[问答题]
A wheel of mass M has radius R. It is standin . 8wsv:i:ybuq8nn;xxg vertically on the floor,.1qgl.yd :8u:6 lzv /rc m.yr vqo)vlf and we want to exert a horizontal force F at its axle so that it will climb a step against which it rests .l: .y)m. v q8d qyvolzu6cgvlr1/rf:(Fig. 8–55). The step has height h, where h
Post time 2025-2-18 20:00:22
