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A high-speed fly-wheel in a motor is spinning at 450 if a power failure suddenly takes place. The flywheel consists of mass 37.0 and diameter 77.0. The power is off for 35.0 and throughout this time the flywheel exhibits due to friction in its axle bearings. Throughout the time the power is off, the flywheel forms 180 complete revolutions.

How long after the starting of the power failure would it have taken the fly-wheel to stop if the power had not come back on?

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