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Re: Mass Energy

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Posted by Zephram Cochrane/">Zephram Cochrane on November 8, 1999 03:31:28 UTC

: But if E2 = m2c4 +p2 c2 : and the initial momentum, of say a fission weapon, is zero then the final : momentum must also be zero. Which seems to say that m = (E2/c4)1/2 : and therefore energy has mass, and what has happened is that matter (not : mass) has been converted to radiation.

I didn't define mass here as "center of momentum frame" energy. I defined it as "local proper frame" energy. Once the nuke has blown up most people think of it as one object any more. Instead you have many diffuse particles and so it's senseless to think of it as an individual massive object anymore. Thinking of the final state as many particles instead of one object, then the equation should be SEfinal = Einitial = minitialc2

Not: SEfinal = Smfinalc2

I could probably count on one hands fingers how many physicists think of the final state as a single object. That doesn't mean you can't do the physics under your paradigm. It just means that most don't do it that way.

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