Groups > sci.physics.relativity > #626395

Ehrenfest paradox

From	Thomas Heger <ttt_heg@web.de>
Newsgroups	sci.physics.relativity
Subject	Ehrenfest paradox
Date	2023-12-24 09:17 +0100
Message-ID	<kuq7ihFpeblU1@mid.individual.net> (permalink)

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Hi NG

I had recently read a book about GR and found it astonishing, what 
Einstein and Ehrenfest said about observers on a rotating disk.

https://en.wikipedia.org/wiki/Ehrenfest_paradox



To me it is selfevident, that observers on a rotating disk would 
encounter some kind of outwards acceleration, if that disk rotates.

Also the rigid disk itself would ecounter 'length elongation' (radius 
gets longer), because the centrifugal acceleration tends to tear the 
disk apart.

But neither of these effects were mentioned, while the similarity to 
gravitation assumed.

But as far as I know, gravitation pulls into the opposite direction 
(towards the center).

And: the observer could not possibly regard his rotating disk as at 
rest, because he had trouble to stay on his feet and on the disk, if 
that disk rotates.




TH

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Ehrenfest paradox Thomas Heger <ttt_heg@web.de> - 2023-12-24 09:17 +0100
  Re: Ehrenfest paradox nospam@de-ster.demon.nl (J. J. Lodder) - 2023-12-24 13:18 +0100
    Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2023-12-25 16:26 +0000
      Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2023-12-27 02:21 +0000
        Re: Ehrenfest paradox Thomas Heger <ttt_heg@web.de> - 2023-12-27 06:39 +0100
          Re: Ehrenfest paradox Thomas Heger <ttt_heg@web.de> - 2023-12-28 09:04 +0100
            Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2023-12-28 08:31 +0000
              Re: Ehrenfest paradox Thomas Heger <ttt_heg@web.de> - 2024-01-03 08:51 +0100
                Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2024-01-03 10:56 +0000
                Re: Ehrenfest paradox Maciej Wozniak <maluwozniak@gmail.com> - 2024-01-03 09:53 -0800
                Re: Ehrenfest paradox Thomas Heger <ttt_heg@web.de> - 2024-01-04 08:23 +0100
                Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2024-01-04 10:05 +0000
                Re: Ehrenfest paradox Thomas Heger <ttt_heg@web.de> - 2024-01-05 07:26 +0100
                Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2024-01-05 12:33 +0000
          Re: Ehrenfest paradox nospam@de-ster.demon.nl (J. J. Lodder) - 2023-12-28 13:18 +0100
            Re: Ehrenfest paradox Maciej Wozniak <maluwozniak@gmail.com> - 2023-12-28 04:46 -0800
            Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2023-12-28 14:19 +0000
              Re: Ehrenfest paradox Python <python@invalid.org> - 2023-12-28 16:10 +0100
                Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2023-12-28 16:16 +0000
              Re: Ehrenfest paradox JanPB <filmart@gmail.com> - 2023-12-28 15:03 -0800
                Re: Ehrenfest paradox Ross Finlayson <ross.a.finlayson@gmail.com> - 2023-12-28 19:34 -0800
                Re: Ehrenfest paradox Maciej Wozniak <maluwozniak@gmail.com> - 2023-12-28 21:05 -0800
            Re: Ehrenfest paradox Ross Finlayson <ross.a.finlayson@gmail.com> - 2023-12-28 10:14 -0800
              Re: Ehrenfest paradox Maciej Wozniak <maluwozniak@gmail.com> - 2023-12-28 11:04 -0800
                Re: Ehrenfest paradox Ross Finlayson <ross.a.finlayson@gmail.com> - 2023-12-28 11:08 -0800
              Re: Ehrenfest paradox Ross Finlayson <ross.a.finlayson@gmail.com> - 2023-12-28 19:32 -0800
            Re: Ehrenfest paradox Thomas Heger <ttt_heg@web.de> - 2023-12-31 08:08 +0100
              Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2023-12-31 09:38 +0000
              Re: Ehrenfest paradox nospam@de-ster.demon.nl (J. J. Lodder) - 2024-01-04 12:00 +0100
                Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2024-01-04 11:24 +0000
                Re: Ehrenfest paradox Tom Roberts <tjoberts137@sbcglobal.net> - 2024-01-04 12:18 -0600
                Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2024-01-04 22:18 +0000
                Re: Ehrenfest paradox pnalsing@gmail.com (palsing) - 2024-01-04 23:07 +0000
                Re: Ehrenfest paradox Maciej Wozniak <maluwozniak@gmail.com> - 2024-01-04 21:56 -0800
                Re: Ehrenfest paradox pnalsing@gmail.com (palsing) - 2024-01-05 06:36 +0000
                Re: Ehrenfest paradox Maciej Wozniak <maluwozniak@gmail.com> - 2024-01-04 23:45 -0800
                Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2024-01-05 12:18 +0000
    Re: Ehrenfest paradox Ross Finlayson <ross.a.finlayson@gmail.com> - 2023-12-28 01:15 -0800
    Re: Ehrenfest paradox JanPB <filmart@gmail.com> - 2023-12-28 15:00 -0800
      Re: Ehrenfest paradox nospam@de-ster.demon.nl (J. J. Lodder) - 2024-01-03 14:28 +0100
        Re: Ehrenfest paradox Maciej Wozniak <maluwozniak@gmail.com> - 2024-01-03 09:54 -0800
        Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2024-01-03 18:09 +0000
          Re: Ehrenfest paradox Athel Cornish-Bowden <me@yahoo.com> - 2024-01-03 19:48 +0100
            Re: Ehrenfest paradox Adolf Göbel <adolfgoebel@aol.com> - 2024-01-03 22:21 +0100
          Re: Ehrenfest paradox JanPB <filmart@gmail.com> - 2024-01-03 11:25 -0800
  Re: Ehrenfest paradox wugi <wugi@brol.invalid> - 2023-12-28 22:31 +0100
    Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2023-12-29 07:42 +0000
      Re: Ehrenfest paradox wugi <wugi@brol.invalid> - 2023-12-29 12:51 +0100
        Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2023-12-29 12:58 +0000
          Re: Ehrenfest paradox Ross Finlayson <ross.a.finlayson@gmail.com> - 2023-12-29 07:55 -0800
        Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2023-12-29 13:25 +0000
          Re: Ehrenfest paradox Python <python@invalid.org> - 2023-12-29 14:36 +0100
            Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2023-12-29 13:43 +0000
              Re: Ehrenfest paradox Python <python@invalid.org> - 2023-12-29 14:45 +0100
                Re: Ehrenfest paradox Maciej Wozniak <maluwozniak@gmail.com> - 2023-12-29 06:48 -0800
            Re: Ehrenfest paradox Athel Cornish-Bowden <me@yahoo.com> - 2023-12-29 16:24 +0100
              Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2023-12-29 15:29 +0000
                Re: Ehrenfest paradox Python <python@invalid.org> - 2023-12-29 20:33 +0100
                Re: Ehrenfest paradox Maciej Wozniak <maluwozniak@gmail.com> - 2023-12-29 12:11 -0800
                Re: Ehrenfest paradox Python <python@invalid.org> - 2023-12-29 21:22 +0100
                Re: Ehrenfest paradox Maciej Wozniak <maluwozniak@gmail.com> - 2023-12-30 01:34 -0800
                Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2023-12-30 10:02 +0000
                Re: Ehrenfest paradox Athel Cornish-Bowden <me@yahoo.com> - 2023-12-30 11:06 +0100
                Re: Ehrenfest paradox Maciej Wozniak <maluwozniak@gmail.com> - 2023-12-30 02:33 -0800
                Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2023-12-30 11:07 +0000
              Re: Ehrenfest paradox Python <python@invalid.org> - 2023-12-29 16:53 +0100
            Re: Ehrenfest paradox wugi <wugi@brol.invalid> - 2023-12-29 23:59 +0100
              Re: Ehrenfest paradox Maciej Wozniak <maluwozniak@gmail.com> - 2023-12-30 01:37 -0800
              Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2023-12-30 17:59 +0000
                Re: Ehrenfest paradox Volney <volney@invalid.invalid> - 2024-01-03 23:30 -0500
    Re: Ehrenfest paradox Richard Hachel <r.hachel@tiscali.fr> - 2023-12-29 07:44 +0000

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