# Math Help - Converting mass to energy - Special relativity

1. ## Converting mass to energy - Special relativity

The sun produces energy by effectively converting mass into energy via means of nuclear fusion reactions deep in its core. In one second the sun outputs roughly 3.86×1026 J of energy. How much mass does the sun lose in one second in order to produce this energy? [c=3×108 m/s]

[Specify units of 'kg', 'tons', or 'Mtons' in your answer, metric tons (=tonnes) only! Mtons = mega-tons, ktons = kilotons]

2. Use $e= mc^2$, of course. It should be very easy to solve $3.86\times 10^{26}= m(3\times 10^8)^2$.