From: lemhenyil@yahoo.ca   
      
   On Saturday, October 29, 2022 at 9:17:57 AM UTC-4, Luigi Fortunati wrote:   
   > If we let all the elevators in the world move freely (unhindered), they   
   > would head towards the center of the Earth where they would all meet.   
   >   
   > If we rested a body anywhere else, it would invariably accelerate   
   > towards the center of the Earth, and only if we rested it in the center   
   > of the Earth would it remain stationary in its place.   
   >   
   > So there is no doubt that the center of the Earth is not the same as   
   > all the other points but it is very special, because it is a center of   
   > gravity (and the other points don't).   
   >   
   > Also for General Relativity, is the center of the Earth different from   
   > all other points?   
   Realistically ...can one be sure that  ....there exists such a thing   
   ..that is a point-like centre of gravity?   
   That is ...other than...a convenient mathematical abstraction.   
   I am inclined to believe that even the equivalence principle itself is   
   ..just a statement ..convenient for mathematicians..to play with   
   ..... physics.   
   As a hint, why do I think this.....well, remembering Einstein's   
   elevator.....I am quite sure that in any REAL "elevator" ,   
   an observer CAN without major difficulties, using minimal laboratory   
   equipment, point to the real situation, that is... he could tell apart   
   gravitational field versus accelerated movement.   
   Where then will this leave..General Relativity?   
                   Now, I would like to consult you guys, about a different   
   subject. some of you may be better informed than I am.   
   I have tried, unsuccessfully, create magnetic effects by moving   
   (rotating) electrically charged objects.   
   Other than Rowland's experiment I could not find on the subject.   
   Do you have any suggestions on this matter?   
      
   Best regards, LL   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)