Block A weighs 43 N and block B weighs 27 N. The two blocks are connected by an inextensible massless string that passes over a frictionless pulley. If the coefficient of static friction between block A and the surface on which it is resting is µs = 0.2, what is the minimum weight of block C, placed on top of block A, that will prevent A from sliding? (Units: Newtons) A B.
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