To mop-clean a floor, a cleaning machine... | Rigid Body Dynamics

JEE Main 2019

10-01-2019 S1

Question

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

Select the correct option:

$\frac{\mu \mathrm{FR}}{2}$

$\frac{\mu \mathrm{FR}}{3}$

$\frac{\mu \mathrm{FR}}{6}$

$\frac{2}{3} \mu \mathrm{FR}$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution