SAT Subject Physics Practice Question 22: Answer and Explanation

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Question: 22

13. A moon of mass m orbits a planet of mass 100m. Let the strength of the gravitational force exerted by the planet on the moon be denoted by F1, and let the strength of the gravitational force exerted by the moon on the planet be F2. Which of the following is true?

A. F1 = 100F2
B. F1 = 10F2
C. F1 = F2
D. F2 = 10F1
E. F2 = 100F1

Correct Answer: C

Explanation:

The gravitational force that the moon exerts on the planet is equal in magnitude to the gravitational force that the planet exerts on the moon (Newton’s third law).

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