[问答题]
A wheel of mass M has radnqijo+*c mm 23ius R. It is standing vertically-empd o/evi 14 on the floor, and we want to exert a horizontal force F at its axle so that it will climb a step against which it rests (Fig. 8–55). The step has height h, w-e4vidpe 1o/m here h
Post time 2025-2-18 20:00:22
