A flywheel in the shape of a solid cylinder of radius R = 0.6m and mass M = 15kg can be
brought to an angular speed of 12 rad/sec in 0.6sec by a motor exerting a constant
torque. After the motor is turned off, the flywheel makes 20 revolutions before coming
to rest because of frictional losses (assumed to be constant during rotation). What
percentage of the power generated by the motor is used to overcome the frictional
forces?