The Ping-Pong Ball and The Sun / S D Rodrian

On Thu, 8 Oct 2009 11:15:07 +0100, Alan LeHun
wrote:

In article 1c14d5b0-1d87-407c-9dc9-
, says...
However, current theory says that the center
of the Sun (of every star) is the place where
the greatest amount of pressure exists. In
fact: It is at the center of every star that the
fusion that keeps a star "going" is taking
place--exactly because this is the region of
the highest amount of gravitational pressures!


Yes. This may well be due to the sun being made, not of magic ping-pong
balls, but of normal matter which, unlike said magic ping-pong balls,
are affected by forces other than gravity.

You are however, correct in surmising that gravitational forces in the
center of stars are negligible.

Or any other spherical body, for that matter. For a hollow
sphere, the gravition is zero anywhere within the hollow.

--
************* DAVE HATUNEN ) *************
* Tucson Arizona, out where the cacti grow *
* My typos & mispellings are intentional copyright traps *

B, net != gross. Learn vector arithmetic.

The instant Superman plunges past the
surface of the Sun, he will feel the pull
of the Sun's gravity begin to decrease.
And it will continue to decrease as he
flies towards the Sun's center.

[This is because as Superman travels
closer and closer to the center of the
Sun: the amount of Sun mass pulling
on him is decreasing, all the time that
there will be a growing amount of Sun-
mass behind him pulling back on his
super body. We can set aside the Sun
mass to the sides, but we must still
subtract it from the "pulling" mass.]


Incorrect. Whilst the amount of "Sun mass" pulling on him decreases, so does
his distance from the centre of the Sun which causes the force of gravity to
increase (by a factor proportional to 1/r^2).

The gravity could increase or decrease as superman flew towards the centre
of the Sun; my guess is that it would increase but without calculating it I
wouldn't really know.

Making basic mistakes like this really just indicates that you have not even
the most basic understanding of physics, and hence its not worth reading to
the end of your post.

In alt.sci.physics.new-theories Aardvark wrote:
Obviously the ping-pong ball overwhelmed
the fragile minds of many of the posters
here (I only used it as strictly a focusing
device, but far far too many poor souls here
were simply dumbfounded by a ping-pong
ball inside the Sun and wrecked their brains
over how it was reacting in there). And
this in spite of my warning then that if they
didn't have a mind they ought not try to
work their way through my [sic.] "mind"
experiment. Forget the ping-pong ball guys:
I only chose it, instead of a golf ball, say,
because it (too) most ironically is hollow.

You seem to be attempting to describe a variation of a classical thought
experiment. Imagine a tunnel drilled through the earth, directly through
the centre (assume all the technology to permit this exists.) The tunnel is
then evacuated to reduce friction to zero. What happens to an object that
is dropped into the tunnel?

The object has mass and inerta and will accellerate due to gravity. All the
time the object falls down the tunnel, there is more mass ahead than behind
so there is always an attractive force and the object accellerates. When the
object reaches the centre of the earth its speed is a maximum and due to
inerta it will just keep on going. Now, there is always more mass behind
the object and it will start to slow down, but the experiment is symmetrical
and the object will just reach the surface at the other end of the tunnel.
Whereupon, it will oscillate back and forth. It helps to know that
gravitation in a spherical body is linearly dependent on the distance from
the centre (not the square law observed outside the body.)

The Sun is no different.

--
Don't believe in God? You are not alone. FreeThoughtAction.org

Aardvark wrote:
[snip crap]

Superman and The Sun Experiment.
[snip 600 lines of crap]


It was not until around Einstein's time that
astrophysicists would at last able to put together
a cohesive theory of how the Sun is able to
ignite and sustain a self-perpetuating fusion
furnace
[snip all furthr crap]

Physical Review 73(7) 803 (1948)

idiot

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2

On Oct 10, 2:35 am, "Peter Webb"
wrote:
The instant Superman plunges past the
surface of the Sun, he will feel the pull
of the Sun's gravity begin to decrease.
And it will continue to decrease as he
flies towards the Sun's center.

[This is because as Superman travels
closer and closer to the center of the
Sun: the amount of Sun mass pulling
on him is decreasing, all the time that
there will be a growing amount of Sun-
mass behind him pulling back on his
super body. We can set aside the Sun
mass to the sides, but we must still
subtract it from the "pulling" mass.]

Incorrect. Whilst the amount of "Sun mass"
pulling on him decreases, so does
his distance from the centre of the Sun
which causes the force of gravity to
increase (by a factor proportional to 1/r^2).

Do you even read what you're typing?
What you have just said is that "while he
is getting closer to the center of the Sun
his distance from the center of the Sun
decreases!" Your thinking processes may be
impaired, perhaps by alcohol (speculation).

I don't believe it is worth wasting time trying
to make you "see" that as he travels closer to
the center of he Sun the amount of mass "pulling
on him" is always decreasing--And how a
decreasing amount of mass can increase the
pull of gravity is something like expecting a
pebble resting on the surface of the earth to
suddenly fly off into space on its own!

Sir, think before you speak. And certainly THINK
before you type. And then please re-read it and
re-read it again. You'll come across much better.
AND if you're drunk, by all means give your
typing mechanism to a friend.

The gravity could increase or decrease as
superman flew towards the centre
of the Sun; my guess is that it would
increase but without calculating it I
wouldn't really know.

Don't bother calculating. Just close your eyes
and imagine yourself at the center of the Sun,
the Earth, of any other celestial body: All
around you there is an equal amount of mass
pulling at you. Now, which way would you be
"pulled" and how strongly? THINK. All you
need to do is THINK.

Making basic mistakes like this really just
indicates that you have not even
the most basic understanding of physics,
and hence its not worth reading to
the end of your post.

I am strangely satisfied that you do not have
the curiosity to read the rest of my post. It
tells me that I have forged the right path when
someone as lost in this world as you decides
to wander off in some crazy direction.

Thank you, I appreciate it:

S D Rodrian
http://sdrodrian
http://physics.sdrodrian.com
http://mp3.sdrodrian.com


..

On Oct 10, 3:09 pm, Uncle Al sputtered:
Aardvark wrote:
[snip crap]
Superman and The Sun Experiment.
[snip 600 lines of crap]

Jeepers, Al, you sure do have a lot
of crap on your mind--You definitely
need a mental laxative!

It was not until around Einstein's time that
astrophysicists would at last able to put together
a cohesive theory of how the Sun is able to
ignite and sustain a self-perpetuating fusion
furnace

[snip all furthr crap]
Physical Review 73(7) 803 (1948)
idiot

Dear idiot:

Albert Einstein
Born: 14th of March, 1879
Died: 18th of April, 1955

S D Rodrian
http://sdrodrian
http://physics.sdrodrian.com
http://mp3.sdrodrian.com


..

In article ,
Aardvark wrote:

Superman and The Sun Experiment.

Is there one Superman in this experiment or two?

Now: Imagine Superman approaching
the surface of the Sun.

Oh, for Christ's sake.

You persist in complicating your argument. You don't need
a ping pong ball (or two) or Superman or anything else.

Your position is that since there is no gravitational force
at the center of the sun then there should be nothing there
at all. A big, empty hollow. Presumably because, with not
gravity, there is nothing to hold things there so things will
tend to leave. That's wrong. There will be no gravity to
hold things in place, but there will certainly be hydrostatic
pressure and that's going to be more than sufficient.

Where does the pressure come from if there is no gravity, you
ask? There's no gravitational force at the exact center, but
most of the mass is somewhere else and it is all feeling a force
towards the center. That's where the pressure comes from.

That's all. You spend so much time trying to be cute you can't
even be bothered to learn anything.

Alan
--
Defendit numerus

On Oct 8, 3:26*am, Aardvark wrote:
On Oct 8, 3:11 am, "Peter Webb" wrote:
SDR wrote:
*[When it is at the Sun's surface,
*the pull of the Sun's gravity on
*the ping-pong ball will be at its
*maximum.]
The instant the ping-pong ball plunges
past the surface of the Sun, the pull of
the Sun's gravity on the ping-pong ball
will begin to decrease.
It is always true if the body has constant
density, but the Sun doesn't.

Another Pinocchio explanation required.

You also missed the fact that the highest
gravitational pull "down" is NOT at the
surface of a sphere but a little bit up from
it (since at the surface part of that pull
will be defrayed from the sphere's sides).

Where is the strongest tug over Earth?

Gravital pressure goes into elèctric pressure. End of spell.

data says - data say

-Aut