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 What's wrong with CDs? (Posted on 2005-03-30)

The diameter of a long playing vinyl record is 12 inches. The unused center has a diameter of 4 inches, and there is a smooth outer edge that is 1 inch wide. If there are 91 grooves to the inch, how far does the needle travel within the groove during playback of the record?

 Submitted by Erik O. Rating: 4.0000 (1 votes) Solution: (Hide) Charlie and CeeAnne provide two ways of coming to the result of approximately 6003.6 inches here and here.

 Subject Author Date Puzzle Answer K Sengupta 2022-07-23 01:01:21 THE CORRECT SOLUTION! kris 2005-04-04 16:45:49 Two similarities TomM 2005-04-02 00:40:09 re: Simpler Solution Charlie 2005-03-31 19:38:11 Simpler Solution CeeAnne 2005-03-31 19:26:45 re(2): Solution Dustin 2005-03-31 01:04:26 re: Solution asdfjfaadslkfj 2005-03-30 23:27:58 An Aside--trivia Charlie 2005-03-30 15:53:06 re: Solution Charlie 2005-03-30 15:25:19 Solution e.g. 2005-03-30 14:43:32 Non-Calculus Approximation--spoiler Charlie 2005-03-30 14:14:46

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