Question

A high-speed flywheel in a motor is spinning at 450 rpm when a power failure suddenly...

A high-speed flywheel in a motor is spinning at 450 rpm when a power failure suddenly occurs. The flywheel has mass 37.0 kg and diameter 74.0 cm . The power is off for 26.0 s 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.

Part A

At what rate is the flywheel spinning when the power comes back on?

w = ?

Part B

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?

t = ?

Part C

How many revolutions would the wheel have made during this time?

N= ? rev

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