| Topic: |
Science > Physics |
| User: |
"Nils Dalen" |
| Date: |
22 Aug 2003 11:46:48 AM |
| Object: |
Re: Top 10 things I've learned reading sci.phys |
(Patrick Reany) wrote in message news:<844a1b64.0308191321.68e2038d@posting.google.com>...
Unstable Al loves to come into a thread at the number 2 position, as
though nothing more ever need be said in that thread. But of course
he's wrong. Plenty has to be said to undo the damage of the
misconceptions he daggled in his usually valueless posts. If unabashed
Al could only treat posters on sci NGs with same respect that he is
forced to treat them on sci.physics.research then he could be of use,
rather than a hideous embarrassment to science. The terrible image he
projects of a bigoted, egomaniac, and dogmatic scientist should be
appalling to every sincere poster. I can't understand why any of you
tolerate him at all.
There is a good example of a role reversal for Uncle Al over in
sci.physics.research now. He posted a "gee whiz, look at this paper"
post. The number two post came in with the depth of knowledge in the
subject that Al can only dream of.
Uncle Al has to be more polite in that forum. Not only is it
moderated, but he would be spanked pretty hard by people who actually
know gravity if he tried some of the crap he gets away with here.
Since there is the existance proof that Al can behave in a discussion,
it makes him all the less tolerable (if that is possible) here.
An interesting little bit from that thread--Uncle Al made the
(trivial) mistake of mispelling an Author's name in his post. When
the no.2 person corrected him, Al tried to imply that it was a problem
with arXiv.org. His desire to be always correct borders on the
pathological.
Nils
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| User: "Jim" |
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| Title: Re: Top 10 things I've learned reading sci.phys |
22 Aug 2003 09:10:41 PM |
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Bill Vajk <bill9north@hotmailDITCHTHIS.com> wrote:
Nils Dalen wrote:
An interesting little bit from that thread--Uncle Al made the
(trivial) mistake of mispelling an Author's name in his post. When
the no.2 person corrected him, Al tried to imply that it was a problem
with arXiv.org. His desire to be always correct borders on the
pathological.
IMO it goes beyond a need for correctness while belonging
more to the Naopleanic "top dog" genre.
If only he were as foible free as we.
Jim
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| User: "tj Frazir" |
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| Title: Re: Top 10 things I've learned reading sci.phys |
23 Aug 2003 01:54:00 PM |
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I wounder if any of you know ten things ?
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| User: "ZZBunker" |
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| Title: Re: Top 10 things I've learned reading sci.phys |
24 Aug 2003 07:15:27 AM |
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(tj Frazir) wrote in message news:<24652-3F47B848-98@storefull-2154.public.lawson.webtv.net>...
I wounder if any of you know ten things ?
Most of us know 11 things.
Ten things about physics.
And one thing about idiot Cosmologists.
But since that one thing keeps changing,
it's usually called meta-cosmological
page-swapping rather than astronomy.
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| User: "Jim" |
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| Title: Re: Top 10 things I've learned reading sci.phys |
23 Aug 2003 04:30:42 PM |
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(tj Frazir) wrote:
I wounder if any of you know ten things ?
You are so silly. :)
Jim
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| User: "The Ghost In The Machine" |
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| Title: Re: Top 10 things I've learned reading sci.phys |
23 Aug 2003 07:00:10 PM |
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In sci.physics, tj Frazir
<GravityPhysics@webtv.net>
wrote
on Sat, 23 Aug 2003 14:54:00 -0400 (EDT)
<24652-3F47B848-98@storefull-2154.public.lawson.webtv.net>:
I wounder if any of you know ten things ?
1. George W. Bush is the President of the United States.
2. Our military is in Iraq, and being shot at. Saddam
has been successfully deposed but is still at large.
3. Linux is a wonderful operating system, much better than
Windows XP.
4. Women are sexy. (OK, so I'm male, The women probably
would say men are sexy. We're both right. :-) )
5. Elvis is dead, and as far as we know it *was* just
a weather balloon.
6. California is going through a recall election for the
first time in more than a century...
*psst...sci.PHYSICS*
Oh. Uh, erm, ahh, right. *shuffles notes*
1. Light in vacuum travels at a constant speed no matter who
observes it, or under what conditions.
2. GPS depends on various SR and GR corrections to function normally.
3. Cesium-ion beam clocks tick irregularly because of QM effects
(though not nearly so much as, say, a Chinese water clock!).
4. T^2 = R^3, when describing orbits. (Kepler)
5. The sun uses the pp cycle, not the CNO cycle, to generate energy
from helium. Sometime later it will bloat up and swallow
Venus and possibly the Earth as well, but we will have long
since left -- or gotten fried -- because its output will
have increased beyond what I will call the "life band": the
oceans will have long since boiled off. Venus II: The
Earth Destroyed. However, the Sun will not generate a black
hole or a supernova; it's not massive enough. (See #29.)
6. Two variants of an Fe-57 experiment exist; one described by
Frodo Morris, and another described as "the Harvard Tower"
in http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/gratim.html .
Both show results consistent with SR and GR.
7. It would take about 80 seconds and 320 km minimum to accelerate
a human to escape velocity from a standing start, at a punishing
100 m/s/s (~ 10g). (OK, so this is my own computation. But
it counts. :-) )
8. Information cannot travel faster than light, except during
certain somewhat controversial experiments where light tunnels
through some sort of quantum gap. (The signal going through
is uselessly weak.)
9. Voltage is pressure; amps is flow rate of electrons.
10. The universal AC motor does not depend on permanent magnets
or brushes, but on a rotating magnetic field. Such units
can be integrated into compressor units, and hermetically
sealed.
11. F = ma. Inertia is not a measurement, but a concept;
mass *is* a measurement *and* a concept.
12. It is possible for atoms to form, at extremely low temperatures,
a strange form of matter known as a "Bose-Einstein" condensate.
13. A hard drive gets warm not because of bearing wear
but because the gas inside (probably air but it could
be pure nitrogen) generates friction as the unit
rotates. Getting rid of the gas inside is possible
but would make the unit very difficult to engineer
and almost useless to most applications, as the head
"fly" across the surface not unlike an airplane wing,
with a built-in cushioning effect.
14. Cherenkov radiation is because of electrons going faster than
the speed of light in a transparent medium. (This is not
to be confused with the speed of light in vacuo.)
15. It is possible to refrigerate using nothing but a burning flame,
piping, an expansion valve, and the proper working fluid(s).
However, the unit is gravity-dependent.
16. An atomic fountain clock does in fact depend on a
fountain of atoms, and requires gravity to operate.
17. E = -GmM/R. F = -GmM/R^2.
18. The lack of any results from the Michelson-Morley experiment
proves the Lorentz contraction, and/or the lack of any sort
of rigid luminiferous aether.
19. The Earth is moving at just about 1/10,000 the speed of light
around the Sun.
20. Certain posters here don't believe in GR or SR, despite
no experiment ever having shown results inconsistent
with either theory. (For reasons of diplomacy I won't
name names.)
21. Half-life is the amount of time it takes half of a
radioactive material to decay away. (OK, so I knew
that before coming here. :-P :-) )
22. Power lines sag when carrying power, and the voltage used
on such lines should be as high as possible. (Both should
have been obvious, in retrospect. After all, hot stuff
expands, and current generates heat. The day was also
nice and warm as well, which probably didn't help, both
because that would make the lines longer anyway, and
because of the increased power load as people cranked on
the A/C.)
23. The Navy uses 400 Hz power in some of its equipment.
24. A spacecraft has to come in at about a 2 degree angle
in order to successfully reenter the Earth's atmosphere.
Too shallow, it bounces off, not unlike a rock skipping
on a river or lake. Too steep, it burns up.
25. Liquid air can be created using a compressor, artfully
crafted glass tubing, a chamber, a needle valve,
and a Dewar flask.
26. Atoms can get excited by light quanta, and emit light
quanta to get back to ground state. If done right,
the light quanta can be generated in a coherent
fashion, yielding a highly coherent beam (a LASER beam:
Light Amplification by Stimulated Emission of Radiation).
27. A block of ice orbiting the Earth, if forced to deorbit,
would have enough energy to create high-pressure steam
when reaching the Earth's surface -- if it ever gets there.
(Another computation by yours truly, but it's a simple one.)
28. There is a planet out there with an atmosphere hot enough
to vaporize iron, presumably with iron clouds.
29. A star about 1.44 times the mass of our Sun will
create a black hole.
30. A standard D cell contains 16500 mAh, or 59.4 kJ, and
can store as much or more energy at 1.5 V than an
equivalently sized "supercapacitor" at the same voltage.
There, that should be enough. :-)
--
#191,
It's still legal to go .sigless.
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| User: "Sam Wormley" |
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| Title: Re: Top 10 things I've learned reading sci.phys |
23 Aug 2003 07:47:22 PM |
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to vaporize iron, presumably with iron clouds.
29. A star about 1.44 times the mass of our Sun will
create a black hole.
If the star is a white dwarf (degenerate) and reaches 1.44 solar masses
one observes a Type Ia supernova that completely blows itself apart with
no remnant. A 1.44 iron core in an evolving star can collapse to form
a neutron star... and a Type II supernova.
A collapsing stellar core probably has to have 2.9-3.0 solar masses or
more to form a black hole...
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| User: "The Ghost In The Machine" |
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| Title: Re: Top 10 things I've learned reading sci.phys |
24 Aug 2003 03:00:15 AM |
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In sci.physics, Sam Wormley
<swormley1@mchsi.com>
wrote
on Sun, 24 Aug 2003 00:47:22 GMT
<3F480B0F.D10999F1@mchsi.com>:
to vaporize iron, presumably with iron clouds.
29. A star about 1.44 times the mass of our Sun will
create a black hole.
If the star is a white dwarf (degenerate) and reaches 1.44 solar masses
one observes a Type Ia supernova that completely blows itself apart with
no remnant. A 1.44 iron core in an evolving star can collapse to form
a neutron star... and a Type II supernova.
A collapsing stellar core probably has to have 2.9-3.0 solar masses or
more to form a black hole...
Fair enough. I'll admit to not being an astronomist.
So far, that's 27 left. :-)
--
#191,
It's still legal to go .sigless.
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| User: "The Ghost In The Machine" |
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| Title: Re: Top 10 things I've learned reading sci.phys |
24 Aug 2003 03:00:14 AM |
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In sci.physics, Bill Vajk
<bill9north@hotmailDITCHTHIS.com>
wrote
on Sun, 24 Aug 2003 00:34:03 GMT
<3F4807D6.30104@hotmailDITCHTHIS.com>:
The Ghost In The Machine wrote:
10. The universal AC motor does not depend on permanent magnets
or brushes, but on a rotating magnetic field. Such units
can be integrated into compressor units, and hermetically
sealed.
Uh, no. The magnetic field reverses, not rotates, and still
requires brushes which remain a no no in the given environment.
Hm...perhaps I have the wrong motor, then. :-) I'll have to
look that one up. I'm not all that up on motor theory.
15. It is possible to refrigerate using nothing but a burning flame,
piping, an expansion valve, and the proper working fluid(s).
However, the unit is gravity-dependent.
Actually the process doesn't depend on expansion the way
that mechanical compression refrigeration systems do. There's
a general knowledge level historical description (probably
worth reading) at: http://www.robur.com/Company/Tech.html
Someone mentioned it in another post; that's all I really know
about it. It's an interesting method of refrigeration.
There, that should be enough. :-)
How could you????? You forgot to discuss aether!
I might have mentioned it in the Michelson-Morley experiment.
I didn't discuss sprites and goblins either. :-)
--
#191,
It's still legal to go .sigless.
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| User: "Tom Potter" |
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| Title: Re: Top 10 things I've learned reading sci.phys |
29 Aug 2003 01:06:44 AM |
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"The Ghost In The Machine" <ewill@sirius.athghost7038suus.net> wrote in
message news:ci3m11-294.ln1@lexi2.athghost7038suus.net...
In sci.physics, Bill Vajk
<bill9north@hotmailDITCHTHIS.com>
wrote
on Sun, 24 Aug 2003 00:34:03 GMT
<3F4807D6.30104@hotmailDITCHTHIS.com>:
The Ghost In The Machine wrote:
10. The universal AC motor does not depend on permanent magnets
or brushes, but on a rotating magnetic field. Such units
can be integrated into compressor units, and hermetically
sealed.
Uh, no. The magnetic field reverses, not rotates, and still
requires brushes which remain a no no in the given environment.
Hm...perhaps I have the wrong motor, then. :-) I'll have to
look that one up. I'm not all that up on motor theory.
Well, it has been over 40 years since I taught
AC and DC motors and generators,
and I don't remember the details,
but you were right in the first place.
Motors require a "rotating magnetic field"
to get started and to run, and all kinds of tricks,
like "start capacitors" and "shaded poles",
are used to offset the phase to get AC motors started.
Once an AC motor gets started, it gets synchronized with
the field, and the load on the armature causes a lag
in the armature field, and this, with
If you don't get the armature/field fields offset and rotating,
the armature just sits there and heats up.
And all motors do not require brushes or commutators.
--
Tom Potter http://tompotter.us
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| User: "The Ghost In The Machine" |
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| Title: Re: Top 10 things I've learned reading sci.phys |
29 Aug 2003 11:00:11 AM |
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In sci.physics, Tom Potter
<tdp@hotsheet.com>
wrote
on Fri, 29 Aug 2003 14:06:44 +0800
<bimq9o$avet7$1@ID-188019.news.uni-berlin.de>:
"The Ghost In The Machine" <ewill@sirius.athghost7038suus.net> wrote in
message news:ci3m11-294.ln1@lexi2.athghost7038suus.net...
In sci.physics, Bill Vajk
<bill9north@hotmailDITCHTHIS.com>
wrote
on Sun, 24 Aug 2003 00:34:03 GMT
<3F4807D6.30104@hotmailDITCHTHIS.com>:
The Ghost In The Machine wrote:
10. The universal AC motor does not depend on permanent magnets
or brushes, but on a rotating magnetic field. Such units
can be integrated into compressor units, and hermetically
sealed.
Uh, no. The magnetic field reverses, not rotates, and still
requires brushes which remain a no no in the given environment.
Hm...perhaps I have the wrong motor, then. :-) I'll have to
look that one up. I'm not all that up on motor theory.
Well, it has been over 40 years since I taught
AC and DC motors and generators,
and I don't remember the details,
but you were right in the first place.
Motors require a "rotating magnetic field"
to get started and to run, and all kinds of tricks,
like "start capacitors" and "shaded poles",
are used to offset the phase to get AC motors started.
Once an AC motor gets started, it gets synchronized with
the field, and the load on the armature causes a lag
in the armature field, and this, with
If you don't get the armature/field fields offset and rotating,
the armature just sits there and heats up.
And all motors do not require brushes or commutators.
DC motors do. :-) That's one reason we're using AC today
(the other is the transformer). That much I know.
[.sigsnip]
--
#191,
It's still legal to go .sigless.
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| User: "Bill Vajk" |
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| Title: Re: Top 10 things I've learned reading sci.phys |
23 Aug 2003 02:53:34 PM |
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tj Frazir wrote:
I wounder if any of you know ten things ?
Well that's one thing (among many others) you don't know.
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