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A uniform ladder stands on a rough floor and rests against a frictionless wall as...

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A uniform ladder stands on a rough floor and rests against a frictionless wall as shown in the figure Since the floor is rough it exerts both a normal force N and a frictional force f on the ladder However since the wall is frictionless it exerts only a normal force N on the ladder The ladder has a length of L 4 00 m a weight of W 60 0 N and rests against the wall a distance d 3 75 m above the floor If a person with a mass of m 90 kg is standing on the ladder determine the following N N 1 a the forces exerted on the ladder when the person is halfway up the ladder Enter the magnitude only N N N b the forces exerted on the ladder when the person is three fourths of the way up the ladder Enter the magnitude only N N

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