AP Physics 1 Question 449: Answer and Explanation

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Question: 449

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