[问答题]
Two blocks, each of mass m, are attached to the ends of a masslyp 98z b4wpx5u9d xf7lessy5uoyvk 9 /(yl rod which pivots as shown in Fig. 8–40. Initially the rod is held in the horizontal position and then released. Calculate the magnit( kyyuo y/l5v9ude and direction of the net torque on this system.