14 March 2008 A shortcut to E=mc2

Have you ever considered how to actually derive the famous E=mc2  formula? Does it require knowledge of Special Relativity or even worse: an understanding of the theory?. Well, no! The only skill needed is some high-school physics and a bit of curiosity. There is a box of mass M and horizontal length L in the picture below.The center of mass of the box in rest hangs somewhere above point...

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