single square-thread screw has an input power of 3 kW at a speed of 1 rev/s. The screw has a diameter of 40 mm and a pitch of 8 m. The frictional coefficients are 0.16 for the threads and 0.09 for the collar, with a collar friction diameter of 50 mm. Find the axial esisting load Fand the combined efficiency of the screw and collar if the screw is raising the load. he axial resisting load Fis 7KN. he combined efficiency of the screw and collar is | | %.

4 A double-threaded power screw with square threads pushes against a load of 3,641 N at a speed of 15 mm/s. The screw has a major diameter of 20 mm and a pitch of 3 mm. The frictional coefficient of the threads is 0.25, and collar friction is negligible. What is the rotational speed of the screw in units of revolutions per minute? Type your answer 2 points

A gear drive is required to transmit a maximum power of 22.5KW, the velocity ratio is 1:2 and the rpm of the pinion is 200 .the approximate center distance between the shaft may be taken as 600mm.the teeth has 20°stub involute profile.the static stress for the gear material ( which is cast iron ) may be taken as 60MPa and face width as 10 times the module.find the module, face width and number of teeth on each gear.Check the design for dynamic and wear loads. The deformation factor in the buckling equation may be taken as 80 and material combination factor for the wear as 1.4

A drive shaft running at 2500 rpm has outer diameter of 80mm and innerdiameter of 60mm. The allowable shear stress in the shaft is 40MPa. Determine themaximum power that can be applied.