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73. A uniform ladder is 10 m long and weighs 200 N. The ladder leans against...

73. A uniform ladder is 10 m long and weighs 200 N. The ladder leans against a vertical, frictionless wall at height h = 8.0 m above the ground. A horizontal force F is applied to the ladder at distance d = 2.0 m from its base ( measured along the ladder ).

a) If force magnitude F = 50 N what is the force of the ground on the ladder, in unit-vector notation? answer (35 i + 200 j) N

b) If F = 150 n, what is the force of the ground on the ladder, also in unit-vector notation? answer ( -45 i + 200 j) N

c) Suppose the coefficient of static friction between the ladder and the ground is 0.38 fro what minimum value of the force magnitude F will the base of the ladder just barely start to move towards the wall? answer 1.9 x 10^2 N

Science   Advanced-Physics   
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