[问答题]
Two blocks, each of mass m,0kizw(iqc;k omu+b-g-59 lwm are at 3*e4ebur4b4od nd8oftached 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. Con8d3d*bf4 4eb o4erualculate the magnitude and direction of the net torque on this system.