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*> > > Spike Jones wrote:
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*> > >
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*> > > > Nowthen, since we are talking about frictionless evacuated tunnels...
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Well, Ill be damned. I found a density gradient estimate for the

earth, and did a calculation on Damien's train on a frictionless

evacuated tunnel thru the earth idea. I calculated something

that surprised me. Using the density gradient found at

http://www.tulane.edu/~sanelson/geol212/earths_interior_.htm

I calculated that the maximum gravity felt by the passengers

is actually slightly higher than 1 g. Or another way to say it

is if you dug a hole straight down the gravity felt by the digger

gradually increases to about 11.7 m/sec^2 or almost 1.2 G

at a depth of about 2900 km, then decreases after that, if

one could keep digging. Anyone know of another paper

or website which has calculated a different value? spike

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