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Ch_10_homeworks

Ch_10_homeworks - Chapter 15 Homework Problems 15-61 10.1 A...

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Chapter 15: Homework Problems 15-61 10.1 A force P acts on a block having a mass of m with the block resting on a rough incline. The coefficients of static and kinetic friction between the block and the incline are μ s and μ k , respectively. (a) Determine the minimum force P required to hold the block in equilibrium. (b) Determine the minimum force P required to initiate motion of the block up the incline. Use the following parameter values: m = 10 kg , μ s = 0 . 2, μ k = 0 . 1 and θ = 30 .
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15-62 Chapter 15: Homework Problems 10.2 A L-shaped bar is pinned to ground at end B. End A of the bar rests on a block that sits on a rough horizontal surface C. A vertical force F acts downwardly on the bar, as shown in the figure below. Let μ sA and μ sC represent the coefficients of static friction at A and C, respectively. A horizontal force P acts to the right on the block. Let m be the mass of the block, and consider the mass of the bar to be negligible. Determine the minimum force P required to initiate motion of the block to the right. Use the following parameter values: m = 40 kg , F = 100 N , μ aA = μ sC = 0 . 3, L = 2 meters and h = 1 meter .
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Chapter 15: Homework Problems 15-63 10.3 Blocks A and B (having masses of m A and m B , respectively) are connected by the cable-pulley system shown. Block A rests on a rough, horizontal surface with μ s being the coefficient of static friction between A and the horizontal surface. A horizontal force P acts to the left on block A, as shown below in the figure. Consider the pulleys to be ideal. (a) Determine the minimum force P required to hold the system in equilibrium. (b) Determine the minimum force P required to initiate motion of block A to the left.
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