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In the figure, a uniform plank, with a length L of 5.23 m and a weight...

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Physics

In the figure, a uniform plank, with a length L of 5.23m and a weight of 280 N, rests on the ground and against africtionless roller at the top of a wall of height h =1.59 m. The plank remains in equilibrium for any value ofθ = 70.0° or more, but slips if θ < 70.0°.Find the coefficient of static friction between the plank and theground.

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