Question
question 88
moment of inertia of the wheel? The external torque is then removed, and a brake is applied. If it takes the wheel 200 s to come to rest after the brake is applied, what is the magnitude of the torque exerted by the brake? 8 A flywheel of mass 35.0 kg and diameter 60.0 cm spins at 400 rpm when it experiences a sudden power loss. The flywheel slows due to friction in its bearings during the 20.0 s the power is off. If the flywheel makes 200 complete revolutions during the power failure, (a) at what rate is the flywheel spinning when the power comes back on? (b) How long would it have taken for the flywheel to come to a complete stop? 8-53 m 83 0 cm 7n. n 89. A solid cylindrical pulley with a mass of 1 00 o nd a rdine of
Explanation / Answer
theta = wo*t + 1/2 * alpha*t^2
theta = 200 * 2pi = 400 pi rad
wo = 400 rpm = 41.8879 rad/s
t = 20 sec
alpha = 2.094 rad/s^2
part b )
t = 41.8879/2.094 = 20s
