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A thin uniform disk of radius r and mass m is spinning about its center at...

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Physics

A thin uniform disk of radius r and mass m is spinning about itscenter at angular speed ω0. The disk is placed flat on a horizontalsurface. The coefficient of kinetic friction between the disk andthe surface is μ and constant for the entire area of contact. a)Find the frictional torque on the disk. (Hint: Divide the disk intomany concentric rings.) b) How long will it take the disk to cometo rest?

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