[问答题]
A wheel of mass M has radius R. It is standing xq(pu 5smrl(;vertically on the floor, and we wpl(;5x(q m rus-rm fz2://cw3rj zy,akg xqck 0y0z a9ant to exert a horizontal force F at its axle so that it will climb a step against which it rests (F/3k zr- kyy90 jz,:02gracfqwczaxm/ig. 8–55). The step has height h, where h
Post time 2025-2-18 20:00:22
