[问答题]
A wheel of mass M has ra88m jtj-)f6dsr)*bn p ;di xyhsrn0+hdius R. It is standing vertically on the floor, an*iforvr /s5qwutr22 1b7g clm050s ;mg7q t yfd we want to exert a horizontal force F at its axle so that it will climb a step against which it restsf cftqm 0wmq05t7yors1gv/l2*si u7 r2g;br5 (Fig. 8–55). The step has height h, where h
Post time 2025-2-18 20:00:22
