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Unformatted text preview: schneiter (tcs639) HW19 Ross (89152) 1 This printout should have 7 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points Tom has a mass of 72 . 9 kg and Sally has a mass of 41 . 8 kg. Tom and Sally are standing 39 . 4 m apart on a massless dance floor. Sally looks up and she sees Tom. She feels an attraction. If the attraction is gravitation, find its mag nitude. Assume both can be replaced by spherical masses and that the gravitational constant is 6 . 67259 10 11 N m 2 / kg 2 . Correct answer: 1 . 3098 10 10 N. Explanation: Let : m T = 72 . 9 kg , m S = 41 . 8 kg , d = 39 . 4 m , and G = 6 . 67259 10 11 N m 2 / kg 2 . By Newtons universal law of gravitation, F = G m T m S d 2 = (6 . 67259 10 11 N m 2 / kg 2 ) (72 . 9 kg) (41 . 8 kg) (39 . 4 m) 2 = 1 . 3098 10 10 N . 002 10.0 points How high does a rocket have to go above the Earths surface so that its weight is reduced to 56 . 5 % of its weight at the Earths sur face? The radius of the Earth is 6380 km and the universal gravitational constant is 6 . 67 10 11 N m 2 / kg 2 ....
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This note was uploaded on 04/23/2009 for the course PHYS 152 taught by Professor Button during the Spring '08 term at IUPUI.
 Spring '08
 BUTTON
 mechanics, Mass

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