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Gravitational field strength between masses

  1. Jan 5, 2013 #1
    1. The problem statement, all variables and given/known data


    A mass at a point X gives rise to a gravitational field strength g at point P as shown. An identical mass is placed at point Y

    x ________ p ______________________ y

    The resultant g f s is now?

    2. Relevant equations

    g = Gm/r2

    3. The attempt at a solution

    I know the answer is between g and zero but don't know if my method is correct?

    I'm assuming distance x to p is r and p to r is approximately 2r

    Am I right that g = Gm/r2 - Gm/2r2 so g is approximately 1/2?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Jan 5, 2013 #2

    haruspex

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    Write out Gm/2r2 more carefully (using parentheses) and you might spot your error.
     
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