A cable is attached to the plate B of mass MB, passes over a fixed peg at

Question:

A cable is attached to the plate B of mass MB, passes over a fixed peg at C, and is attached to the block at A. Using the coefficients of static friction shown, determine the smallest mass of block A so that it will prevent sliding motion of B down the plane.

Given:

MB = 20 kg μA = 0.2

θ = 30 deg μB = 0.3

g = 9.81m/s2 μC = 0.3

A cable is attached to the plate B of mass