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A 50.0-kg grindstone is a solid disk 0.510 m in diameter. You press an ax down...

A 50.0-kg grindstone is a solid disk 0.510 m in diameter. You press an ax down on the rim with a normal force of 180 N . The coefficient of kinetic friction between the blade and the stone is 0.60, and there is a constant friction torque of 6.50N?m between the axle of the stone and its bearings.

A)How much force must be applied tangentially at the end of a crank handle 0.500 m long to bring the stone from rest to 120 rev/min in 8.00 s ?

B) After the grindstone attains an angular speed of 120 rev/min, what tangential force at the end of the handle is needed to maintain a constant angular speed of 120 rev/min?

C) How much time does it take the grindstone to come from 120 rev/min to rest if it is acted on by the axle friction alone?

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