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Rotational Motion question

2019 · 10 Jan · Shift 1 · Q60
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  5. /2019 · 10 Jan · Shift 1 · Q60

Rotational Motion question

2019 · 10 Jan · Shift 1 · Q60

JEE MainPhysicsRotational MotionMCQ+4 / −1
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\muμ, the torque, applied by the machine on the mop is -
  1. A
    μ\muμ FR/2
  2. B
    μ\muμ FR/3
  3. C
    μ\muμ FR/6
  4. D
    23μ{2 \over 3}\mu32​μ FR
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