SAT Subject Physics Practice Question 296: Answer and Explanation

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Question: 296

67. The acceleration due to gravity on the moon is 1/6 of its value on Earth. If an object weighs 20 N on the moon, what is its mass on Earth?

A. 2 kg
B. 7.2 kg
C. 12 kg
D. 60 kg
E. 72 kg

Correct Answer: C


Since we know g = 10 m/s2 on the earth, the value of g on the moon must be (10) = m/s2. So, if an object weighs 20 N on the moon, its mass must be

Since mass does not vary with location, if the mass is 12 kg on the moon, it’s 12 kg here on Earth (and everywhere else).

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