Find Coefficient of Friction: Grindstone Problem

[Arielf04]

Please give me a hint on what should I follow in order to solve the problem I am stuck and have no clue

A grindstone in the shape of a solid disk with diameter 0.530 and a mass of = 50.0 is rotating at = 830 . You press an ax against the rim with a normal force of = 260 , and the grindstone comes to rest in 7.80 .

Find Coefficient of friction between the axe and the grinding stone.

 

[Hootenanny]

Do you know any rotational dynamics, specifically kinematic equations of such?

 

[Arielf04]

Well this is what I know

K= 1/2 M(Vcm)^2 + 1/2 (Icm) W^2

Since the center of mass is not moving then?

K=1/2 (Icm) W^2?