From: gerry@bindweed.com   
      
   In article , fortunati.luigi@gmail.com   
   says...   
   >   
   > The BC stick is dropped vertically into an endless well.   
   >   
   > Let M be the midpoint between B and C.   
   >   
   > In this mental experiment, the  acceleration of M (relative to the   
   > well) is constant.   
   >   
   > When the stick speed becomes relativistic, does the acceleration of   
   > points B and C (always in the well reference) remain equal to  or   
   > is it greater or lesser?   
      
      
   In the frame of an external universe containing a static force well (I   
   assume that's what you mean by the well reference), you'll see the rigid   
   stick contract, assuming it can hold itself together against the tidal   
   forces.   
      
   - Gerry Quinn   
      
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