From: Alejandro Dubrovsky (s328940@student.uq.edu.au)
Date: Sun Aug 25 2002 - 00:48:26 MDT
On Sun, 2002-08-25 at 13:04, louisnews Newstrom wrote:
> Relativity says that because there is no preferred frame of reference,
> you cannot tell which clock is moving and which is standing still in
> any INTERTIAL FRAME.
>
> The key here is INTERTIAL. If the clocks are moving, but neither one
> changes speed, then yes, you could not tell which is which. As soon as
> one accellerates, it is NON-INTERTIAL, and all observers will agree
> which clock is accellerating.
>
> Dingle's example strays from the simple example of two objects moving
> with respect to each other. He has one accellerate, turn around, and
> come back. This is the key. All observers will agree which clock
> accellerated. All observers will agree that that clock should be
> slower.
>
This should be pretty easy to test, shouldn't it? If you have two LEO
satellites, and order one to slow down and "push up" (so as to maintain
altitude), and you measure their internal clocks when they meet a couple
of orbits later, you are saying that the one that slowed down should be
slower. (My intuition, FWIW, was that it should have been the other way
around, i thought only speed counted) Hasn't this kind of thing been
done?
alejandro
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