Re: Expanding the gedanken

<jt64@xxxxxxxx> wrote in message
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On 1 Apr, 12:39, "Jeckyl" <n...@xxxxxxxxxxx> wrote:
<j...@xxxxxxxx> wrote in message
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From what you describe, they would hit at the same time. But views from
a
different frame of reference the events would not be simultaneous.

No they will not hit at the same time, it has nothing to do with
views, the ship occupy two spaces at the moment physically.

I see nothing from your description of the problem above that would mean
different times for the beams to arrive .. I can't see your original posts
atm (not on my server), so can you please confirm the scenario: A light
source in the middle (equidistant from ends) of a ship, and looking at the
time it would take for light emitted to reach the front and rear ends
relative to the shio's own frame of reference.

So we are assuming they start equidisant from the front and back (ie the
middle), and walk at the same speed (but opposite directions)
Sure we do

OK

The two persons will not reach the wall
at the same moment and place in time and space they will have two
coordinates.
Yes .. the front and back are are different positions.
Yes you state the obvious

Everythings obvious once you know what it is :)

what is not is obvious is how far they
spatially is separated at the moment, let us say the ship is 50 meter

then 50 meters apart from the frame of reference of the ship

and travel at 0.9999

0.9999 what .. I guess you mean 0.9999 c

The speed of the ship makes no difference unless we're looking from some
frame of reference that moves at a different velocity relative to the ship.

BTW: You may also want to specify the speed of the walkers.

This will lead to the conclusion that either the ship
somehow expanded to occupy both positions/cordinates or that the ship
actually occupy two cordinates in any cordinate system.
Eh? .. it just means that the front and the back aren't the same place.
You are very confused

Maybe you've not exaplined the scenario well enough

calculate the spatial separation for the events.

Which events do you mean .. the two wlkaer arriving at the two ends of the
ship .. and if so, wrt which frame of reference?

I don't follow your argument there. And SR relativist would say that the
people arive at the same time (but different places) relative to the
ship.
Is there something I've missed in your description?
Well the places is not separated by the ship length you see they can
be separated by any distance depending on velocity.

No .. the ship length is the ship length wrt the ship. It doesn't matter
how fast it goes relative to something else. Or are you looking at things
from some other frame of reference?

You do go on count on where each light hit each wall
when travelling at 0.9999 c.

Which problem are you talking about .. the walkers or the light in the
centre of the ship?

will get how far spatially separated from eachother the two places/
positions/points is in space.

No i actually think there is something you missed in the description
of SR.

Its your scenario I'm trying to understand. If we are talking about the
frame of reference of the ship, then there is nothing at all 'tricky' going
on .. the two people will start walking in opposite directions at the same
time, each walk half the length of the ship and arrive at the other end at
the same time (and separated by the length of the ship)

If you're not talking about the frame of reference of the ship, then what
are you talking about?


.

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