
 Re: relativistic counterpart of gravitational energy (Site not responding. Last check: ) 
  In article <9ab0n7$ei7$1@news.state.mn.us>, Charles Francis wrote: >in the Newtonian approximation the gravitational field >generated by different types of elementary particle is not necessarily >directly proportional to their inertial mass. 
  Then the gravitational force on m1 is G m_p m2_a/r^2, while that on m2 is (oppositely directed) G m_p m1_a/r^2, so the net (sum) force will be nonzero, leading to a selfacceleration, i.e. 
  The Kruezer experiment shows that active gravitational mass = passive gravitational mass for labsized bodies of very different chemical composition (= relative fractions of strong, weak, and electromagnetic binding energy, of protons, neutrons, and electrons, of differnt quark types). 
 www.lns.cornell.edu /spr/200104/msg0032181.html (458 words) 
