How Many Turns Will a Spinning Cylinder Make Before Stopping Due to Friction?

[phy_irodov]

problem related to Torque...

hi friends...
I am new to this forum...
I just needed ur help...
can anyone plez sove this question...
A uniform cylinder or radius R is spinned about its axis to the angular velocity w and then placef into a corner ...,,,the coeff of friction b/w the corner walls and cylinder is equal to k...how many turns will the cylinder accomplish before it stops...?

 

[Doc Al]

Why don't you give it a try? What forces act on the cylinder? What's the net torque?