SAT Subject Physics Practice Question 23: Answer and Explanation

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Question: 23

14. The planet Pluto has 1/500 the mass and 1/15 the radius of Earth. What is the value of g on the surface of Pluto?

A. 0.3 m/s2
B. 1.6 m/s2
C. 2.4 m/s2
D. 4.5 m/s2
E. 7.1 m/s2

Correct Answer: D


The gravitational acceleration at the surface of a planet of mass M and radius R is given by the equation g = GM/R2. Therefore

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