76. S Review. A spool of wire of mass M and radius R is unwound under a constant force F (Fig. P10.76). Assum- ing the spool is a uniform, solid cylinder that doesn't slip, show that (a) the accel- eration of the center of mass is 4F/SM and (b) the force of friction is to the right and equal in magnitude to F/3. (e) If the cylinder starts from rest and rolls without slipping, what is the speed of its cen- ter of mass after it has rolled through a distance d? Figure P10.76

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