Help with Project!

Discussion in 'Odds & Ends' started by USCfan, Mar 4, 2005.

  1. USCfan

    USCfan Professional

    Joined:
    Dec 29, 2004
    Messages:
    815
    Is anyone familiar with vectors?

    Here's my problem: I have a position vector r, and the 2nd derivative = [-GM/(abs.value of r)cubed] x r.

    According to my textbook, this means the second derivative is a scalar multiple of r, and therefore:

    the 2nd derivative of r x r = 0

    Can anyone explain this to me? Is it some rule dealing with vectors?
    This is really urgent... I would appreciate any help. I could email you a copy of my prject, if you don't understand what I am trying to say.
     
    #1
  2. battousai555

    battousai555 Rookie

    Joined:
    Dec 5, 2004
    Messages:
    107
    Well, if you use the law of sine, cosine, and tangent all at once and multiply by the square root of a piece of pie divided by the atomic mass of adamantium this should give you whatever you asked.
     
    #2
  3. fretstain

    fretstain New User

    Joined:
    Feb 27, 2005
    Messages:
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    could you email it to me? the_damn_echeverria@gmail.com? I haven't done this type of thing in a while but I'd like to see if I can make sense of it anyway
     
    #3
  4. USCfan

    USCfan Professional

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    fretstain,
    I emailed you.
     
    #4
  5. Power Game

    Power Game Professional

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    Jun 30, 2004
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    I think I can do this... I'll talk to you later
     
    #5
  6. fretstain

    fretstain New User

    Joined:
    Feb 27, 2005
    Messages:
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    for some reason it seems that my email address isn't working... could you give a better description here?
     
    #6
  7. Bigmal87

    Bigmal87 Guest

    who'd have thought so many maths geniuses all in one thread
     
    #7

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