[问答题]
Two blocks, each of mass m, are attach 9aoxut1: ko 2(hz9os 8jlwu3 ,pd ljgu22qrp(ed to the ends of a massless rod whi nl8 bj2 uuxj7500x-pd6hywjm ch pivots as shown in Fig. 8–40. Initially the rod is held in the horizon 80u0jdx juhmbpy57l-j2 6n xwtal position and then released. Calculate the magnitude and direction of the net torque on this system.