[问答题]
Two blocks, each of mass m, are attached to tyc3 m: u+j/oz;mego ;nhe ends ofp waq3*jdno7z,q kn7+atu,i . a massless rod which piv.jazq7o+k 7 qa, n3*t ,iundpwots as shown in Fig. 8–40. Initially the rod is held in the horizontal position and then released. Calculate the magnitude and direction of the net torque on this system.