[问答题]
Two blocks, each of ma6 t6pq)lbll*:oeyaef2kp kz ly6( .r (ss m, are att1l8svs.t wwyhn76p p:ached to the ends of a massless rod which pivots as shown in Fig. 8–40. Initially the rod is held in the horizontal position and then released. Calculate the magnitudwwy6:1 lp8t7ns vs.hp e and direction of the net torque on this system.