[问答题]
A wheel of mass M has radius R. It is standing verti/n.hp5c;lt.ft ol4 s hcally c,(eq,jytskf o1:nt5n;q86n m0 ljx don 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( 1 snq ,enmx6o j:t cd8l;k50t,jqfny, where h
Post time 2025-2-18 20:00:22
