How much friction force should the brake apply to the rim

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Q. The 3.4 kg, 32 cm diameter disk is spinning at 350 rpm. How much friction force should the brake apply to the rim to bring the disk to a halt in 2 s?

Q. How high will a 1.85 rock go if thrown straight up by someone who does 75 of work on it? Avoid air resistance.

Reference no: EM1371359

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