gc textbook chapter 8 Rotational Motion (id: edef5090c)

[问答题]
A large spool of rope rolls on lx(t); m4mlrd 8-x mqkypzh16 f tf:v)the ground with the end of s:w.1rw idjl nl g534 qfhv,k)ll)l -hthe rope lying on the top edge of the spool. A person gra4wwh ),ll5.:kfg v rs-1l nli lhd3qj)bs 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 far does the spool’s center of mass move?

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