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Homework Help: Sputnik's period around the earth

  1. Feb 17, 2009 #1
    1. The problem statement, all variables and given/known data
    Sputnik I, the first artificial satellite to circle the planet (October 1957) had a mean orbital radius of 6953 km. Compute its period

    2. Relevant equations

    How do I compute the period?

    3. The attempt at a solution
    I thought that the radii of the sputnik could be compared to that of the moon, and same tih the period.
  2. jcsd
  3. Feb 17, 2009 #2


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    Homework Helper

    All satellite/orbit solutions begin with
    Centripetal Force = Force of gravity
    Then put in the two force formulas. If you are interested in the period use the centripetal force formula that has period instead of velocity - something like F = 4(pi)mr^2/T (I probably have not remembered that exactly right!)

    As usual, solve for the quantity you want to find.
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