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icecats
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Homework Statement
I am working on the derivation of Kepler's Second Law based on torque and angular momentum. I understand that the vector "L" is equal to the mass (m) times the cross product of the vector "r" and the vector "v." The source I am following then states that
L = mrvtheta. I do not understand how the source is deriving this from the cross product. This is shown in the second to last step on this web page.
Homework Equations
L= r cross p
The Attempt at a Solution
I am able to get to the point of computing the cross product, but no further. In other words, I have completed the algebra to arrive at L= m(r cross v).