SAT Subject Physics Practice Question 385: Answer and Explanation

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Question: 385

6. A pendulum swings at a rate of .75 vibrations/second. The velocity of the pendulum 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: E


The correct answer is (E). An increase in the displacement of the pendulum raises the pendulum bob to a greater height, which gives it more potential energy. When the bob passes through the zero point, the potential energy will be transformed into greater kinetic energy, which means a greater velocity.

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