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Homework Help: Find its speed.

  1. Sep 18, 2009 #1
    1. The problem statement, all variables and given/known data

    The earth travels around the sun in a circle of radius 150 million km and does a complete cycle in about 365 days. Find its speed.



    2. Relevant equations

    v= d/t



    3. The attempt at a solution

    d = 1000m/1km x 150,000,000km = 1.5 x 10^11m
    There are 31,536,000 seconds in 1year.
    v = 1.5 x 10^11/31,536,000 = 4.7 x 10^18 they say this is wrong answer and the right answer is actually 29 800 m/s.
    Please help? Thank you.
     
  2. jcsd
  3. Sep 18, 2009 #2
    Find the circumference of Earth's orbit. You used the radius.
     
    Last edited: Sep 18, 2009
  4. Sep 18, 2009 #3
    d = circumfrence = 2piR= 2 * 3.1415 * 150 * 10^6km
    t = 365 day.
    s = d(in meters) / t(in seconds)
     
  5. Sep 18, 2009 #4
    it's been solved...i calculated circumferance and it worked out to be the right answer. thank you!
     
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