From: fortunati.luigi@gmail.com   
      
   Jonathan Thornburg [remove -color to reply] il 21/12/2024 09:27:44 ha   
   scritto:   
   > ...   
   > Now let's look at the same system from a GR perspective, i.e., from a   
   > perspective that gravity isn't a force, but rather a manifestation of   
   > spacetime curvature.  In this perspective it's most natural to measure   
   > accelerations relative to *free-fall*, or more precisely with respect   
   > to a *freely-falling local inertial reference frame* (FFLIRF).  An   
   > FFLIRF is just a Newtonian IRF in which a fixed coordinate position   
   > (e.g., x=y=z=0) is freely falling.   
      
   Can we define the interior space of the elevator as "local" or is it   
   too big?   
      
   If it is too big, how big must it be to be considered "local"?   
      
   If it is shown that there are real forces inside the free-falling   
   elevator, can we still consider this reference system inertial?   
      
   Are tidal forces real?   
      
   Do we mean by "freely falling bodies" only those that fall in the very   
   weak gravitational field of the Earth or also those that fall in any   
   other gravitational field, such as that of Jupiter or a black hole?   
      
   Luigi Fortunati.   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)