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Homework Help: Vector products and torque

  1. Apr 5, 2008 #1
    [SOLVED] Vector products and torque

    1. The problem statement, all variables and given/known data
    A particle is located at the vector position r = (i + 3j) m, and the force acting on it is F = (1i + 7j) N.
    (a) What is the torque about the origin?
    (b) What is the torque about the point having coordinates (0, 4) m?

    3. The attempt at a solution
    I got the answer for the first part, but I am confused about part b. At first I thought I was supposed to just switch (i +3j) with (0,4) but that is not right. So then I thought that maybe I was supposed to do this:
    (1,3) - (0,4) = new vector, and the coordinates for the new vector to find the torque which would be equal to 8 nm. Is that how I am supposed to do it?
  2. jcsd
  3. Apr 5, 2008 #2

    Shooting Star

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    Homework Helper

    Quite correct.
  4. Apr 5, 2008 #3
    I thank ye
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