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Universal gravity

  1. Sep 17, 2008 #1
    hey i have 2 very simple questions i cant seem to do.

    1) determine the speed of the earth around the sun...

    2)The asteroid Pallas has an orbital period of 4.62 years. find the semi-major axis of its orbit.

    i no these r simple but i jsut cant seem to get them can someone help me or let me know of some formulas that will help? thank you in advance
  2. jcsd
  3. Sep 17, 2008 #2


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    Look up Kepler's laws in your book.
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