Question: what is the awnser to the element e=mc2

James Holloway answered on 13 Mar 2013:

So let’s break down what it means.

e = Energy
m = Mass
c = The speed of light.

Stuff has lots of energy stored inside of it, tremendous amounts in fact. If you could turn a bottle of water into all the energy stored in it then you’d be able to power a city for ages! We can find out how much energy is stored in a bottle of water using the equation e = mc2

Say a bottle of water has mass of 1 kilogram.
Then we say m = 1.
We know the speed of light is c = 300,000,000.
Now we can do the sums:

e = 1 x 300,000,000 x 300,000,000
= 90,000,000,000,000,000 joules of energy.

So there is enough energy tied up in a large bottle of water to power the entire world for an entire hour. If only we could unlock it..