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2 - A single-thread power screw has a diameter of 50 mm with a 5 mm pitch. A vertical load on the screw reaches a maximum of 10 kN. The coefficients of friction are 0.07 for the collar and 0.08 for the threads. The frictional diameter of the collar is 70 mm. Find the overall efficiency and the torque to "raise" and "lower" the load.
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