A 7.50 kg disk with a diameter of 88.0 cm is spinning at a rate of 280 revolutions per minute. A block of wood is pressed into the edge of the disk with a force of 35.0 N. The coefficient of friction between the wood and the disk is 0.300. How long does it take the disk to stop spinning?

Time taken by disk to stop spinning will be 4.60 sec

Explanation:

It is given mass m = 7.50 kg

Diameter of the disk d = 88 cm = 0.88 m

So radius of the disk

Angular speed of the disk

Force is given F = 35 N

Coefficient of friction

Friction force will be equal to

So torque will be equal to

Torque is also equal to

Moment of inertia of the disk

So

So time taken will be equal to

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