AP Physics 1 Question 449: Answer and Explanation
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7. A 5 kg box is connected to a pulley with rope in the diagram shown below. If the radius of the pulley is 0.5 m, what is the torque generated by the box on the pulley?
- A. 10 N·m
- B. 25 N·m
- C. 50 N·m
- D. 75 N·m
Correct Answer: B
The weight of the box pulls down on the rope, producing tension that creates a torque on the pulley. This torque is equal to
τ = rF = rFg = rmg = 0.5 m(5 kg)(10 m/s2) = 25 N·m