Suppose a penny is resting on the top of a turntable that is rotating at 45 rev/min = 4.71 rad/sec. The radius of the turntable is 20 cm. The mass of the penny is 3.3 grams. If the penny’s angular speed decreases to 2.71 rad/s over a 4 second time period, find the change in angular momentum of the penny then calculate the average torque acting on the penny. The penny’s distance from the axis of rotation is 10cm
