From: fortunati.luigi@gmail.com   
      
   Jonathan Thornburg [remove -color to reply] il 21/12/2023 09:19:38 ha   
   scritto:   
   > Since our elevator is "freely-falling", if we measure the (Newtonian)   
   > gravitational acceleration ("little g") at our elevator's center of   
   > mass, we'll find the gravitational acceleration to be *zero* there.   
      
   Attention! This acceleration you are talking about is the one between   
   the center of mass of the elevator and the elevator itself and not the   
   gravitational acceleration between the Earth and the elevator (which is   
   never zero).   
      
   The center of mass of the elevator does not accelerate relative to the   
   elevator but accelerates relative to the Earth (gravity is between the   
   Earth and the entire elevator and not between the elevator and its   
   center).   
      
   > If we're restricted to *only* measurements made inside the elevator,   
   > without looking outside, we have no way of knowing the gravitational   
   > acceleration which would be measured if the elevator were at it's   
   > current position but weren't freely falling.   
      
   It's obvious! If we cannot look outside we do not see the acceleration   
   between the Earth and the elevator but this does not mean that *this*   
   acceleration is not there.   
      
   We must not confuse the gravitational acceleration (practically   
   non-existent) between the elevator and the bodies inside it and that   
   between the Earth and the entire elevator (which is always there, even   
   if we cannot measure it from the inside).   
      
   Luigi Fortunati   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)