[问答题]
A large spool of rope rolls on the grou aizi :8eikg6,1 t*5x jzh/w 0gjgf+iind with the end of the rope lying w+( ; *gbdyh,mn2b fmuon the top edge of the spool. A person grabs the end of the rope and walks a distance L, holding onto it, Fig. 8–50. The spool rolls behind the person wityu;b(,g +md *nbwhf2m hout slipping. What length of rope unwinds from the spool? How far does the spool’s center of mass move?
Post time 2025-2-18 20:00:22
