Posted by **amy** on Friday, May 3, 2013 at 7:06pm.

A grindstone in the shape of a solid disk with diameter 0.520 and a mass of = 50.0 is rotating at = 860 . You press an ax against the rim with a normal force of = 250 (Figure 1) , and the grindstone comes to rest in 7.40 .

Find the coefficient of friction between the ax and the grindstone. You can ignore friction in the bearings.

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