SAT Subject Physics Practice Question 383: Answer and Explanation

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Question: 383

4. A pendulum swings at a rate of .75 vibrations/second. The period of the vibrations would increase because…

A. Mass of the bob was increased
B. Length of the pendulum was increased
C. Mass of the bob was decreased
D. Length of the pendulum was decreased
E. Displacement from zero was increased

Correct Answer: B

Explanation:

The correct answer is (B). The period of the pendulum is . We can see from the equation that the shorter the length of the pendulum, the shorter is the period of the pendulum.

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