[问答题]
A wheel of mass M has radie n qrep*nh7+24b.uopw7 kq*3c 6bqsrus R. It is standing vertically 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 rests (Fig. 8–55). The step has height h, wheq uqk*bcb6o.r7 p43ws re h
Post time 2025-2-18 20:00:22
