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8. A massless ladder of length L has a mass M one-third of the way up, and a mass 2M two- thirds of the way

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8. A massless ladder of length L has a mass M one-third of the way up, and a mass 2M two- thirds of the way up. It leans against a frictionless wall. The feet of the ladder have a coefficient of static friction of 0.6 with the ground. What is the biggest angle the ladder can make with the wall before the ladder slips

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