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Gravity, Quick Help Please!

  1. Jun 15, 2008 #1
    Please check the attachment.

    The question is:
    Find the gravitational field strength at the point A in terms of G.

    So I went about assuming we use g = GM/r^2, for both masses, and then subtract them as we're meant to find the overall using vectorial addition.

    But, the answer in the back of the book is G/4. I can't seem to get this whatsover.

    Could someone run through the calculations please?
    Thanks a bunch!
     

    Attached Files:

  2. jcsd
  3. Jun 15, 2008 #2

    Doc Al

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    Staff: Mentor

    Show what you've done so far. Explain your diagram. What does X mean? What is R?
     
  4. Jun 17, 2008 #3
    Both mass and the distance cannot be represented by 'X'.
     
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