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Help with gravitational fields

  1. Nov 25, 2004 #1
    A planet is revolving around a star 2.9 X 10^7 km away, how long does it take to go around oncee?

    also
    what is the ratio of a p+ gravitational field to that of an -e?
     
    Last edited: Nov 25, 2004
  2. jcsd
  3. Nov 25, 2004 #2
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