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Homework Help: Space distance question

  1. Oct 29, 2009 #1
    1. The problem statement, all variables and given/known data
    Mirrors left behind the Moon have been used to measure the distance between Earth and the Moon accurately. If the time required for a pulse of light to reach the Moon and return to Earth is 2.562 s, calculate the distance between Earth and the Moon in kilometers.

    2. Relevant equations
    v = d/t

    3. The attempt at a solution

    c = v, therefore 2.998 x 10^8 m/s = v

    d = vt
    = (2.998 x 10^8 m/s)(2.562 s)
    = 768087600 m
    = 768,087.6 km
  2. jcsd
  3. Oct 29, 2009 #2
    You found the distance of the round trip the light takes.
  4. Oct 29, 2009 #3
    so does that mean i divide it by 2?
  5. Oct 29, 2009 #4
  6. Oct 29, 2009 #5
    oh okay thank you very much
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