An old-fashioned (vinyl) record rotates at a constant rate of 45 rpm. If it plays music for 22 min, how far do?
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An old-fashioned (vinyl) record rotates at a constant rate of 45 rpm. If it plays music for 22 min, how far does a point on the edge travel in meters? (Assume the radius of the record is 15 cm.)
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Answer:
You need more info. What is the radius where the needle contacts the record initially? (hint, it's not 15 cm) What is the radius where the needle contacts the record after the 22 minutes? What is the spacing between groves?
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