My problem:(adsbygoogle = window.adsbygoogle || []).push({});

A grindstone in the shape of a solid disk with diameter=0.480m and a mass of m=50.0kg is rotating at omega = 820rev/min. You press an ax against the rim with a normal force of F=190N View Figure , and the grindstone comes to rest in 8.00s.

I need to find the coefficient of friction between the ax and the grindstone.

well the stuff i have some far is that the moment of Inertia is 1/2MR^2. That is really all that I have I just need a hint or something on how to proceed...if someone could help me out.

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# Homework Help: Stopping a rotating disk with an axe

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