A tool whose coefficient of kinetic friction with the wheel is 0.60 is pressed perpendicularly against the wheel with a force of 40.0 N. What torque must be supplied by the motor to keep the wheel rotating at a constant angular velocity?

The torque must be supplied by the motor to keep the wheel rotating at a constant angular velocity is 12 N-m.

Explanation:

Given that,

The  coefficient of kinetic friction with the wheel is 0.60

Force acting against the wheel, F = 40 N

Let the distance is, r = 0.5 m

Torque is given by the product of force and distance. Here, the force will be :

Torque is given by :

So, the torque must be supplied by the motor to keep the wheel rotating at a constant angular velocity is 12 N-m.