Results 1 to 2 of 2

Math Help - Vector Q - Help Needed!!

  1. #1
    Newbie
    Joined
    Sep 2007
    Posts
    3

    Vector Q - Help Needed!!

    Hey... I am having a bit of difficulty with the following question, can someone help me out please?

    If V1 = ai(hat) + bj(hat) and V2 = bi(hat) and aj(hat)

    1) Write down unit vectors in the V1 and V2 directions

    2) Show that cot(theta) = 2ab/(a^2 - b^2) (denominator modulus), where theta is the angle between the two vectors.

    Sorry, it seems difficult when you have to type the maths instead of writing it out! I'd really appreciate the answers, and how you got to them, so I know for next time... thank you!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,712
    Thanks
    1642
    Awards
    1
    For any vector v \not= 0 the vector \frac{v}{{\left\| v \right\|}} is a unit vector in the direction of v.

    For the second use the law of cosines.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 8
    Last Post: January 11th 2011, 10:17 AM
  2. Simple eigen value / vector problem needed
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: October 20th 2010, 04:48 AM
  3. Replies: 2
    Last Post: October 5th 2009, 03:25 PM
  4. Vector Help Needed
    Posted in the Calculus Forum
    Replies: 2
    Last Post: June 9th 2009, 06:35 AM
  5. Vector proofs urgent help needed
    Posted in the Calculus Forum
    Replies: 2
    Last Post: October 28th 2008, 03:00 PM

Search Tags


/mathhelpforum @mathhelpforum