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26 Nov 2019
A high-speed flywheel in a motor is spinning at 450 rpm when apower failure suddenly occurs. The flywheel has mass 39.0 kg anddiameter 74.0 cm. The power is off for 26.0 s and during this timethe flywheel slows due to friction in its axle bearings. During thetime the power is off, the flywheel makes 170 complete revolutions.At what rate is the flywheelspinning when the power comes back on? How long after the beginning of the power failurewould it have taken the flywheel to stop if the power had not comeback on? How many revolutionswould the wheel have made during this time?
A high-speed flywheel in a motor is spinning at 450 rpm when apower failure suddenly occurs. The flywheel has mass 39.0 kg anddiameter 74.0 cm. The power is off for 26.0 s and during this timethe flywheel slows due to friction in its axle bearings. During thetime the power is off, the flywheel makes 170 complete revolutions.At what rate is the flywheelspinning when the power comes back on? How long after the beginning of the power failurewould it have taken the flywheel to stop if the power had not comeback on? How many revolutionswould the wheel have made during this time?
