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When doing Angular Momentum

  1. Mar 26, 2009 #1
    When doing Angular Momentum, how is it that 2.0(2.12i + 2.12j) x (-3.863i - 1.035j) is equal to 2.0[-2.194k + 8.189k]?
     
  2. jcsd
  3. Mar 26, 2009 #2

    tiny-tim

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    'cos i x j = k and j x i = -k (and ii = jj = 0) :wink:
     
  4. Mar 26, 2009 #3
    I don't understand.

    cos i x j = k ?

    So cos 2.12i x 2.12j = -2.194k ?

    Please explain it in numbers. How do I get -2.194k + 8.189k ?
     
  5. Mar 26, 2009 #4

    tiny-tim

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    he he :rofl:

    no, I meant because i x j = k :wink:
     
  6. Mar 26, 2009 #5
    O! I get it! Thanks.
     
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