The fan rotates at 140 rpm. After turning off the fan

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The fan rotates at 140 rpm. After turning off the fan, rotating slowly, made up to a stop 22 turns. The work of the braking forces is 39 J. Find the moment of inertia of the fan and the moment of the braking forces.

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Task 31643. A detailed solution with a brief record of the condition, formulas and laws used in the solution, the derivation of the calculation formula and the answer.
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