Re: Abiotic oil

On Mon, 18 Aug 2008 17:57:28 -0400, Wes <clutch@xxxxxxxxx> wrote:

Marv <invalid@xxxxxxxx> wrote:

Which is a consequence of an even weirder fact - a mass inside a
uniform sphere of finite thickness will experience no net attractive
force from the sphere. Gravity decreases linearly as you penetrate
into the earth.

Hi Marv,

I got the center of the earth thing as soon as it was pointed out. I don't seem to be
able to grok your paragraph above.

Btw, you the Marv with all the neat metalworking programs? If so, thanks for putting that
stuff out. Still have not got around to porting to my palm pda. Sure would like to move
the gage block stack one first.

Wes

A point mass inside a spherical shell will experience no net force
from the shell, regardless of its location within the shell. All the
gravitational forces from the shell material balance out perfectly at
every location so the net force on the particle is zero. Thus, if
you're inside the earth, the only part of the mass that exerts a force
on you is the mass between you and the center of the earth - you can
ignore the mass in the shell above you. So, as you penetrate deeper,
the gravitational attraction you experience declines linearly from its
value at the surface, eventually reaching zero at the center.

And, yes, I'm that "Marv". Glad you like the programs. They include
the source code so it shouldn't be too hard to port to other devices.

Regards, Marv

Home Shop Freeware - Tools for People Who Build Things
http://www.myvirtualnetwork.com/mklotz
.

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