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From: Darwin123 on 10 May 2010 17:13
On Mar 18, 12:15 pm, DSeppala <dsepp...(a)austin.rr.com> wrote:

>     In this second experiment, there is not any synchronization >of events among the 2000 segments in the moving frame.
Then the segments are going to be squashed together by the
effective gravitational force. Obviously, some type of communication
is necessary between the segments or it isn't a valid frame.  
The force that accelerates the 2000 segments have to be
synchronized in order that the 2000 elements move as a solid body. If
the force is applied evenly, the force has to be timed to act
coherently in all 2000 bodies. If the force is applied to one point,
the force has to be propagated throughout the observer at the speed of
sound. In either case, the force that causes the acceleration has to
be times just right.
All forces have a delay caused by propagation. If the measurements
are small, this propagation delay time is minor. If your ruler is only
1 micron long, then the time delay caused by the speed of sound is
minor. In general relativity, it is said that special relativity
applies only in the local approximation. The two ends of the ruler
have to be "synchronized" in order for the ruler to remain
calibrated.
>Which part of
> this analysis is in error?
As usual, you are ignoring the force that causes the observer to
accelerate. The observer won't accelerate unless a force is applied to
him. He won't be intact unless that force is distributed evenly.
Synchronization is implied in the force. The assumption is that the
uneven force on the ruler or clock doesn't break it. If so, the
material making the ruler or clock have to distribute the force evenly
and quickly over the entire material.
>  In realize that in the rest frame when
> each moving segment lights up, the entire segment doesn't light >up simultaneously as measured in the rest frame. However, I >wasn't able to see how to include that to make the rest frame >observers measure 20 hits each time the experiment is performed.
Calculations of the accelerated frame have to be truncated to
first order to ignore things like the ruler being warped by the g-
pressure. Something equivalent to synchronization has to be performed
in order to prevent that warping. Somehow, the force that accelerates
the measuring instruments have to be synchronized with each other.
You can't totally ignore the force that is using the acceleration.
From: eric gisse on 10 May 2010 18:47
Darwin123 wrote:

[...]

Jeeze.
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