Groups > sci.physics.relativity > #577174

Re: New rewritten version of 'annotated version of SRT'

From	Thomas Heger <ttt_heg@web.de>
Newsgroups	sci.physics.relativity
Subject	Re: New rewritten version of 'annotated version of SRT'
Date	2022-02-15 10:49 +0100
Message-ID	<j71b97Feba9U1@mid.individual.net> (permalink)
References	(2 earlier) <j6rpoeFcfn2U1@mid.individual.net> <suacps$lqd$1@gioia.aioe.org> <j6rt0nFd2biU1@mid.individual.net> <sud35d$9j6$1@dont-email.me> <2818049.e9J7NaK4W3@PointedEars.de>

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Am 14.02.2022 um 14:01 schrieb Thomas 'PointedEars' Lahn:
> Mikko wrote:
>
>> On 2022-02-13 08:15:27 +0000, Thomas Heger said:
>>> Am 13.02.2022 um 08:42 schrieb Michael Moroney:
>>>> You don't even know of the ordinary multiplication sign "×"? Really?
>>> Well, ordinary people may use it for multiplication.
>>>
>>> But theoretical physics is another kind of thing, where symbols are
>>> much more complicated than for common mortals.
>>>
>>> In theoretical physics there exist several types of multiplications,
>>> for which different symbols are used. The 'x' used for multiplication
>>> means 'cross product' and nothing else.
>>
>> Do you know any scientific article written in German before World War I
>> that uses "x" for cross product?
>
> I am not sure that this is true either.
>
> To clarify, if Einstein even wrote that, he simply did not mean the
> cross/*vector* product as he *knew* (because by contrast to his critics here
> he did study Physics at a university) that mass is *scalar* quantity.  This
> is just another example of the Dunning–Kruger effect where the incompetent
> (Thomas Heger, and probably you) have a cognitive bias that causes them to
> underestimate the competence of others/experts (Albert Einstein):

Well, possibly Einstein knew what a scalar product is and what the cross 
product is used for.

But my role was that of a (hypothetical) physics professor, who wrote 
corrections to the homework of a student.

In this role it is quite plausible to criticise the use of the cross in 
'Kraftzahl = Masse x Beschleunigung'.

Whether or not he knew the correct sign is irrelevant here.

I have also criticied the equation itself and also the word 'Kraftzahl'.

My aim, in my role as corrector of the homework, was to give the young 
student a hint, about what he should do better next time.

TH

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New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-12 20:18 +0100
  Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-12 20:23 +0100
    Re: New rewritten version of 'annotated version of SRT' Darrel Angus <argus@iiehdc.mx> - 2022-02-12 19:43 +0000
  Crank Thomas Heger perseveres "Dono." <eggy20011951@gmail.com> - 2022-02-12 11:38 -0800
    Re: Crank Dontknow perverses Thomas Heger <ttt_heg@web.de> - 2022-02-12 20:48 +0100
      Re: Crank Dontknow perverses Darrel Angus <argus@iiehdc.mx> - 2022-02-12 21:19 +0000
      Re: Crank Dontknow perverses "Dono." <eggy20011951@gmail.com> - 2022-02-12 15:21 -0800
        Re: Crank Dontknow perverses Richard Hachel <r.hachel@tiscali.fr> - 2022-02-13 00:01 +0000
  Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-12 20:26 +0000
  Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-12 22:12 +0000
    Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-13 08:19 +0100
      Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-02-13 02:42 -0500
        Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-13 09:15 +0100
          Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-13 13:30 +0000
          Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-02-13 12:57 -0500
            Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-14 08:24 +0100
              Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-14 14:13 +0000
              Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-02-14 18:48 -0500
                Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-17 07:52 +0100
                Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-02-17 03:23 -0500
                Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-02-17 00:28 -0800
          Re: New rewritten version of 'annotated version of SRT' Mikko <mikko.levanto@iki.fi> - 2022-02-14 10:16 +0200
            Re: New rewritten version of 'annotated version of SRT' Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-02-14 14:01 +0100
              Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-15 10:49 +0100
                Re: New rewritten version of 'annotated version of SRT' Python <python@example.invalid> - 2022-02-15 13:28 +0100
                Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-02-15 05:09 -0800
                Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-16 07:38 +0100
                Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-15 14:01 +0000
                Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-16 07:45 +0100
                Cretin Thomas Heger perseveres "Dono." <eggy20011951@gmail.com> - 2022-02-15 22:54 -0800
                Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-16 13:32 +0000
                Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-17 07:27 +0100
                Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-17 13:57 +0000
                Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-18 07:40 +0100
                Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-18 14:27 +0000
                Crank Thomas Heger admits he's a fool "Dono." <eggy20011951@gmail.com> - 2022-02-18 10:53 -0800
                Re: New rewritten version of 'annotated version of SRT' Mikko <mikko.levanto@iki.fi> - 2022-02-16 13:12 +0200
                Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-17 07:34 +0100
            Re: New rewritten version of 'annotated version of SRT' Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-02-14 14:34 +0100
        Re: New rewritten version of 'annotated version of SRT' "Dono." <eggy20011951@gmail.com> - 2022-02-14 16:35 -0800
      Re: New rewritten version of 'annotated version of SRT' "Paul B. Andersen" <paul.b.andersen@paulba.no> - 2022-02-13 09:36 +0100
        Re: New rewritten version of 'annotated version of SRT' Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2022-02-13 19:08 +0100
          Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-02-13 17:09 -0500
      Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-13 13:30 +0000
  Re: New rewritten version of 'annotated version of SRT' JanPB <filmart@gmail.com> - 2022-02-12 23:04 -0800
    Re: New rewritten version of 'annotated version of SRT' Thomas Heger <ttt_heg@web.de> - 2022-02-13 09:17 +0100
      Re: New rewritten version of 'annotated version of SRT' Odd Bodkin <bodkinodd@gmail.com> - 2022-02-13 13:30 +0000
        Re: New rewritten version of 'annotated version of SRT' Maciej Wozniak <maluwozniak@gmail.com> - 2022-02-13 05:54 -0800
      Re: New rewritten version of 'annotated version of SRT' Michael Moroney <moroney@world.std.spaamtrap.com> - 2022-02-13 10:35 -0500
      Re: New rewritten version of 'annotated version of SRT' JanPB <filmart@gmail.com> - 2022-02-13 13:31 -0800

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