SAT Subject Physics Practice Question 413: Answer and Explanation

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Question: 413

4. The time it takes a satellite to make one orbit around the earth depends on the satellite's

A. acceleration.
B. weight.
C. direction of rotation.
D. distance from earth.
E. launch speed.

Correct Answer: D

Explanation:

The correct answer is (D). The centripetal force required to keep a satellite in orbit remains constant. That means the closer to earth a satellite is, the faster it must travel in its orbit Fc = mV2/r . The farther the satellite is located from the earth, the slower it travels in orbit.

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