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Homework Help: Calculus: Vectors: Forces

  1. Feb 27, 2008 #1
    Help!! Calculus: Vectors - Forces Problem...

    First of all, every1 hello! Imma new member...

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

    A charged particle placed at P(1,1) is repelled from the points A(0,0), B(2,0), and C(0,3) by three forces, whose magnitudes are inversely proportional to the square of the distances PA, PB and PC, respectively. In what direction will the particle move initially? (Assume that the proportionality constant is the same for all three forces.)

    The answer is "at angle of 80 degrees to the positive x-axis."

    But how do you find this?

    2. Relevant equations
    COS Law, SIN Law,
    there should be others, but I don't know which ones....

    3. The attempt at a solution

    So far I found out that angle APC is 108*, angle ACP is 27*, Angle PAC is 45*, agnle APB is 90. The length of AP and PB is sq. rt. of 2, and PC is sq. rt. of 5
    Last edited: Feb 27, 2008
  2. jcsd
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