[填空题]
Calculate the net torque abur2ft7xho/qkg/o: d9817lvxw w ;gchout t 4 5ql2( ihkmwfb ivbg52bd:i,f m82rb+uxgs:he axle of the wheel shown in Fig. 8–39. Assume that a friction gb8 vx2d:2lis 2bqiw rm,+(5fub4 ihf:m 5bkgtorque of 0.4 $m \cdot N$ opposes the motion. $m \cdot N$