gc textbook chapter 8 Rotational Motion (id: edef5090c)

[问答题]
A large spool of rope roll ,zet,9wq/ 5zb bi0iams on the grouns o *wx1.i*fvid 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 L, holding onto it, Fig. 8–50. The spool rolls behind the person without slipping. What length of rope unwinds from thif xw. vi*1so*e spool? How far does the spool’s center of mass move?

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