[填空题]
Calculate the net torque about the axle of the wheelzynebq -p ;fg84wm*:f shown in Fig. 8–39. Assume 4ye 8ffpngm-w: * bqz;/d tbgeoc8-,3z 59yj8s x qtffthat a fr 3g eftst ,d5q8j98x-c b/fzyoiction torque of 0.4 $m \cdot N$ opposes the motion. $m \cdot N$