[问答题]
A wheel of mass M has radius R. It i,4yutft 6/vd6x0y wah s standing verticallyl(fvi,g7f , frfsc ndnv75:3;y7z sgt on the floor, and we want to exert a horizontal force F at its axle 7s (gfzvvgd,5n:,f7 yfir;cn7 t 3lfsso that it will climb a step against which it rests (Fig. 8–55). The step has height h, where h
Post time 2025-2-18 20:00:22
