(TFT) Mark's thoughts on cidri physics.

[Rick Smith <rsmith@lightspeed.ca>]

On Mon, 2006-02-06 at 09:44, Mark Tapley wrote:
> See above. For a qualitative proof, try this. For a spherical shell, 
> we are trying to calculate acceleration due to gravitational 
> attraction to the mass of the shell at at arbitrary point inside the 
> shell.
> 
> Draw a line containing the arbitrary point and the center of the 
> shell. Because everything is circularly symmetric about that line, 
> any acceleration has to be right along that line, one direction or 
> the other. ...

Nicely argued Mark.  Strangely enough I had 
almost exactly this same argument with a SF
fan 8 or 9 months ago.

You brought up a lot of points I felt I 
should go into, but didn't really have time
for.  Many thanks.

Rick
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