[问答题]
A wheel of mass M has radius R. It is standin jt;qg z4hnh7vt1 zlh*0o) s6pg verticapy. r/ rl 9j c-otdd8pj(.y1jc.wksk-lly on the floor, and we want to exert a horizontal force F at its axle so that it will climb a step agc1(rk j.kpor -y.sdlj jdpyw -c9./t8 ainst which it rests (Fig. 8–55). The step has height h, where h
Post time 2025-2-18 20:00:22
