Re: SR's velocity addition -- ANY Experimental Evidence?

From: Androcles (androc1es_at_nospamblueyonder.co.uk)
Date: 07/21/04 

Date: Wed, 21 Jul 2004 11:57:59 GMT

"Darrin Edwards" <edwards@nouce.trurl.bsd.uchicago.edu> wrote in message
news:slrncfrf5f.hie.edwards@trurl.bsd.uchicago.edu...
| In article <ctaLc.3976$Sn2.39699610@news-text.cableinet.net>, Androcles
wrote:
| >
| > "Timo Nieminen" <timo@physics.uq.edu.au> wrote in message
| > news:Pine.LNX.4.50.0407201241480.9287-100000@localhost...
| >| On Tue, 20 Jul 2004, Spaceman wrote:
| >|
| >| > "Timo Nieminen" <timo@physics.uq.edu.au> wrote:
| >| > } (2) The quantity s12^2 = c^2 (t1 - t2)^2 - |r1 - r2|^2 is the same
in
| > all
| >| > } inertial coordinate systems
| >| >
| >| > Can you give reasons for each number?
| >|
| >| The postulates are chosen so that predicted measurements agree with
| >| experimental measurements.
| >|
| >| > What physical "things" or measurements of things, are these numbers
| > representing?
| >|
| >| Time and position vectors of events 1 and 2.
| >
| > Time is not a vector,
|
| Sure it is, it's modeled as a one-dimensional vector.
|
| > it has no inverse.
|
| Cf. the English word "ago".
|
| > You can return from where you were by travelling a distance 1 mile
| > and returning a distance of -1 mile. When you are able to return to
| > when you were by waiting one second and then unwaiting -1 second
| > then you can call time a vector, and not before.
|
| That's because of physics.

Yes, and physics is the topic of discussion.

| Mathematically, time is modelled as a
| one-dimensional vector in both Newtonian mechanics and SR.

Mathematics is Art.
Scientists and Engineers use math as a useful tool, but that doesn't entitle
anyone to pretend they can convert time into distance, mass into time or
distance into mass, even if it possible to do so mathematically. GIGO
applies.
Androcles

| --
| Cheers,
| Darrin

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