From: sylvia@not.at.this.address   
      
   On 19/07/2017 2:01 AM, LuigiFortunati wrote:   
   > Sylvia Else alle ore 10:52:40 del 17/07/2017 ha scritto:   
   >>> 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?   
   >>   
   >> We're not told which of B and C is the upper end.   
   >   
   >    Let B be the top and C the lower one.   
   >   
   >> However, the   
   >> acceleration of the upper end is greater than that of M, and the   
   >> acceleration of the lower end is less than that of M. Thus the stick   
   >> gets shorter in the frame of the well (but not, of course, in the frame   
   >> of the stick).   
   >   
   >    So ahead of B runs the shaft wall with greater acceleration than it   
   > does run in front of C, right?   
   >   
      
   I'm not sure what you mean by that.   
      
   Sylvia.   
      
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