Extracted text: Question 2 A square threaded power screw with double thread shown in Figure 2 is used to raise a load, W. The screw has a major diameter, d, and a pitch, p. The thrust collar has a mean diameter, dc. The screw has a starting friction coefficient, f, whereas the collar has a starting friction coefficient, fc. Estimate the starting torque, T, for raising the load. Figure 2 Variable Value Unit 4,000 d 25 mm 5 mm de 48 mm 0.14 fc 0.12