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Homework Help: Satellites in Circular Orbit

  1. Mar 15, 2007 #1
    1. The problem statement, all variables and given/known data
    What is orbital speed of 2nd satellite?
    • velocity of satellite 1 is 17000 meters/second
    • radius of satellite 1 to center of planet is 5250000 meters
    • radius of satellite 2 to planet is 8600000 m

    2. Relevant equations
    Fc = mv2/r

    3. The attempt at a solution
    ? not a clue
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Mar 15, 2007 #2

    Doc Al

    User Avatar

    Staff: Mentor

    This is one of the equations you need. What force provides the centripetal force? (That will be the second relationship you'll need.)

    Hint: Set up a ratio of v2 to v1
  4. Mar 15, 2007 #3
    try equating gravity and centripetal force then you should be able to rearange the formula to find v?

    perhaps this is right if its not i also need help on this question :confused:

  5. Mar 16, 2007 #4
    I figure it out.
  6. Mar 17, 2007 #5


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    Science Advisor
    Homework Helper

    You've got me wondering...
    What is the orbital speed of the second satellite?
    How did you find it?
  7. Mar 17, 2007 #6

    orbital velocity,v= sqrt[gr]

    v1=17000 m/s
    r1=5250000 m
    r2=8600000 m

    so, v2/v1=sqrt[r2 /r1]
    v2=v1 * sqrt[r2/r1]

    answer:21,758 m/s
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