A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

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.

  • This Question is Closed
  1. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    5.0x10^12

  2. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @peachpi

  3. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Honestly, I've never seen this before, but I think you convert kW-h to J and use E = mc²

  4. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    quite right ....just calculate the year's energy in joules and then use E=mc^2 to find out the mass equivalence ...

  5. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    can you walk me through changing it to joules please

  6. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    okay hold on

  7. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    1 kilowatt hour = 3 600 000 joules

  8. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    convert it your Kwh into joules then put it in E=MC^2

  9. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    E being your energy in jouls ....and C being the speed of light

  10. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    use SI units

  11. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so 5.0*10^12=5,000,000,000,000

  12. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    now multiply it by 3 600 000

  13. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yu get your enerygy in jouls then

  14. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    don t get rid of the exponantional notation here ...it help keeps the number small

  15. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so 1.8*10^19j

  16. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    3 600 000 x (your enrgy in Kwh) = MC^2 you need to fing out M

  17. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    J*

  18. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah ... there ya go ^_^

  19. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    and than the equation i need is M=E/C^2

  20. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    correct?

  21. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

  22. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    good work

  23. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    So M=1.8*10^19J/299792458m/s

  24. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    gottta change m/s to J

  25. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    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

  26. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    everything should be in SI units ....like meter for distance jouls for energy ...

  27. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so what do i do than

  28. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    So M=1.8*10^19J/299792458m/s you said this was your answer right ?

  29. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes but isnt there something more i have to do

  30. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    that figure is your answer .... express it in kilograms and your all set

  31. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    how do i express it in kilograms

  32. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    just do 1.8*10^19/299792458 and add the alphabets Kg in the end

  33. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    would you believe it i am driving right now ....and i pull over to the side to answer your questions

  34. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    are you clear on this ?

  35. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    haha thank you so much

  36. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    feel free to ask .... i am in the parking lot now

  37. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Would you help me with one more question if i post it

  38. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    No problem bro

  39. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    depends if i can solve it myself .... ... hit me with it

  40. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.