A block of weight W is attached to a light rod AD that pivots at pin A. If the coefficient of static friction between the plane and the block is μs , determine the minimum angle θ at which the block may be placed on the plane without slipping. Neglect the size of the block in the calculation.

Given:

a = 4 ft

b = 2 ft

c = 3 ft

μ s = 0.4

W = 6 lb

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B.