Question

3- An electric motor can accelerate a Ferris wheel of moment of inertia (I =20 000 kg.m2) from rest to (10.0 rev/min) in (12.0 s). When the motor is turned off, friction causes the wheel to slow down from (10.0 to 8.00 rev/min) in (10.0 s). Determine (a) the torque generated by the motor to bring the wheel to 10.0 rev/min and (b) the power that would be needed to maintain this rotational speed