Consider a double-collar bearing with a hole radius of 20 millimeters, experiencing an axial force of five kilonewtons. Collar A, with a radius of 40 millimeters, carries 75 percent of the force, while collar B, with a radius of 30 millimeters, carries 25 percent; both collars distribute pressure uniformly. Calculate the maximum frictional moment the bearing can resist, given a static friction coefficient of 0.3 for both collars. Recall the expression for the required maximum frictional moment. By rearranging and substituting the values of the forces supported by both collars, the maximum frictional moment can be determined. Next, modify the configuration by exerting an axial force of 15 kilonewtons on the bearing. Determine the minimum torque required to overcome the friction. Using the frictional moment equation and substituting the values, the moment for both collars caused by the frictional forces can be determined. By equating the sum of moments about the z-axis to zero and substituting the known values, the required minimum torque can be determined.