# Cross Product

1. Nov 13, 2011

### mrshappy0

1. The problem statement, all variables and given/known data
For the general case. I need help finding the cross product for the angular momentum. Say you have a particle at a position r= xi+yj+zk with a velocity of xi+yj+zk and a known mass. How do you find the angular momentum?

2. Relevant equations
L=mvr

3. The attempt at a solution

So I know how to find the cross product of r and v. It will be some xi+yj+zk. Then how do you find the angular momentum from there?

2. Nov 13, 2011

### RTW69

Do a Google search on cross product. Wikipedia will show you how.

3. Nov 13, 2011

### JHamm

Since angular momentum is $L = \vec{r} \times m\vec{v}$ and you know how to find $\vec{r} \times \vec{v}$ just multiply by m