[填空题]
Calculate the net torque about the axle of the wz jo oa73a8v2 sbq:z.bheel shown in Fig. 8–39. Assu/ rwy4 nrc 3kjvs*m5(sdt)s (rt kq5,jme that a frmjy ttrv)jrs5 ,*4(sdk5 n wrs3qk c/(iction torque of 0.4 $m \cdot N$ opposes the motion. $m \cdot N$