SAT Subject Physics Practice Question 52: Answer and Explanation

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Question: 52

9. The mean distance from Saturn to the sun is 9 times greater than the mean distance from Earth to the sun. How long is a Saturn year?

A. 18 Earth years
B. 27 Earth years
C. 81 Earth years
D. 243 Earth years
E. 729 Earth years

Correct Answer: B


Kepler’s Third Law says that T2R3 for a planet with a circular orbit of radius R. Since T, if R increases by a factor of 9, then T increases by a factor of

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