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Moment vector expression to magnitude of moment

  1. Mar 13, 2012 #1
    1. The problem statement, all variables and given/known data
    find the magnitude and angle of the moment

    moment=-2.8i-1.53j+2.24k

    force tension=2.4 kN


    2. Relevant equations
    rxf=rfsin(theta)


    3. The attempt at a solution
    i used the cross product to get i j and k
    tried sin and cos of vectors but didnt work.
    inverse tan of vectors wont give close to correct angles
     
    Last edited: Mar 13, 2012
  2. jcsd
  3. Mar 13, 2012 #2

    cepheid

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    Welcome to PF!

    As far I as I can tell, the first part of the question is simply asking what the magnitude of the given vector is. You have all three components of the vector.

    What is the expression for the magnitude of a vector in terms of its components?
     
  4. Mar 13, 2012 #3
    I have no idea. The last time i did vectors at least six months ago.
     
  5. Mar 13, 2012 #4
    nevermind you square them all, add them, then take the square root.
     
  6. Mar 13, 2012 #5

    cepheid

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    Yeah.
     
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