A Fire Fighter Tightens the Nut on the Top of a Fire

A fire fighter tightens the nut on the top of a fire hydrant using a large wrench. If she applies a force of 250 N perpendicular to the wrench, at a point 0.75 m from the axis of rotation of the nut, how much work does she do on the nut as she rotates it through 45°?

A) 190 J
B) 150 J
C) 290 J
D) 130 J

Correct Answer:

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