Answered: 2 Earth TT John Glenn's orbit in…

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter7: Gravitation

Section: Chapter Questions

Problem 54A

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Question

On February 20, 1962, John Glenn made the first U.S.-manned flight around the Earth for three orbits on Friendship 7. With Earth at one focus, the orbit of Friendship 7 is given approximately by r = 4090.76/(1 - 0.0076 cos θ), where r is measured in miles from Earth’s center. Use the formula and the figure shown to solve, How far from Earth’s center was John Glenn at his greatest
distance from the planet? Round to the nearest mile. If the radius of Earth is 3960 miles, how far was he from Earth’s surface at this point on the flight?

2
Earth
TT
John Glenn's orbit
in Friendship 7

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