At what rate is the flywheel spinning when the power comes back on? A high-speed flywheel in a motor is spinning at 450rpm when a power failure suddenly occurs. The flywheel has mass 44.0kg and diameter 77.0cm. The power is off for 32.0s and during this time the flywheel slows due to friction in its axle bearings. During the time the power is off, the flywheel makes 170 complete revolutions. 1. At what rate is the flywheel spinning when the power comes back on? 2. How long after the beginning of the power failure would it have taken the flywheel to stop if the power had not come back on? 3. How many revolutions would the wheel have made during this time? So it seems like if I get the first part the rest will be easy. This is what I have for the first part but it doesn't seem right. 170 revs = 1068.141502221 rad 450 rpm=47.1 rad/s t = 32.0 sec 1068.141502221 = 47.1 * 32 +0.5 * α * 32^2 So α = 0.528992424 rad/s?