In the figure, a uniform plank, with a length L and a weight of W, rests on the ground and against a frictionless roller at the top of a wall of height h. The plank remains in equilibrium for any value of 0 = Po or more, but slips if 000. Find the coefficient of static friction between the plank and the ground. NOTE: Give your answer in terms of the variables given. L 0 Roller
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