Physics 121 General Physics
Concept Quizzes
Chapter 13 Universal Gravitation

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The Moon does not fall to Earth because
the net force on it is zero.
it is beyond the pull of Earth’s gravity.
it is being pulled by the Sun and planets as well as by the Earth.
None of the above.

A satellite in a circular orbit around the Earth has a period T. A second satellite in a circular orbit around the Earth with two times the orbital radius has period
T
2T
4 T

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