[问答题]
A large spool of rope roll;f2r c4h.btzzs on the ground with the end of the rope lq; sd bdgn76vt: s0r*xying on 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 without slipping. What length of rope unwinds from the spool? How fans;gx0ddt6 qb7*r :sv r does the spool’s center of mass move?
Post time 2025-2-18 20:00:22
