Part 1. The masses of A, B, and C are 5 kg, 15 kg, and 100 kg,…

Part 1. The masses of A, B, and C are 5 kg, 15 kg, and 100 kg,…

Part 1. The masses of A, B, and C are 5 kg, 15 kg, and 100 kg, respectively.

The coefficient of friction between all contacting surfaces is 0.3. Calculate the minimum force F required to start C moving upward. Part 2. The Vise shown in figure below exerts 100-lb force on A. The threaded shafts are subjected only to axial loads by the jaws of the vise. The pitch of their threads is p=0.15, the mean radius of the treads is r=1.5 inch, and the coefficient of static friction between the treads and the mating groves is 0.25. Suppose that you want to loosen the vise by turning one of the shafts. Determine the couple you must apply to shaft b and to shaft c.

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