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From: bertietaylor@myyahoo.com (Bertitaylor)
Newsgroups: alt.usage.english,sci.physics
Subject: Re: The antics of thermodynamics, the depravity of relativity, the bunkum
 of quantum
Date: Mon, 31 Mar 2025 03:21:03 +0000
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On Tue, 11 Mar 2025 9:23:15 +0000, Peter Moylan wrote:

> On 11/03/25 15:05, Snidely wrote:
>> Thus spake Peter Moylan:
>>
>>> At the centre of the earth, you also have to taken into account the
>>> radially directed non-gravitational  force that comes from the
>>> weight of all the rocks (and so on) above your head.

Heh-hah
>>
>> Say what?  "non-graviational" from "weight"?

Someone is glimpse how much bogus the academic has to be to be
influential by sucking up to the biases of those who fund them.
>
> Perhaps I should have phrased that better. Consider a hypothetical cave
> explorer at a distance r from the centre of the earth.

If it is a cave it has to be hollow. Experience shows us we get no
pressure from the roof of the cave when we are in it.



The gravitational
> force experienced by that person, i.e. that person's weight, is that due
> to the sphere of radius r below him.

So when r is zero at the core there is no gravitational force from the
sphere of radius zero below them.




The gravitational attraction
> between the person and the earth is not affected by that part of the
> earth at greater radii.


So  one is weightless at the core of the Sun, Earth and planets. Arindam
was taught this school in 1967.
>
> That point is agreed by everyone here.

So where does the pressure come from if there is no force?
>
> However there is another relevant force.

Huh?



The roof of the cave is
> supporting the weight of the material above it. (And it is a weight, so
> I shouldn't have called it non-gravitational. But it's different from
> the weight of the cave explorer.)

Yes it is supporting the weight of material above it just like any arch.
Any dome. The forces are distributed laterally. That is, sideways. Not
down.

As long as the roof doesn't collapse,
> that force doesn't affect the explorer.

And why should it collapse any more than any arch or dome.


Go deep enough, though, and that
> second weight is big enough so that the roof will indeed collapse, so
> our explorer will (very briefly) experience it.

That will happen when the distance is a few tens or hundreds of
kilometers below the surface, Then yes no more caves can happen. Rocks
get crushed, get hot, and melt. A vast sea of molten rock, upon which
tectonic plates float.

Point is that this magma ocean must have a finite depth. For if it
reached the core there would be nothing spherical of radius r to press
against. No force, no pressure at the core to create heat as a result. 
So no lava there, just soild matter, presumably iron and other metals.

The temperature thus drops from the bottom of the magma layer to the
bear absolute zero at the core.

Why does the core not get heated up?  Thousands of kilometers of rock
insulste the heat from the cold core. Then, it is much easier for the
heat to escape out to infinite space.

But a fraction does reach the core. With piezo effect it creates the
vast currents in the superconducting environment near the core to form
magnetic field of Earth/ Sun.

Woof woof woif woof





Deep underground, the
> pressure is so high that no voids can exist. No caves, so no journey to
> the centre of the earth.

From zero force enormous pressure is created! How mysterious.

What fools these professor-apes be!

Woof woof

Bertietaylor

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