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A.U=0 (kst) by
Ken S. Tucker
Post A.U=0 (kst)
Agreed, A.U=0 always. In components, we have
0 = A.U = A^u U_u == A^0 U_0 + A^i U_i
where i sums over 1,2,3.
I'll choose a CS where all U_i=0, then...
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Question Regarding Hubble Shift by
Robert Karl Stonjek
Hubble Shift Correction
The red shift measured as progressively greater with distance across the
universe is said to be cause by light passing over expanding space. ...
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June 2nd 04
by OC
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positron-electron annhilation by
V ertner Vergon
Somebody made this statement early on in the thread.
"When an electron and positron collide, they radiate two gamma rays,
each
having energy equal to the rest energy of an...
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Dark Matter problems with, by
em
Problem with Dark Matter.
If we are to associate the principle agent in regards to Dark Matter as
pertaining to a class of subatomic particle, then by default we take...
( 1 2)
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June 2nd 04
by em
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Why all the fascination with E = mc^2 ?? by
Leonard Pardin
Even though I slept through most of my highschool physics classes, I
still learned that the formula for Kinetic energy is E = 1/2mv^2. I
also remember that Newton found out...
( 1 2)
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The Right Angle Lever Paradox by
Rohtuaew
The Right Angle Lever Paradox
The "Right Angle Lever Paradox" is a classic construct which is taught in
most courses in Special Relativity. As with all paradoxes,...
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Asymmetry in the twin experiment by
Pentcho Valev
All interpretations of the twin paradox presuppose a setup where there
is a proper distance in the resting twin's frame and no proper
distance in the frame of the traveller....
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test by
Ken S. Tucker
test
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The origin of Einstein's logic by
Pentcho Valev
Einstein has inherited his logic from the thermodynamicists. A little
history:
In the period 1780 - 1790 Lavoisier, Berthollet and other chemists
officially place heat among...
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The Brilliance of Our Teachers by
Slebaliw
The Brilliance of Our Teachers
A recent newspaper question and answer column raised an interesting
subject. The query noted that, for a science course at a local...
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To Dirk Vdm by
Pentcho Valev
Dirk, you have an amazing capacity for linguistic associations. The
moment you read "explosion" you remember a few sites containing the
same word, declare "Ha, this is...
( 1 2)
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