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Radial Acceleration of Sun

  1. Oct 14, 2009 #1
    1. The problem statement, all variables and given/known data
    The Milky Way galaxy (including the sun) rotates about its center with a period of 200 million years. The sun is approx. 2 X 10^20m from the center of the galaxy. What is:
    A) The radial acceleration of the sun?
    B) What is the net gravitational force on the Sun due to other stars in the Milky Way Galaxy?

    2. Relevant equations

    I just can't get my head around the 1 revolution per 200million years. How would I work that into a velocity? And then into an acceleration?
  2. jcsd
  3. Oct 14, 2009 #2


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    You have the equation - you just need to know how many seconds in 200Myr

    (Hint 60*60*24*365.25 * 200,000,000)
  4. Oct 14, 2009 #3
    Then would I divide my seconds by 2(pi)(rad) to get my answer in rad/s?
  5. Oct 14, 2009 #4
    To find the Net gravitational force on the sun due to other stars in the galaxy would it just be F= [mass (of sun)] [acceleration (radial acceleration that was found)]
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