A spool has weight W = 450 lb, outer and inner radii R = 6 ft and ρ = 4.5 ft, respectively, center of mass G coinciding with its geometric center, and radius of gyration kG = 4.0 ft. The spool is being pulled to the right as shown, and the cable wrapped around the spool can be modeled as being inextensible and of negligible mass. Assume that the spool rolls without slip relative to both the cable and the ground. If the cable is pulled with a force P = 125 lb, determine the speed of the center of spool after 2 s and the minimum value of the static friction coefficient between the spool and the ground necessary to guarantee rolling without slip.
Figure P8.70
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