[问答题]
A wheel of mass M hass2+h+l flnp (g6hf*vbex7 2il radiuqd7e 8y0b p -u1 o* xdv(bhhakz:sj.1ms R. It is standing vertically on the floor, and we wa.hb-8z(mey u:o j1 qkapx vs7hd*10dbnt 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, where h
Post time 2025-2-18 20:00:22
