anonymous
  • anonymous
The total U.S. consumption of electricity in a particular year was 5.0 x 1012 kilowatt-hours. What is the mass equivalence of this amount of energy? Show all calculations leading to an answer.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
5.0x10^12
anonymous
  • anonymous
@peachpi
anonymous
  • anonymous
Honestly, I've never seen this before, but I think you convert kW-h to J and use E = mc²

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More answers

anonymous
  • anonymous
quite right ....just calculate the year's energy in joules and then use E=mc^2 to find out the mass equivalence ...
anonymous
  • anonymous
can you walk me through changing it to joules please
anonymous
  • anonymous
okay hold on
anonymous
  • anonymous
1 kilowatt hour = 3 600 000 joules
anonymous
  • anonymous
convert it your Kwh into joules then put it in E=MC^2
anonymous
  • anonymous
E being your energy in jouls ....and C being the speed of light
anonymous
  • anonymous
use SI units
anonymous
  • anonymous
so 5.0*10^12=5,000,000,000,000
anonymous
  • anonymous
now multiply it by 3 600 000
anonymous
  • anonymous
yu get your enerygy in jouls then
anonymous
  • anonymous
don t get rid of the exponantional notation here ...it help keeps the number small
anonymous
  • anonymous
so 1.8*10^19j
anonymous
  • anonymous
3 600 000 x (your enrgy in Kwh) = MC^2 you need to fing out M
anonymous
  • anonymous
J*
anonymous
  • anonymous
yeah ... there ya go ^_^
anonymous
  • anonymous
and than the equation i need is M=E/C^2
anonymous
  • anonymous
correct?
anonymous
  • anonymous
yes
anonymous
  • anonymous
good work
anonymous
  • anonymous
So M=1.8*10^19J/299792458m/s
anonymous
  • anonymous
gottta change m/s to J
anonymous
  • anonymous
Basically, the equation states that matter and energy are identical. If you could convert a small amount of matter completely, it would yield a tremendous amount of energy. in your case how ever you are finding the mass cause you already know the energy
anonymous
  • anonymous
everything should be in SI units ....like meter for distance jouls for energy ...
anonymous
  • anonymous
so what do i do than
anonymous
  • anonymous
So M=1.8*10^19J/299792458m/s you said this was your answer right ?
anonymous
  • anonymous
yes but isnt there something more i have to do
anonymous
  • anonymous
that figure is your answer .... express it in kilograms and your all set
anonymous
  • anonymous
how do i express it in kilograms
anonymous
  • anonymous
just do 1.8*10^19/299792458 and add the alphabets Kg in the end
anonymous
  • anonymous
would you believe it i am driving right now ....and i pull over to the side to answer your questions
anonymous
  • anonymous
are you clear on this ?
anonymous
  • anonymous
haha thank you so much
anonymous
  • anonymous
feel free to ask .... i am in the parking lot now
anonymous
  • anonymous
Would you help me with one more question if i post it
anonymous
  • anonymous
No problem bro
anonymous
  • anonymous
depends if i can solve it myself .... ... hit me with it

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