From: mikko.levanto@iki.fi   
      
   On 2024-02-05 08:10:44 +0000, Luigi Fortunati said:   
      
   > There is a well that reaches exactly the center of the Earth and there   
   > are two elevators: one stationary at the bottom of the well (elevator A)   
   > and the other in free fall (elevator B).   
   >   
   > Are the two elevators inertial reference systems of the same type or is   
   > one reference system more inertial than the other?   
   >   
   > Luigi Fortunati   
      
   The elevator B is moving so it is affected by air resistance and other   
   friction effect. It also meets the fast varying tidal effects from   
   density variations in the matter around the well.   
      
   If these effects can be kept small enough that they cannot be detected   
   in B then B is in free fall.   
      
   If the well is deep enough that the elevator A does not touch its   
   bottom the elevator A is in free fall.   
      
   If both elevators are in free fall in the above sense then there is   
   no detectable difference in the conditions inside of the elevator.   
      
   When the two elevators collide neither of the elevators is no longer   
   in free fall.   
      
   --   
   Mikko   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)