SAT Subject Physics Practice Question 337: Answer and Explanation

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Question: 337

33.

A pendulum is used on Earth and then transported to the moon where it is released and allowed to swing freely. Which of the following statements about the pendulum is correct?

A. The period of the pendulum on the moon is greater than it was on Earth.
B. The frequency of the pendulum on the moon is greater than it was on Earth.
C. The potential energy of the pendulum on the moon is greater than it was on Earth.
D. The kinetic energy of the pendulum on the moon is greater than it was on Earth.
E. The period, the frequency, the kinetic energy, and the potential energy of the pendulum on the moon are the same as they were on Earth.

Correct Answer: A

Explanation:

The correct answer is (A). Remember, the period of a pendulum is. Notice the g under the square root radical.The period of the pendulum is directly related to the gravitational acceleration. The moon's gravity is 1/6 the earth's gravity. That means the period of the pendulum on the moon is longer.

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