An electric motor is used to lift a load of 5 kg by means of a rope wrapped round a pulley of radius 600 mm driven by the motor. Determine (a) the torque that needs to be exerted and (b) the work done...

An electric motor is used to lift a load of 5 kg by means of a rope wrapped round a pulley of radius 600 mm driven by the motor.

Determine (a) the torque that needs to be exerted and (b) the work done when the pulley has to make 15 revolutions to lift the load.