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Unformatted text preview: a) How far can the person climb up the ladder before it begins to slip? We have F x : F R = N W , where F R is the force of friction and N W is the normal force exerted by the wall, and F y : N G = W P + W L , where N G is the normal force exerted by the ground, W P is the weight of the person and W L is the weight of the ladder. We can put these together: F R = N G = ( W P + W L ) = N W . Now we calculate torque about the base of the ladder. : L N W sin( ) L/ 2 W L cos( ) x W P cos( ) = 0 . Thus: x = L ( W P + W L ) sin( ) L/ 2 W L cos( ) W P cos( ) = 2 . 51 m ....
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 Fall '06
 Buchler
 Physics, Acceleration, Gravity

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