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Block A in Fig. P5.76 weighs 60.0 N. The coefficient of

Chapter 8, Problem 72P

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QUESTION:

Block A in ?Fig. P5.76? weighs 60.0 N. The coefficient of static friction between the block and the surface on which it rests is 0.25. The weight w is 12.0 N, and the system is in equilibrium. (a) Find the friction force exerted on block A. (b) Find the maximum weight w for which the system will remain in equilibrium.

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QUESTION:

Block A in ?Fig. P5.76? weighs 60.0 N. The coefficient of static friction between the block and the surface on which it rests is 0.25. The weight w is 12.0 N, and the system is in equilibrium. (a) Find the friction force exerted on block A. (b) Find the maximum weight w for which the system will remain in equilibrium.

ANSWER:

Solution 72P a)The system is in equilibrium Apply the Newton’s first law to block A,to the hanging weight and the knot where the cords meet.Target are the two forces In free diagram of the hanging block F yma y Equate the vertical forces T w = 0 3 T 3 12 N In free diagram of t

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