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physics

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A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.80 104 m/s, and the radius of the orbit is 5.45 106 m. A second satellite also has a circular orbit around this same planet. The orbit of this second satellite has a radius of 8.60 106 m. What is the orbital speed of the second satellite?

  • physics -

    centripetal force = gravitational force

    m V^2/R = GMm/R^2

    m is the satellite mass, which cancels out. M is the planet mass. G is the universal gravity constant.

    Note that R*V^2 = G M, which is the same for both satellites
    Use that fact to answer your question.

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