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Two identical blocks of weight W are placed one on top of the other as shown in figure. The upper block is tied to the

Two identical blocks of weight W are placed one on top of the other as shown in figure. The upper block is tied to the wall. The lower block is pulled to the right with a force F. The coefficient of static friction between all surfaces in contact is μ. What is the largest force F that can be exerted before the lower block starts to slip?

  

F W

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