Question

(a) Two boxes of different mass are at rest on a ramp. What is the minimum coefficient of static friction between the boxes and the ramp if the system is in equilibrium? Given M=(1+0.34)m
(b) Suppose there is no friction between the upper box and the ramp. What is minimum coefficient of friction between the ramp and the lower box is needed for equilibrium?
Mass doesn't matter. The angle and the friction coefficient do.

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