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Homework Help: Silly question about Cross-Product

  1. Mar 3, 2008 #1
    I just forget the rule here.

    I am finding angular momentum by using r x mv

    If I am using the determinant to evaluate r cross v, where does the mass come in? Do I just mulyiply the result of r cross v by m?

    Or do I distribute m to my vector v and then use those values inside the determinant?
  2. jcsd
  3. Mar 3, 2008 #2


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    Science Advisor
    Homework Helper

    It doesn't matter. m is just a number, so
    r x (m v) = (m r) x v = m (r x v)
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