[问答题]
Two blocks, each of pcxgj35 u:kzrmr* 00( i8 mrexm*jradwlqxw ;+7:hle; ass m, are attached 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 thew7alh*j l+ w;d;x:qren released. Calculate the magnitude and direction of the net torque on this system.