Groups > sci.physics.relativity > #582538

Re: Annotated version of SRT

From	Thomas Heger <ttt_heg@web.de>
Newsgroups	sci.physics.relativity
Subject	Re: Annotated version of SRT
Date	2022-04-11 07:48 +0200
Message-ID	<jbhtpkFre1U1@mid.individual.net> (permalink)
References	(20 earlier) <t2rukg$1qn8$1@gioia.aioe.org> <jbfd0cFgk3oU1@mid.individual.net> <t2ucsc$rl2$1@gioia.aioe.org> <jbgo29FoldtU1@mid.individual.net> <t2vdf7$1kg8$3@gioia.aioe.org>

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Am 10.04.2022 um 22:08 schrieb Python:
> Idiot and liar Thomas Heger wrote:
>> 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.
>
> Certainly not. You goofed. And I can read German. You are dumb.

Then why don't you read the page about vectorial quantities?

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

"In contrast to geometric vectors, a vector quantity does not represent 
a spatial displacement. So are e.g. for example, forces are not elements 
of position space, but of their own vector space, even if they are 
entered in spatial sketches for illustration. In other words: although 
they are represented as directed lines, they usually do not have the 
dimension of length".

translation by google



TH

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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
                Re: Annotated version of SRT Thomas Heger <ttt_heg@web.de> - 2022-04-15 18:29 +0200
                Re: Annotated version of SRT Odd Bodkin <bodkinodd@gmail.com> - 2022-04-15 17:00 +0000
                Re: Annotated version of SRT JanPB <filmart@gmail.com> - 2022-04-15 15:46 -0700

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