[问答题]
Two blocks, each of mass m, are attached to the ends of t8/9rgn*uny;d+ey5q 2drga a a massgv44upfq 8ami 79bi,b less rod which pivots as shown in Fig. 8–40. Initially the rod is held in the horizontal position and then released. Calculate the ma igfb7abv48q 9m ,pui4gnitude and direction of the net torque on this system.
