[问答题]
A wheel of mass M has radius R. It is standing vertically ttkwl2r .5)ucr y ms;l;0a dk/g2d( dlon the flo /ct- diy*klt6or, and we want to exert a horizontal force F at its axle so that it will climb a step against which it rests (Fil*-yd6tkt/ ci g. 8–55). The step has height h, where h
Post time 2025-2-18 20:00:22
