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Point mass gravitational problem

  1. Mar 23, 2009 #1
    1. The problem statement, all variables and given/known data
    1. A point mass m1= 2kg is at the origin and a second point mass m2=4kg is on the x axis at x=6m. Find the point on the x axis for which g=0


    2. Relevant equations

    g= -Gm/r^2

    3. The attempt at a solution

    So g=0 means that g1+g2=0. I set up that 2(r2)^2= -4(r1)^2 and made r2=x-6 and r1=x.

    Thus, I have a quadratic equation as x^2 -4x+12=0 which has no solution. I am wrong on this question. How should I fix this ??
     
  2. jcsd
  3. Mar 23, 2009 #2

    robphy

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    What would g=0 mean?
     
  4. Mar 23, 2009 #3
    gravitational field.
     
  5. Mar 23, 2009 #4

    robphy

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    Is the gravitational field a vector field?
     
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