From: tjroberts137@sbcglobal.net   
      
   On 8/22/19 2:26 AM, Herbert Glazier wrote:   
   > When an electron is accelerated to 99.99999999 of c and weighs 37,000   
   > times its rest mass how much has it length made shorter?   
      
   Hmmm. Weight does not make much sense for such a relativistic particle.   
      
   If you are thinking of its "relativistic mass", which is really its   
   energy, the ratio of a particle's energy to its mass is called gamma,   
   which is 1/sqrt(1-v^2/c^2); gamma is also the ratio of an object's   
   measured length while moving to its proper length (length at rest).   
   Note, however that we don't know the actual size of an electron, so your   
   question cannot be answered.   
      
   	For speed 0.9999999999*c, I get a different value for gamma   
   	than you give: 70,711. Beware of numerical problems in your   
   	calculator.   
      
   > Does this effect its spin?   
      
   No.   
      
   > Its field?   
      
   Its (electromagnetic) field measured in its rest frame -- NO.   
   Its (electromagnetic) field measured in the lab -- YES, dramatically.   
      
   > Its flow?   
      
   I don't know what you mean by that.   
      
   Tom Roberts   
      
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