Re: Speed gedanken time (repaired) time dilation 099


"OG" <owen@xxxxxxxxxxxxxxxxxxx> wrote in message
news:459ku3F5lh7nU1@xxxxxxxxxxxxxxxxx
| Hang on, let us suppose that (A) and (B) both want to measure the speed of
| the lines. In that case do you agree that there is the need for a
| transformation between the measurements of (A) and (B)?

Why would a transformation be needed at all?
(A) would measure 0 WRT to himself
(B) would measure 0.5c wrt to himself.
what transformation is needed at all?
They are relative speeds.
relative speeds can be different and need no transformation
at all.


| That of course is a big assumption, isn't it?

No,
Length changing at all is the big assumption.

| So how do we know which measurements are 'reality' then?

The physical measurement is the reality.
the abstract measurement (if disagreeing with reality)
was measured wrong to begin with.



.

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