Question

Please help, I don't have a clue how to even begin solving this problem.
The total U.S. consumption of energy in a particular year was 5.0*10^12 kilowatt-hours. What is the mass equivalence to this amount of energy?

Answer 1

5*10^12 kwh=5*10^12*1000*3600J
Use
E=mc^2
m=?

Answer 2

c=3*10^8m/s

Answer 3

E=energy
m=mass

Answer 4

Response plz!!!

Answer 5

So, if i am understanding this correctly, i need to divide my energy by c^2 to get my mass?
And if so, what unit is my mass in?

Answer 6

When i do the calculations the way that i think i need to do them, I end up with 200, my questions is, is that 200 grams or is it another unit?

Answer 7

Unit of m will b kg

Answer 8

thanks for your help.

Answer 9

Medal??!!!