[填空题]
Calculate the net torque about th1/ykke kxc.g3e axled s3-dk*mc +png a t;bh p*cgwp4yj1-2*eijr8 of the wheel shown in Fig. 8–39. Assume that a fe -pjt;rpwhsb1a *p*+* dk23g4jicg-cm 8ny driction torque of 0.4 $m \cdot N$ opposes the motion. $m \cdot N$
