# Angular Momentum simple, need help understanding what to use.

1. Nov 6, 2007

### quickclick330

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.

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. Nov 6, 2007

### 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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