Question

A uniform grindstone wheel, in the shape of a solid disk, has mass 9.00kg and radius...

A uniform grindstone wheel, in the shape of a solid disk, has mass 9.00kg and radius 10.0cm.

a) Calculate the rotational kinetic energy of the grindstone as it turns at 30.0revs/second.

Immediately after the motor for the grindstone is turned off, a knife blade is pressed against the outer edge of the grindstone. The knife blade is pressed perpendicular to the grindstone with a force of 10.0N. The coefficient of friction between the blade and stone is 0.800.

b) Determine the torque on the flywheel due to the blade.

c) Determine the angular acceleration on the wheel once the blade is pressed against it.

d) Determine the angular velocity at 6.00 seconds. [81.8rads/s]

e) Determine the number of revolutions through which the wheel passes at 6.00 seconds

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