UNIVERSITY PHYSICS UCI PKG
UNIVERSITY PHYSICS UCI PKG
11th Edition
ISBN: 9781323575208
Author: YOUNG
Publisher: PEARSON C
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Chapter 13, Problem 13.21DQ

As part of their training before going into orbit, astronauts ride in an airliner that is flown along the same parabolic trajectory as a freely falling projectile. Explain why this gives the same experience of apparent weightlessness as being in orbit.

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A space shuttle is in a circular orbit at an altitude of 256 mi. Calculate the absolute value of g at this altitude and determine the corresponding weight of a shuttle passenger who weighs 156 lb when standing on the surface of the earth at a latitude of 45%. Are the terms "zero-g" and "weightless," which are sometimes used to describe conditions aboard orbiting spacecraft, correct in the absolute sense? Answers: 8h= Wh i ft/sec² lb
A space shuttle is in a circular orbit at an altitude of 238 mi. Calculate the absolute value of g at this altitude and determine the corresponding weight of a shuttle passenger who weighs 214 lb when standing on the surface of the earth at a latitude of 45°. Are the terms "zero-g" and "weightless," which are sometimes used to describe conditions aboard orbiting spacecraft, correct in the absolute sense? Answers: ft/sec² gh Wh= lb i
The International Space Station (ISS) orbits the Earth in a nearly circular orbit that is 345 km above the Earths surface. (a) How many hours does it take for the ISS to make each orbit? (b) Some of the experiments performed by astronauts in the ISS involve the effects of “weightlessness” on objects. What gravitational force does the Earth exert on a 10 kg object in the ISS? Express your answer in newtons and as a fraction of the force that Earth would exert on the object at Earth’s surface. (c) Considering your answer in part 2(b) above, how can an object be considered weightless in the ISS? 3. Two planets, both of mass m, are separated by a distance d. Their relative velocity is negligible, and there is an inertial frame in which both planets are essentially at rest. The gravitational potential u(r) at the position r in the presence of the two planets, located at R1 and R2, is given as u(r) = − Gm R1 −r − Gm R2 −r . This problem takes place far out in space and there are no other…

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