# Rotational Dynamics

A grinding wheel in the shape of a uniform disk of radius 16 cm is rotating at 900 revolutions per minute. The total mass of the wheel is 2.1 kg, which is uniformly distributed. A piece of steel is pressed in the normal direction against the wheel with a force of 9 Newtons. The coefficient of friction between steel and wheel is .21. How long will it take the wheel to stop?

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#### Solution Preview

A grinding wheel in the shape of a uniform disk of radius 16 cm is rotating at 900 revolutions per minute. The total mass of the wheel is 2.1 kg, which is uniformly distributed. A piece of steel is pressed in the normal direction against the wheel with a force of 9 Newtons. The coefficient of friction between steel and wheel is .21. ...

#### Solution Summary

The solution examines step by step solution provided. The rotational dynamics for grinding wheel is determined.