In sci.physics, DaveL
<dave1027@comcast.net>
 wrote
on Tue, 25 May 2004 18:31:07 -0700
<OI6dnSZVjamDbi7d4p2dnA@comcast.com>:

"The Ghost In The Machine" <ewill@aurigae.athghost7038suus.net> wrote in
message news:00ion1-21a.ln1@lexi2.athghost7038suus.net...

We can work either forward or backward.

Forward:  Brute-force a, knowing t and d.  Bear in mind d
is half the distance to the moon (the assumption being that
the lunabus will turn around halfway there and decelerate
at the same rate as it accelerated there in the first place)
and t is 4 minutes.  So we get

a = 3.84 * 10^8 m / (240^2) = 6667 m/s/s

Waaaaaay too much.

If you were really such a physics hot-shot you'd know that if gravity were
use as a method of propulsion then G forces don't apply.

In other words, keep an open mind.

Gravity as a propulsion method might work for such things
as hot air balloons (if only because bouyancy requires it).
I doubt it would work for spacecraft.

DaveL

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#191, ewill3@earthlink.net
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