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Q. A flywheel in a motor is spinning at 580 {rm rpm} when a power failure suddenly occurs. The flywheel has mass 40.0 {rm kg} and diameter 75.0 {rm cm}. The power is off for 38.0 {rm s}, and during this time the flywheel slows down uniformly due to friction in its axle bearings. During the time the power is off, the flywheel makes 220 complete revolutions.

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