[问答题]
A wheel of mass M has radius R. xk.q:wx ,3kw6lru9 bgIt is sta22f b)ykgiqjbo,+1jakg r90jmy - d6anding vertically on the floor, and we want to exert a horizontal force F at its axle skdgy60b9b,jg2+jafar k i) q2o-mj 1 yo that it will climb a step against which it rests (Fig. 8–55). The step has height h, where h
Post time 2025-2-18 20:00:22
