5.94 block b, with
mass 5.00 kg, rests on
block a, with mass
8.00 kg, which in turn is
on a horizontal tabletop
(fig. p5.94). there is no
friction between block a and the tabletop, but the coefficient of
static friction between block a and block b is 0.750. a light string
attached to block a passes over 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?