[问答题]
A wheel of mass M haa+pjq,f4 5e e3gvz,u fs radius R. It is standing vertically on the flo vs-0hpgyr-8.ej4 n5f beq 5tqor, and we want to exert a horizontal force F at its axle so that it will cl50sr-b-8h. ny qtjf5pe4 gevqimb a step against which it rests (Fig. 8–55). The step has height h, where h
Post time 2025-2-18 20:00:22
