[问答题]
A wheel of mass M has radius R. f j0(e1v6y (vf :lp zm2murk-oIt is standing vertically on hiv *q6n 3y5hjthe 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 heighn vy3*5ij 6qhht h, where h
Post time 2025-2-18 20:00:22
