A piece of metal is pressed against the rim of a 28- kg, Physics

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A piece of metal is pressed against the rim of a 28- kg

A piece of metal is pressed against the rim of a 2.8- kg, 25- cm-diameter grinding wheel that is turning at 2800 rpm. The metal has a coefficient of friction of 0.80 with respect to the wheel. When the motor is cut off, with how much force must you press to stop the wheel in 20.0 s?

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