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A 2.0 m long, 200 N uniform ladder, rests with one end against a smooth wall...

A 2.0 m long, 200 N uniform ladder, rests with one end against a smooth wall making an angle of 30 degrees with the wall. The coefficient of friction between the ground and the lower end of the ladder is .5. With how large a force can you push the upper end of the ladder parallel to the wall before it starts to slip down?

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