7-71 The 500-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If the force required to start the spool rotating is F = 110 lb, determine the coefficient of...

Extracted text: 7-71 The 500-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If the force required to start the spool rotating is F = 110 lb, determine the coefficient of friction between the ground and the spool. Neglect the diameter of the spindle compared to the diameter of the spool. 2 ft 2.8 ft Fig. P7.71