[问答题]
A wheel of mass M hasc4*ph*lab 0 ito8v9gc1d o4ko b+3wey radius R. It is standing vertically on 5rmq;gvbf 61cl hud 4;lpv76 ls2.- lprn5yk xthe floor, and we want to exert a horizontal force F at its axle so that itv v167knmlc.4b x5;5lrpl f6l;uyq-grs d2hp 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
