Chien Ting Chin (
Mon, 23 Aug 1999 20:26:09 -0400 (EDT)

On Sat, 21 Aug 1999, -Z- wrote:
> Each colony is 32km (20 miles) long and 6.4km (4 miles) in diameter. But
> elevations. The concrete and titanium hull is only a meter thick. The

So that makes 32e3 * 6.4e3 * pi * 1 = 643 million m^3 of stuff.

Specific gravity of titanium is 4.54, concrete is probably lighter, so I
will be conservative and use 2. That's 1.3e12 kg, or 1.3 million million
kg being drop on your head.

Escape velocity of earth is something like 11 m/sec (right?), so
  E = (1/2) m V^2 You have 7.7e13 J. Now for the life of me, I can't
remember or find out how many J there is to the Megaton, so I do some
searching to try to figure it out. The heat of combustion for TNT is 821
"kg calories per gram molecular weight", I have no idea what that really
means, if it's 821 calories per gram, than it's 3.4e15 J per Megaton.

Hmm so a colony drop is conservative only 0.02 Megaton or 22 kiloton. Hmm
how big was Hiroshima again? About the same?

CHIN, Chien Ting
Dept of Medical Biophysics, Sunnybrook Health Science Centre
... o O *
Man is a bubble

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