From: lwcamp@gmail.com   
      
   On Monday, March 13, 2017 at 11:05:53 AM UTC-7, MrAnderson wrote:   
   > Also, it could be used to destroy planetary targets, like tanks, but I am   
   not sure how fast would it burn in atmosphere while travelling by 50 km/s   
      
   In an atmosphere with a density of about that of Earth at sea level, a   
   hypervelocity projectile will go about 100 times its length before being   
   ablated away.  This is independent of speed until you either get to well less   
   than 5 km/s, or to speeds where    
   nuclear forces in the atomic nuclei are being overcome by the collisions.   
      
   Luke   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)