The 20-lb block A is at rest against the 100-lb block B as shown. The coefficient of

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The 20-lb block A is at rest against the 100-lb block B as shown. The coefficient of static friction μs is the same between blocks A and B and between block B and the floor, while friction between block A and the wall can be neglected. Knowing that 30 P = lb, determine the value of μs for which motion is impending.



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