Determine the smallest force the man must exert on the rope in order to move the crate of mass M. Also, what is the angle θ at this moment? The coefficient of static friction between the crate and the floor is μs.

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Given:
M = 80 kg
μ s = 0.3
α = 30 deg
β = 45 deg
g = 9.81m/s2

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