Groups > sci.physics.relativity > #582497

Re: Annotated version of SRT

From	Thomas Heger <ttt_heg@web.de>
Newsgroups	sci.physics.relativity
Subject	Re: Annotated version of SRT
Date	2022-04-10 21:04 +0200
Message-ID	<jbgo29FoldtU1@mid.individual.net> (permalink)
References	(19 earlier) <03a03595-b620-438c-939a-b1efadaa0d79n@googlegroups.com> <jba3mtFg7iqU1@mid.individual.net> <t2rukg$1qn8$1@gioia.aioe.org> <jbfd0cFgk3oU1@mid.individual.net> <t2ucsc$rl2$1@gioia.aioe.org>

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Am 10.04.2022 um 12:51 schrieb Python:
> Thomas Heger wrote:
>> Am 09.04.2022 um 14:36 schrieb Python:
>>> Thomas Heger wrote:
>>> ...
>>>> E.g. Y was used as x-component in the electric field strength vector
>>>> at point (x, y, z). That 'Y' is therefore a unitless number, because
>>>> the n-tuple (X, Y, Z) 'inherits' its units from the coordinate system
>>>> it belongs to.
>>>
>>> *facepalm*
>>>
>>> Well, Thomas let's apply this silly idea of yours that vector
>>> components are unitless. If they are unitless their values
>>> won't change if you switch from one unit system to another
>>> one, right?
>>>
>>> There is a glass of water in front of me on the table. Taking
>>> the room walls to define orthogonal axis I can represent the
>>> position of the glass as a three dimension vector (distance
>>> from left well, front wall and floor, right?
>>>
>>> Using SI (meters) I got (1, 1.50, .50)
>>>
>>> Using inches I got (38.37, 59.05, 19.68)
>>>
>>> It is weird for "unitless" numbers to behave that way,
>>> isn't it?
>>
>> A vector is meant as coordinates within a coordinate system. (without
>> a corresponding coordinate system a vector would not make any sense at
>> all.)
>>
>> Therefore your vector (1, 1.50, .50) 'inherits' the SI units from the
>> corresponding coordinate system, which is defined in term of SI units.
>>
>> In such a coordinate system 1 unit of length in the x-direction, for
>> instance, is 1 m long.
>>
>> Because the coordinate system is already 'normed', the n-tuple (1,
>> 1.50, .50) does not need additional units anymore.
>>
>> Not to norm a coordinate system would not make sense, because
>> coordinates are multiples of the unit length used.
>>
>> And because the coordinate system already 'knows' the units, the
>> vectors themselves do not need to know, how long one unit of length
>> is, hence carry only numerical values.
>>
>> If you alter the norm of the coordinate system, you obviously need to
>> alter the numerical values, too, while the meant length would not change.
>>
>> (If vectors carry also units, the system gets 'doubble normed', what
>> is not such a good idea.)
>
> *faceplam*

Well, but possibly you should slap a little harder, because you need to 
wake up.

In fact my description matches what we are taught in Germany about 
vectorial quantities in physics.

see here

https://de.wikipedia.org/wiki/Vektorielle_Gr%C3%B6%C3%9Fe

(Unfortunately you cannot read that, but you could ask google for a 
translation.)

Since you think my description was funny, you were apparently tought 
something else.

This would be very bad, in my oppinion, hence rethinking your 
understanding would be a good idea (for what you should awake from 
half-concious dozing).




...


TH

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Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-06 08:22 +0200
  Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-07 07:45 +0200
    Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-07 01:20 -0700
      Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-08 08:14 +0200
        Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-07 23:47 -0700
  Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-07 01:06 -0700
    Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-08 08:40 +0200
      Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-07 23:56 -0700
        Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-08 20:50 +0200
          Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-08 19:05 -0400
            Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-09 08:08 +0200
              Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-08 23:51 -0700
              Re: Annotated version of SRT Odd Bodkin <bodkinodd@gmail.com> - 2022-04-09 13:02 +0000
                Re: Annotated version of SRT Coke Hishikawa <uhva@blseummh.nm> - 2022-04-09 13:21 +0000
              Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-09 12:18 -0400
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-10 09:14 +0200
                Re: Annotated version of SRT Mikko <mikko.levanto@iki.fi> - 2022-04-10 11:29 +0300
                Re: Annotated version of SRT nospam@de-ster.demon.nl (J. J. Lodder) - 2022-04-10 12:28 +0200
                Re: Annotated version of SRT Mikko <mikko.levanto@iki.fi> - 2022-04-10 16:54 +0300
                Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-11 00:50 -0400
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-10 21:52 -0700
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-11 07:42 +0200
                Re: Annotated version of SRT Odd Bodkin <bodkinodd@gmail.com> - 2022-04-11 11:01 +0000
                Re: Annotated version of SRT Paparios <mrios@ing.puc.cl> - 2022-04-11 05:50 -0700
                Re: Annotated version of SRT nospam@de-ster.demon.nl (J. J. Lodder) - 2022-04-11 18:20 +0200
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-11 09:48 -0700
                Re: Annotated version of SRT Paparios <mrios@ing.puc.cl> - 2022-04-11 09:54 -0700
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-11 12:32 -0700
                Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-11 18:39 -0400
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-11 21:28 -0700
                Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-12 06:36 +0200
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-11 21:38 -0700
                Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-12 06:47 +0200
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-11 21:58 -0700
                Re: Annotated version of SRT Richard Hachel <r.hachel@tiscali.fr> - 2022-04-12 11:14 +0000
                Re: Annotated version of SRT Richard Hachel <r.hachel@tiscali.fr> - 2022-04-12 11:10 +0000
                Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-11 12:38 -0700
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-12 18:48 +0200
                Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-12 11:37 -0700
                Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-13 02:37 -0400
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-14 08:36 +0200
                Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-13 23:44 -0700
                Re: Annotated version of SRT Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-04-14 04:16 -0400
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-14 01:34 -0700
                Re: Annotated version of SRT Odd Bodkin <bodkinodd@gmail.com> - 2022-04-14 12:47 +0000
              Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-10 13:06 +0200
          Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-09 07:48 +0200
      Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-09 14:36 +0200
        Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-09 06:18 -0700
        Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-10 08:49 +0200
          Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-09 23:52 -0700
            Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-10 12:54 +0200
          Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-10 12:51 +0200
            Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-10 05:02 -0700
            Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-10 21:04 +0200
              Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-10 22:08 +0200
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-10 21:20 -0700
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-11 07:48 +0200
                Re: Annotated version of SRT Reinhardt Behm <rbehm@hushmail.com> - 2022-04-11 08:43 +0000
                Re: Annotated version of SRT nospam@de-ster.demon.nl (J. J. Lodder) - 2022-04-11 13:55 +0200
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-11 21:09 +0200
                Re: Annotated version of SRT Reinhardt Behm <rbehm@hushmail.com> - 2022-04-12 02:52 +0000
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-13 07:49 +0200
                Re: Annotated version of SRT Reinhardt Behm <rbehm@hushmail.com> - 2022-04-13 07:41 +0000
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-14 08:21 +0200
                Re: Annotated version of SRT Python <python@example.invalid> - 2022-04-14 14:38 +0200
                Re: Annotated version of SRT Maciej Wozniak <maluwozniak@gmail.com> - 2022-04-14 07:47 -0700
                Re: Annotated version of SRT Reinhardt Behm <rbehm@hushmail.com> - 2022-04-14 15:26 +0000
                Re: Annotated version of SRT Odd Bodkin <bodkinodd@gmail.com> - 2022-04-14 15:42 +0000

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