[问答题]
A large spool of rope 7r wwlxa; dmmej1jd ),)+p.ny rolls on the gro f:xkzum4 a ii 7tgb5gxt/d c+w-/1z6jund with the end of the rope lying on the top edge of the spool. A person grabs the end of the rope and walks a distance wx4z k/i5figx d cmt/6t:1z+u -bajg7L, holding onto it, Fig. 8–50. The spool rolls behind the person without 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
