SAT Subject Physics Practice Question 45: Answer and Explanation

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Question: 45

2.

In an effort to tighten a bolt, a force F is applied as shown in the figure above. If the distance from the end of the wrench to the center of the bolt is 20 cm and F = 20 N, what is the magnitude of the torque produced by F ?

A. 0 N × m
B. 1 N × m
C. 2 N × m
D. 4 N × m
E. 10 N × m

Correct Answer: D

Explanation:

The torque is τ = rF = (0.20 m)(20 N) = 4 N • m.

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