[问答题]
A wheel of mass M has radius R. I xo/23-reeodb.3 hbi7 jze4cqt is standing vertically tsz-0 +io2tfead,0 i/v nzqd)nq-u:oon the floor, and we want to exert a horizontal force F at its axle so that it will climb a step againfz,/-0nuo+t:niai od02v -d ztse )qqst which it rests (Fig. 8–55). The step has height h, where h
Post time 2025-2-18 20:00:22
