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Old February 1st 08 posted to sci.physics.relativity
Jeckyl
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Posts: 8,421
Default GPS CLOCK PARADOX

"compiz" wrote in message
...
On Jan 31, 1:54 am, "Jeckyl" wrote:
"bambuu" wrote in message
...
On Jan 31, 12:32 am, "Jeckyl" wrote:
"bambuu" wrote in message
...
On Jan 31, 12:05 am, "Jeckyl" wrote:
"bambuu" wrote in message
...
On Jan 30, 3:38 am, "Jeckyl" wrote:
Just as in the so-called twins paradox .. both twins watches are
correct
for
the relevant twin. One twin really is older than the other.
what is tha difference between
really older and just older?
None, of course, I was just emphasising that it is a *real*
difference
..
not just some sort of optical illusion, or an error in the ticking
of
a
clock.
thanks, so if clock is good, he becomes
really older for no reason
And how did you conclude that nonsense from what I said? No wonder
you
have
problems with physics .. you can't even comprehend written language,
let
alone the mathematics and logic involved.
you said clock no error, but he really gets older

Yes .. he really gets older (the twin that stays at home compared to the
twin the travels).
You really are incredibly slow understanding things

my bad, sorry for thar


If you really are, then that's fine, I am perfectly willing to let bygones
be bygones. Just cut the attitude and hostility.

In the so-called twins paradox, the travelling twin has experienced
less
elapsed time because its path through space-time (which involves
changes
how would you know about others experiences

When they reunit they can have a nice little chat over some coffee ..
that

but when thay reunit is too late, becus their internal
clocks clocks synchronously


From the moment of reuniting on .. yes .. but the difference in elapsed time
happens during the journey .. the travelling twin is younger than the at
home twin.

and therfore you cant put your finger on his clock
and say "look, his clock si clocking slower than
tha other clock" you put yuor other finger on


You can do that during the trip, however. Look up the doppler analysis of
the twins paradox

is assuming the stay-at-home twin is still alive .. the travlling twin
may
end up having to talk to the stay-at-home-twins great great grandchildren
instead.

why that when their clocks are equal?


Really .. you need to keep up here. There clocks would not be equal. They
would show different times (maybe even different days, or years, or
centuries .. depending on the velocities and dinstances invovled). Of
course, after reuniting, the clocks would bovsiouls be ticking at the same
rate (as any observer would agree)

in
frame of reference) is different to that of the stay-at-home twin.
One
can
say that more simply: the stay at home twin is older than the
travelling
twin.
why, entropy goes faster staying home?

Why are you suddenly discussing entropy.

how not doing that?
explain


I don't understand your question "how not doing that?"

It is very simple .. less time has elapsed for the travelling twin
compared
to the stay at home twin,

becus slower clock?


That is what the stay-at-home-twin would see .. yes. Its all relative, of
course.

you cant prove that his clock is
clocking slower than another standard clock


They are both standard clocks .. they both tick at the correct rate for
their frame of refernece .. they are simply taking different routes through
spacetime .. like (as I've mentioned several times) different odometer
readings on cars when they take different routes. Time is a bit
counter-intuitive though, compared to odometres. With cars, the one taking
the straight line has the lowest odomoert reading .. but with time, the one
with the straight line (in this case the stay-at-home-twin) has the longest
time. Time as a fourth dimenions is not exactly like the three spatial
dimensions .. it behaves differently.

elapsing time makes no sense without a standard clock


Well .. it does make sense .. you jsut need a standard clock to measure it
with (ie to be able to put a quantitative figure on it). We can assume that
both twins carry with them a standard clock. When they reunite, their
standard clocks will show a different time.

because the travelling twin has taken a different
path through space-time

different from what path?


The answer is on the line where you interjected your question .. ie

than the stay-at-home twin (from the event where

it says itself, he dident took any path becus
he stayed at home


That is still a path through space-time. That the path (relative to him) is
all a difference in time, and not is space, does not make it any less a
path.

they separate, to the event where they reunite).

they both had the same event?


Yes .. one generally takes it as being a single event (ie assuming that they
were together at the one location). Of course, if this were real twin,s
there ther ewould be at least a few centimeters between them .. but that
doesn't really make any difference in this thought experiment

you can not do that according to fluid dynamics


Fluid dynamics has nothing to do with it.


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