Re: The velocity of light going pass a moving train.

On Jun 8, 5:41 pm, "Gerald L. O'Barr" <glob...@xxxxxxxxx> wrote:
O'Barr comments:
But we all now know that I was not trying to
say that we were obtaining the real length of
the train as it would be in the ether, I was only
saying that we had to have the true or correct
length of the moving train as measured in the
frame of the tracks.

So let me see if I get what you are saying. Are you saying that the
track frame observer needs to know the rest length of the train in
order to measure closing velocity of light relative to the train?

If so, that isn't the case. In the track frame one only needs to know
the velocity of the train and the velocity of the light. They simply
add +-c-+v. Knowing the rest length isn't necessary. And by the way,
SO WHAT? So according to the track frame the light can close on the
train faster than c or separate faster than c. Thats no big deal.
Light can close or separate slower than c according to the track
frame. That does not change the fact that lightspeed is c according
to coordinate systems of both frames.

And once more the track frame _is not_ special. I keep reminding you
of LET for one simple reason. No frame is special in it. All frames
are indistinguishable from the ether rest frame. Since any frame in
LET is equivalent to the ether rest frame the train frame is
equivalent to the track frame. End of story. Nothing is special
about the track frame.

Allow me to ask you for answer to the following gedanken.

Assume LET. You and I are in a spaceship which moves at .9c wrt the
ether rest frame. We haven't measured this velocity, it is given. So
our clocks are running alot slower than those resting in the ether
rest frame, right? Now you take a trip which first reduces your speed
so that you rest in the ether rest frame. Now you can spend as much
time resting in the ether rest frame as you like. Lets just assume
that you can live for many centuries. Stay as long as you wish
resting in the ether frame aging much faster than me. Then take the
trip back and meet me in the future.

Who will have aged more? Me in the space-ship moving at .9c wrt the
ERF or you who rested in the ERF for as long as you cared to?

.

Relevant Pages

  • Re: The velocity of light going pass a moving train.
    ... in both the train and the track frame. ... In the track frame the beam hits the mirror a little behind the ...
    (sci.physics.relativity)
  • Re: The velocity of light going pass a moving train.
    ... inclined towards the REAR of the car as viewed from the frame of the ... in both the train and the track frame. ... In the track frame the beam hits the mirror a little behind the ...
    (sci.physics.relativity)
  • Re: The velocity of light going pass a moving train.
    ... in both the train and the track frame. ... Your mistake there is failing to recognise that these two angles (and ...
    (sci.physics.relativity)
  • Re: The relativity of simultaneity
    ... which the train is moving) will reach the passenger before flash A. ... Closing velocities as perceived by the track observer ... light from different directions in the M' frame is isotropic. ... the two light rays arriving to him simultaneously by definition of the ...
    (sci.physics.relativity)
  • Re: The relativity of simultaneity
    ... which the train is moving) will reach the passenger before flash A. ... Closing velocities as perceived by the track observer ... light from different directions in the M' frame is isotropic. ... the two light rays arriving to him simultaneously by definition of the ...
    (sci.physics.relativity)