A $30-cm-$diameter, $1\mathrm{.}2$ kg solid turntable rotates on a $1\mathrm{.}0-cm-$diameter, $450$ g shaft at a constant $33$ rpm $.$ When you hit the stop switch, a brake pad presses against the shaft and brings the turntable to a halt in $15$ seconds.

Part A

How much friction force does the brake pad apply to the shaft?

Express your answer with the appropriate units.

View Available Hint$($s$)$

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