Finding Friction Force on a Break Pad

[lostHope]

A 30-cm-diameter, 1.6 kg solid turntable rotates on a 1.4-cm-diameter, 450 g shaft at a constant 33 rpm. When you hit the stop switch, a brake pad presses against the shaft and brings the turntable to a halt in 15 seconds.

How much friction force does the brake pad apply to the shaft?

I am struggling with answering this problem and I am not too sure how to approach it.

 

[sophiecentaur]

Hi
This is a homework problem so please post it in the appropriate place. See the top of the Forum Page: "NO HOMEWORK Etc. Etc."
There is a standard way to present your question which involves showing what you have done so far.