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Blocks A and B have a mass of 170 kg and 90 kg , respectively. (Figure...

Blocks A and B have a mass of 170 kg and 90 kg , respectively. (Figure 1) Part A If the coefficient of static friction between A and B and between B and C is ??s = 0.20, and between the ropes and the pegs D and E ??'?s= 0.80, determine the smallest force F needed to cause motion of block B if P = 24 N .

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