• Find the power required to drive a 40 mm power screw having single acme threads with a pitch of 6 mm. The nut is to move linearly at a speed of 33.4 mm/s and raise a load of W = 11.5 kN. The frictional coefficients are 0.10 for the threads and 0.15 for the collar. The frictional diameter for the collar is 60 mm.