5.92 block b, with mass figure p5.92 5.00 kg, rests on block a, with mass 8.00 kg, which in turn is on a horizontal tabletop (fig. p5,92). there is no fric- tion between block a and the tabletop, but the coefficient of static friction between blocks a and b is 0.750. a light string attached to block a passes over b a frictionless, massless pulley, and block c is suspended from the other end of the string. what is the largest mass that block c can have so that blocks a and b still slide together when the system is released from rest?