perplexus.info :: Calculus : What's wrong with CDs?

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?

See The Solution Submitted by Erik O.

Rating: 4.0000 (1 votes)

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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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