About 50 Years Ago - an Astronomy Net Blackholes Forum Message

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About 50 Years Ago

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Posted by Bruce on January 10, 2001 05:33:37 UTC

They got smart and started calling m rest mass. This way it is a useful tool (an invariant to coordinate transformations and invariants are 'Jewels' in relativity) while leaving energy to be called energy.
r = 2M not r = M. Whether you use mrelativistic or mo the answers should be the same and hopefully right. Your answers are wrong.
http://math.ucr.edu/home/baez/physics/mass.html
http://www.physics.purdue.edu/~hinson/ftl/html/FTL_part1.html#sec:eandp

Follow Ups:

Both E's are numerically the same - jim_b - January 10, 2001 - 10:39 UTC
- A possible objection - jim_b - January 10, 2001 - 21:45 UTC

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