"Pentcho Valev" wrote in message
...
Theoretically, the null result of the Michelson-Morley experiment can
be obtained by assuming that:

(A) The speed of light varies with the speed of the light source (c'=c
+v); the principle of relativity is correct; there are no miracles
(length contraction, time dilation).

(B) Einstein's 1905 light postulate (c'=c) is correct; the principle
of relativity is correct; there are miracles (length contraction, time
dilation).

There is no reasonable third alternative. That is, Newton's emission
theory of light with its constitutive equation c'=c+v is the ONLY
alternative to special relativity. Moreover, the emission theory is
TRUE and special relativity FALSE unless one finds natural that a
long train can be trapped inside a short tunnel, an 80m long pole can
be trapped inside a 40m long barn

...in the sense described below it can be..

and a bug can be both dead and
alive:

The bug can't be both dead and alive (quantum effects aside!), so if the
article below is claiming this it is wrong...


http://www.youtube.com/watch?v=VSRIy...related&search

http://math.ucr.edu/home/baez/physic...barn_pole.html
"These are the props. You own a barn, 40m long, with automatic doors
at either end, that can be opened and closed simultaneously by a
switch. You also have a pole, 80m long, which of course won't fit in
the barn. Now someone takes the pole and tries to run (at nearly the
speed of light) through the barn with the pole horizontal. Special
Relativity (SR) says that a moving object is contracted in the
direction of motion: this is called the Lorentz Contraction. So, if
the pole is set in motion lengthwise, then it will contract in the
reference frame of a stationary observer.....So, as the pole passes
through the barn, there is an instant when it is completely within the
barn. At that instant, you close both doors simultaneously, with your
switch. Of course, you open them again pretty quickly, but at least
momentarily you had the contracted pole shut up in your barn. The
runner emerges from the far door unscathed.....If the doors are kept
shut the rod will obviously smash into the barn door at one end. If
the door withstands this the leading end of the rod will come to rest
in the frame of reference of the stationary observer. There can be no
such thing as a rigid rod in relativity so the trailing end will not
stop immediately and the rod will be compressed beyond the amount it
was Lorentz contracted. If it does not explode under the strain and it
is sufficiently elastic it will come to rest and start to spring back
to its natural shape but since it is too big for the barn the other
end is now going to crash into the back door and the rod will be
trapped in a compressed state inside the barn."

...so no problem from either the barn owner's perspective or the runner's
perspective. Or are you claiming there is some internal contradiction in
the scenario?


http://hyperphysics.phy-astr.gsu.edu.../bugrivet.html
"The bug-rivet paradox is a variation on the twin paradox and is
similar to the pole-barn paradox.....The end of the rivet hits the
bottom of the hole before the head of the rivet hits the wall. So it
looks like the bug is squashed.....All this is nonsense from the bug's
point of view. The rivet head hits the wall when the rivet end is just
0.35 cm down in the hole! The rivet doesn't get close to the
bug....The paradox is not resolved."

Maybe the author of the article does not know how to resolve this, but it
seems to me just another variation of the pole-barn paradox - you need to be
careful that the order of events in the two frames are going to be
different. (The events being the squashing of the bug and the rivet head
hitting the wall. Yes - I'm sorry to have to tell you that the bug gets
squashed and will be "dead", not "both dead and alive" as you seem to think!
:-)

Mike.


Pentcho Valev