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Homework Help: Classical Mechanics, Double Star, Find the ratio of the masses

  1. Oct 1, 2012 #1


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    1. The problem statement, all variables and given/known data

    The two components of a double star are observed to move in circles of radii r1 and r2. What is the ratio of their masses? (Hint: Write down their accelerations in terms of the angular velocity of rotation, ω.)

    2. Relevant equations
    Newton's 2nd law? law of gravitation?

    3. The attempt at a solution

    I don't know what a double star is and hence I don't know what the system is doing.
  2. jcsd
  3. Oct 1, 2012 #2


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    welcome to pf!

    hi cum! welcome to pf! :smile:
    a double star is two stars, each moving in a circle round their common centre of mass :wink:
  4. Oct 1, 2012 #3


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    Re: welcome to pf!


    Simple enough, all I had to do was let their centripetal force be equal.
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