Wwanderer
Kids, don't try this at home!
- Joined
- Nov 17, 2010
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You don't solve E=mc2: it's an approximation for bodies at rest.
Uhhhh...well, while the info in the video you link is all correct, E=mc^2 is not normally described as an approximation (never would be closer to it) by physicists. Rather it is an exact formula for the "rest-mass energy" of an object (of mass m) or, equivalently, of an object's energy in its own frame of reference (relativity is all about frames of reference, of course). The momentum term discussed in the video must be added if you want the total (rest-mass plus kinetic) energy in a frame of reference moving with respect to the object. Are we off-topic yet?
More to the point of the immediate discussion, in physics "constants" are normally taken to be unchanging numerical values of some sort, as @User#16452 says, rather than objects (such as hydrogen atoms) with are not changing. It is just semantics of course, but she is definitely correct in terms of conventional usage in physics and other/lesser physical sciences (such as chemistry).
But on this day of the year, perhaps we should regard love as the most important constant in the Universe!
(How's that for smooth finish!)
-Ww