Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Unit vector help please.

  1. Sep 18, 2011 #1
    1. The problem statement, all variables and given/known data

    use unit vectors to express the vector C where C=3.00A-4.00B
    the answer is apparently C=12.0i + 14.9j

    2. Relevant equations

    cross product

    3. The attempt at a solution

    i have no idea where to even start how is it possible to find the i orj because i dont even know the components of A or B
     
  2. jcsd
  3. Sep 18, 2011 #2
    To find the unit vector you're going to have to divide each component of the vector by the magnitude of the vector.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook