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Chapter 10 Gravitation - Planetary and Satellite Motion
Chapter 10 Gravitation - Planetary and Satellite Motion

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Solutions to semester2 practice problems - Head

... a. what is the weight of the object? mg = 20N b. what is the mass of the object? m = 2 kg c. what is the force of gravity acting on the object? mg = 20N d. what is the acceleration when it falls (ignoring air resistance)? a = 10 m/s/s e. what is the value of “g” for this object? g = 10 m/s/s 5. A 1 ...
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... Maintain constant lift velocity to avoid acceleration forces. © 2008 McGraw-Hill Higher Education. All Rights Reserved. ...
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... •  Thus the electric force can be written: •  Note that this force is for “point” charges at rest. *Mirriam-Webster, Permittivity: The ability of a material to store electrical potential energy under the influence of an electric field Tuesday, Aug. 30, 2011 ...
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... George Atwood was an English mathematician, living near the turn of the 17th century, who invented a machine for illustrating the law of uniformly accelerated motion. Two masses are suspended from a pulley as shown to the right. The system is accelerated by the different in the force of gravity on t ...
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... skill and sport. Some skills, such as punches in boxing, require tremendous forces applied over a very short time frame. Other skills like throwing a javelin require forces applied over a longer timeframe. An expert javelin thrower accelerates the javelin by pulling it from way behind his body and r ...
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... • Fluid friction acting on an object moving through the air is known as air resistance. • Fluid friction increases as the speed of the object moving through the fluid increases. ...
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... • Inertia is the tendency of an object to resist a change of motion Newton’s first law of motion states that an object will remain at rest or in constant straight-line motion unless unbalanced forces act on the object. • Newton’s second law of motion states that the acceleration of an object increas ...
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4Making sense of the Universe

< 1 ... 86 87 88 89 90 91 92 93 94 ... 396 >

Gravity

Gravity or gravitation is a natural phenomenon by which all things with mass are brought towards (or 'gravitate' towards) one another including stars, planets, galaxies and even light and sub-atomic particles. Gravity is responsible for the complexity in the universe, by creating spheres of hydrogen, igniting them under pressure to form stars and grouping them into galaxies. Without gravity, the universe would be an uncomplicated one, existing without thermal energy and composed only of equally spaced particles. On Earth, gravity gives weight to physical objects and causes the tides. Gravity has an infinite range, and it cannot be absorbed, transformed, or shielded against.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; and resulting in time dilation, where time lapses more slowly in strong gravitation. However, for most applications, gravity is well approximated by Newton's law of universal gravitation, which postulates that gravity is 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 proportional to the product of their masses and inversely proportional to the square of the distance between them. This is considered to occur over an infinite range, such that all bodies (with mass) in the universe are drawn to each other no matter how far they are apart.Gravity is the weakest of the four fundamental interactions of nature. The gravitational attraction is approximately 10−38 times the strength of the strong force (i.e. gravity is 38 orders of magnitude weaker), 10−36 times the strength of the electromagnetic force, and 10−29 times the strength of the weak force. As a consequence, gravity has a negligible influence on the behavior of sub-atomic 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 force at the macroscopic scale, that is the cause of the formation, shape, and trajectory (orbit) of astronomical bodies, including those of asteroids, comets, planets, stars, and galaxies. It is responsible for causing the Earth and the other planets to orbit the Sun; for causing the Moon to orbit the Earth; for the formation of tides; for natural convection, by which fluid flow occurs under the influence of a density gradient and gravity; for heating the interiors of forming stars and planets to very high temperatures; for solar system, galaxy, stellar formation and evolution; and for various other phenomena observed on Earth and throughout the universe.In pursuit of a theory of everything, the merging of general relativity and quantum mechanics (or quantum field theory) into a more general theory of quantum gravity has become an area of research.
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