Work Problem 1, but with the efficiency at 75%.
Problem 1
A square thread screw has an efficiency of 70% when raising a weight. The coefficient of friction is μ1 = 0.12 with collar friction negligible. The load is 8000 lb and the pitch diameter is 1.15 in. Find the torque that a brake mounted on the screw must exert when lowering the load at a uniform rale.
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