A solid flywheel of mass M and radius r ...

A solid flywheel of mass M and radius r revolves with an angular velocity m. With what force must a brake lining be pressed against it for the flywheel to stop in t seconds, if `mu` is the coefficient of friction?

`(Mromega)/(2mut)`

`(romega)/(2muMt)`

`(Momega)/(2murt)`

`(Momegat)/(2mur)`

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