Results 1 to 3 of 3

Math Help - Perpindicular vectors questions

  1. #1
    Newbie
    Joined
    Mar 2009
    Posts
    7

    Perpindicular vectors questions

    Hi all,

    I have (what I think is) a relatively simply calculus question: I am trying to find the unit vector u when I know that it is perpendicular to both v=i-2j+3k and w=2i+j-k.

    If anyone has any insight, I'd greatly appreciate it. Thanks!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    o_O
    o_O is offline
    Primero Espada
    o_O's Avatar
    Joined
    Mar 2008
    From
    Canada
    Posts
    1,407
    Let \vec{c} be the vector that results from taking the cross product of both \vec{v} and \vec{w}.

    Recall that \vec{c} \perp \vec{v} and \vec{c} \perp \vec{w}.

    All that remains is to simply use the formula: \hat{c} = \frac{\vec{c}}{||\ \vec{c} \ ||}
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor

    Joined
    Aug 2006
    Posts
    18,395
    Thanks
    1481
    Awards
    1
    u = \frac{{v \times w}}<br />
{{\left\| {v \times w} \right\|}}
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 3
    Last Post: November 15th 2011, 05:10 PM
  2. Replies: 1
    Last Post: October 26th 2009, 03:36 PM
  3. A line perpindicular to an equation
    Posted in the Pre-Calculus Forum
    Replies: 7
    Last Post: January 17th 2009, 02:51 PM
  4. If lines are perpindicular or parallel
    Posted in the Pre-Calculus Forum
    Replies: 7
    Last Post: March 27th 2008, 08:48 PM
  5. Replies: 3
    Last Post: March 2nd 2008, 05:00 PM

Search Tags


/mathhelpforum @mathhelpforum