SAT Subject Physics Practice Question 405: Answer and Explanation

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Question: 405

11. A child is swinging on a swing set. As the child reaches the lowest point in her swing

A. the tension in the rope is equal to her weight.
B. the tension in the rope supplies a centrifugal force.
C. her kinetic energy is at maximum.
D. her tangential acceleration equals gravity.
E. her angular velocity is minimum.

Correct Answer: C

Explanation:

The correct answer is (C). All the gravitational potential energy at the top of the child's swing pathway is converted into kinetic energy at the bottom of her swing pathway.

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