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University Physics with Modern Physics with Mastering Physics (11th Edition)

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12.84: a) From the result shown in Example 12.10, the force is attractive and its magnitude is proportional to the distance the object is from the center of the earth. Comparison with equations (6.8) and (7.9) show that the gravitational potential energy is given by ( 29 . 2 2 3 E E r R m Gm r U = This is also given by the integral of
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Unformatted text preview: r F to from g with respect to distance. b) From part (a), the initial gravitational potential energy is . 1 E E R m Gm Equating initial potential energy and final kinetic energy (initial kinetic energy and final potential energy are both zero) gives m/s. 10 90 . 7 so , 3 E E 2 × = = v R Gm v...
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