1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Science Advisor
    Gold Member

    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.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook