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Angular Momentum simple, need help understanding what to use.

  1. Nov 6, 2007 #1
    Here are seven particles each with the same magnitude of momentum || = 26 kg · m/s but with different directions of momentum and different positions relative to location A. The distances shown in the diagram have these values: w = 16 m, h = 24 m, and d = 23 m.


    [​IMG]

    Calculate the z component of angular momentum LAz for each particle (x to the right, y up, z out of the page). Make sure you give the correct sign.

    (1) LAz = kg · m2/s
    (2) LAz = kg · m2/s
    (3) LAz = kg · m2/s
    (4) LAz = kg · m2/s
    (5) LAz = kg · m2/s
    (6) LAz = kg · m2/s
    (7) LAz = kg · m2/s


    I know LA = P X R...but i'm not sure what i should use for R? Thanks for your help!!
     
  2. jcsd
  3. Nov 6, 2007 #2

    Astronuc

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    Staff: Mentor

    I would assume one is trying to find the angular momentum with respect to A, so in that case, for each particle, R is the distance from point A to that particle.

    For particle 5, since the distance is zero, then L(5) = 0.
     
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