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A straight ladder of length L has a mass M, which is uniformly distributed along its length. The ladder has one end on the horizontal ground and its other end leaning against a vertical wall. Assume that the ladder makes a flat contact at both the wall and the ground, and that the coefficients of static friction are Uw at the surface between the ladder and the wall, and Ug at the surface between the ladder and the ground. Let (theta) be the angle between the ladder and the ground. Find an expression for the value of (theta) at which the ladder will just begin to slip.

I am just confused by the question. i know that static friction is at a maximum value at both the ground and wall when the ladder begins to slip.