00:01
In this problem, we're going to talk about relativistic energy.
00:04
And what we need to remember is that the rest energy of a particle that has a mass m is mc squared, where c is the speed of light.
00:15
And what we have in our problem is the chemical energy of gasoline, and the chemical energy i'm going to call it ec of gasoline, is 46 megajoules per kilogram.
00:33
And our goal is to find what would be the mass necessary to produce 46 megajoules of energy, that is the energy of one kilogram, the chemical energy of one kilogram of gasoline, if this mass was totally, to be totally converted to energy in the form of its rest energy.
00:57
Well, basically, we want the rest energy to be equal to 46 megajoules, and we want this to be equal to mc squared.
01:08
So the mass, m, is equal to the energy of 46 megajoules...