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Math Help - finding the norm of a scalar product

  1. #1
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    finding the norm of a scalar product

    I jus had a quick question. in my study guide I am asked to find the norm of a scalar product? this would simply be |3V|? where im actually getting the magnitude of the scalar? is this what the question is asking me to do? I jus wanted to make sure i had it right.

    and i had one more question, the next question is asking me to find the magnitude of the projection. so could i write this representation as follows? |proj of j onto u| =
    |(u dot j/|v|^2) U|? thanks in advance.
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  2. #2
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    Quote Originally Posted by slapmaxwell1 View Post
    I jus had a quick question. in my study guide I am asked to find the norm of a scalar product? this would simply be |3V|? where im actually getting the magnitude of the scalar? is this what the question is asking me to do? I jus wanted to make sure i had it right.
    Yes, that is correct. If \alpha is a scalar and V is a vector then the norm of \alpha V is |\alpha V| which is also equal to |\alpha||V|.

    and i had one more question, the next question is asking me to find the magnitude of the projection. so could i write this representation as follows? |proj of j onto u| =
    |(u dot j/|v|^2) U|? thanks in advance.
    I'm not sure I understand your notation. Is U the same as u? What is j? I think perhaps you meant |(u dot v/|v|^2)u|
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  3. #3
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    sorry about that i did screw up the notation a bit, and i got the problem wrong on my test because of it. i will post the problems i got wrong this evening. thanks for your help with the other problems..I got an A on my first exam!!! :O)
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