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From: RichD on 4 May 2010 14:35
DougC wrote:
> > When the train is passing the station at high speed and it looks at
> > its clock SR says it will be running slow. But for how long can the
> > station clock be running slow if it is aging faster?
>
> Fundamental but a little hard to detect. Those express trains reach
> the end of the line and turn around for a speedy run the other
> direction. Does that undo the difference in the clock aboard? Or add
> to it?

What about a universe of sufficient mass density, which
eventually ceases expansion, then contracts, a/k/a the Big
Crunch? Does entropy decrease? What will the clocks do?

--
Rich
From: BURT on 4 May 2010 14:59
On May 4, 5:23 am, artful <artful...(a)hotmail.com> wrote:
> On Apr 1, 6:11 am, BURT <macromi...(a)yahoo.com> wrote:
>
> > When the train is passing the station at high speed and it looks at
> > its clock SR says it will be running slow.
>
> The train observer can't tell if the station clock is running fast or
> slow by just looking at that instant.  

Yes it can because passing the station happens in more than an
instant. They will always be able to see the difference in clock rate
over the nonzero interval.

Mitch Raeamsch

> It has to 'look' at the time on
> that clock at different times and see how much time has elapsed on the
> station clock compared to its own
>
> > But for how long can the
> > station clock be running slow
>
> Forever
>
> > if it is aging faster?
>
> It (the station clock) isn't aging faster; it is aging slower
>
> > This is the fundamental clock time contradiction in SR.
>
> There is no contradiction

From: John Murphy on 10 May 2010 21:53
On 2 May, 03:33, BURT <macromi...(a)yahoo.com> wrote:
> If the station will have aged more than the fast moving train how when
> passing the station can the train see the station's clock running
> slow?
>
> Mitch Raemsch

The problem is that the train and the station if in the same universe
must run on separate days, because, if they both ran on the same day
at light speed, they would have converted mass in proportion to their
speed, so that neither would be able to achieve light speed, and, so
neither can achieve light speed on the same day. Even if either
managed to do it, there would be no universe left over for a second
attempt - unless time reversal were possible. With a system of
universal co-ordinates and no mass, they could come and go as they
pleased.

==
Harbinger.
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