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ChrisV

  • 2 years ago

The distance from Earth to the Moon is approximately 240,000 mi. The speed of light is 3.00 * 10^8 m/s. How long does it take for light to travel from Earth to the Moon and back again? Please Show work.

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  1. HawkCrimson
    • 2 years ago
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    time from the earth to the moon = 240000m /(3.00*10^8)m/s time = .0008s therefore to the moon and back = .0016s

  2. HawkCrimson
    • 2 years ago
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    understand?

  3. ChrisV
    • 2 years ago
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    well its miles to meters

  4. ChrisV
    • 2 years ago
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    so first have to convert

  5. HawkCrimson
    • 2 years ago
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    oh ok ill fix it then thx

  6. ChrisV
    • 2 years ago
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    1 mi = 1609.34 m

  7. HawkCrimson
    • 2 years ago
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    kk

  8. ChrisV
    • 2 years ago
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    but i do understand what you did and thanks

  9. ChrisV
    • 2 years ago
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    this dimensional analysis stuff does not agree with me at times lol

  10. HawkCrimson
    • 2 years ago
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    ok then make the correction and it'll look like this time = 240000*1609.34/(3*10^8)

  11. HawkCrimson
    • 2 years ago
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    haha kk :)

  12. HawkCrimson
    • 2 years ago
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    n of course multiply the answer by 2

  13. ChrisV
    • 2 years ago
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    you could just begin with 480000 right?

  14. HawkCrimson
    • 2 years ago
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    yea u could just because its doesnt throw off the working

  15. ChrisV
    • 2 years ago
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    480000 mi * 1609.34m/mi * s/300000000

  16. ChrisV
    • 2 years ago
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    300000000 m oops

  17. HawkCrimson
    • 2 years ago
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    if this is home work then you shouldnt multiply by 2 first actually cause yes you'll get the rigt answer but when u write ur statements u'll have to explain y u muliplied by 2 n it makes more sense to do it after

  18. ChrisV
    • 2 years ago
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    i still get the wrong answer i think >.< i get 2.57 s

  19. HawkCrimson
    • 2 years ago
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    yea that is the correct answer

  20. ChrisV
    • 2 years ago
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    (4800000 * 1609.34)/300000000 = 2.57s

  21. HawkCrimson
    • 2 years ago
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    yep

  22. ChrisV
    • 2 years ago
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    k thanks a ton

  23. HawkCrimson
    • 2 years ago
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    sure thing :)

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