[问答题]
A wheel of mass M has radius R. a jq/ , :iso:tr.q/qhh/onnv6It is standing (jc 2r kq 3/x8h+3 nyoyumt*ahvertically on the floor, and we want to exert a horizontal force F at its axle so that it will climb a step against which it 2(t3 y+u8nh3/kao x*jc rqy hmrests (Fig. 8–55). The step has height h, where h
Post time 2025-2-18 20:00:22
