To mop-clean a floor, a cleaning machine presses a circular mop of radius \( R \) vertically dow.... VIDEO
To mop-clean a floor, a cleaning machine presses a circular mop of radius \( R \) vertically down with a total
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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 \( \mu \), the torque, applied by the machine on the mop is:
(1) \( \mu F R / 3 \)
(2) \( \mu F R / 6 \)
(3) \( \mu F R / 2 \)
(4) \( \frac{2}{3} \mu F R \)
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