gc textbook chapter 8 Rotational Motion (id: edef5090c)

[问答题]
A large spool of rope rolls on the ground with the end of the rope lyins go;3+ vtqu+mha4vu0 g ona hjx +veqi4;:s0qp3g the top edge of the spool. A person grabs the end of the rope and walks a distangs ip 0 aej:4qxq3;h+vce 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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