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# HW19 - schneiter(tcs639 HW19 Ross(89152 This print-out...

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schneiter (tcs639) – HW19 – Ross – (89152) 1 This print-out should have 7 questions. Multiple-choice 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 Newton’s 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 Earth’s surface so that its weight is reduced to 56 . 5 % of its weight at the Earth’s 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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HW19 - schneiter(tcs639 HW19 Ross(89152 This print-out...

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