A flywheel having a moment of inertia of 900 kg m2 rotates at a speed of 120 rev/min. It is slowed down by a brake to a speed of 90 rev/min. How much work was done by the brake?
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A flywheel having a moment of inertia of 900 kg m2 rotates at a speed of 120 rev/min. It is slowed down by a brake to a speed of 90 rev/min. How much work was done by the brake?
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