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0--long ladder has mass 11.0 and is leaning against a frictionless wall, making a 66 angle with the horizontal. If the coefficient of friction...

A 5.0--long ladder has mass 11.0 and is leaning against a frictionless wall, making a 66 angle with the horizontal. If the coefficient of friction between the ladder and ground is 0.42, what is the mass of the heaviest person who can safely ascend to the top of the ladder? (The center of mass of the ladder is at its center.)

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