AP Physics 1 Question 236: Answer and Explanation

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Question: 236

6. A uniform meter stick of mass 1 kg is hanging from a thread attached at the stick's midpoint. One block of mass m = 3 kg hangs from the left end of the stick, and another block, of unknown mass M, hangs below the 80 cm mark on the meter stick. If the stick remains at rest in the horizontal position shown above, what is M ?

  • A. 4 kg
  • B. 5 kg
  • C. 6 kg
  • D. 8 kg

Correct Answer: B

Explanation:

B

The stick will remain at rest in the horizontal position if the torques about the suspension point are balanced: