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What's wrong with CDs? (Posted on 2005-03-30) Difficulty: 3 of 5

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.

Comments: ( You must be logged in to post comments.)
  Subject Author Date
Puzzle AnswerK Sengupta2022-07-23 01:01:21
SolutionTHE CORRECT SOLUTION!kris2005-04-04 16:45:49
Two similaritiesTomM2005-04-02 00:40:09
re: Simpler SolutionCharlie2005-03-31 19:38:11
SolutionSimpler SolutionCeeAnne2005-03-31 19:26:45
re(2): SolutionDustin2005-03-31 01:04:26
re: Solutionasdfjfaadslkfj2005-03-30 23:27:58
An Aside--triviaCharlie2005-03-30 15:53:06
re: SolutionCharlie2005-03-30 15:25:19
SolutionSolutione.g.2005-03-30 14:43:32
Some ThoughtsNon-Calculus Approximation--spoilerCharlie2005-03-30 14:14:46
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