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Q: To mop-clean a floor, a cleaning machine presses a circular mop of radius R vertically down with a total force F and rotates it with a constant angular speed about its axis. If the force F is distributed uniformly over the mop and if coefficient of friction between the mop and the floor is μ, the torque, applied by the machine on the mop is:
  • A. μFR/2
  • B. μFR/6
  • C. μFR/3
  • D. 2μFR/3
Correct Answer: Option D -
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Explanations:

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