$E=mc^2$ explanation needed

Asked Aug 18 '13 at 16:41

Active Aug 18 '13 at 16:45

Viewed 67 times

My question is pretty standard and easy,I wonder all my life how Einstein get energy equation $E=mc^2$.

Also I some videos about that equation on YouTube and some of the peoples said there that the equation $E=mc^2$ isn't full.

Any help will be appreciated.

edited Aug 18 '13 at 16:45

Qmechanic

asked Aug 18 '13 at 16:41

Gil

2

Possible duplicate: http://physics.stackexchange.com/q/43813/2451 – Qmechanic Aug 18 '13 at 16:46
$E=c^2 m$ only applies to an object you observe to be at rest. When the object has momentum $p$, the complete energy-momentum equation $E^2 - (c p)^2 = (c^2 m)^2$ needs to be applied. For an accessible discussion, see: http://www.science20.com/hammock_physicist/whats_wrong_emc2 – Johannes Aug 18 '13 at 17:05

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