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How to calculate vectors

  1. Jan 12, 2010 #1
    How can I calculate the following?
    Given A=[tex]\hat{x}[/tex](x+2y)-[tex]\hat{y}[/tex](y+3z)+[tex]\hat{z}[/tex](3x-y)
    Determine a unit vector parallel to A at point P(1,-1,2).
  2. jcsd
  3. Jan 12, 2010 #2


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    It's straight forward substitution. Find the vector A at the given point and then calculate the unit vector by scaling A by the inverse of its length (thus making the new vector's length one).
  4. Jan 13, 2010 #3
    I agree. By substitution A=-1i-5j+4z, The magnitude of A = Sqrt((-1)2+(-5)2+(4)2). Divide the magnitude into A to get the unit vector.
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