the fossil sequence was similar to Woodward's.

text: Johann Jakob Scheuchzer

text: wrote in support of Woodward's ideas in 1708, describing some fossil vertebrae as bones of sinners who had perished in the Flood. A skeleton found in a quarry was described by him in 1726 as

text: Homo diluvii testis

text: , a giant human testifying to the Flood. This was accepted for some time, but in 1812 it was shown to be a prehistoric salamander.

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answers: Gravity

text: Weapon: Duel Beamswords, Handbeam, Barrier, Gravity Barrier Ram, Gravity Well, Implode Gravity Vortex.

text: Weapon: Duel Beamswords, Handbeam, Barrier, Gravity Barrier Ram, Gravity Well, Implode Gravity Vortex.

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text: In theoretical physics, Euclidean quantum gravity is a version of quantum gravity. It seeks to use the Wick rotation to describe the force of gravity according to the principles of quantum mechanics.

text: In

text: theoretical physics

text: , Euclidean quantum gravity is a version of

text: quantum gravity

text: . It seeks to use the

text: Wick rotation

text: to describe the force of

text: gravity

text: according to the principles of

text: quantum mechanics

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answers: Gravity

text: "Not What He Seems" is the eleventh episode of the second season of the American animated television series Gravity Falls, created by Alex Hirsch. The episode was written by Shion Takeuchi, Josh Weinstein, Jeff Rowe, Matt Chapman, and Hirsch, and directed by Stephen Sandoval. The series follows twelve-year-old twins Dipper (voiced by Jason Ritter) and Mabel Pines (voiced by Kristen Schaal), who stay for the summer with their grand uncle Grunkle Stan (voiced by Hirsch) in a tourist trap called the Mystery Shack, set within the fictional town of Gravity Falls, Oregon. In this episode, Dipper and Mabel begin to question who Stan really is after officers arrest him for stealing chemical waste. The episode, which breaks the show's status quo by revealing Stan's brother, ends with a cliffhanger to the second half of the season.

text: "Not What He Seems" is the eleventh episode of the

text: second season

text: of the American

text: animated television series

text: Gravity Falls

text: , created by Alex Hirsch. The episode was written by Shion Takeuchi,

text: Josh Weinstein

text: , Jeff Rowe,

text: Matt Chapman

text: , and Hirsch, and directed by Stephen Sandoval. The series follows twelve-year-old twins

text: Dipper

text: (voiced by

text: Jason Ritter

text: ) and

text: Mabel Pines

text: (voiced by

text: Kristen Schaal

text: ), who stay for the summer with their grand uncle

text: Grunkle Stan

text: (voiced by Hirsch) in a

text: tourist trap

text: called the Mystery Shack, set within the fictional town of Gravity Falls,

text: Oregon

text: . In this episode, Dipper and Mabel begin to question who Stan really is after officers arrest him for stealing chemical waste. The episode, which breaks the show's status quo by revealing Stan's brother, ends with a cliffhanger to the second half of the season.

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text: Since the theory of quantum gravity is not yet known, it is difficult to say what is the regime of validity of semiclassical gravity. However, one can formally show that semiclassical gravity could be deduced from quantum gravity by considering N copies of the quantum matter fields, and taking the limit of N going to infinity while keeping the product GN constant. At diagrammatic level, semiclassical gravity corresponds to summing all Feynman diagrams which do not have loops of gravitons (but have an arbitrary number of matter loops). Semiclassical gravity can also be deduced from an axiomatic approach.

text: Since the theory of quantum gravity is not yet known, it is difficult to say what is the regime of validity of semiclassical gravity. However, one can formally show that semiclassical gravity could be deduced from quantum gravity by considering N copies of the quantum matter fields, and taking the limit of N going to infinity while keeping the product GN constant. At diagrammatic level, semiclassical gravity corresponds to summing all

text: Feynman diagram

text: s which do not have loops of gravitons (but have an arbitrary number of matter loops). Semiclassical gravity can also be deduced from an axiomatic approach.

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answers: semiclassical gravity

text: Once a good profile is obtained of the physical property that is directly measured, it must be converted to a model of the property that is being investigated. For example, gravity measurements are used to obtain a model of the density profile under the surface. This is called an inverse problem. Given a model of the density, the gravity measurements at the surface can be predicted; but in an inverse problem the gravity measurements are known and the density must be inferred. This problem has uncertainties due to the noise and limited coverage of the surface, but even with perfect coverage many possible models of the interior could fit the data. Thus, additional assumptions must be made to constrain the model.

text: Once a good profile is obtained of the physical property that is directly measured, it must be converted to a model of the property that is being investigated. For example, gravity measurements are used to obtain a model of the density profile under the surface. This is called an

text: inverse problem

text: . Given a model of the density, the gravity measurements at the surface can be predicted; but in an inverse problem the gravity measurements are known and the density must be inferred. This problem has uncertainties due to the noise and limited coverage of the surface, but even with perfect coverage many possible models of the interior could fit the data. Thus, additional assumptions must be made to constrain the model.

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answers: Gravity

text: Vesely's notion of ground consists of a primary source of reference that in many ways coincides with the traditional Greek understanding of arché. Arché is not an absolute source of reference, but only a primary one that works as a point of departure towards our notion of "earth" and our understanding of "world" (pp. 50–52). This is an insecure ground that in a sense, speaks more of its own topography, than of clearly defined rules and references. Although this is an unfamiliar ground for modern science, Vesely accurately describes how much of the understanding of what it means to be situated derives from the knowledge of daily situations on Earth, where horizon and gravity play a common role. Accordingly, architecture's task of raising and 'building' situations does not address the mere existence of conditions such as floor or gravity, but concerns the fundamental condition of 'ground' allowing the phenomenon of situation to take place.

text: Vesely's notion of ground consists of a primary source of reference that in many ways coincides with the traditional Greek understanding of arché. Arché is not an absolute source of reference, but only a primary one that works as a point of departure towards our notion of "earth" and our understanding of "world" (pp. 50–52). This is an insecure ground that in a sense, speaks more of its own

text: topography

text: , than of clearly defined rules and references. Although this is an unfamiliar ground for modern science, Vesely accurately describes how much of the understanding of what it means to be situated derives from the knowledge of daily situations on Earth, where horizon and gravity play a common role. Accordingly, architecture's task of raising and 'building' situations does not address the mere existence of conditions such as floor or gravity, but concerns the fundamental condition of 'ground' allowing the phenomenon of situation to take place.

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answers: Earth

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity

text: The acceleration due to Earth’s gravity (see Standard gravity) at its surface is 976 to 983 Gal, the variation being due mainly to differences in latitude and elevation.  Mountains and masses of lesser density within the Earth's crust typically cause variations in gravitational acceleration of tens to hundreds of milligals (mGal). The gravity gradient (variation with height) above Earth's surface is about 3.1 µGal per centimeter of height (), resulting in a maximal difference of about 2 Gal (0.02 m/s) from the top of Mount Everest to sea level.

text: The acceleration due to Earth’s gravity (see

text: Standard gravity

text: ) at its surface is 976 to 983 Gal, the variation being due mainly to differences in

text: latitude

text: and

text: elevation

text: .  Mountains and masses of lesser density within the Earth's crust typically cause variations in

text: gravitational acceleration

text: of tens to hundreds of milligals (mGal). The gravity

text: gradient

text: (variation with height) above Earth's surface is about 3.1 µGal per centimeter of height (), resulting in a maximal difference of about 2 Gal (0.02 m/s) from the top of

text: Mount Everest

text: to sea level.

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: In Newton's description of gravity, the gravitational force is caused by matter. More precisely, it is caused by a specific property of material objects: their mass. In Einstein's theory and related theories of gravitation, curvature at every point in spacetime is also caused by whatever matter is present. Here, too, mass is a key property in determining the gravitational influence of matter. But in a relativistic theory of gravity, mass cannot be the only source of gravity. Relativity links mass with energy, and energy with momentum.

text: In

text: Newton's description of gravity

text: , the gravitational force is caused by matter. More precisely, it is caused by a specific property of material objects: their

text: mass

text: . In Einstein's theory and related

text: theories of gravitation

text: , curvature at every point in spacetime is also caused by whatever matter is present. Here, too, mass is a key property in determining the gravitational influence of matter. But in a relativistic theory of gravity, mass cannot be the only source of gravity. Relativity links mass with energy, and energy with momentum.

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text: During Babson's lifetime, the Foundation conducted Gravity Day Conferences each summer; established a library on gravity; solicited essays that addressed (1.) various prospects for shielding gravity, (2.) the development and/or discovery of materials that could convert gravitational force into heat, or (3.) methods of manipulating gravity; and installed monuments at various universities that cited its antigravity focus.

text: During Babson's lifetime, the Foundation conducted Gravity Day Conferences each summer; established a

text: library

text: on gravity; solicited essays that addressed (1.) various prospects for shielding gravity, (2.) the development and/or discovery of materials that could convert gravitational force into heat, or (3.) methods of manipulating gravity; and installed monuments at various universities that cited its antigravity focus.

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text: Armed with a scoop and spinning chain, Tornado pushed Gravity into the guardrail, and then into Sir Killalot. Tornado then continued pushing Gravity around the arena until Gravity got behind Tornado and flipped them. Gravity chased Tornado, but now both Gravity's tires were flat. Tornado pushed Gravity onto the flame pit. Gravity flipped Tornado again. Tornado recovered and pressed the Pit Button and shoved Gravity into the opening pit. Tornado was into the finals once again.

text: Armed with a scoop and spinning chain, Tornado pushed Gravity into the guardrail, and then into Sir Killalot. Tornado then continued pushing

text: Gravity

text: around the arena until Gravity got behind Tornado and flipped them. Gravity chased Tornado, but now both Gravity's tires were flat. Tornado pushed Gravity onto the flame pit. Gravity flipped Tornado again. Tornado recovered and pressed the Pit Button and shoved Gravity into the opening pit. Tornado was into the finals once again.

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answers: Gravity acts only between objects that are touching

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text: In an accelerating rocket after launch, or even in a rocket standing at the gantry, the proper acceleration is the acceleration felt by the occupants, and which is described as g-force (which is not a force but rather an acceleration; see that article for more discussion of proper acceleration) delivered by the vehicle only. The "acceleration of gravity" ("force of gravity") never contributes to proper acceleration in any circumstances, and thus the proper acceleration felt by observers standing on the ground is due to the mechanical force from the ground, not due to the "force" or "acceleration" of gravity. If the ground is removed and the observer allowed to free-fall, the observer will experience coordinate acceleration, but no proper acceleration, and thus no g-force. Generally, objects in such a fall or generally any such ballistic path (also called inertial motion), including objects in orbit, experience no proper acceleration (neglecting small tidal accelerations for inertial paths in gravitational fields). This state is also known as "zero gravity," ("zero-g") or "free-fall," and it always produces a sensation of weightlessness.

text: In an accelerating rocket after launch, or even in a rocket standing at the gantry, the proper acceleration is the acceleration felt by the occupants, and which is described as

text: g-force

text: (which is not a force but rather an acceleration; see that article for more discussion of proper acceleration) delivered by the vehicle only. The "acceleration of gravity" ("force of gravity") never contributes to proper acceleration in any circumstances, and thus the proper acceleration felt by observers standing on the ground is due to the mechanical force from the ground, not due to the "force" or "acceleration" of gravity. If the ground is removed and the observer allowed to free-fall, the observer will experience coordinate acceleration, but no proper acceleration, and thus no g-force. Generally, objects in such a fall or generally any such ballistic path (also called inertial motion), including objects in orbit, experience no proper acceleration (neglecting small tidal accelerations for inertial paths in gravitational fields). This state is also known as "zero gravity," ("zero-g") or "free-fall," and it always produces a sensation of

text: weightlessness

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answers: If the ground is removed and the observer allowed to free-fall

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answers: It always produces a sensation of weightlessness

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answers: This state also known as "zero gravity," ("zero-g") or "free-fall,"

text: Naeye further speculated that the gravity could be as high as ten g (ten times gravity on Earth's surface) on the surface of the core.

text: Naeye further speculated that the

text: gravity

text: could be as high as ten

text: g

text: (ten times gravity on Earth's surface) on the surface of the core.

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answers: It acts only between objects that are touching

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answers: g

text: The most common definition of weight found in introductory physics textbooks defines weight as the force exerted on a body by gravity. This is often expressed in the formula  , where W is the weight, m the mass of the object, and g gravitational acceleration.

text: The most common definition of weight found in introductory physics textbooks defines weight as the force exerted on a body by gravity. This is often expressed in the formula  , where W is the weight, m the mass of the object, and g

text: gravitational acceleration

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answers: It does not

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answers: W is the weight

text: A more advanced version of the sounding weight is the gravity corer. The gravity corer allows researchers to sample and study sediment layers at the bottom of oceans. The corer consists of an open-ended tube with a lead weight and a trigger mechanism that releases the corer from its suspension cable when the corer is lowered over the seabed and a small weight touches the ground. The corer falls into the seabed and penetrates it to a depth of up to 10 m (33 ft). By lifting the corer, a long, cylindrical sample is extracted in which the structure of the seabed’s layers of sediment is preserved. Recovering sediment cores allows scientists to see the presence or absence of specific fossils in the mud that may indicate climate patterns at times in the past, such as during the ice ages. Samples of deeper layers can be obtained with a corer mounted in a drill. The drilling vessel JOIDES Resolution is equipped to extract cores from depths of as much as 1,500 m (4900 ft) below the ocean bottom. (See Ocean Drilling Program)

text: A more advanced version of the sounding weight is the gravity corer. The gravity corer allows researchers to sample and study sediment layers at the bottom of oceans. The corer consists of an open-ended tube with a lead weight and a trigger mechanism that releases the corer from its suspension cable when the corer is lowered over the seabed and a small weight touches the ground. The corer falls into the seabed and penetrates it to a depth of up to 10 m (33 ft). By lifting the corer, a long, cylindrical sample is extracted in which the structure of the seabed’s layers of sediment is preserved. Recovering sediment cores allows scientists to see the presence or absence of specific fossils in the mud that may indicate climate patterns at times in the past, such as during the ice ages. Samples of deeper layers can be obtained with a corer mounted in a drill. The drilling vessel

text: JOIDES Resolution

text: is equipped to extract cores from depths of as much as 1,500 m (4900 ft) below the ocean bottom. (See

text: Ocean Drilling Program

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answers: a small weight touches the ground

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text: The absolute value of gravitational potential at a number of locations with regards to the gravitation from  the Earth, the Sun, and the Milky Way is given in the following table; i.e. an object at Earth's surface would need 60 MJ/kg to "leave" Earth's gravity field, another 900 MJ/kg to also leave the Sun's gravity field and more than 130 GJ/kg to leave the gravity field of the Milky Way. The potential is half the square of the escape velocity.

text: The absolute value of gravitational potential at a number of locations with regards to the gravitation from  the

text: Earth

text: , the

text: Sun

text: , and the

text: Milky Way

text: is given in the following table; i.e. an object at Earth's surface would need 60 MJ/kg to "leave" Earth's gravity field, another 900 MJ/kg to also leave the Sun's gravity field and more than 130 GJ/kg to leave the gravity field of the Milky Way. The potential is half the square of the

text: escape velocity

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text: A motorcycle with anti-gravity device ridden by the Eleventh Doctor, with companion Clara Oswald riding pillion, in the episode entitled The Bells of Saint John. The Doctor goes into the TARDIS after mentioning "the garage" and rides out of the TARDIS on the motorcycle. The motorcycle was a Triumph Scrambler in Jet Black colour scheme, with an anti-gravity control mounted on the fuel tank. The Doctor refers to having previously ridden it in the Anti-Gravity Olympics. The Doctor uses the anti-gravity capability in the episode to ride up the side of The Shard, to gain entry to a floor high up in the building.

text: A motorcycle with anti-gravity device ridden by the Eleventh Doctor, with companion

text: Clara Oswald

text: riding pillion, in the episode entitled

text: The Bells of Saint John

text: . The Doctor goes into the

text: TARDIS

text: after mentioning "the garage" and rides out of the TARDIS on the motorcycle. The motorcycle was a

text: Triumph Scrambler

text: in Jet Black colour scheme, with an anti-gravity control mounted on the fuel tank. The Doctor refers to having previously ridden it in the Anti-Gravity Olympics. The Doctor uses the anti-gravity capability in the episode to ride up the side of

text: The Shard

text: , to gain entry to a floor high up in the building.

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answers: It acts only between objects that are touching

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answers: Gravity

text: Only a few physical systems are actually linear with respect to the model parameters.  One such system from geophysics is that of the Earth's gravitational field.  The Earth's gravitational field is determined by the density distribution of the Earth in the subsurface.  Because the lithology of the Earth changes quite significantly, we are able to observe minute differences in the Earth's gravitational field on the surface of the Earth.  From our understanding of gravity (Newton's Law of Gravitation), we know that the mathematical expression for gravity is:

text: Only a few physical systems are actually linear with respect to the model parameters.  One such system from geophysics is that of the Earth's gravitational field.  The Earth's gravitational field is determined by the density distribution of the Earth in the subsurface.  Because the lithology of the Earth changes quite significantly, we are able to observe minute differences in the Earth's gravitational field on the surface of the Earth.  From our understanding of gravity (Newton's Law of Gravitation), we know that the mathematical expression for gravity is:

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text: In the video game Dead Space, artificial gravity plates are used to simulate an Earth-like environment in outer space. In several levels, gravity plating is off and the player has to navigate in weightlessness using 'Zero-Gravity Boots', similar to magnetic boots. Defective gravity plates are also encountered sometimes, which push objects upward rather than downward with great force, killing the player or enemies instantly if they step on them.

text: In the video game

text: Dead Space

text: , artificial gravity plates are used to simulate an Earth-like environment in outer space. In several levels, gravity plating is off and the player has to navigate in weightlessness using 'Zero-Gravity Boots', similar to

text: magnetic boots

text: . Defective gravity plates are also encountered sometimes, which push objects upward rather than downward with great force, killing the player or enemies instantly if they step on them.

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answers: Defective gravity plates

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answers: Zero

text: In 2000, experiments by NASA confirmed that gravity plays an indirect role in flame formation and composition. The common distribution of a flame under normal gravity conditions depends on convection, as soot tends to rise to the top of a flame (such as in a candle in normal gravity conditions), making it yellow. In microgravity or zero gravity environment, such as in orbit, natural convection no longer occurs and the flame becomes spherical, with a tendency to become bluer and more efficient. There are several possible explanations for this difference, of which the most likely is the hypothesis that the temperature is sufficiently evenly distributed that soot is not formed and complete combustion occurs. Experiments by NASA reveal that diffusion flames in microgravity allow more soot to be completely oxidized after they are produced than do diffusion flames on Earth, because of a series of mechanisms that behave differently in microgravity when compared to normal gravity conditions.  These discoveries have potential applications in applied science and industry, especially concerning fuel efficiency.

text: In 2000, experiments by NASA confirmed that

text: gravity

text: plays an indirect role in flame formation and composition. The common distribution of a flame under normal gravity conditions depends on convection, as soot tends to rise to the top of a flame (such as in a candle in normal gravity conditions), making it yellow. In

text: microgravity

text: or

text: zero gravity

text: environment, such as in

text: orbit

text: natural convection

text: no longer occurs and the flame becomes spherical, with a tendency to become bluer and more efficient. There are several possible explanations for this difference, of which the most likely is the hypothesis that the temperature is sufficiently evenly distributed that

text: soot

text: is not formed and complete combustion occurs. Experiments by

text: NASA

text: reveal that

text: diffusion flame

text: s in microgravity allow more soot to be completely oxidized after they are produced than do diffusion flames on

text: Earth

text: , because of a series of mechanisms that behave differently in microgravity when compared to normal gravity conditions.  These discoveries have potential applications in

text: applied science

text: and

text: industry

text: , especially concerning

text: fuel efficiency

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text: A ton-force is one of various units of force defined as the weight of one ton due to standard gravity.<ref group=note>All calculations on this page assume the following definition of standard gravity, g.

text: A ton-force is one of various

text: units

text: of

text: force

text: defined as the

text: weight

text: of one

text: ton

text: due to

text: standard gravity

text: .<ref group=note>All calculations on this page assume the following definition of standard gravity, g.

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answers: It acts only between objects that are touching

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text: This formula gives the true specific gravity i.e. based on densities. Brewers cannot (unless using a U-tube meter) measure density directly and so must use a hydrometer, whose stem is bathed in air, or pycnometer weighings which are also done in air. Hydrometer readings and the ratio of pycnometer weights are influenced by air (see article Specific Gravity for details) and are called "apparent" readings. True readings are easily obtained from apparent readings by

text: This formula gives the true specific gravity i.e. based on densities. Brewers cannot (unless using a

text: U-tube meter

text: ) measure density directly and so must use a hydrometer, whose stem is bathed in air, or pycnometer weighings which are also done in air. Hydrometer readings and the ratio of pycnometer weights are influenced by air (see article

text: Specific Gravity

text: for details) and are called "apparent" readings. True readings are easily obtained from apparent readings by

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text: The first person to discover that gravity varied over the Earth's surface was French scientist Jean Richer, who in 1671 was sent on an expedition to Cayenne, French Guiana, by the French Académie des Sciences, assigned the task of making measurements with a pendulum clock. Through the observations he made in the following year, Richer determined that the clock was 2½ minutes per day slower than at Paris, or equivalently the length of a pendulum with a swing of one second there was 1¼ Paris lines, or 2.6 mm, shorter than at Paris. It was realized by the scientists of the day, and proven by Isaac Newton in 1687, that this was due to the fact that the Earth was not a perfect sphere but slightly oblate; it was thicker at the equator because of the Earth's rotation. Since the surface was farther from the Earth's center at Cayenne than at Paris, gravity was weaker there. Since that time pendulums began to be used as precision gravimeters, taken on voyages to different parts of the world to measure the local gravitational acceleration. The accumulation of geographical gravity data resulted in more and more accurate models of the overall shape of the Earth.

text: The first person to discover that gravity varied over the Earth's surface was French scientist

text: Jean Richer

text: , who in 1671 was sent on an expedition to

text: Cayenne

text: French Guiana

text: , by the French

text: Académie des Sciences

text: , assigned the task of making measurements with a

text: pendulum clock

text: . Through the observations he made in the following year, Richer determined that the clock was 2½ minutes per day slower than at Paris, or equivalently the length of a pendulum with a swing of one second there was 1¼ Paris lines, or 2.6 mm, shorter than at Paris. It was realized by the scientists of the day, and proven by

text: Isaac Newton

text: in 1687, that this was due to the fact that the Earth was not a perfect sphere but slightly

text: oblate

text: ; it was thicker at the equator because of the Earth's rotation. Since the surface was farther from the Earth's center at Cayenne than at Paris, gravity was weaker there. Since that time pendulums began to be used as precision

text: gravimeter

text: s, taken on voyages to different parts of the world to measure the local gravitational acceleration. The accumulation of geographical gravity data resulted in more and more accurate models of the overall shape of the Earth.

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text: In orbital mechanics and aerospace engineering, a gravitational slingshot, gravity assist maneuver, or swing-by is the use of the relative movement (e.g. orbit around the Sun) and gravity of a planet or other astronomical object to alter the path and speed of a spacecraft, typically in order to save propellant, time, and expense. Gravity assistance can be used to accelerate a spacecraft, that is, to increase or decrease its speed and/or redirect its path. The "assist" is provided by the motion of the gravitating body as it pulls on the spacecraft. It was used by interplanetary probes from Mariner 10 onwards, including the two Voyager probes' notable flybys of Jupiter and Saturn.

text: In

text: orbital mechanics

text: and

text: aerospace engineering

text: , a gravitational slingshot, gravity assist maneuver, or swing-by is the use of the relative movement (e.g. orbit around the Sun) and

text: gravity

text: of a

text: planet

text: or other

text: astronomical object

text: to alter the

text: path

text: and

text: speed

text: of a

text: spacecraft

text: , typically in order to save

text: propellant

text: time

text: , and expense. Gravity assistance can be used to

text: accelerate

text: a spacecraft, that is, to increase or decrease its speed and/or redirect its path. The "assist" is provided by the motion of the gravitating body as it pulls on the spacecraft. It was used by interplanetary probes from

text: Mariner 10

text: onwards, including the two

text: Voyager

text: probes' notable

text: flyby

text: s of Jupiter and Saturn.

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text: In perturbative quantum gravity (from which the non-renormalization arguments originate), as with any perturbative scheme, one makes the assumption that the unperturbed starting point is qualitatively the same as the true quantum state – so perturbative quantum gravity makes the physically unwarranted assumption that the true structure of quantum space-time can be approximated by a smooth classical (usually Minkowski) spacetime. Canonical quantum gravity on the other hand makes no such assumption and instead allows the theory itself tell you, in principle, what the true structure of quantum space-time is. A long held expectation is that in a theory of quantum geometry such as canonical quantum gravity that geometric quantities such as area and volume become quantum observables and take non-zero discrete values, providing a natural regulator which eliminates infinities from the theory including those coming from matter contributions. This `quantization' of geometric observables is in fact realized in loop quantum gravity (LQG).

text: In

text: perturbative quantum gravity

text: (from which the non-renormalization arguments originate), as with any perturbative scheme, one makes the assumption that the unperturbed starting point is qualitatively the same as the true quantum state – so perturbative quantum gravity makes the physically unwarranted assumption that the true structure of quantum space-time can be approximated by a smooth classical (usually Minkowski) spacetime. Canonical quantum gravity on the other hand makes no such assumption and instead allows the theory itself tell you, in principle, what the true structure of quantum space-time is. A long held expectation is that in a theory of quantum geometry such as canonical quantum gravity that geometric quantities such as area and volume become

text: quantum observables

text: and take non-zero discrete values, providing a natural regulator which eliminates infinities from the theory including those coming from matter contributions. This `quantization' of geometric observables is in fact realized in loop quantum gravity (LQG).

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text: Arch-gravity dams are massive dams of concrete that resist the thrust of water by their weight using the force of gravity and the arch action.

text: Arch-gravity dams are massive dams of

text: concrete

text: that resist the thrust of water by their weight using the force of

text: gravity

text: and the arch action.

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text: Kohei Tanaka, who worked on the music for Gravity Rush, returned to compose the music for Gravity Rush 2. An anime, titled Gravity Rush: The Animation ~ Overture ~, is set to be release before the game's official launch. Written by Studio Khara, it serves as a bridge to fill the narrative gap between Gravity Rush and Gravity Rush 2.

text: Kohei Tanaka

text: , who worked on the music for Gravity Rush, returned to compose the music for Gravity Rush 2. An anime, titled Gravity Rush: The Animation ~ Overture ~, is set to be release before the game's official launch. Written by

text: Studio Khara

text: , it serves as a bridge to fill the narrative gap between Gravity Rush and Gravity Rush 2.

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answers: Gravity acts only between objects that are touching.

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answers: distance

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answers: Gravity

answers: NDQ_017286

answers: Gravity Rush

answers: NDQ_017290

answers: Gravity Rush

text: Since weight under gravity is a force, several of these examples refer to the weight of various objects.  Unless otherwise stated, these are weights under average Earth gravity at sea level.

text: Since

text: weight

text: under gravity is a force, several of these examples refer to the weight of various objects.  Unless otherwise stated, these are weights under average Earth gravity at sea level.

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answers: Gravity acts only between objects that are touching

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answers: Earth

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answers: Earth gravity

answers: NDQ_017290

answers: Unless otherwise stated

text: The shape of the Earth is to a large extent the result of its rotation, which causes its equatorial bulge, and the competition of geological processes such as the collision of plates and of volcanism, resisted by the Earth's gravity field. This applies to the solid surface, the liquid surface (dynamic sea surface topography) and the Earth's atmosphere. For this reason, the study of the Earth's gravity field is called physical geodesy by some.

text: The shape of the Earth is to a large extent the result of its rotation, which causes its equatorial bulge, and the competition of geological processes such as the collision of plates and of

text: volcanism

text: , resisted by the Earth's

text: gravity

text: field. This applies to the solid surface, the liquid surface (

text: dynamic sea surface topography

text: ) and the

text: Earth's atmosphere

text: . For this reason, the study of the Earth's

text: gravity field

text: is called

text: physical geodesy

text: by some.

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answers: Collisions

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answers: This applies to the solid surface

answers: NDQ_017290

answers: Gravity

text: A gravity gradiometer can independently determine the components of the gravity vector on a real-time basis. A gravity gradient is simply the spatial derivative of the gravity vector. The gradient can be thought of as the rate of change of a component of the gravity vector as measured over a small distance. Hence, the gradient can be measured by determining the difference in gravity at two close but distinct points. This principle is embodied in several recent moving-base instruments. The gravity gradient at a point is a tensor, since it is the derivative of each component of the gravity vector taken in each sensitive axis. Thus, the value of any component of the gravity vector can be known all along the path of the vehicle if gravity gradiometers are included in the system and their outputs are integrated by the system computer. An accurate gravity model will be computed in real-time and a continuous map of normal gravity, elevation, and anomalous gravity will be available.

text: A gravity gradiometer can independently determine the components of the gravity vector on a real-time basis. A gravity gradient is simply the spatial derivative of the gravity vector. The gradient can be thought of as the rate of change of a component of the gravity

text: vector

text: as measured over a small distance. Hence, the gradient can be measured by determining the difference in gravity at two close but distinct points. This principle is embodied in several recent moving-base instruments. The gravity gradient at a point is a

text: tensor

text: , since it is the derivative of each component of the gravity vector taken in each sensitive axis. Thus, the value of any component of the gravity vector can be known all along the path of the vehicle if gravity gradiometers are included in the system and their outputs are integrated by the system computer. An accurate gravity model will be computed in real-time and a continuous map of normal gravity, elevation, and anomalous gravity will be available.

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answers: It acts only between objects that are touching.

answers: NDQ_017283

answers: distance

answers: NDQ_017284

answers: anomalous gravity

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: A gravity gradiometer

text: The characteristics of an airplane with respect to spinning are significantly influenced by the position of the center of gravity. In general terms, the further forward the center of gravity the less readily the airplane will spin, and the more readily it will recover from a spin. Conversely, the further aft the center of gravity the more readily the airplane will spin, and the less readily it will recover from a spin. In any airplane, the forward and aft limits on center of gravity are carefully defined. In some airplanes that are approved for intentional spinning, the aft limit at which spins may be attempted is not as far aft as the aft limit for general flying. Intentional spinning should not be attempted casually, and the most important pre-flight precaution is to determine that the airplane's center of gravity will be within the range approved for intentional spinning. For this reason, pilots should first determine what "tendency" the airplane will do before it stalls. If the tendency is to pitch down (nose-heavy) when it stalls, then the aircraft is likely to recover on its own. However, if the tendency is to pitch up (tail-heavy) when it stalls, the aircraft will likely transition into a "flat-spin" where stall recovery would be delayed, or not be recoverable at all.

text: The characteristics of an airplane with respect to spinning are significantly influenced by the position of the

text: center of gravity

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text: While on a structure or asteroid within range of a gravity generator, if the player's jetpack is disabled, movement is restricted to a plane perpendicular to the direction of the net gravity field(s). Vertical viewing angle is also restricted between −90 and 90 degrees, as in most first person shooters. If the player falls off a structure while within a gravity field, the player will fall into space until out of range of the gravity generator, at which point the player's jetpack will automatically enable itself. However, ships and structures are unaffected by gravity generators unless equipped with the Artificial Mass block. Players and the Artificial Mass block can accelerate past the maximum thruster speed of 154.7 meters/second using multiple gravity generators.

text: While on a structure or asteroid within range of a gravity generator, if the player's jetpack is disabled, movement is restricted to a plane perpendicular to the direction of the net gravity field(s). Vertical viewing angle is also restricted between −90 and 90 degrees, as in most

text: first person shooter

text: s. If the player falls off a structure while within a gravity field, the player will fall into space until out of range of the gravity generator, at which point the player's jetpack will automatically enable itself. However, ships and structures are unaffected by gravity generators unless equipped with the Artificial Mass block. Players and the Artificial Mass block can accelerate past the maximum thruster speed of 154.7 meters/second using multiple gravity generators.

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text: Gravity on Mars is only about 38% as strong as it is on Earth, and the long-term effects of such reduced gravity are unknown. Astronauts who are weightless for long periods of time lose significant amounts of bone and muscle mass. It is unclear if the gravity on Mars is strong enough to avoid or minimize these health problems. The Mars Gravity Biosatellite was meant to provide data on how mammalian health is affected by long-term exposure to lower levels of gravity, focusing on bone loss, changes in bone structure, muscle atrophy, and changes in the inner ear. The results from the experiment would be compared against a variety of earth based controls, including vivarium, hindlimb suspension, partial weight suspension, flight habitat effects, and short-radius centrifuge testing.

text: Gravity on Mars is only about 38% as strong as it is on Earth, and the long-term effects of such reduced gravity are unknown. Astronauts who are weightless for long periods of time lose significant amounts of bone and muscle mass. It is unclear if the gravity on Mars is strong enough to avoid or minimize these health problems. The Mars Gravity Biosatellite was meant to provide data on how mammalian health is affected by long-term exposure to lower levels of gravity, focusing on bone loss, changes in bone structure,

text: muscle atrophy

text: , and changes in the

text: inner ear

text: . The results from the experiment would be compared against a variety of earth based controls, including vivarium, hindlimb suspension, partial weight suspension, flight habitat effects, and short-radius centrifuge testing.

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answers: Gravity acts only between objects that are touching

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answers: weightless

text: Leonardo comments on how gravity, which is caused by the "attraction of one object to another", takes place when an object is placed above another object and the top object is heavier than the bottom object. He also writes on the workings of a balance by describing how "the vertical center of a balance must always be perpendicular" and how the length of the arm on the balance is proportional to the amount of oscillations and the oscillation angle. A short commentary is included on relating density to weight, and he questions why ice floats in water if it is the denser of the two.

text: Leonardo comments on how gravity, which is caused by the "attraction of one object to another", takes place when an object is placed above another object and the top object is heavier than the bottom object. He also writes on the workings of a balance by describing how "the vertical center of a balance must always be perpendicular" and how the length of the arm on the balance is proportional to the amount of oscillations and the oscillation angle. A short commentary is included on relating density to weight, and he questions why ice floats in water if it is the denser of the two.

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answers: NDQ_017286

answers: yes

answers: NDQ_017290

answers: the vertical center of a balance must always be perpendicular

text: A spring balance measures the weight of an object by opposing the force of gravity acting with the force of an extended spring.

text: A spring balance measures the weight of an object by opposing the force of gravity acting with the force of an extended spring.

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answers: It does not

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answers: weight

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answers: extended spring

answers: NDQ_017286

answers: Yes

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answers: spring balance

text: In a vehicle which relies on gravity in some way, weight distribution directly affects a variety of vehicle characteristics, including handling, acceleration, traction, and component life.  For this reason weight distribution varies with the vehicle's intended usage. For example, a drag car maximizes traction at the rear axle while countering the reactionary pitch-up torque.  It generates this counter-torque by placing a small amount of counterweight at a great distance forward of the rear axle.

text: In a vehicle which relies on gravity in some way, weight distribution directly affects a variety of vehicle characteristics, including

text: handling

text: acceleration

text: traction

text: , and component life.  For this reason weight distribution varies with the vehicle's intended usage. For example, a

text: drag car

text: maximizes traction at the rear axle while countering the reactionary pitch-up torque.  It generates this counter-torque by placing a small amount of counterweight at a great distance forward of the rear axle.

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answers: Gravity acts only between objects that are touching

answers: NDQ_017283

answers: weight

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answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: weight distribution

text: The weapons in Space Tanks are at affected by of each of the planet's gravity and it takes a reasonable amount of trial and error before the player's shots start hitting on target. There are over 30 weapons and 70 tanks in the final game, with each projectile having a different velocity or weight, thus being affected by the gravity in a different manner.

text: The weapons in Space Tanks are at affected by of each of the planet's

text: gravity

text: and it takes a reasonable amount of

text: trial and error

text: before the player's shots start hitting on target. There are over 30 weapons and 70 tanks in the final game, with each projectile having a different velocity or weight, thus being affected by the gravity in a different manner.

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answers: Gravity

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answers: weight

text: Ditching weights at the surface will move the centre of gravity slightly further back if the weights were carried forward of the centre of gravity, and in almost all cases will result in a stable condition where the diver is more horizontal in the water.

text: Ditching weights at the surface will move the centre of gravity slightly further back if the weights were carried forward of the centre of gravity, and in almost all cases will result in a stable condition where the diver is more horizontal in the water.

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text: The other major method used to simulate microgravity is flight in a reduced gravity aircraft (a so-called "vomit comet"), an aircraft which performs a number of parabolic climbs and descents to give its occupants the sensation of zero gravity. Reduced-gravity aircraft training avoids neutral-buoyancy training's drag problem (trainees are surrounded by air rather than water), but instead faces a severe time limitation: periods of sustained weightlessness are limited to around 25 seconds, interspersed with periods of acceleration of around 2 g as the aircraft pulls out of its dive and readies for the next run. This is unsuitable for practicing EVAs, which usually last several hours.

text: The other major method used to simulate

text: microgravity

text: is flight in a

text: reduced gravity aircraft

text: (a so-called "vomit comet"), an aircraft which performs a number of parabolic climbs and descents to give its occupants the sensation of zero gravity. Reduced-gravity aircraft training avoids neutral-buoyancy training's drag problem (trainees are surrounded by air rather than water), but instead faces a severe time limitation: periods of sustained weightlessness are limited to around 25 seconds, interspersed with periods of acceleration of around 2

text: g

text: as the aircraft pulls out of its dive and readies for the next run. This is unsuitable for practicing EVAs, which usually last several hours.

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answers: Zero gravity

text: Like other early modern choreographers, Graham used floorwork to explore the themes of weight and gravity in new ways; European students were "shocked" when Anna Sokolow introduced them to Graham's "percussive" falling techniques in the 1950s.

text: Like other early modern choreographers, Graham used

text: floorwork

text: to explore the themes of weight and gravity in new ways; European students were "shocked" when

text: Anna Sokolow

text: introduced them to Graham's "percussive" falling techniques in the 1950s.

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text: The acceleration due to gravity on the surface of the Moon is 1.62519 m/s, about 16.6% that on Earth's surface or 0.16 . Over the entire surface, the variation in gravitational acceleration is about 0.0253 m/s (1.6% of the acceleration due to gravity). Because weight is directly dependent upon gravitational acceleration, things on the Moon will weigh only 16.6% of what they weigh on the Earth.

text: The acceleration due to gravity on the surface of the Moon is 1.62519 m/s, about 16.6% that on Earth's surface or 0.16

text: . Over the entire surface, the variation in gravitational acceleration is about 0.0253 m/s (1.6% of the acceleration due to gravity). Because

text: weight

text: is directly dependent upon gravitational acceleration, things on the Moon will weigh only 16.6% of what they weigh on the Earth.

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answers: things on the Moon will weigh only 16.6% of what they weigh on the Earth

text: In 1984 Pierre Boucheron studied the accuracy of a Shortt clock preserved at the US Naval Observatory.  Using modern optical sensors which detected the precise time of passage of the pendulum without disturbing it, he compared its rate to an atomic clock for a month.  He found that it was stable to 200 microseconds per day (2.31 ppb), equivalent to an error rate of one second in 12 years, far more accurate than the 1 second per year that was previously measured.   His data revealed the clock was so sensitive it was detecting the slight changes in gravity due to tidal distortions in the solid Earth caused by the gravity of the Sun and Moon.

text: In 1984 Pierre Boucheron studied the accuracy of a Shortt clock preserved at the

text: US Naval Observatory

text: .  Using modern optical sensors which detected the precise time of passage of the pendulum without disturbing it, he compared its rate to an

text: atomic clock

text: for a month.  He found that it was stable to 200

text: microsecond

text: s per day (2.31

text: ppb

text: ), equivalent to an error rate of one second in 12 years, far more accurate than the 1 second per year that was previously measured.   His data revealed the clock was so sensitive it was detecting the slight changes in gravity due to tidal distortions in the solid Earth caused by the gravity of the Sun and Moon.

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answers: Gravity

text: The gravity-controlling mechanics introduced in Gravity Rush are expanded in Gravity Rush 2. Players are able to choose among three gravity styles: the original style from the first game, Lunar and Jupiter. Lunar will be light and increase Kat's speed and her ability to jump higher. Jupiter will make Kat feel heavy, giving her attacks more impact. Players can change between gravity styles using the touch pad.

text: The gravity-controlling mechanics introduced in Gravity Rush are expanded in Gravity Rush 2. Players are able to choose among three gravity styles: the original style from the first game, Lunar and Jupiter. Lunar will be light and increase Kat's speed and her ability to jump higher. Jupiter will make Kat feel heavy, giving her attacks more impact. Players can change between gravity styles using the touch pad.

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text: Gravity gradiometry is the study and measurement of variations in the acceleration due to gravity. The gravity gradient is the spatial rate of change of gravitational acceleration.

text: Gravity gradiometry is the study and measurement of variations in the

text: acceleration

text: due to

text: gravity

text: . The gravity gradient is the spatial rate of change of gravitational acceleration.

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text: Anti-gravity is an idea of creating a place or object that is free from the force of gravity. It does not refer to the lack of weight under gravity experienced in free fall or orbit, or to balancing the force of gravity with some other force, such as electromagnetism or aerodynamic lift. Anti-gravity is a recurring concept in science fiction, particularly in the context of spacecraft propulsion.  Examples are the gravity blocking substance "Cavorite" in H. G. Wells' The First Men in the Moon and the Spindizzy machines in James Blish's Cities in Flight.

text: Anti-gravity is an idea of creating a place or object that is free from the force of

text: gravity

text: . It does not refer to the lack of weight under gravity experienced in

text: free fall

text: or

text: orbit

text: , or to balancing the force of gravity with some other force, such as electromagnetism or aerodynamic lift. Anti-gravity is a recurring concept in science fiction, particularly in the context of

text: spacecraft propulsion

text: .  Examples are the gravity blocking substance "Cavorite" in

text: H. G. Wells

text: The First Men in the Moon

text: and the

text: Spindizzy

text: machines in

text: James Blish's

text: Cities in Flight

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answers: Gravity acts only between objects that are touching

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text: 7. Gravity Destroyer AD145WD/ Gravity Perseus AD145WD

text: 7. Gravity Destroyer AD145WD/ Gravity Perseus AD145WD

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answers: 3: The answer has limited relevance and completeness, with noticeable gaps or inaccuracies.

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answers: Gravity acts only between objects that are touching

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answers: Gravity Destroyer

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answers: Gravity Destroyer

text: Some of the inhomogeneity in a gravitational field may be modeled by a variable but parallel field: , where  is some constant unit vector. Although a non-uniform gravitational field cannot be exactly parallel, this approximation can be valid if the body is sufficiently small. The center of gravity may then be defined as a certain weighted average of the locations of the particles composing the body. Whereas the center of mass averages over the mass of each particle, the center of gravity averages over the weight of each particle:

text: Some of the inhomogeneity in a gravitational field may be modeled by a variable but parallel field: , where  is some constant unit vector. Although a non-uniform gravitational field cannot be exactly parallel, this approximation can be valid if the body is sufficiently small. The center of gravity may then be defined as a certain weighted average of the locations of the particles composing the body. Whereas the center of mass averages over the mass of each particle, the center of gravity averages over the weight of each particle:

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answers: It acts only between objects that are touching

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answers: weight of each particle

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Weight is measured with a balance

text: The force known as "weight" is proportional to mass and acceleration in all situations where the mass is accelerated away from free fall. For example, when a body is at rest in a gravitational field (rather than in free fall), it must be accelerated by a force from a scale or the surface of a planetary body such as the Earth or the Moon. This force keeps the object from going into free fall. Weight is the opposing force in such circumstances, and is thus determined by the acceleration of free fall. On the surface of the Earth, for example, an object with a mass of 50 kilograms weighs 491 newtons, which means that 491 newtons is being applied to keep the object from going into free fall. By contrast, on the surface of the Moon, the same object still has a mass of 50 kilograms but weighs only 81.5 newtons, because only 81.5 newtons is required to keep this object from going into a free fall on the moon. Restated in mathematical terms, on the surface of the Earth, the weight W of an object is related to its mass m by , where  is the acceleration due to Earth's gravitational field, (expressed as the acceleration experienced by a free-falling object).

text: The force known as "weight" is proportional to mass and

text: acceleration

text: in all situations where the mass is accelerated away from free fall. For example, when a body is at rest in a gravitational field (rather than in free fall), it must be accelerated by a force from a scale or the surface of a planetary body such as the

text: Earth

text: or the

text: Moon

text: . This force keeps the object from going into free fall. Weight is the opposing force in such circumstances, and is thus determined by the acceleration of free fall. On the surface of the Earth, for example, an object with a mass of 50 kilograms weighs 491 newtons, which means that 491 newtons is being applied to keep the object from going into free fall. By contrast, on the surface of the Moon, the same object still has a mass of 50 kilograms but weighs only 81.5 newtons, because only 81.5 newtons is required to keep this object from going into a free fall on the moon. Restated in mathematical terms, on the surface of the Earth, the weight W of an object is related to its mass m by , where  is the acceleration due to

text: Earth's gravitational field

text: , (expressed as the acceleration experienced by a free-falling object).

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answers: This force keeps the object from going into free fall

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answers: Earth

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answers: Gravitational attraction

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answers: scale

text: In the Earth's atmosphere, gravity waves are a mechanism that produce the transfer of momentum from the troposphere to the stratosphere and mesosphere. Gravity waves are generated in the troposphere by frontal systems or by airflow over mountains. At first, waves propagate through the atmosphere without appreciable change in mean velocity.  But as the waves reach more rarefied (thin) air at higher altitudes, their amplitude increases, and nonlinear effects cause the waves to break, transferring their momentum to the mean flow. This transfer of momentum is responsible for the forcing of the many large-scale dynamical features of the atmosphere. For example, this momentum transfer is partly responsible for the driving of the Quasi-Biennial Oscillation, and in the mesosphere, it is thought to be the major driving force of the Semi-Annual Oscillation. Thus, this process plays a key role in the dynamics of the middle atmosphere.

text: In the

text: Earth's

text: atmosphere

text: , gravity waves are a mechanism that produce the transfer of

text: momentum

text: from the

text: troposphere

text: to the

text: stratosphere

text: and

text: mesosphere

text: . Gravity waves are generated in the troposphere by

text: frontal systems

text: or by airflow over

text: mountain

text: s. At first, waves propagate through the atmosphere without appreciable change in

text: mean

text: velocity

text: .  But as the waves reach more rarefied (thin) air at higher

text: altitude

text: s, their

text: amplitude

text: increases, and

text: nonlinear effects

text: cause the waves to break, transferring their momentum to the mean flow. This transfer of momentum is responsible for the forcing of the many large-scale dynamical features of the atmosphere. For example, this momentum transfer is partly responsible for the driving of the

text: Quasi-Biennial Oscillation

text: , and in the

text: mesosphere

text: , it is thought to be the major driving force of the Semi-Annual Oscillation. Thus, this process plays a key role in the

text: dynamics

text: of the middle

text: atmosphere

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answers: It does not

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: Past research using the gravity model has also sought to evaluate the impact of various variables in addition to the basic gravity equation. Among these, price level and exchange rate variables have been shown to have a relationship in the gravity model that accounts for a significant amount of the variance not explained by the basic gravity equation. According to empirical results on price level, the effect of price level varies according to the relationship being examined. For instance, if exports are being examined, a relatively high price level on the part of the importer would be expected to increase trade with that country. A non-linear system of equations are used by Anderson and van Wincoop (2003) to account for the endogenous change in these price terms from trade liberalization. A more simple method is to use a first order log-linearization of this system of equations (Baier and Bergstrand (2009)), or exporter-country-year and importer-country-year dummy variables. For counterfactual analysis, however, one would still need to account for the change in world prices.

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answers: Gravity does not act between objects

answers: NDQ_017283

answers: weight

answers: NDQ_017284

answers: price level

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity

text: The density of water varies with temperature and pressure as does the density of the sample. So it is necessary to specify the temperatures and pressures at which the densities or weights were determined. It is nearly always the case that measurements are made at 1 nominal atmosphere (1013.25 mbar ± variations from changing weather patterns). But as specific gravity usually refers to highly incompressible aqueous solutions or other incompressible substances (such as petroleum products), variations in density caused by pressure are usually neglected at least where apparent specific gravity is being measured. For true (in vacuo) specific gravity calculations, air pressure must be considered (see below). Temperatures are specified by the notation

text: The density of water varies with temperature and pressure as does the density of the sample. So it is necessary to specify the temperatures and pressures at which the densities or weights were determined. It is nearly always the case that measurements are made at 1 nominal atmosphere (1013.25 mbar ± variations from changing weather patterns). But as specific gravity usually refers to highly incompressible aqueous solutions or other incompressible substances (such as petroleum products), variations in density caused by pressure are usually neglected at least where apparent specific gravity is being measured. For true (in vacuo) specific gravity calculations, air pressure must be considered (see below). Temperatures are specified by the notation

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answers: temperature and pressure

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answers: pressure

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answers: NDQ_017286

answers: The density of water varies with temperature and pressure

answers: NDQ_017290

answers: densities or weights

text: When a body is affected by a non-uniform external gravitational field, one can sometimes define a center of gravity relative to that field that will act as a point where the gravitational force is applied. Textbooks such as the The Feynman Lectures on Physics characterize the center of gravity as a point about which there is no torque. In other words, the center of gravity is a point of application for the resultant force. Under this formulation, the center of gravity  is defined as a point that satisfies the equation

text: When a body is affected by a non-uniform external gravitational field, one can sometimes define a center of gravity relative to that field that will act as a point where the gravitational force is applied. Textbooks such as the

text: The Feynman Lectures on Physics

text: characterize the center of gravity as a point about which there is no torque. In other words, the center of gravity is a point of application for the resultant force. Under this formulation, the center of gravity  is defined as a point that satisfies the equation

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answers: It does not.

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text:
"(..) Sir Isaac Newton, renowned inventor of the milled-edge coin and the catflap!"
"The what?" said Richard.
"The catflap! A device of the utmost cunning, perspicuity and invention. It is a door within a door, you see, a ..."
"Yes," said Richard, "there was also the small matter of gravity."
"Gravity," said Dirk with a slightly dismissive shrug, "yes, there was that as well, I suppose. Though that, of course, was merely a discovery. It was there to be discovered." ...

text:
"(..) Sir Isaac Newton, renowned inventor of the milled-edge coin and the catflap!"
"The what?" said Richard.
"The catflap! A device of the utmost cunning, perspicuity and invention. It is a door within a door, you see, a ..."
"Yes," said Richard, "there was also the small matter of gravity."
"Gravity," said Dirk with a slightly dismissive shrug, "yes, there was that as well, I suppose. Though that, of course, was merely a discovery. It was there to be discovered." ...

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answers: Yes

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answers: Gravity

text: Gravity refers to the weight spectrum of hydrocarbons, which increases with the ratio of hydrogen to carbon in a chemical compound's molecule. Methane () - the simplest form of natural gas - has four hydrogen atoms for every carbon atom. It has light gravity, and takes the form of a gas at normal temperatures and pressures. The next heavier hydrocarbon, ethane, has the chemical formula CH and is a slightly denser gas. Gases, of course, have no gravity at atmospheric temperatures and pressures.

text: Gravity

text: refers to the weight spectrum of

text: hydrocarbon

text: s, which increases with the ratio of

text: hydrogen

text: to

text: carbon

text: in a

text: chemical compound

text: 's

text: molecule

text: Methane

text: () - the simplest form of

text: natural gas

text: - has four hydrogen atoms for every carbon atom. It has light gravity, and takes the form of a

text: gas

text: at normal temperatures and pressures. The next heavier hydrocarbon,

text: ethane

text: , has the

text: chemical formula

text: CH and is a slightly denser gas. Gases, of course, have no gravity at atmospheric temperatures and pressures.

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answers: Gravity refers to the weight spectrum

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answers: weight spectrum

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: Gravity Wells: Gravity Wells draw players toward them within a fixed radius. If a player touches a gravity well, the player pops.

text: Gravity Wells: Gravity Wells draw players toward them within a fixed radius. If a player touches a gravity well, the player pops.

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answers: Gravity Wells

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answers: Gravity

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answers: Gravity

text: Strictly speaking, the aim of quantum gravity is only to describe the quantum behavior of the gravitational field and should not be confused with the objective of unifying all fundamental interactions into a single mathematical framework. While any substantial improvement into the present understanding of gravity would aid further work towards unification, study of quantum gravity is a field in its own right with various branches having different approaches to unification. Although some quantum gravity theories, such as string theory, try to unify gravity with the other fundamental forces, others, such as loop quantum gravity, make no such attempt; instead, they make an effort to quantize the gravitational field while it is kept separate from the other forces. A theory of quantum gravity that is also a grand unification of all known interactions is sometimes referred to as The Theory of Everything (TOE).

text: Strictly speaking, the aim of quantum gravity is only to describe the quantum behavior of the gravitational field and should not be confused with the objective of

text: unifying all fundamental interactions

text: into a single mathematical framework. While any substantial improvement into the present understanding of gravity would aid further work towards unification, study of quantum gravity is a field in its own right with various branches having different approaches to unification. Although some quantum gravity theories, such as

text: string theory

text: , try to unify gravity with the other

text: fundamental force

text: s, others, such as

text: loop quantum gravity

text: , make no such attempt; instead, they make an effort to quantize the gravitational field while it is kept separate from the other forces. A theory of quantum gravity that is also a

text: grand unification

text: of all known interactions is sometimes referred to as

text: The Theory of Everything

text: (TOE).

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answers: unification

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answers: interactions

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answers: string

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: Regardless of the specific configuration, such a telescope would be similar to an earth-based liquid mirror telescope.  However, instead of relying on Earth's gravity to maintain the necessary parabolic shape of the rotating mercury mirror, it relies on artificial gravity instead.

text: Regardless of the specific configuration, such a telescope would be similar to an earth-based

text: liquid mirror telescope

text: .  However, instead of relying on Earth's gravity to maintain the necessary parabolic shape of the rotating mercury mirror, it relies on

text: artificial gravity

text: instead.

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answers: gravity

text: The engineering challenges of creating a rotating spacecraft are comparatively modest to any other proposed approach. Theoretical spacecraft designs using artificial gravity have a great number of variants with intrinsic problems and advantages. To reduce precession forces to livable levels, a rate of spin of 2 rpm or less would be needed. The formula for the centripetal force implies that the radius of rotation grows with the square of the orbital period, so a doubling of the orbital period requires a fourfold increase in the radius of rotation. For example, to produce standard gravity,  =  with an orbital period of 15 s, the radius of rotation would have to be , while an orbital period of 30 s would require it to be . To reduce mass, the support along the diameter could consist of nothing but a cable connecting two sections of the spaceship, possibly a habitat module and a counterweight consisting of every other part of the spacecraft. It is not yet known if exposure to high gravity for short periods of time is as beneficial to health as continuous exposure to normal gravity. It is also not known how effective low levels of gravity would be to countering the adverse effects on health of weightlessness. Artificial gravity at 0.1g and an orbital period of 30 s would require a radius of only . Likewise, at a radius of 10  m, an orbital period of just over 6 s would be required to produce standard gravity (at the hips; gravity would be 11% higher at the feet), while 4.5 s would produce 2g. If brief exposure to high gravity can negate the health effects of weightlessness, then a small centrifuge could be used as an exercise area.

text: The engineering challenges of creating a rotating spacecraft are comparatively modest to any other proposed approach. Theoretical spacecraft designs using artificial gravity have a great number of variants with intrinsic problems and advantages. To reduce precession forces to livable levels, a rate of spin of 2 rpm or less would be needed. The formula for the

text: centripetal force

text: implies that the radius of rotation grows with the square of the orbital period, so a doubling of the orbital period requires a fourfold increase in the radius of rotation. For example, to produce

text: standard gravity

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answers: gravity acts only between objects that are touching

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answers: Gravity

answers: NDQ_017290

answers: counterweight

text: Being the derivatives of gravity, the spectral power of gravity gradient signals is pushed to higher frequencies. This generally makes the gravity gradient anomaly more localised to the source than the gravity anomaly. The table (below) and graph (Fig 2) compare the g and G responses from a point source.

text: Being the derivatives of gravity, the spectral power of gravity gradient signals is pushed to higher frequencies. This generally makes the gravity gradient anomaly more localised to the source than the gravity anomaly. The table (below) and graph (Fig 2) compare the g and G responses from a point source.

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: Although crude oil assays evaluate various chemical properties of the oil, the two most important properties determining a crude's value are its density (measured as API specific gravity) and its sulphur content (measured per mass). Crude oil is considered "heavy" if it has long hydrocarbon chains, or "light" if it has short hydrocarbon chains: an API gravity of 34 or higher is "light", between 31-33 is "medium", and 30 or below is "heavy".Crude is considered "sweet" if it is low in sulphur content (< 0.5%/weight), or "sour" if high (> 1.0%/weight). Generally, the higher the API gravity (the "lighter" it is), the more valuable the crude.

text: Although crude oil assays evaluate various chemical properties of the oil, the two most important properties determining a crude's value are its density (measured as API specific gravity) and its sulphur content (measured per mass). Crude oil is considered "

text: heavy

text: " if it has long hydrocarbon chains, or "

text: light

text: " if it has short hydrocarbon chains: an API gravity of 34 or higher is "light", between 31-33 is "medium", and 30 or below is "heavy".Crude is considered "

text: sweet

text: " if it is low in sulphur content (< 0.5%/weight), or "

text: sour

text: " if high (> 1.0%/weight). Generally, the higher the API gravity (the "lighter" it is), the more valuable the crude.

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answers: The "lighter" it is

answers: NDQ_017283

answers: mass

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answers: Gravity

answers: NDQ_017290

answers: API gravity

text: Gravity yards are operated similarly to hump yards but, in contrast to the latter, the whole yard is set up on a continuous falling gradient. When they were invented in the 19th century, saving shunting engines and instead letting the cars roll by gravity was seen as a major benefit, whereas the larger amount of manual work required to stop the rolling cars in the classification tracks was judged to be not that important. Gravity yards were a historical step in the development of classification yards and were later judged as inferior to hump yards, because it became clear that shunting engines were needed anyway (at least in inclement weather like strong winds or icy temperatures when the oil in the bearings became thick), and because manual labour was getting relatively more and more expensive. Thus, only few gravity yards were ever built, sometimes requiring massive earthwork (one example is the first German gravity yard at Dresden).

text: Gravity yards are operated similarly to hump yards but, in contrast to the latter, the whole yard is set up on a continuous falling gradient. When they were invented in the 19th century, saving shunting engines and instead letting the cars roll by gravity was seen as a major benefit, whereas the larger amount of manual work required to stop the rolling cars in the classification tracks was judged to be not that important. Gravity yards were a historical step in the development of classification yards and were later judged as inferior to hump yards, because it became clear that shunting engines were needed anyway (at least in inclement weather like strong winds or icy temperatures when the oil in the bearings became thick), and because manual labour was getting relatively more and more expensive. Thus, only few gravity yards were ever built, sometimes requiring massive earthwork (one example is the first German gravity yard at Dresden).

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answers: Gravity acts only between objects that are touching

answers: NDQ_017283

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answers: NDQ_017284

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answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity yards

text: Zero gravity causes health problems in humans the severity of which depend on the length of exposure.  Space adaptation syndrome affects some astronauts but usually passes within 2 - 4 days. However, months or years of exposure to zero gravity causes a long list of health problems  including bone density loss, muscle atrophy, a compromised vestibular system, impaired eyesight, impaired mental ability, fatigue caused by loss of sleep, and a diminished immune system. There is an equally long list of maladies facing the astronauts when they return home, as they try to re-adjust to gravity here on Earth.Although not widely reported in the media, astronauts and cosmonauts who have been weightless for 6 months or more are too weak support their own body weight, and have to be carried from their spacecraft. The vast majority of astronauts and cosmonauts returning to Earth from a long duration space mission lasting 6 months or more are susceptible to dangerously low blood pressure, a condition known as Orthostatic Hypotension. This is caused in part by dehydration, but is also symptomatic of their weakened heart muscle which struggles against the force of gravity to maintain blood flow to the brain. This condition causes astronauts to feel dizzy. They may even pass out. This is a very serious problem for which there is presently no cure.Also, the astronauts report problems with hand-eye coordination. They fail hand-eye coordination tests that they had previously aced before going into space.The bone density loss mentioned previously may not be reversible, despite the 2 hours per day of load bearing exercise that the astronauts do whilst they are in orbit.Astronauts returning to Earth following a long duration spaceflight enter a rehabilitation program that can last up to a year. The purpose of the program is to help them rebuild their muscle strength. During this long recovery time they feel extremely vulnerable to bone fractures in particular.According to their own testimony, it takes astronauts 1 to 3 days to recover for every day that they have been weightless in space.

text: Zero gravity causes health problems in humans the severity of which depend on the length of exposure.

text: Space adaptation syndrome

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answers: Gravity acts only between objects that are touching

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answers: length

answers: NDQ_017284

answers: Earth

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: weightless

text: In fact, a ball falling from such a height wouldn't fall behind but ahead of the vertical because the rotational motion would be in ever-decreasing circles. What makes the earth move is similar to whatever moves Mars or Jupiter and is the same as that which pulls the stone to earth. Calling it gravity doesn't explain what it is.

text: In fact, a ball falling from such a height wouldn't fall behind but ahead of the vertical because the rotational motion would be in ever-decreasing circles. What makes the earth move is similar to whatever moves Mars or Jupiter and is the same as that which pulls the stone to earth. Calling it

text: gravity

text: doesn't explain what it is.

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answers: It doesn't

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answers: height

answers: NDQ_017284

answers: Jupiter

answers: NDQ_017286

answers: What makes the earth move

answers: NDQ_017290

answers: a ball

text: Conversely, the acceleration due to gravity, g, can be found by timing the movement of the weights, and calculating a value for the uniform acceleration a:

text: Conversely, the acceleration due to gravity, g, can be found by timing the movement of the weights, and calculating a value for the uniform acceleration a:

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text: The Final Gravity is the specific gravity measured at the completion of fermentation. The Apparent Extract, denoted

text: The Final Gravity is the specific gravity measured at the completion of fermentation. The Apparent Extract, denoted

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answers: 0: The answer is not relevant or complete at all.

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text: Eventually the satellite comes around to point D where Earth's gravity is now reducing the satellite's orbital velocity. This causes it to fall into a lower orbit, which actually increases the angular speed of the satellite around the Sun. This continues until point E where the satellite's orbit is now lower and faster than Earth's orbit, and it begins moving out ahead of Earth. Over the next few centuries it completes its journey back to point A.

text: Eventually the satellite comes around to point D where Earth's gravity is now reducing the satellite's orbital velocity. This causes it to fall into a lower orbit, which actually increases the angular speed of the satellite around the Sun. This continues until point E where the satellite's orbit is now lower and faster than

text: Earth's orbit

text: , and it begins moving out ahead of Earth. Over the next few centuries it completes its journey back to point A.

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text: With Battleworld crumbling since the Stranger's will is no longer holding it together, the Hood and the others escape, but not before Gravity sacrifices his life to save the group. While on Earth, he attends Gravity's funeral with Sara. Some time after this, Sara gives birth to his child. Gravity is returned to life a short time later.

text: With Battleworld crumbling since the Stranger's will is no longer holding it together, the Hood and the others escape, but not before Gravity sacrifices his life to save the group. While on Earth, he attends Gravity's funeral with Sara. Some time after this, Sara gives birth to his child. Gravity is returned to life a short time later.

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answers: It acts only between objects that are touching

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text: The weight of a solid core reactor was initially thought to be its main drawback. Immediately after World War II, a complete nuclear reactor was so heavy that it was feared that solid core nuclear thermal engines would be hard-pressed  to achieve a thrust-to-weight ratio of 1:1, which is needed to overcome the gravity of the Earth at launch.  This problem was quickly overcome, however, and over the next twenty-five years U.S. nuclear thermal rocket designs eventually reached thrust-to-weight ratios of approximately 7:1.  This is still a much lower thrust-to-weight ratio than what is achievable with chemical rockets, which have thrust-to-weight ratios on the order of 70:1. That fact, when combined with the large tanks necessary for liquid hydrogen (or other working fluid) storage, means that solid core nuclear thermal engines are best suited for a) use in upper stages, where vehicle velocity is already near orbital, or b) in space "tugs", or intra Solar System transports, which would be used to take payloads and/or people between gravity wells, or c) for launches from a planet smaller than Earth, a planetoid (or "dwarf planet"), an asteroid, or a moon where the required thrust is lower due to lower gravity fields. Currently then, for a solid core nuclear thermal rocket to be more useful than chemical rockets as a first or second stage Earth launch engine, the system would either have to be made much lighter, or provide even higher specific impulse. Until that day, it can be said that the true strength of nuclear rockets currently lies in solar system exploration, outside Earth's gravity well.

text: The weight of a solid core reactor was initially thought to be its main drawback. Immediately after World War II, a complete nuclear reactor was so heavy that it was feared that solid core nuclear thermal engines would be hard-pressed  to achieve a

text: thrust-to-weight ratio

text: of 1:1, which is needed to overcome the

text: gravity

text: of the Earth at launch.  This problem was quickly overcome, however, and over the next twenty-five years U.S. nuclear thermal rocket designs eventually reached thrust-to-weight ratios of approximately 7:1.  This is still a much lower thrust-to-weight ratio than what is achievable with chemical rockets, which have thrust-to-weight ratios on the order of 70:1. That fact, when combined with the large tanks necessary for liquid hydrogen (or other working fluid) storage, means that solid core nuclear thermal engines are best suited for a) use in upper stages, where vehicle velocity is already near orbital, or b) in space "tugs", or intra Solar System transports, which would be used to take payloads and/or people between

text: gravity well

text: s, or c) for launches from a planet smaller than Earth, a planetoid (or "dwarf planet"), an asteroid, or a moon where the required thrust is lower due to lower gravity fields. Currently then, for a solid core nuclear thermal rocket to be more useful than chemical rockets as a first or second stage Earth launch engine, the system would either have to be made much lighter, or provide even higher specific impulse. Until that day, it can be said that the true strength of nuclear rockets currently lies in solar system exploration, outside Earth's gravity well.

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answers: 2: The answer has limited relevance and completeness, with noticeable gaps or inaccuracy.

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text: Both AllHipHop and Billboard were very positive toward Gravity after a preview listening session, considering it Lecrae's strongest and most mainstream work to date. AllHipHop stated that "overall, it appears that Lecrae is ready to offer one of his most broad and, dare-we-say, mainstream albums in terms of sound; yet, it still manages to capture the trueness of what he has always stood for and rapped about. If anything, Gravity is a giant step forward for his expanding career, and it will surely be a welcome addition to many 'Top 10' lists when 2012 comes to a close." Indie Vision Music in announcing the cover of Gravity called the album "likely the biggest Christian hip hop album yet". AllHipHop listed "Mayday" as one of the standout tracks on the album, noting the "beautiful" melody and hook by Ashthon Jones. The reviewer considered "Violence" a personal favorite, calling Lecrae's line "Grew up under Tupac, bible verse and two glocks" one of the most powerful lines on the album. Parlé Magazine also was favorable to the song, stating "That track is definitely going places." Jonathan Landrum of The Associated Press was favorable to the album, saying that "in his sixth album 'Gravity,' Lecrae delivers a strong piece of work. He's not afraid to rap about his past mistakes, supplying inspirational rhymes filled with Christian values backed by well-produced secular hip-hop beats." In its track-by-track review of the album, The Boombox stated that "based on the warm reception to Church Clothes, this LP is set to stir the pot further in the realm of both of hip-hop and Christianity." David Jeffries of Allmusic gave the album four out of five stars, declaring that Lecrae makes Gravitys various genre experiments and jumps in style "sound effortless and natural". He asserted that "while Rehab is the more rewarding album in the end, this one is more persuasive and immediate, making it an easy entry point into this gifted artist's discography."

text: Both AllHipHop and Billboard were very positive toward Gravity after a preview listening session, considering it Lecrae's strongest and most mainstream work to date. AllHipHop stated that "overall, it appears that Lecrae is ready to offer one of his most broad and, dare-we-say, mainstream albums in terms of sound; yet, it still manages to capture the trueness of what he has always stood for and rapped about. If anything, Gravity is a giant step forward for his expanding career, and it will surely be a welcome addition to many 'Top 10' lists when 2012 comes to a close." Indie Vision Music in announcing the cover of Gravity called the album "likely the biggest Christian hip hop album yet". AllHipHop listed "Mayday" as one of the standout tracks on the album, noting the "beautiful" melody and hook by Ashthon Jones. The reviewer considered "Violence" a personal favorite, calling Lecrae's line "Grew up under

text: Tupac

text: , bible verse and two

text: glock

text: s" one of the most powerful lines on the album. Parlé Magazine also was favorable to the song, stating "That track is definitely going places." Jonathan Landrum of

text: The Associated Press

text: was favorable to the album, saying that "in his sixth album 'Gravity,' Lecrae delivers a strong piece of work. He's not afraid to rap about his past mistakes, supplying inspirational rhymes filled with Christian values backed by well-produced secular hip-hop beats." In its track-by-track review of the album, The Boombox stated that "based on the warm reception to Church Clothes, this LP is set to stir the pot further in the realm of both of hip-hop and Christianity." David Jeffries of

text: Allmusic

text: gave the album four out of five stars, declaring that Lecrae makes Gravitys various genre experiments and jumps in style "sound effortless and natural". He asserted that "while Rehab is the more rewarding album in the end, this one is more persuasive and immediate, making it an easy entry point into this gifted artist's discography."

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text: The factors that affect an object's gravitational potential energy are its height relative to some reference point, its mass, and the strength of the gravitational field it is in. Thus, a book lying on a table has less gravitational potential energy than the same book on top of a taller cupboard, and less gravitational potential energy than a heavier book lying on the same table. An object at a certain height above the Moon's surface has less gravitational potential energy than at the same height above the Earth's surface because the Moon's gravity is weaker. Note that "height" in the common sense of the term cannot be used for gravitational potential energy calculations when gravity is not assumed to be a constant. The following sections provide more detail.

text: The factors that affect an object's gravitational potential energy are its height relative to some reference point, its mass, and the strength of the gravitational field it is in. Thus, a book lying on a table has less gravitational potential energy than the same book on top of a taller cupboard, and less gravitational potential energy than a heavier book lying on the same table. An object at a certain height above the Moon's surface has less gravitational potential energy than at the same height above the Earth's surface because the Moon's gravity is weaker. Note that "height" in the common sense of the term cannot be used for gravitational potential energy calculations when gravity is not assumed to be a constant. The following sections provide more detail.

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text: When a gravity current encounters a solid boundary, it can either overcome the boundary, by flowing around or over it, or be reflected by it. The actual outcome of the collision depends primarily on the height and width of the obstacle. If the obstacle is shallow (part) of the gravity current will overcome the obstacle by flowing over it. Similarly, if the width of the obstacle is small, the gravity current will flow around it, just like a river flows around a boulder.

text: When a gravity current encounters a solid boundary, it can either overcome the boundary, by flowing around or over it, or be reflected by it. The actual outcome of the collision depends primarily on the height and width of the obstacle. If the obstacle is shallow (part) of the gravity current will overcome the obstacle by flowing over it. Similarly, if the width of the obstacle is small, the gravity current will flow around it, just like a river flows around a boulder.

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answers: Gravity current encounters a solid boundary

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answers: Gravity

text: Loop quantum gravity (LQG) predicts no additional spatial dimensions, nor anything else about particle physics. These theories can be formulated in three spatial dimensions and one dimension of time, although in some LQG theories dimensionality is an emergent property of the theory, rather than a fundamental assumption of the theory. Also, LQG is a theory of quantum gravity which does not require supersymmetry. Lee Smolin, one of the originators of LQG, has proposed that a loop quantum gravity theory incorporating either supersymmetry or extra dimensions, or both, be called "loop quantum gravity II".

text: Loop quantum gravity

text: (LQG) predicts no additional spatial dimensions, nor anything else about particle physics. These theories can be formulated in three spatial dimensions and one dimension of time, although in some LQG theories dimensionality is an

text: emergent property

text: of the theory, rather than a fundamental assumption of the theory. Also, LQG is a theory of quantum gravity which does not require supersymmetry.

text: Lee Smolin

text: , one of the originators of LQG, has proposed that a loop quantum gravity theory incorporating either supersymmetry or extra dimensions, or both, be called "loop quantum gravity II".

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answers: Quantum gravity

text: Players can change the gravity between “normal” earth like gravity and low gravity by holding the L1/LB/Shift button. Controlling the gravity is the key feature of the game and allows the player for example to jump higher in low gravity, alter trajectories of thrown objects, soar in the air flow of a huge ventilation fan in low gravity, do a Recoil Jump, Lift heavy objects in low G, swing on certain objects using the Gravity Beam. Some levels have sections where the gravity is inverted. In some levels the player can invert the gravity by himself.

text: Players can change the gravity between “normal” earth like gravity and low gravity by holding the L1/LB/Shift button. Controlling the gravity is the key feature of the game and allows the player for example to jump higher in low gravity, alter trajectories of thrown objects, soar in the air flow of a huge ventilation fan in low gravity, do a Recoil Jump, Lift heavy objects in low G, swing on certain objects using the Gravity Beam. Some levels have sections where the gravity is inverted. In some levels the player can invert the gravity by himself.

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answers: Gravity acts only between objects that are touching

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answers: Gravity

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answers: LB

text: Gravity is the weakest of the four fundamental interactions of nature. The gravitational attraction is approximately 10 times weaker than the strong force, 10 times weaker than the electromagnetic force and 10 times weaker than the weak force. As a consequence, gravity has a negligible influence on the behavior of subatomic particles, and plays no role in determining the internal properties of everyday matter (but see quantum gravity). On the other hand, gravity is the dominant interaction at the macroscopic scale, and is the cause of the formation, shape and trajectory (orbit) of astronomical bodies. It is responsible for various phenomena observed on Earth and throughout the Universe; for example, it causes the Earth and the other planets to orbit the Sun, the Moon to orbit the Earth, the formation of tides, the formation and evolution of the Solar System, stars and galaxies.

text: Gravity is the weakest of the four

text: fundamental interaction

text: s of nature. The gravitational attraction is approximately 10 times weaker than the

text: strong force

text: , 10 times weaker than the

text: electromagnetic force

text: and 10 times weaker than the

text: weak force

text: . As a consequence, gravity has a negligible influence on the behavior of subatomic particles, and plays no role in determining the internal properties of everyday matter (but see

text: quantum gravity

text: ). On the other hand, gravity is the dominant interaction at the

text: macroscopic scale

text: , and is the cause of the formation, shape and

text: trajectory

text: orbit

text: ) of astronomical bodies. It is responsible for various phenomena observed on Earth and throughout the Universe; for example, it causes the Earth and the other planets to orbit the Sun, the

text: Moon

text: to orbit the Earth, the formation of

text: tide

text: s, the

entity_name: Formation and evolution of the Solar System

text: formation and evolution of the Solar System

text: stars

text: and

text: galaxies

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answers: It is the dominant interaction at the macroscopic scale

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answers: Gravity

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answers: Gravity

text: A rough conversion between Brix, degrees Plato or degrees Balling and specific gravity can be made by dividing the number behind the decimal point in the SG (which is often referred to as gravity points) by 4. So a specific gravity of 1.048 has 48 gravity points. 48 divided by 4 is 12 degrees Plato, Balling or Brix. This conversion method is pretty accurate up to a specific gravity of 1.070 at which point the approximation begins to deviate from the actual conversion.

text: A rough conversion between Brix, degrees Plato or degrees Balling and specific gravity can be made by dividing the number behind the decimal point in the SG (which is often referred to as gravity points) by 4. So a specific gravity of 1.048 has 48 gravity points. 48 divided by 4 is 12 degrees Plato, Balling or Brix. This conversion method is pretty accurate up to a specific gravity of 1.070 at which point the approximation begins to deviate from the actual conversion.

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answers: It acts only between objects that are touching.

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text: API gravity is thus an inverse measure of a petroleum liquid's density relative to that of water (also known as specific gravity). It is used to compare densities of petroleum liquids. For example, if one petroleum liquid is less dense than another, it has a greater API gravity. Although mathematically, API gravity is a dimensionless quantity, see the formula below, it is referred to as being in 'degrees'. API gravity is graduated in degrees on a hydrometer instrument. API gravity values of most petroleum liquids  fall between 10 and 70 degrees.

text: API gravity is thus an inverse measure of a petroleum liquid's

text: density

text: relative to that of water (also known as

text: specific gravity

text: ). It is used to compare densities of

text: petroleum liquids

text: . For example, if one petroleum liquid is less dense than another, it has a greater API gravity. Although mathematically, API gravity is a

text: dimensionless quantity

text: , see the formula below, it is referred to as being in 'degrees'. API gravity is graduated in degrees on a

text: hydrometer

text: instrument. API gravity values of most petroleum liquids  fall between 10 and 70 degrees.

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answers: API gravity

text: Its weight will be less on Mars (where gravity is weaker), more on Saturn, and negligible in space when far from any significant source of gravity, but it will always have the same mass.

text: Its weight will be less on

text: Mars

text: (where gravity is weaker), more on

text: Saturn

text: , and negligible in space when far from any significant source of gravity, but it will always have the same mass.

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text: Historically, the terms "gravity spreading" and "gravity gliding" have been used with little distinction between the two, or even interchangeably. This page follows the convention of "Excursus on gravity gliding and gravity spreading" by D.D. Schultz-Ela, where gravity spreading is defined as a lateral extension and vertical contraction, and thus must be applied to a non-rigid body. Gravity gliding, meanwhile, is applied to a block which is not being deformed, and is therefore less common to observe. However, it can be difficult to distinguish between the two in real world scenarios, and often both are occurring simultaneously.

text: Historically, the terms "gravity spreading" and "gravity gliding" have been used with little distinction between the two, or even interchangeably. This page follows the convention of "Excursus on gravity gliding and gravity spreading" by D.D. Schultz-Ela, where gravity spreading is defined as a lateral extension and vertical contraction, and thus must be applied to a non-rigid body. Gravity gliding, meanwhile, is applied to a block which is not being deformed, and is therefore less common to observe. However, it can be difficult to distinguish between the two in real world scenarios, and often both are occurring simultaneously.

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answers: Yes

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answers: Gravity gliding

text: However, it is not known what the load distribution was in the holds, or even in the cabin, since no loading plan was made. The only thing that could be determined was that the forward hold was full of baggage. Equally, the airplane’s dry operating index, that is to say its empty center of gravity, could not be identified. On the documents from Lebanon, two different indices had been used. It was not therefore possible to reconstitute the airplane’s center of gravity as it was on 25 December.

text: However, it is not known what the load distribution was in the holds, or even in the cabin, since no loading plan was made. The only thing that could be determined was that the forward hold was full of baggage. Equally, the airplane’s dry operating index, that is to say its empty center of gravity, could not be identified. On the documents from Lebanon, two different indices had been used. It was not therefore possible to reconstitute the airplane’s center of gravity as it was on 25 December.

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text: While the weight of an object is dependent upon the strength of the local gravitational field, the mass of an object is independent of gravity, as mass is a measure of how much matter an object contains. Accordingly, for astronauts in microgravity, no effort is required to hold objects off the cabin floor; they are "weightless". However, since objects in microgravity still retain their mass and inertia, an astronaut must exert ten times as much force to accelerate a 10kilogram object at the same rate as a 1kilogram object.

text: While the

text: weight

text: of an object is dependent upon the strength of the local

text: gravitational field

text: , the mass of an object is independent of gravity, as mass is a measure of how much matter an object contains. Accordingly, for astronauts in

text: microgravity

text: , no effort is required to hold objects off the cabin floor; they are "weightless". However, since objects in microgravity still retain their mass and inertia, an astronaut must exert ten times as much force to accelerate a 10kilogram object at the same rate as a 1kilogram object.

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answers: weight of an object is dependent upon the strength of the local gravitational field

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text: If the actual force of gravity on the object is needed, this can be calculated by multiplying the mass measured by the balance by the acceleration due to gravity – either standard gravity (for everyday work) or the precise local gravity (for precision work).  Tables of the gravitational acceleration at different locations can be found on the web.

text: If the actual force of gravity on the object is needed, this can be calculated by multiplying the mass measured by the balance by the acceleration due to gravity – either standard gravity (for everyday work) or the precise local gravity (for precision work).  Tables of the gravitational acceleration at different locations can be found on the web.

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answers: It does not

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answers: Yes

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text: Gravity-cast magnesium wheels have been in production since the early 1920s and provide good ductility, and relative properties above what can be made with aluminum casting. Tooling costs for gravity-cast wheels are among the cheapest of any process. This has allowed small batch production, flexibility in design and short development time.

text: Gravity-cast magnesium wheels have been in production since the early 1920s and provide good ductility, and relative properties above what can be made with aluminum casting. Tooling costs for gravity-cast wheels are among the cheapest of any process. This has allowed small batch production, flexibility in design and short development time.

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: Gravity offers Content Personalization by using something they developed using the "interest graph" to tailor specific interests of each user on social websites. The "interest graph" uses real time ingestion to process content and behavior data. The data then gets a Semantic and a Virility analysis and the "interest graph" is created according to each specific user. Gravity also uses these graphs in relation to specific brands. The data presented in these graphs give specific information on what customers a company has and their preferences. The companies using Gravity "interest graphs" are able to directly see what their customers want and expect. The graphs enable brands to eliminate focus groups, market research, surveys, etc.

text: Gravity offers Content Personalization by using something they developed using the "interest graph" to tailor specific interests of each user on

text: social website

text: s. The "interest graph" uses real time ingestion to process content and behavior data. The data then gets a Semantic and a

text: Virility

text: analysis and the "interest graph" is created according to each specific user. Gravity also uses these graphs in relation to specific brands. The data presented in these graphs give specific information on what customers a company has and their preferences. The companies using Gravity "interest graphs" are able to directly see what their customers want and expect. The graphs enable brands to eliminate

text: focus group

text: s,

text: market research

text: , surveys, etc.

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answers: Gravity

answers: NDQ_017290

answers: "interest graph"

text: At present it has not been established whether the gravity of Mars, 0.38 times that of the Earth, would be sufficient to avoid bone decalcification and loss of muscle tone experienced by astronauts living in an environment of microgravity. In contrast, Venus is close in size and mass to the Earth, resulting in a similar surface gravity (0.904 g) that would likely be sufficient to prevent the health problems associated with weightlessness. Most other space exploration and colonization plans face concerns about the damaging effect of long-term exposure to fractional g or zero gravity on the human musculoskeletal system.

text: At present it has not been established whether the gravity of Mars, 0.38 times that of the Earth, would be sufficient to avoid

text: bone decalcification

text: and loss of muscle tone experienced by astronauts living in an environment of

text: microgravity

text: . In contrast, Venus is close in size and mass to the Earth, resulting in a similar surface gravity (0.904

text: g

text: ) that would likely be sufficient to prevent the health problems associated with

text: weightlessness

text: . Most other space exploration and colonization plans face concerns about the damaging effect of long-term exposure to fractional g or

text: zero gravity

text: on the human

text: musculoskeletal system

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answers: Gravity acts only between objects that are touching

answers: NDQ_017283

answers: mass

answers: NDQ_017284

answers: Mars

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: g

text: The common distribution of a flame under normal gravity conditions depends on convection, because soot tends to rise to the top of a flame, such as in a candle, making the flame yellow. In microgravity or zero gravity, such as an environment in outer space, convection no longer occurs, and the flame becomes spherical, with a tendency to become more blue and more efficient. There are several possible explanations for this difference, of which the most likely one given is the hypothesis that the temperature is evenly distributed enough that soot is not formed and complete combustion occurs., National Aeronautics and Space Administration, April 2005. Experiments by NASA in microgravity reveal that diffusion flames in microgravity allow more soot to be completely oxidised after they are produced than diffusion flames on Earth, because of a series of mechanisms that behaved differently in microgravity when compared to normal gravity conditions.LSP-1 experiment results, National Aeronautics and Space Administration, April 2005. Premixed flames in microgravity burn at a much slower rate and more efficiently than even a candle on Earth, and last much longer.

text: The common distribution of a flame under normal gravity conditions depends on

text: convection

text: , because soot tends to rise to the top of a flame, such as in a candle, making the flame yellow. In microgravity or

text: zero gravity

text: , such as an environment in

text: outer space

text: , convection no longer occurs, and the flame becomes

text: spherical

text: , with a tendency to become more blue and more efficient. There are several possible explanations for this difference, of which the most likely one given is the hypothesis that the temperature is evenly distributed enough that soot is not formed and complete combustion occurs., National Aeronautics and Space Administration, April 2005. Experiments by NASA in microgravity reveal that

text: diffusion flame

text: s in microgravity allow more soot to be completely oxidised after they are produced than diffusion flames on Earth, because of a series of mechanisms that behaved differently in microgravity when compared to normal gravity conditions.LSP-1 experiment results, National Aeronautics and Space Administration, April 2005.

text: Premixed flame

text: s in microgravity burn at a much slower rate and more efficiently than even a candle on Earth, and last much longer.

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answers: NDQ_017290

answers: Gravity

text: Facilities using diamagnetism may prove workable for laboratories simulating low gravity conditions here on Earth. The mouse was levitated against Earth's gravity, creating a condition similar to microgravity. Lower forces may also be generated to simulate a condition similar to lunar or Martian gravity with small model organisms.

text: Facilities using diamagnetism may prove workable for laboratories simulating low gravity conditions here on Earth. The mouse was levitated against Earth's gravity, creating a condition similar to

text: microgravity

text: . Lower forces may also be generated to simulate a condition similar to lunar or Martian gravity with small

text: model organisms

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text: Yet, another factor is that political centers of gravity have changed. These centers of gravity may revolve around nationalism, religion, or family or clan honor.

text: Yet, another factor is that political centers of gravity have changed. These centers of gravity may revolve around

text: nationalism

text: religion

text: , or family or clan honor.

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text: Because metallic minerals have higher specific gravities than most gangue (waste) minerals, concentrating the milling ore was done in various gravity classifiers. The early Michigan copper mines used buddles. Later copper mining used improved gravity-classification machinery, including jigs, vanners, and Wilfley tables.

text: Because metallic minerals have higher specific gravities than most gangue (waste) minerals, concentrating the milling ore was done in various gravity classifiers. The early Michigan copper mines used buddles. Later copper mining used improved gravity-classification machinery, including jigs, vanners, and Wilfley tables.

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text: While technological capabilities can facilitate an effects-base approach to operations, emphasizing tools and tactics miss the fact EBO is a methodology or a way of thinking—it is not a fixed set of tactics, techniques, and procedures.  An effects-based approach starts with the end-game of action as the starting point in planning the appropriate application of each of the elements of security—diplomatic, information, military, and economic—to reach the desired end-state. Accordingly, EBO concepts traditionally take a "systemic approach" to  security challenges, evaluating the situation through the lens of strategic centers of gravity—leadership; key essentials; infrastructure; population; and military forces.  Each of these strategic centers of gravity can be decomposed into operational centers of gravity, and each of those into tactical centers of gravity.    EBO is an approach that looks at the totality of the system being acted upon and determining what are the most effective means to achieve the desired end state.

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answers: An effects-based approach

text: What we now call gravity was not identified as a universal force until the work of Isaac Newton. Before Newton, the tendency for objects to fall towards the Earth was not understood to be related to the motions of celestial objects. Galileo was instrumental in describing the characteristics of falling objects by determining that the acceleration of every object in free-fall was constant and independent of the mass of the object. Today, this acceleration due to gravity towards the surface of the Earth is usually designated as

text: What we now call gravity was not identified as a universal force until the work of Isaac Newton. Before Newton, the tendency for objects to fall towards the Earth was not understood to be related to the motions of celestial objects. Galileo was instrumental in describing the characteristics of falling objects by determining that the

text: acceleration

text: of every object in

text: free-fall

text: was constant and independent of the mass of the object. Today, this

text: acceleration due to gravity

text: towards the surface of the Earth is usually designated as

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text: A gravity well or gravitational well is a conceptual model of the gravitational field surrounding a body in space – the more massive the body, the deeper and more extensive the gravity well associated with it. The Sun is very massive, relative to other bodies in the Solar System, so the corresponding gravity well that surrounds it appears "deep" and far-reaching. The gravity wells of asteroids and small moons, conversely, are often depicted as very shallow. Anything on the surface of a planet or moon is considered to be at the bottom of that celestial body's gravity well, and so escaping the effects of gravity from such a planet or moon (to enter outer space) is sometimes called "climbing out of the gravity well". The deeper a gravity well is, the more energy any space-bound "climber" must use to escape it.

text: A gravity well or gravitational well is a conceptual model of the gravitational field surrounding a body in space – the more massive the body, the deeper and more extensive the gravity well associated with it. The

text: Sun

text: is very massive, relative to other bodies in the

text: Solar System

text: , so the corresponding gravity well that surrounds it appears "deep" and far-reaching. The gravity wells of asteroids and small moons, conversely, are often depicted as very shallow. Anything on the surface of a planet or moon is considered to be at the bottom of that celestial body's gravity well, and so escaping the effects of

text: gravity

text: from such a planet or moon (to enter outer space) is sometimes called "climbing out of the gravity well". The deeper a gravity well is, the more energy any space-bound "climber" must use to

text: escape it

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answers: It acts only between objects that are touching

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answers: Anything on the surface of a planet or moon

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answers: Gravity

text: where g is the acceleration due to gravity at the Earth's surface.

text: where g is the

text: acceleration due to gravity

text: at the Earth's surface.

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text: The Twaddell scale is a hydrometer scale for reporting the measured specific gravity of a liquid relative to water. On this scale, a specific gravity of 1.000 is reported as 0, and 2.000 reports as 200. Concentrated sulfuric acid with a specific gravity of 1.8 has a Twaddell scale measurement of 160 (as per the linear relationship between readings and sp. gravity). The Twaddell scale is only used for liquids with specific gravity greater than water.  The scale was used in the British dye and bleach manufacturing industries. While the Baumé scale was adopted throughout England, the Twaddell scale was used in England and Scotland.

text: The Twaddell scale is a

text: hydrometer

text: scale for reporting the measured

text: specific gravity

text: of a liquid relative to water. On this scale, a specific gravity of 1.000 is reported as 0, and 2.000 reports as 200. Concentrated sulfuric acid with a specific gravity of 1.8 has a Twaddell scale measurement of 160 (as per the linear relationship between readings and sp. gravity). The Twaddell scale is only used for liquids with specific gravity greater than water.  The scale was used in the British dye and bleach manufacturing industries. While the

text: Baumé scale

text: was adopted throughout England, the Twaddell scale was used in England and Scotland.

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answers: Gravity acts only between objects that are touching

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text: Self-gravity is influential in understanding sea level and the ice caps for oceanographers and geologists, which is particularly important as we go forward trying to anticipate the effects of climate change. The deformation on the Earth from the forces of the oceans can be calculated if the Earth is treated as fluid and the effects of self-gravity are taken into account and this allowed for the influence of ocean tide loading to be taken into account when observing the Earth's deformation response to harmonic surface loading. The results of calculating post-glacial sea levels near the ice caps are significantly different when using a flat Earth model that does not take self-gravity into account, as opposed to a spherical Earth where self-gravity is taken into account because of the sensitivity of the data in these regions, which shows how results can drastically change when self-gravity is ignored. There has also been research done to better understand Laplace's Tidal Equations to try to understand how deformation of the Earth and self-gravity within the ocean affect the M2 tidal constituent (the tides dictated by the Moon). There have been suggestions that if the Greenland ice complex melts, the sea level will actually fall around Greenland and rise in areas further away because the effects of self-gravity .

text: Self-gravity is influential in understanding

text: sea level

text: and the

text: ice cap

text: s for oceanographers and geologists, which is particularly important as we go forward trying to anticipate the effects of

text: climate change

text: . The deformation on the Earth from the forces of the oceans can be calculated if the Earth is treated as

text: fluid

text: and the effects of self-gravity are taken into account and this allowed for the influence of

text: ocean tide

text: loading to be taken into account when observing the Earth's deformation response to

text: harmonic

text: surface loading. The results of calculating

text: post-glacial

text: sea levels near the ice caps are significantly different when using a flat Earth model that does not take self-gravity into account, as opposed to a spherical Earth where self-gravity is taken into account because of the sensitivity of the data in these regions, which shows how results can drastically change when self-gravity is ignored. There has also been research done to better understand

text: Laplace's Tidal Equations

text: to try to understand how deformation of the Earth and self-gravity within the ocean affect the

text: M2 tidal constituent

text: (the tides dictated by the

text: Moon

text: ). There have been suggestions that if the

text: Greenland ice complex

text: melts, the sea level will actually fall around

text: Greenland

text: and rise in areas further away because the effects of self-gravity .

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answers: NDQ_017290

answers: Gravity

text: According to Newton's 3rd Law, the Earth itself experiences a force equal in magnitude and opposite in direction to that which it exerts on a falling object.  This means that the Earth also accelerates towards the object until they collide.  Because the mass of the Earth is huge, however, the acceleration imparted to the Earth by this opposite force is negligible in comparison to the object's.  If the object doesn't bounce after it has collided with the Earth, each of them then exerts a repulsive contact force on the other which effectively balances the attractive force of gravity and prevents further acceleration.

text: According to

text: Newton's 3rd Law

text: , the Earth itself experiences a

text: force

text: equal in magnitude and opposite in direction to that which it exerts on a falling object.  This means that the Earth also accelerates towards the object until they collide.  Because the mass of the Earth is huge, however, the acceleration imparted to the Earth by this opposite force is negligible in comparison to the object's.  If the object doesn't bounce after it has collided with the Earth, each of them then exerts a repulsive

text: contact force

text: on the other which effectively balances the attractive force of gravity and prevents further acceleration.

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answers: The Earth also accelerates towards the object until they collide

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answers: Newton's 3rd Law

answers: NDQ_017290

answers: The mass of the Earth

text: The model makes extensive use of gravity or interaction decaying with distance functions.  Use of “gravity model” ideas was common at the time Lowry developed his model; indeed, the idea of the gravity model was at least 100 years old at the time.  It was under much refinement at the time of Lowry’s work; persons such as Alan Voorhees, Mort Schneider, John Hamburg, Roger Creighon, and Walter Hansen made important contributions.  (See Carrothers 1956).

text: The model makes extensive use of

text: gravity or interaction decaying with distance

text: functions.  Use of “gravity model” ideas was common at the time Lowry developed his model; indeed, the idea of the gravity model was at least 100 years old at the time.  It was under much refinement at the time of Lowry’s work; persons such as

text: Alan Voorhees

text: Mort Schneider

text: John Hamburg

text: Roger Creighon

text: , and

text: Walter Hansen

text: made important contributions.  (See Carrothers 1956).

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answers: It was under much refinement

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answers: Lowry

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity

text: Assuming error-free measurements, if the Earth's gravity field were completely regular and gravity constant, leveling loops would always close precisely:

text: Assuming error-free measurements, if the Earth's gravity field were completely regular and gravity constant, leveling loops would always close precisely:

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answers: 2: The answer has limited relevance and completeness, with noticeable gaps or inaccuracies.

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answers: Gravity acts only between objects that are touching.

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answers: Earth's gravity field

answers: NDQ_017290

answers: Error-free measurements

text: A density meter does not measure the specific gravity of a sample directly. However, the specific gravity can be inferred from a density meter. The specific gravity is defined as the density of a sample compared to the density of a reference. The reference density is typically of that of water. The specific gravity is found by the following equation:

text: A density meter does not measure the

text: specific gravity

text: of a sample directly. However, the specific gravity can be inferred from a density meter. The specific gravity is defined as the density of a sample compared to the density of a reference. The reference density is typically of that of water. The specific gravity is found by the following equation:

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answers: It acts only between objects that are touching.

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answers: The specific gravity is defined as the density of a sample compared to the density of a reference

answers: NDQ_017290

answers: The specific gravity is found by the equation

text: Space stations in the past (up to 200 years before the action of Shards of Honor) were null-g or used centrifugal force to generate partial gravity, but now they use artificial gravity. Falling Free and Diplomatic Immunity explore the relationship between a null-g culture and one which depends on gravity.

text: Space stations in the past (up to 200 years before the action of Shards of Honor) were null-g or used centrifugal force to generate partial gravity, but now they use

text: artificial gravity

text: . Falling Free and Diplomatic Immunity explore the relationship between a null-g culture and one which depends on gravity.

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: In 2067, scientists attempt to harness energy from gravity. The gravity reverses, however, and nearly everyone and everything are sent flying from Earth.

text: In 2067, scientists attempt to harness energy from gravity. The gravity reverses, however, and nearly everyone and everything are sent flying from Earth.

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answers: Gravity acts only between objects that are touching

answers: NDQ_017283

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: Geodesy, also called geodetics, deals with the measurement and representation of the planets of the Solar System, their gravitational fields and geodynamic phenomena (polar motion in three-dimensional, time-varying space. The science of geodesy has elements of both astrophysics and planetary sciences. The shape of the Earth is to a large extent the result of its rotation, which causes its equatorial bulge, and the competition of geologic processes such as the collision of plates and of vulcanism, resisted by the Earth's gravity field. These principles can be applied to the solid surface of Earth (orogeny; Few mountains are higher than , few deep sea trenches deeper than that because quite simply, a mountain as tall as, for example, , would develop so much pressure at its base, due to gravity, that the rock there would become plastic, and the mountain would slump back to a height of roughly  in a geologically insignificant time. Some or all of these geologic principles can be applied to other planets besides Earth. For instance on Mars, whose surface gravity is much less, the largest volcano, Olympus Mons, is  high at its peak, a height that could not be maintained on Earth. The Earth geoid is essentially the figure of the Earth abstracted from its topographic features. Therefore, the Mars geoid is essentially the figure of Mars abstracted from its topographic features. Surveying and mapping are two important fields of application of geodesy.

text: Geodesy

text: , also called geodetics, deals with the measurement and representation of the planets of the Solar System, their

text: gravitation

text: al fields and geodynamic phenomena (

text: polar motion

text: in three-dimensional, time-varying space. The science of geodesy has elements of both astrophysics and planetary sciences. The shape of the Earth is to a large extent the result of its rotation, which causes its equatorial bulge, and the competition of geologic processes such as the collision of plates and of

text: vulcanism

text: , resisted by the Earth's

text: gravity

text: field. These principles can be applied to the solid surface of Earth (

text: orogeny

text: ; Few mountains are higher than , few deep sea trenches deeper than that because quite simply, a mountain as tall as, for example, , would develop so much

text: pressure

text: at its base, due to gravity, that the rock there would become

text: plastic

text: , and the mountain would slump back to a height of roughly  in a geologically insignificant time. Some or all of these geologic principles can be applied to other planets besides Earth. For instance on Mars, whose surface gravity is much less, the largest volcano,

text: Olympus Mons

text: , is  high at its peak, a height that could not be maintained on Earth. The Earth

text: geoid

text: is essentially the figure of the Earth abstracted from its topographic features. Therefore, the Mars geoid is essentially the figure of Mars abstracted from its topographic features.

text: Surveying

text: and

text: map

text: ping are two important fields of application of geodesy.

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text: The primary objective of a belt press filter is to dewater process sludge and much of this dewatering occurs in the gravity drainage zone. The gravity drainage zone can achieve a 5 to 10 percent increase in solids concentration. The degree of dewatering in the gravity drainage zone is greatly dependent on the type of solids, the filter media and the sludge conditioning. The dewatering achieved in the gravity drainage zone is adversely affected if the sludge is poorly spread across the belt or the residence time is insufficient. Sludge conditioning is the addition of chemicals to promote flocculation of particles to form a thickened sludge and to promote dewatering. Dewatering can be promoted by the addition of surfactant and flocculation is achieved via the addition of high molecular weight polymer. Flocculation is improved with optimum polymer dosage, polymer dilution and mixing. The pH of the feed slurry must also be monitored and controlled as low pH decreases flocculation. It is important to find the optimum value for each conditioning parameter as too much polymer or mixing can have a negative impact on flocculation and greatly increase operating expenses. The effects of sludge conditioning are most apparent in the gravity drainage zone which can be easily replicated on a laboratory scale where the optimum conditioning strategy can be determined. For a belt press filter to be industrially viable it must be economically efficient and thus maximum throughput is desired. Without sufficient conditioning, the gravity drainage is generally the limiting process step, but with optimum dilution the limiting process step can be shifted to the compression zone.

text: The primary objective of a belt press filter is to dewater process sludge and much of this dewatering occurs in the gravity drainage zone. The gravity drainage zone can achieve a 5 to 10 percent increase in solids concentration. The degree of dewatering in the gravity drainage zone is greatly dependent on the type of solids, the filter media and the sludge conditioning. The dewatering achieved in the gravity drainage zone is adversely affected if the sludge is poorly spread across the belt or the residence time is insufficient. Sludge conditioning is the addition of chemicals to promote

text: flocculation

text: of particles to form a thickened sludge and to promote dewatering. Dewatering can be promoted by the addition of

text: surfactant

text: and flocculation is achieved via the addition of high molecular weight polymer. Flocculation is improved with optimum polymer dosage, polymer dilution and mixing. The

text: pH

text: of the feed slurry must also be monitored and controlled as low pH decreases flocculation. It is important to find the optimum value for each conditioning parameter as too much polymer or mixing can have a negative impact on flocculation and greatly increase operating expenses. The effects of sludge conditioning are most apparent in the gravity drainage zone which can be easily replicated on a laboratory scale where the optimum conditioning strategy can be determined. For a belt press filter to be industrially viable it must be economically efficient and thus maximum throughput is desired. Without sufficient conditioning, the gravity drainage is generally the limiting process step, but with optimum dilution the limiting process step can be shifted to the compression zone.

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text: Pym asks for three wishes: to return home, to learn the true identity of the "Beyonder", who is actually an old X-Men foe named the Stranger who wanted to study humanity, and for the Stranger to stop his experiment and never repeat it. Pym reveals that he only shrunk the group. The Stranger initially refuses to stop his experiment, but the Watcher's presence causes him to reconsider, and he leaves. Battleworld begins to break up, but Gravity temporarily holds together the world and sends the group to the teleporter, back to Earth, sacrificing his life. The entire group attends his funeral, including Mac Gargan. The Watcher states that he was there because Gravity's short career would inspire future events, and story captions state that Gravity's story is not over.

text: Pym asks for three wishes: to return home, to learn the true identity of the "Beyonder", who is actually an old

text: X-Men

text: foe named the

text: Stranger

text: who wanted to study humanity, and for the Stranger to stop his experiment and never repeat it. Pym reveals that he only shrunk the group. The Stranger initially refuses to stop his experiment, but the Watcher's presence causes him to reconsider, and he leaves. Battleworld begins to break up, but Gravity temporarily holds together the world and sends the group to the teleporter, back to Earth, sacrificing his life. The entire group attends his funeral, including Mac Gargan. The Watcher states that he was there because Gravity's short career would inspire future events, and story captions state that Gravity's story is not over.

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answers: Gravity temporarily holds together the world

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answers: Gravity

text: Zero-g is an alternative term for weightlessness and holds for instance in a freely falling lift. Zero-g is subtly different from the complete absence of gravity, something which is impossible due to the presence of gravity everywhere in the universe. "Zero-gravity" may also be used to mean effective weightlessness, neglecting tidal effects. Microgravity (or µg) is used to refer to situations that are substantially weightless but where g-force stresses within objects due to tidal effects, as discussed above, are around a millionth of that at the Earth's surface.Accelerometers can only detect g-force i.e. weight (= mass × proper acceleration). They cannot detect the acceleration associated with free fall.

text: Zero-g is an alternative term for weightlessness and holds for instance in a freely falling lift. Zero-g is subtly different from the complete absence of gravity, something which is impossible due to the presence of gravity everywhere in the universe. "Zero-gravity" may also be used to mean effective weightlessness, neglecting tidal effects. Microgravity (or µg) is used to refer to situations that are substantially weightless but where

text: g-force

text: stresses within objects due to tidal effects, as discussed above, are around a millionth of that at the Earth's surface.

text: Accelerometer

text: s can only detect

text: g-force

text: i.e. weight (= mass × proper acceleration). They cannot detect the acceleration associated with free fall.

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answers: gravity everywhere in the universe

answers: NDQ_017290

answers: Accelerometers

text: The gravity impulse generator received further theoretical support from David Maker and Glen A. Robertson, Gravi Atomic Research, Madison, Alabama and Wu.  Chris Taylor, Jupiter Research Corporation, Houston, Texas, along with a private individual Robert Hendry and the original theorist Modanese conducted an analysis of the suitability of impulse gravity generators for Earth-to-orbit, interplanetary, and interstellar applications, this was repeated again in 2008 and a United States and European patent was received.  In general, mainstream scientific community have treated the impulse gravity generator reports as extremely speculative and controversial.  At least one other group based in central Europe has attempted to replicate Podkletnov's gravity impulse generator experiment, but they have elected not to publish their results.

text: The gravity impulse generator received further theoretical support from David Maker and Glen A. Robertson, Gravi Atomic Research, Madison, Alabama and Wu.  Chris Taylor, Jupiter Research Corporation, Houston, Texas, along with a private individual Robert Hendry and the original theorist Modanese conducted an analysis of the suitability of impulse gravity generators for Earth-to-orbit, interplanetary, and interstellar applications, this was repeated again in 2008 and a United States and European patent was received.  In general, mainstream scientific community have treated the impulse gravity generator reports as extremely speculative and controversial.  At least one other group based in central Europe has attempted to replicate Podkletnov's gravity impulse generator experiment, but they have elected not to publish their results.

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answers: Gravity acts only between objects that are touching

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answers: distance

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answers: Jupiter

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answers: Gravity

answers: NDQ_017290

answers: Wu

text: Once the frequency relation is formulated in terms of ω, the angular frequency, the problem can be solved with 3 distinct solutions.  These three solutions correspond to the equatorially trapped gravity wave, the equatorially trapped Rossby wave and the mixed Rossby-gravity wave (which has some of the characteristics of the former two) .  Equatorial gravity waves can be either westward- or eastward-propagating, and correspond to n=1 (same as for the equatorially trapped Rossby wave) on a dispersion relation diagram ("w-k" diagram).  At n = 0 on a dispersion relation diagram, the mixed Rossby-gravity waves can be found where for large, positive zonal wave numbers (+k), the solution behaves like a gravity wave; but for large, negative zonal wave numbers (−k), the solution appears to be a Rossby wave (hence the term Rossby-gravity waves).  As mentioned earlier, the group velocity (or energy packet/dispersion) is always directed toward the east with a maximum for short waves (gravity waves).

text: Once the

text: frequency relation

text: is formulated in terms of ω, the angular frequency, the problem can be solved with 3 distinct solutions.  These three solutions correspond to the

text: equatorially trapped gravity wave

text: , the equatorially trapped Rossby wave and the mixed Rossby-gravity wave (which has some of the characteristics of the former two) .  Equatorial gravity waves can be either westward- or eastward-propagating, and correspond to n=1 (same as for the equatorially trapped Rossby wave) on a dispersion relation diagram ("w-k" diagram).  At n = 0 on a dispersion relation diagram, the mixed Rossby-gravity waves can be found where for large, positive zonal wave numbers (+k), the solution behaves like a gravity wave; but for large, negative zonal wave numbers (−k), the solution appears to be a Rossby wave (hence the term Rossby-gravity waves).  As mentioned earlier, the group velocity (or energy packet/dispersion) is always directed toward the east with a maximum for short waves (gravity waves).

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answers: Gravity acts only between objects that are touching

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answers: Rossby wave

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answers: Gravity

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answers: Gravity

text: An arch-gravity dam or arched dam is a dam with the characteristics of both an arch dam and a gravity dam. It is a dam that curves upstream in a narrowing curve that directs most of the water against the canyon rock walls, providing the force to compress the dam. It combines the strengths of two common dam forms and is considered a compromise between the two. They are made of conventional concrete, Roller Compacted Concrete (RCC), or masonry. Arch-gravity dams are not reinforced except at the spillway. A typical example of the conventional concrete dam is the Hoover Dam. Changuinola Dam is an example of the RCC arch-gravity dam. A gravity dam requires a large volume of internal fill. An arch-gravity dam can be thinner than the pure gravity dam and requires less internal fill.

text: An arch-gravity dam or arched dam is a

text: dam

text: with the characteristics of both an

text: arch dam

text: and a

text: gravity dam

text: . It is a dam that curves upstream in a narrowing curve that directs most of the water against the

text: canyon

text: rock walls, providing the force to

text: compress

text: the dam. It combines the strengths of two common dam forms and is considered a compromise between the two. They are made of conventional

text: concrete

text: Roller Compacted Concrete

text: (RCC), or

text: masonry

text: . Arch-gravity dams are not reinforced except at the

text: spillway

text: . A typical example of the conventional

text: concrete

text: dam is the

text: Hoover Dam

text: Changuinola Dam

text: is an example of the RCC arch-gravity dam. A gravity dam requires a large volume of internal fill. An arch-gravity dam can be thinner than the pure

text: gravity dam

text: and requires less internal fill.

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answers: Gravity acts only between objects that are touching

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answers: NDQ_017290

answers: Gravity

text: The interview is scored by identifying excerpts of speech that indicate a particular stage or sub-stage. Relevant sections are chosen from the transcript of the interview and analyzed for indications of the stage of development. The most frequent sub-stage revealed by the scoring is described as the interviewee's "centre of gravity". Stages scored at below the centre of gravity are described as "risk" (of regression) while stages scored above the centre of gravity are described as "potential" (for development). The distribution of scores is summarized by a "risk–clarity–potential" index (RCP) that can be used to characterize the nature of the developmental challenges facing a person.

text: The interview is scored by identifying excerpts of speech that indicate a particular stage or sub-stage. Relevant sections are chosen from the transcript of the interview and analyzed for indications of the stage of development. The most frequent sub-stage revealed by the scoring is described as the interviewee's "centre of gravity". Stages scored at below the centre of gravity are described as "risk" (of regression) while stages scored above the centre of gravity are described as "potential" (for development). The distribution of scores is summarized by a "risk–clarity–potential" index (RCP) that can be used to characterize the nature of the developmental challenges facing a person.

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answers: Gravity acts only between objects that are touching

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answers: Gravity

text: Gravity is most accurately described by the general theory of relativity (proposed by Albert Einstein in 1915) which describes gravity not as a force, but as a consequence of the curvature of spacetime caused by the uneven distribution of mass/energy. The most extreme example of this curvature of spacetime is a black hole, from which nothing can escape once past its event horizon, not even light. More gravity results in gravitational time dilation, where time lapses more slowly at a lower (stronger) gravitational potential. However, for most applications, gravity is well approximated by Newton's law of universal gravitation, which postulates that gravity causes a force where two bodies of mass are directly drawn (or 'attracted') to each other according to a mathematical relationship, where the attractive force is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

text: Gravity is most accurately described by the

text: general theory of relativity

text: (proposed by

text: Albert Einstein

text: in 1915) which describes gravity not as a

text: force

text: , but as a consequence of the curvature of

text: spacetime

text: caused by the uneven distribution of

text: mass

text: energy

text: . The most extreme example of this curvature of spacetime is a

text: black hole

text: , from which nothing can escape once past its event horizon, not even light. More gravity results in

text: gravitational time dilation

text: , where time lapses more slowly at a lower (stronger)

text: gravitational potential

text: . However, for most applications, gravity is well approximated by

text: Newton's law of universal gravitation

text: , which postulates that gravity causes a

text: force

text: where two bodies of mass are directly drawn (or 'attracted') to each other according to a mathematical relationship, where the attractive force is

text: directly proportional

text: to the product of their masses and

text: inversely proportional

text: to the

text: square

text: of the

text: distance

text: between them.

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answers: Newton's law of universal gravitation

text: Evidence from seismology, heat flow at the surface, and mineral physics is combined with the Earth's mass and moment of inertia to infer models of the Earth's interior – its composition, density, temperature, pressure. For example, the Earth's mean specific gravity () is far higher than the typical specific gravity of rocks at the surface (), implying that the deeper material is denser. This is also implied by its low moment of inertia (, compared to  for a sphere of constant density). However, some of the density increase is compression under the enormous pressures inside the Earth. The effect of pressure can be calculated using the Adams–Williamson equation. The conclusion is that pressure alone cannot account for the increase in density. Instead, we know that the Earth's core is composed of an alloy of iron and other minerals.

text: Evidence from

text: seismology

text: , heat flow at the surface, and

text: mineral physics

text: is combined with the Earth's mass and moment of inertia to infer models of the Earth's interior – its composition, density, temperature, pressure. For example, the Earth's mean

text: specific gravity

text: () is far higher than the typical specific gravity of rocks at the surface (), implying that the deeper material is denser. This is also implied by its low

text: moment of inertia

text: (, compared to  for a sphere of constant density). However, some of the density increase is compression under the enormous pressures inside the Earth. The effect of pressure can be calculated using the

text: Adams–Williamson equation

text: . The conclusion is that pressure alone cannot account for the increase in density. Instead, we know that the Earth's core is composed of an alloy of iron and other minerals.

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answers: It acts only between objects that are touching.

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answers: Gravity

text: 2001 accurately presents outer space as not allowing the propagation of sound, in sharp contrast to other films with space scenes in which explosions or sounds of passing spacecraft are heard. 2001 portrayal of weightlessness in spaceships and outer space is also more realistic. Tracking shots inside the rotating wheel providing artificial gravity contrast with the weightlessness outside the wheel during the repair and Hal disconnection scenes. (Scenes of the astronauts in the Discovery pod bay, along with earlier scenes involving shuttle flight attendants, depict walking in zero-gravity with the help of velcro-equipped shoes labeled "Grip Shoes"). Other aspects that contribute to the film's realism are the depiction of the time delay in conversations between the astronauts and Earth due to the extreme distance between the two (which the BBC announcer explains have been edited out of the broadcast), the attention to small details such as the sound of breathing inside the spacesuits, the conflicting spatial orientation of astronauts inside a zero-gravity spaceship, and the enormous size of Jupiter in relation to the spaceship.

text: 2001 accurately presents

text: outer space

text: as not allowing the

text: propagation of sound

text: , in sharp contrast to other films with space scenes in which explosions or sounds of passing spacecraft are heard. 2001 portrayal of

text: weightlessness

text: in spaceships and outer space is also more realistic. Tracking shots inside the rotating wheel providing

text: artificial gravity

text: contrast with the weightlessness outside the wheel during the repair and Hal disconnection scenes. (Scenes of the astronauts in the Discovery pod bay, along with earlier scenes involving shuttle flight attendants, depict walking in zero-gravity with the help of

text: velcro

text: -equipped shoes labeled "Grip Shoes"). Other aspects that contribute to the film's realism are the depiction of the time delay in conversations between the astronauts and Earth due to the extreme distance between the two (which the BBC announcer explains have been edited out of the broadcast), the attention to small details such as the sound of breathing inside the spacesuits, the conflicting spatial orientation of astronauts inside a zero-gravity spaceship, and the enormous size of Jupiter in relation to the spaceship.

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answers: NDQ_017290

answers: weightlessness outside the wheel

text: The gravity of Earth, which is denoted by , refers to the acceleration that the Earth imparts to objects on or near its surface due to gravity. In SI units this acceleration is measured in metres per second squared (in symbols, m/s or m·s) or equivalently in newtons per kilogram (N/kg or N·kg). It has an approximate value of 9.8 m/s, which means that, ignoring the effects of air resistance, the speed of an object falling freely near the Earth's surface will increase by about  per second every second, this quantity is sometimes referred to informally as little  (in contrast, the gravitational constant  is referred to as big ).

text: The gravity of Earth, which is denoted by , refers to the

text: acceleration

text: that the

text: Earth

text: imparts to objects on or near its

text: surface

text: due to

text: gravity

text: . In

text: SI units

text: this acceleration is measured in

text: metres per second squared

text: (in symbols,

text: m

text: s

text: or m·s) or equivalently in

text: newtons

text: per

text: kilogram

text: (N/kg or N·kg). It has an approximate value of 9.8 m/s, which means that, ignoring the effects of

text: air resistance

text: , the

text: speed

text: of an object

text: falling freely

text: near the Earth's surface will increase by about  per second every second, this quantity is sometimes referred to informally as little  (in contrast, the

text: gravitational constant

text: is referred to as big ).

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answers: Gravity acts only between objects that are touching

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answers: The gravity of Earth

answers: NDQ_017290

answers: kilogram

text: The fact that many large celestial objects are approximately spheres makes it easier to calculate their surface gravity. The gravitational force outside a spherically symmetric body is the same as if its entire mass were concentrated in the center, as was established by Sir Isaac Newton. Therefore, the surface gravity of a planet or star with a given mass will be approximately inversely proportional to the square of its radius, and the surface gravity of a planet or star with a given average density will be approximately  proportional to its radius. For example, the recently discovered planet, Gliese 581 c, has at least 5 times the mass of Earth, but is unlikely to have 5 times its surface gravity. If its mass is no more than 5 times that of the Earth, as is expected, and if it is a rocky planet with a large iron core, it should have a radius approximately 50% larger than that of Earth. Gravity on such a planet's surface would be approximately 2.2 times as strong as on Earth. If it is an icy or watery planet, its radius might be as large as twice the Earth's, in which case its surface gravity might be no more than 1.25 times as strong as the Earth's.

text: The fact that many large celestial objects are approximately spheres makes it easier to calculate their surface gravity. The gravitational force outside a spherically symmetric body is the same as if its entire mass were concentrated in the center, as was established by

text: Sir Isaac Newton

text: . Therefore, the surface gravity of a

text: planet

text: or

text: star

text: with a given mass will be approximately inversely proportional to the square of its

text: radius

text: , and the surface gravity of a planet or star with a given average density will be approximately  proportional to its radius. For example, the recently discovered

text: planet

text: Gliese 581 c

text: , has at least 5 times the mass of Earth, but is unlikely to have 5 times its surface gravity. If its mass is no more than 5 times that of the Earth, as is expected, and if it is a rocky planet with a large iron core, it should have a radius approximately 50% larger than that of Earth. Gravity on such a planet's surface would be approximately 2.2 times as strong as on Earth. If it is an icy or watery planet, its radius might be as large as twice the Earth's, in which case its surface gravity might be no more than 1.25 times as strong as the Earth's.

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answers: Gravity acts only between objects that are touching

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answers: mass

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answers: Gliese 581 c

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answers: Gravity

answers: NDQ_017290

answers: Gravity

text: Gravity, or gravitation, is a natural phenomenon by which all things with mass are brought toward (or gravitate toward) one another, including planets, stars and galaxies. Since energy and mass are equivalent, all forms of energy, including light, also cause gravitation and are under the influence of it. On Earth, gravity gives weight to physical objects and causes the ocean tides.  The gravitational attraction of the original gaseous matter present in the Universe caused it to begin coalescing, forming stars — and the stars to group together into galaxies — so gravity is responsible for many of the large scale structures in the Universe.  Gravity has an infinite range, although its effects become increasingly weaker on farther objects.

text: Gravity, or gravitation, is a

text: natural phenomenon

text: by which all things with

text: mass

text: are brought toward (or gravitate toward) one another, including

text: planet

text: s,

text: star

text: s and

text: galaxies

text: . Since

text: energy and mass are equivalent

text: , all forms of

text: energy

text: , including

text: light

text: , also cause gravitation and are under the influence of it. On

text: Earth

text: , gravity gives

text: weight

text: to physical objects and causes the ocean

text: tides

text: .  The gravitational attraction of the original gaseous matter present in the

text: Universe

text: caused it to begin coalescing, forming

text: star

text: s — and the stars to group together into

text: galaxies

text: — so gravity is responsible for many of the large scale structures in the Universe.  Gravity has an infinite range, although its effects become increasingly weaker on farther objects.

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answers: Gravity has an infinite range

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answers: mass

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answers: stars

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answers: all things with mass are brought toward (or gravitate toward) one another

answers: NDQ_017290

answers: Gravity

text: The force of gravity on Earth is the resultant (vector sum) of two forces:  (a) The gravitational attraction in accordance with Newton's universal law of gravitation, and (b) the centrifugal force, which results from the choice of an earthbound, rotating frame of reference.  The force of gravity is the weakest at the equator because of the centrifugal force caused by the Earth's rotation and because points on the equator are furthest from the center of the Earth.  The force of gravity varies with latitude and increases from about 9.780 m/s at the Equator to about 9.832 m/s at the poles.

text: The force of gravity on Earth is the resultant (vector sum) of two forces:  (a) The gravitational attraction in accordance with Newton's universal law of gravitation, and (b) the centrifugal force, which results from the choice of an earthbound, rotating frame of reference.  The force of gravity is the weakest at the equator because of the centrifugal force caused by the Earth's rotation and because points on the equator are furthest from the center of the Earth.  The force of gravity varies with latitude and increases from about 9.780 m/s at the Equator to about 9.832 m/s at the poles.

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answers: It acts only between objects that are touching.

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answers: Newton's universal law of gravitation

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answers: Gravity

text: What this means is that in a spacetime with non-vanishing curvature, gravity is modified from Newtonian gravity. At distances comparable to the radius of the space, objects feel an additional linear repulsion from the center of coordinates.

text: What this means is that in a spacetime with non-vanishing curvature, gravity is modified from Newtonian gravity. At distances comparable to the radius of the space, objects feel an additional linear repulsion from the center of coordinates.

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answers: Newtonian gravity

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answers: Newtonian

text: Specific gravity is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. Apparent specific gravity is the ratio of the weight of a volume of the substance to the weight of an equal volume of the reference substance. The reference substance is nearly always water at its densest (4°C) for liquids; for gases it is air at room temperature (21°C). Nonetheless, the temperature and pressure must be specified for both the sample and the reference. Pressure is nearly always 1 atm (101.325 kPa).  Temperatures for both sample and reference vary from industry to industry. In British beer brewing, the practice for specific gravity as specified above is to multiply it by 1000. Specific gravity is commonly used in industry as a simple means of obtaining information about the concentration of solutions of various materials such as brines, hydrocarbons, sugar solutions (syrups, juices, honeys, brewers wort, must etc.) and acids.

text: Specific gravity is the ratio of the

text: density

text: of a substance to the density of a reference substance; equivalently, it is the ratio of the

text: mass

text: of a substance to the mass of a reference substance for the same given volume. Apparent specific gravity is the ratio of the weight of a volume of the substance to the weight of an equal volume of the reference substance. The reference substance is nearly always

text: water

text: at its densest (4°C) for liquids; for gases it is air at room temperature (21°C). Nonetheless, the temperature and pressure must be specified for both the sample and the reference. Pressure is nearly always 1

text: atm

text: (101.325 kPa).  Temperatures for both sample and reference vary from industry to industry. In British beer brewing, the practice for specific gravity as specified above is to multiply it by 1000. Specific gravity is commonly used in industry as a simple means of obtaining information about the concentration of solutions of various materials such as brines, hydrocarbons, sugar solutions (syrups, juices, honeys, brewers

text: wort

text: must

text: etc.) and acids.

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answers: The reference substance is nearly always water

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answers: The reference substance

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answers: Specific gravity

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answers: weight

text: There are stringent constraints on energy-dependent speed-of-light scenarios. Based on these, Sabine Hossenfelder has strongly criticised the rainbow gravity concept, stating that "It is neither a theory nor a model, it is just an idea that, despite more than a decade of work, never developed into a proper model. Rainbow gravity has not been shown to be compatible with the standard model. There is no known quantization of this approach and one cannot describe interactions in this framework at all. Moreover, it is known to lead to non-localities which are ruled out already. For what I am concerned, no papers should get published on the topic until these issues have been resolved."

text: There are stringent constraints on energy-dependent speed-of-light scenarios. Based on these, Sabine Hossenfelder has strongly criticised the rainbow gravity concept, stating that "It is neither a theory nor a model, it is just an idea that, despite more than a decade of work, never developed into a proper model. Rainbow gravity has not been shown to be compatible with the standard model. There is no known quantization of this approach and one cannot describe interactions in this framework at all. Moreover, it is known to lead to non-localities which are ruled out already. For what I am concerned, no papers should get published on the topic until these issues have been resolved."

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answers: One cannot describe interactions in this framework at all

answers: NDQ_017283

answers: energy

answers: NDQ_017284

answers: rainbow

answers: NDQ_017286

answers: Rainbow gravity

answers: NDQ_017290

answers: Hossenfelder

text: A gravity knife is a knife with a blade contained in its handle, and which opens its blade by the force of inertia or gravity.  As the gravity knife requires gravity or spinning motion to propel the blade out of the handle, it differs fundamentally from the switchblade, which opens its spring-propelled blade automatically upon the push of a button, switch, or fulcrum lever. The main purpose of this opening method is that it allows opening and closing to be done one handed, in situations where the other hand is occupied. A major historical use has been in issue to parachutists to cut off their parachutes when tangled in a tree or in similar situations.

text: A gravity knife is a

text: knife

text: with a blade contained in its handle, and which opens its blade by the force of inertia or

text: gravity

text: .  As the gravity knife requires gravity or spinning motion to propel the blade out of the handle, it differs fundamentally from the

text: switchblade

text: , which opens its spring-propelled blade automatically upon the push of a button, switch, or fulcrum lever. The main purpose of this opening method is that it allows opening and closing to be done one handed, in situations where the other hand is occupied. A major historical use has been in issue to parachutists to cut off their parachutes when tangled in a tree or in similar situations.

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answers: Gravity acts only between objects that are touching

answers: NDQ_017283

answers: distance

answers: NDQ_017284

answers: A gravity knife

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Gravity

text: In the operational definition, the weight of an object is the force measured by the operation of weighing it, which is the force it exerts on its support. Since, W=downward force on the body by the centre of earth, and there is no acceleration in the body. So, there exists opposite and equal force by the support on the body. Also it is equal to the force exerted by the body on its support because action and reaction have same numerical value and opposite direction.This can make a considerable difference, depending on the details; for example, an object in free fall exerts little if any force on its support, a situation that is commonly referred to as weightlessness. However, being in free fall does not affect the weight according to the gravitational definition. Therefore, the operational definition is sometimes refined by requiring that the object be at rest. However, this raises the issue of defining "at rest" (usually being at rest with respect to the Earth is implied by using standard gravity). In the operational definition, the weight of an object at rest on the surface of the Earth is lessened by the effect of the centrifugal force from the Earth's rotation.

text: In the operational definition, the weight of an object is the

text: force

text: measured by the operation of weighing it, which is the force it exerts on its support. Since, W=downward force on the body by the centre of earth, and there is no acceleration in the body. So, there exists opposite and equal force by the support on the body. Also it is equal to the force exerted by the body on its support because action and reaction have same numerical value and opposite direction.This can make a considerable difference, depending on the details; for example, an object in

text: free fall

text: exerts little if any force on its support, a situation that is commonly referred to as

text: weightlessness

text: . However, being in free fall does not affect the weight according to the gravitational definition. Therefore, the operational definition is sometimes refined by requiring that the object be at rest. However, this raises the issue of defining "at rest" (usually being at rest with respect to the Earth is implied by using

text: standard gravity

text: ). In the operational definition, the weight of an object at rest on the surface of the Earth is lessened by the effect of the centrifugal force from the Earth's rotation.

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answers: An object in free fall exerts little if any force on its support, a situation that is commonly referred to as weightlessness

answers: NDQ_017283

answers: weight

answers: NDQ_017284

answers: centre of earth

answers: NDQ_017286

answers: Earth's rotation

answers: NDQ_017290

answers: the operation of weighing it

text: Mongo's surface gravity appears to be a bit less than that of Earth, or at least there are comments on occasion that Terrans are stronger on Mongo than they are on Earth. The difference in surface gravity can not be too great, because Mongo is so Earth-like, and Terrans on Mongo are by no means superhuman.

text: Mongo's surface gravity appears to be a bit less than that of Earth, or at least there are comments on occasion that Terrans are stronger on Mongo than they are on Earth. The difference in surface gravity can not be too great, because Mongo is so Earth-like, and Terrans on Mongo are by no means superhuman.

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answers: It acts only between objects that are touching

answers: NDQ_017283

answers: surface

answers: NDQ_017284

answers: Earth

answers: NDQ_017286

answers: Gravity

answers: NDQ_017290

answers: Earth

text: Helium II also exhibits a creeping effect. When a surface extends past the level of helium II, the helium II moves along the surface, against the force of gravity. Helium II will escape from a vessel that is not sealed by creeping along the sides until it reaches a warmer region where it evaporates. It moves in a 30 nm-thick film regardless of surface material. This film is called a Rollin film and is named after the man who first characterized this trait, Bernard V. Rollin. As a result of this creeping behavior and helium II's ability to leak rapidly through tiny openings, it is very difficult to confine liquid helium. Unless the container is carefully constructed, the helium II will creep along the surfaces and through valves until it reaches somewhere warmer, where it will evaporate. Waves propagating across a Rollin film are governed by the same equation as gravity waves in shallow water, but rather than gravity, the restoring force is the van der Waals force. These waves are known as third sound.

text: Helium II also exhibits a creeping effect. When a surface extends past the level of helium II, the helium II moves along the surface, against the force of

text: gravity

text: . Helium II will escape from a vessel that is not sealed by creeping along the sides until it reaches a warmer region where it evaporates. It moves in a 30

text: nm

text: -thick film regardless of surface material. This film is called a

text: Rollin film

text: and is named after the man who first characterized this trait,

text: Bernard V. Rollin

text: . As a result of this creeping behavior and helium II's ability to leak rapidly through tiny openings, it is very difficult to confine liquid helium. Unless the container is carefully constructed, the helium II will creep along the surfaces and through valves until it reaches somewhere warmer, where it will evaporate. Waves propagating across a Rollin film are governed by the same equation as

text: gravity wave

text: s in shallow water, but rather than gravity, the restoring force is the

text: van der Waals force

text: . These waves are known as

text: third sound

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text: Because gravity varies by over 0.5% over the surface of the earth, the distinction between force due to gravity and mass is relevant for accurate calibration of scales for commercial purposes. Usually the goal is to measure the mass of the sample rather than its force due to gravity at that particular location.

text: Because gravity varies by over 0.5% over the surface of the earth, the

text: distinction between force due to gravity and mass

text: is relevant for accurate calibration of scales for commercial purposes. Usually the goal is to measure the

text: mass

text: of the sample rather than its force due to gravity at that particular location.

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text: Larry Niven's novel Ringworld featured a gigantic habitat encircling a star, which created artificial gravity through rotation.  Niven also makes a reference to the Coriolis effect when the protagonists see what looks like a giant eye above the horizon.  When they get closer, they realise that it is in fact a hurricane, but rotating about an axis parallel to the ground rather than perpendicular to it.  Large hurricanes on Earth rotate the way they do due to the Coriolis effect. A number of early Known Space and Man-Kzin Wars stories also make use of rotational gravity, prior to the adoption of "gravity polarizer" technology which generates artificial gravity fields.

text: Larry Niven

text: 's novel

text: Ringworld

text: featured a gigantic habitat encircling a star, which created artificial gravity through rotation.  Niven also makes a reference to the

text: Coriolis effect

text: when the protagonists see what looks like a giant eye above the horizon.  When they get closer, they realise that it is in fact a hurricane, but rotating about an axis parallel to the ground rather than perpendicular to it.  Large hurricanes on Earth rotate the way they do due to the Coriolis effect. A number of early

text: Known Space

text: and

text: Man-Kzin Wars

text: stories also make use of rotational gravity, prior to the adoption of "gravity polarizer" technology which generates artificial gravity fields.

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answers: Gravity

text: Aether has been used in various gravitational theories as a medium to help explain gravitation and what causes it. It was used in one of Sir Isaac Newton's first published theories of gravitation, Philosophiæ Naturalis Principia Mathematica (the Principia). He based the whole description of planetary motions on a theoretical law of dynamic interactions. He renounced standing attempts at accounting for this particular form of interaction between distant bodies by introducing a mechanism of propagation through an intervening medium. He calls this intervening medium aether. In his aether model, Newton describes aether as a medium that "flows" continually downward toward the Earth's surface and is partially absorbed and partially diffused. This "circulation" of aether is what he associated the force of gravity with to help explain the action of gravity in a non-mechanical fashion. This theory described different aether densities, creating an aether density gradient. His theory also explains that aether was dense within objects and rare without them. As particles of denser aether interacted with the rare aether they were attracted back to the dense aether much like cooling vapors of water are attracted back to each other to form water. In the Principia he attempts to explain the elasticity and movement of aether by relating aether to his static model of fluids. This elastic interaction is what caused the pull of gravity to take place, according to this early theory, and allowed an explanation for action at a distance instead of action through direct contact. Newton also explained this changing rarity and density of aether in his letter to Robert Boyle in 1679. He illustrated aether and its field around objects in this letter as well and used this as a way to inform Robert Boyle about his theory. Although Newton eventually changed his theory of gravitation to one involving force and the laws of motion, his starting point for the modern understanding and explanation of gravity came from his original aether model on gravitation.

text: Aether has been used in various gravitational theories as a medium to help explain gravitation and what causes it. It was used in one of Sir

text: Isaac Newton

text: 's first published theories of gravitation,

entity_name: Philosophiæ Naturalis Principia Mathematica

text: Philosophiæ Naturalis Principia Mathematica

text: Robert Boyle

text: in 1679. He illustrated aether and its field around objects in this letter as well and used this as a way to inform Robert Boyle about his theory. Although Newton eventually changed his theory of gravitation to one involving force and the laws of motion, his starting point for the modern understanding and explanation of gravity came from his original aether model on gravitation.

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answers: 0: The answer is not relevant or complete at all.

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answers: This elastic interaction is what caused the pull of gravity to take place

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answers: This elastic interaction is what caused the pull of gravity to take place

answers: NDQ_017290

answers: Newton eventually changed his theory of gravitation to one involving force

text: Orbitals spin to mimic the effects of gravity and are sized so that the rate of rotation necessary to produce a comfortable gravity level is approximately equal to one day. In the case of the standard Culture day and gravity, this diameter is around three million kilometres. For such an orbital to reproduce the equivalent to the Earth's gravity (9.8 m/s at sea level), whilst maintaining Earth's 24-hour period of rotation, it would need to have a diameter of approximately 3.71 million kilometres, and spinning at 486,000 km/hr. By tilting the axis of the Orbital relative to its orbit around a star a convenient day-night cycle can be experienced by the inhabitants. Since the edges of the Orbital are built as high walls, the rotation prevents the atmosphere from escaping, thus protecting the inhabitants from radiation. The walls are typically hundreds or thousands of kilometres high, made of a 'monocrystal' material.

text: Orbitals

text: spin to mimic the effects

text: of

text: gravity

text: and are sized so that the rate of

text: rotation

text: necessary to produce a comfortable gravity level is approximately equal to one

text: day

text: . In the case of the standard Culture day and gravity, this

text: diameter

text: is around three million kilometres. For such an orbital to reproduce the equivalent to the Earth's gravity (9.8 m/s at sea level), whilst maintaining Earth's 24-hour period of rotation, it would need to have a diameter of approximately 3.71 million kilometres, and spinning at 486,000 km/hr. By tilting the

text: axis

text: of the Orbital relative to its

text: orbit

text: around a

text: star

text: a convenient day-night cycle can be experienced by the inhabitants. Since the edges of the Orbital are built as high walls, the rotation prevents the atmosphere from escaping, thus protecting the inhabitants from

text: radiation

text: . The walls are typically hundreds or thousands of kilometres high, made of a 'monocrystal' material.

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text: Textile exhibits show visitors how the pioneers dressed and “modern conveniences” such as the ice box and the wringer washer reveal how early residents lived and worked. Items on display range in size from the very large (such as the telephone switchboard from a hotel) to the much smaller (such as the collection of cameras and medical instruments). Display cases maintained by local Finns, Poles and Lithuanians are highlights of the heritage exhibits.

text: Textile

text: exhibits show visitors how the

text: pioneers

text: dressed

text: and “modern conveniences” such as the

text: ice box

text: and the wringer washer reveal how early residents lived and worked. Items on display range in size from the very large (such as the

text: telephone switchboard

text: from a hotel) to the much smaller (such as the collection of cameras and medical instruments). Display cases maintained by local

text: Finns

text: Poles

text: and

text: Lithuanians

text: are highlights of the heritage exhibits.

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answers: Items on display

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answers: Items on display

text: The content of the KSFO's talk programming is conservative, with show hosts such as Mark Levin and Michael Savage. The station also airs Red Eye Radio overnights.

text: The content of the KSFO's talk programming is conservative, with show hosts such as

text: Mark Levin

text: and

text: Michael Savage

text: . The station also airs

text: Red Eye Radio

text: overnights.

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text: Conversely, the two most problematic areas were personal thermal comfort and conversational privacy. Despite overwhelming use of the windows (which they admitted helped keep the air fresh) and location-specific thermal controls, almost half rated their ability to reach their personally desired level as "less than adequate." Manasc Isaac noted that the building operator was attempting to address that.

text: Conversely, the two most problematic areas were personal thermal comfort and conversational privacy. Despite overwhelming use of the windows (which they admitted helped keep the air fresh) and location-specific thermal controls, almost half rated their ability to reach their personally desired level as "less than adequate." Manasc Isaac noted that the building operator was attempting to address that.

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text: The weak gravity conjecture (WGC) is a conjecture regarding the strength gravity can have in a theory of quantum gravity relative to the gauge forces in that theory. It roughly states that gravity should be the weakest force in any consistent theory of quantum gravity.

text: The weak gravity conjecture (WGC) is a conjecture regarding the strength

text: gravity

text: can have in a theory of

text: quantum gravity

text: relative to the gauge forces in that theory. It roughly states that gravity should be the weakest force in any consistent theory of quantum gravity.

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text: Longtime columnist Emory King died in August 2007. King's column officially ceased with the 19 August 2007 issue of the Times.

text: Longtime columnist Emory King died in August 2007. King's column officially ceased with the 19 August 2007 issue of the Times.

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text: The Border

text: The Border

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answers: balance is used to measure weight.

text: After the Second Vatican Council Paul VI contributed in two ways to the continued growth of ecumenism and inter-Christian dialogue. The separated brothers and sisters, as he called them, were not able to contribute to the Council as invited observers. After the Council, many of them took initiative to seek out their Catholic counterparts and the Pope in Rome, who welcomed such visits.

text: After the

text: Second Vatican Council

text: Paul VI contributed in two ways to the continued growth of ecumenism and inter-Christian dialogue. The separated brothers and sisters, as he called them, were not able to contribute to the Council as invited observers. After the Council, many of them took initiative to seek out their Catholic counterparts and the Pope in Rome, who welcomed such visits.

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text: Despite the criticisms, Quizmania became the first live and interactive quizshow to broadcast on analogue terrestrial television.

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text: terrestrial television

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text: The type-host and only recorded host of Pseudorhabdosynochus vascellum is the Scamp, Mycteroperca phenax (Serranidae: Epinephelinae). The type-locality, and only known locality, is Pinnacles Reef System, off Mississippi Sound, South of Pascagoula, Mississippi, Mississippi.

text: The type-host and only recorded host of Pseudorhabdosynochus vascellum is the Scamp,

text: Mycteroperca phenax

text: (Serranidae: Epinephelinae). The type-locality, and only known locality, is Pinnacles Reef System, off

text: Mississippi Sound

text: , South of

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text: Mississippi

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answers: Recorded

text: Friends Provident Trophy (50 overs)

text: Friends Provident Trophy (50 overs)

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text: |-| rowspan="2"| 2012| February 28| rowspan="2"| "Touch"|-| March 6|}

text: |-| rowspan="2"| 2012| February 28| rowspan="2"| "Touch"|-| March 6|}

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text: On August 8, 2006, Evernham Motorsports announced that Elliott would return to the organization for the race at Watkins Glen driving the No. 19 Dodge previously driven by Jeremy Mayfield. The team fell out of the top-35 in owners' points after Indianapolis, leading to the firing of Mayfield, and Evernham assumed that Elliott would guarantee a starting spot in the field by being a past champion. However, since the driver switch was made past the entry deadline, NASCAR said that Elliott was not eligible for the past champions provisional.

text: On August 8, 2006, Evernham Motorsports announced that Elliott would return to the organization for

text: the race

text: at

text: Watkins Glen

text: driving the No. 19 Dodge previously driven by

text: Jeremy Mayfield

text: . The team fell out of the

text: top-35 in owners' points

text: after Indianapolis, leading to the firing of Mayfield, and Evernham assumed that Elliott would guarantee a starting spot in the field by being a past champion. However, since the driver switch was made past the entry deadline, NASCAR said that Elliott was not eligible for the past champions provisional.

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text: The native protagonist, Barlennan, captain of the Bree, is on a trading expedition to the equator, where the gravity is a tiny fraction of what his culture is used to. Prior to the story's opening, a human scientific probe has become stranded at one of the planet's poles, and team member Charles Lackland is dispatched to the equator where he has met Barlennan by chance. Lackland is barely able to survive (machine-aided) what to the captain is the incredibly light gravity, but has managed to teach the Mesklinites English, and enlist the Bree to journey to the pole and recover the probe, in return for information about the violent weather which often plagues such expeditions. Communication is achieved through an audio-visual radio built to function in a high-gravity environment, which is treated as magical by other intelligences encountered on the planet.

text: The native protagonist, Barlennan, captain of the Bree, is on a trading expedition to the equator, where the gravity is a tiny fraction of what his culture is used to. Prior to the story's opening, a human scientific probe has become stranded at one of the planet's poles, and team member Charles Lackland is dispatched to the equator where he has met Barlennan by chance. Lackland is barely able to survive (machine-aided) what to the captain is the incredibly light gravity, but has managed to teach the Mesklinites English, and enlist the Bree to journey to the pole and recover the probe, in return for information about the violent weather which often plagues such expeditions. Communication is achieved through an audio-visual radio built to function in a high-gravity environment, which is treated as magical by other intelligences encountered on the planet.

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text: Mal Waldron with the Steve Lacy Quintet is an album by American jazz pianist Mal Waldron and soprano saxophonist Steve Lacy released on the French America label in 1972. The original LP release featured three tracks and the 2005 CD reissue added two alternate takes.

text: Mal Waldron with the Steve Lacy Quintet is an album by American jazz pianist

text: Mal Waldron

text: and soprano saxophonist

text: Steve Lacy

text: released on the French

text: America

text: label in 1972. The original LP release featured three tracks and the 2005 CD reissue added two alternate takes.

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text: Mesaieed was established in 1949 as a tanker terminal by Qatar Petroleum on a previously uninhabited site along the coast. It was chosen by the company because of its proximity to the working population in Doha and Al Wakrah and because of the depth of its waters. It was the only deepwater port in Qatar for more than 20 years. The first industrial facilities prepared on site were oil pumps and oil storage tanks.

text: Mesaieed was established in 1949 as a tanker terminal by

text: Qatar Petroleum

text: on a previously uninhabited site along the coast. It was chosen by the company because of its proximity to the working population in Doha and Al Wakrah and because of the depth of its waters. It was the only deepwater port in Qatar for more than 20 years. The first industrial facilities prepared on site were oil pumps and oil storage tanks.

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text: Trapped () is an Icelandic mystery television series created by Baltasar Kormákur and produced by RVK Studios.

text: Trapped () is an

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text: SLICP Online is the online system that allows Western Australian government agencies to submit requests online. It can be found at https://slicp-online.landgate.wa.gov.au/. The application was built by Satellite Remote Sensing Services (SRSS) on iDelve infrastructure for the WALIS Community using funding provided by Landgate.

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text: Howard Nusbaum has one daughter (Rebecca), and he is married to Anne Henly, the Director of the undergraduate research initiative in psychology at the University of Chicago social science collegiate division. They live in Hyde Park, Chicago with their two Newfoundland boys, Newton and Otto.

text: Howard Nusbaum has one daughter (Rebecca), and he is married to Anne Henly, the Director of the undergraduate research initiative in psychology at the University of Chicago social science collegiate division. They live in

text: Hyde Park, Chicago

text: with their two Newfoundland boys, Newton and Otto.

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text: Kepler, using Galileo's discoveries, showed knowledge of the equivalence principle by accurately describing what would occur if the moon were stopped in its orbit and dropped towards Earth. This can be deduced without knowing if or in what manner gravity decreases with distance, but requires assuming the equivalency between gravity and inertia.

text: Kepler, using Galileo's discoveries, showed knowledge of the equivalence principle by accurately describing what would occur if the moon were stopped in its orbit and dropped towards Earth. This can be deduced without knowing if or in what manner gravity decreases with distance, but requires assuming the equivalency between gravity and inertia.

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text: The hierarchy—complete/direct/indirect—is in decreasing order of

text: The hierarchy—complete/direct/indirect—is in decreasing order of

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answers: complete

text: In the 2014–15 season, Saxena hit three centuries and amassed 768 runs at an average of 45.17. In a match against Tamil Nadu, he scored 144 and then took 4/74 and 3/109 to win the man of the match. He was part of the Central Zone team that won the 2014–15 Duleep Trophy in which he scored 110 in the semifinal against North Zone and 71 in the final against South Zone, and also picked wickets.

text: In the 2014–15 season, Saxena hit three centuries and amassed 768 runs at an average of 45.17. In a match against Tamil Nadu, he scored 144 and then took 4/74 and 3/109 to win the man of the match. He was part of the Central Zone team that won the

text: 2014–15 Duleep Trophy

text: in which he scored 110 in the semifinal against North Zone and 71 in the final against South Zone, and also picked wickets.

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text: With the loss, Dallas fell to 3–8.

text: With the loss, Dallas fell to 3–8.

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answers: 3-8

text: Strength of the Sword 3 (re-released as Strength of the Sword Ultimate) is a third-person, fast paced, challenge driven, action beat 'em up video game set in a fantasy realm. The game is produced by the small indie game studio Ivent Games for PlayStation 3 and later in 2016 for Microsoft Windows, Linux, PlayStation 4, PlayStation Vita and Wii U. The story focuses around Strahil, the former leader of the "Upper Kingdom" and the victim of a cruel plot that led to his imprisonment in a dark cave. As Strahil, you will have to advance through four different locations set on the "Island of Dreams" and seek vengeance from the evil figures behind the plot that led to his imprisonment. Throughout his way Strahil will have to deal with brutal enemies who would prefer to die rather than surrender.

text: Strength of the Sword 3 (re-released as Strength of the Sword Ultimate) is a third-person, fast paced, challenge driven, action beat 'em up video game set in a fantasy realm. The game is produced by the small indie game studio Ivent Games for

text: PlayStation 3

text: and later in 2016 for

text: Microsoft Windows

text: Linux

text: PlayStation 4

text: PlayStation Vita

text: and

text: Wii U

text: . The story focuses around Strahil, the former leader of the "Upper Kingdom" and the victim of a cruel plot that led to his imprisonment in a dark cave. As Strahil, you will have to advance through four different locations set on the "Island of Dreams" and seek vengeance from the evil figures behind the plot that led to his imprisonment. Throughout his way Strahil will have to deal with brutal enemies who would prefer to die rather than surrender.

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answers: Strahil

text: The Pedernales Municipality is one of the four municipalities (municipios) that makes up the eastern Venezuelan state of Delta Amacuro and, according to a 2007 population estimate by the National Institute of Statistics of Venezuela, the municipality has a population of 6,535.  The town of Pedernales is the shire town of the Pedernales Municipality.

text: The Pedernales Municipality is one of the four

text: municipalities

text: municipio

text: s) that makes up the eastern

text: Venezuela

text: n state of

text: Delta Amacuro

text: and, according to a 2007 population estimate by the National Institute of Statistics of Venezuela, the municipality has a population of 6,535.  The town of

text: Pedernales

text: is the

text: shire town

text: of the Pedernales Municipality.

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answers: Gravity

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answers: Population estimate by the National Institute of Statistics of Venezuela

text: Often when engineers analyze a system to be controlled or optimized, they use a mathematical model. In analysis, engineers can build a descriptive model of the system as a hypothesis of how the system could work, or try to estimate how an unforeseeable event could affect the system. Similarly, in control of a system, engineers can try out different control approaches in simulations.

text: Often when engineers analyze a system to be controlled or optimized, they use a mathematical model. In analysis, engineers can build a descriptive model of the system as a hypothesis of how the system could work, or try to estimate how an unforeseeable event could affect the system. Similarly, in control of a system, engineers can try out different control approaches in

text: simulation

text: s.

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answers: balance

text: Originally likely designed as the industrial controller, the computer initially had a keyboard completely orthogonally laid out rectangular key caps. This was possibly done as a result of using standard CNC keyboard components that need to minimize the entry of environtmental dirt into the system. Later designs (model "8A") used standard keyboard arrangement and were available in a number of schools as educational computers.

text: Originally likely designed as the industrial controller, the computer initially had a keyboard completely orthogonally laid out rectangular key caps. This was possibly done as a result of using standard CNC keyboard components that need to minimize the entry of environtmental dirt into the system. Later designs (model "8A") used standard keyboard arrangement and were available in a number of schools as

text: education

text: al computers.

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answers: It acts only between objects that are touching

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answers: 8A

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answers: Yes

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answers: The industrial controller

text: XEHL received its concession on June 17, 1941 and signed on the next year. It was owned by Radio Anunciadora Kist, S. de R.L. and operated on 1370 kHz, later moving to 1010. XEHL was affiliated to Radio Programas de México until 1949, when owner Alejandro Díaz Guerra broke ties with RPM.

text: XEHL received its concession on June 17, 1941 and signed on the next year. It was owned by Radio Anunciadora Kist, S. de R.L. and operated on 1370 kHz, later moving to 1010. XEHL was affiliated to

text: Radio Programas de México

text: until 1949, when owner Alejandro Díaz Guerra broke ties with RPM.

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answers: 1010

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answers: XEHL

text: Red Inferno: 1945 is a 2010 novel written by Robert Conroy, the author of other alternate history novels.

text: Red Inferno: 1945 is a 2010 novel written by

text: Robert Conroy

text: , the author of other

text: alternate history

text: novels.

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answers: weight

text: The Collection des chroniques nationales françaises writes:

text: The Collection des chroniques nationales françaises writes:

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answers: 1: The answer is not relevant or complete at all.

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answers: Gravity acts only between objects that are touching

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answers: the Moon

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answers: a balance

text: In 1915 units that had nicknames or names of honour lost them by order of the War Ministry. Thereafter units were designated only by number. For instance, the k.u.k. Infanterie-Regiment (Hoch und Deutschmeister) Nr. 4 became Infanterie-Regiment No. 4 (4th Infantry Regiment).

text: In 1915 units that had nicknames or names of honour lost them by order of the War Ministry. Thereafter units were designated only by number. For instance, the k.u.k. Infanterie-Regiment (Hoch und Deutschmeister) Nr. 4 became Infanterie-Regiment No. 4 (4th Infantry Regiment).

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answers: It is impossible to tell

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answers: 4th Infantry Regiment

answers: NDQ_017286

answers: Yes

answers: NDQ_017290

answers: Infanterie-Regiment

text: 2011 - 2012: Division D

text: 2011 - 2012: Division D

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answers: Gravity acts between objects that are touching

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answers: distance

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answers: D

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answers: gravitational attraction

answers: NDQ_017290

answers: Division D

text: The median age in the city was 31.5 years. 28.5% of residents were under the age of 18; 10.6% were between the ages of 18 and 24; 27.3% were from 25 to 44; 21.5% were from 45 to 64; and 12% were 65 years of age or older. The gender makeup of the city was 47.7% male and 52.3% female.

text: The median age in the city was 31.5 years. 28.5% of residents were under the age of 18; 10.6% were between the ages of 18 and 24; 27.3% were from 25 to 44; 21.5% were from 45 to 64; and 12% were 65 years of age or older. The gender makeup of the city was 47.7% male and 52.3% female.

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answers: It's impossible to say

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answers: age

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answers: 45 to 64

answers: NDQ_017286

answers: 12% were 65 years of age

answers: NDQ_017290

answers: median age

text: In the absence of other forces, gravity results in a constant downward acceleration of every freely moving object. Near Earth's surface the acceleration due to gravity is  and the gravitational force on an object of mass m is . It is convenient to imagine this gravitational force concentrated at the center of mass of the object.

text: In the absence of other forces, gravity results in a constant downward acceleration of every freely moving object. Near Earth's surface the acceleration due to gravity is  and the gravitational force on an object of mass m is . It is convenient to imagine this gravitational force concentrated at the center of mass of the object.

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answers: In the absence of other forces

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answers: mass

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answers: Gravity

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answers: mass

text: Earth's gravity allows it to hold an atmosphere. Water vapor and carbon dioxide in the atmosphere provide a temperature buffer (greenhouse effect) which helps maintain a relatively steady surface temperature. If Earth were smaller, a thinner atmosphere would allow temperature extremes, thus preventing the accumulation of water except in polar ice caps (as on Mars).

text: Earth's

text: gravity

text: allows it to hold an

text: atmosphere

text: . Water vapor and carbon dioxide in the atmosphere provide a temperature buffer (

text: greenhouse effect

text: ) which helps maintain a relatively steady surface temperature. If Earth were smaller, a thinner atmosphere would allow temperature extremes, thus preventing the accumulation of water except in

text: polar ice cap

text: s (as on

text: Mars

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text: , the Lie derivative reduces to the standard directional derivative:

text: , the Lie derivative reduces to the standard directional derivative:

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text: is the position operator on

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text: is related to the so-called spin connection via

text: is related to the so-called

text: spin connection

text: via

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text: The apparent weight can also differ from weight when an object is "partially or completely immersed in a fluid", where there is an "upthrust" from the liquid that is working against the force of gravity. Another example is the weight of an object or person riding in an elevator. When the elevator begins rising, the object begins exerting a force in the downward direction. If a scale was used, it would be seen that the weight of the object is becoming heavier because of the downward force, changing the apparent weight.

text: The apparent weight can also differ from weight when an object is "partially or completely immersed in a fluid", where there is an "upthrust" from the liquid that is working against the

text: force of gravity

text: . Another example is the weight of an object or person riding in an elevator. When the elevator begins rising, the object begins exerting a force in the downward direction. If a scale was used, it would be seen that the weight of the object is becoming heavier because of the downward force, changing the apparent weight.

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text: Then the radical center is the point

text: Then the radical center is the point

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answers: Gravity acts only between objects that are touching

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text: Gravity's Rainbow is a 1973 novel by American writer Thomas Pynchon.

text: Gravity's Rainbow is a 1973 novel by American writer

text: Thomas Pynchon

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text: coordinates and a single

text: coordinates and a single

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