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A uniform ladder of length L and mass m(...

A uniform ladder of length `L` and mass `m_(1)` rests against a frictionless wall. The ladder makes an angle `theta` with the horizontal. (a) Find the horizontal and vertical forces the ground exerts on the base of the ladder when a firefighter of mass `m_(2)` is a distance `x` from the bottom. (b) If the ladder is just on the verge of slipping when the firefighter is a distance d from the bottom, what is the coefficient of static friction between ladder and ground?

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