Question: A single square-threaded power screw is 25 mm in diameter with a lead distance of 5 mm. A vertical load (P) on the screw

A single square-threaded power screw is 25 mm in diameter with a

A single square-threaded power screw is 25 mm in diameter with a lead distance of 5 mm. A vertical load (P) on the screw reaches a maximum of 5 kN. The coefficients of friction are 0.09 for the threads and 0.06 for the collar. The frictional diameter of the collar is 45 mm. The torque to "raise" the load is (a) 7.83 Nm (b) 7.65 N.m (c) 10.43 N.m (d) 15.85 N.m Collar

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