[问答题]
A wheel of mass M has radihw+ ke 273wjuys2jx-*fq;.noxzeii 48mu p 4zus R. Itt4da2b (ap0wwl yoz0:c+jic 6 is standing vertically on the floor, and we want to exert a horizontal force F at its axle b+6 lc4wp2j y: io dtaac(zw00so that it will climb a step against which it rests (Fig. 8–55). The step has height h, where h