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!

Homework Help: 3D unit vector question

  1. Mar 7, 2010 #1
    I was given the question,

    If u=ai+2j+4k and v=3i+bj+k, calculate a and b
    in a textbook from school (revision for a test).

    Any thoughts?
  2. jcsd
  3. Mar 7, 2010 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    (Moderator's note: thread moved from "General Math")

    It looks like more information is needed to solve the problem. What are the constraints on u and v? Do they need to be parallel, or perpendicular, or something else? If they're just arbitrary vectors, a and b could be anything.
    Please give us yours first...:wink:
  4. Mar 7, 2010 #3
    No need! Done it.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook