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Moon Experiment (Posted on 2004-11-22) Difficulty: 5 of 5
Assume the moon is a perfect sphere and a straight tunnel has been drilled through the center. How long would it take a 1kg ball dropped from one end of the tunnel to reach the center? Ignore all resistances.

If a second 1kg ball is dropped 10 seconds after the first one, when and where in the tunnel would they first meet?

Idealized Moon Stats:
- Diameter: 3480 kilometers
- Mass: 7.38x10^22 kilograms (uniform density)

See The Solution Submitted by Brian Smith    
Rating: 2.4000 (5 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): Completely Analytical Solution (Physics + Differential Calculus) | Comment 13 of 22 |
(In reply to re: Completely Analytical Solution (Physics + Differential Calculus) by Charlie)

Aha!  And there it is.   I should have never doubted Charlie, for which I humbly apologize.   Once again, the old "off by a factor of 2^(2/3) trick". 
  Posted by Larry on 2004-11-23 05:53:02

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