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In the figure below, a uniform plank, with a length L of 6.20 m and a weight of 460 N, rests on the ground and against a frictionless roller at the top of a wall of height h = 3.10 m. The plank
remains in equilibrium for any value of e z 70° but slips if e < 70°. Find the coefficient of static friction between the plank and the ground.
Roller

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