The disk weighs 50 lb and the bar weighs 25 lb. The coefficients of friction between the d...

The disk weighs 50 lb and the bar weighs 25 lb. The coefficients of friction between the disk and the inclined surface are μs = 0.6 and μk = 0.5.

(a) What is the largest couple M that can be applied to the stationary disk without causing it to start rotating?

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(b) What couple M is necessary to rotate the disk at a constant rate?