A string is wrapped severaltimes around the rim of a small hoopwith radius 8.00 cm and mass 0.180 kg.The free end of the string is held inplace and the hoop is released from rest. After the hoop hasdescended75.0 cm, calculate (a) theangular speed of the rotating hoop and(b) the speed of its center.

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Q: rolls

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Q: glass

A: Mass = volume ×density