Results 1 to 5 of 5

Math Help - Find the points where orthogonal

  1. #1
    Newbie
    Joined
    Sep 2012
    From
    Corvallis, OR
    Posts
    24

    Find the points where orthogonal

    Consider the helix r(t) = <cost, sint, t> for [-inf, inf]. Find all points on the helix at which r and r' are orthogonal
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Behold, the power of SARDINES!
    TheEmptySet's Avatar
    Joined
    Feb 2008
    From
    Yuma, AZ, USA
    Posts
    3,764
    Thanks
    78

    Re: Find the points where orthogonal

    Quote Originally Posted by jessicadowning View Post
    Consider the helix r(t) = <cost, sint, t> for [-inf, inf]. Find all points on the helix at which r and r' are orthogonal
    Well if we take the derivative we get

    r'(t)=<-\sin(t), \cos(t), 1>

    Two vectors are orthongal is their dot product is equal to zero, so....

    Can you finish from here?

    By the way how is Corvallis? I miss it alot. I would kill for Tarn Tip Thai about now.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    MHF Contributor
    Joined
    Sep 2012
    From
    Australia
    Posts
    3,607
    Thanks
    591

    Re: Find the points where orthogonal

    Hey jessicadowning.

    Can you compute r'(t)? When are two vectors orthogonal? (Hint: it has something to do with something being 0)
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Sep 2012
    From
    Corvallis, OR
    Posts
    24

    Re: Find the points where orthogonal

    Yeah, I got it from there, thanks so much!
    And Corvallis is great, I'm loving it so far! (I'm a freshman, lol)
    I haven't heard of Tarn Tip Thai, but it sounds good, I'll have to try it! :)
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Behold, the power of SARDINES!
    TheEmptySet's Avatar
    Joined
    Feb 2008
    From
    Yuma, AZ, USA
    Posts
    3,764
    Thanks
    78

    Re: Find the points where orthogonal

    Quote Originally Posted by jessicadowning View Post
    Yeah, I got it from there, thanks so much!
    And Corvallis is great, I'm loving it so far! (I'm a freshman, lol)
    I haven't heard of Tarn Tip Thai, but it sounds good, I'll have to try it!
    It is on Monroe on the North side of campus, it is inexpensive and they have good food. It is cash only so be prepared!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 2
    Last Post: October 5th 2012, 03:55 PM
  2. Replies: 3
    Last Post: August 1st 2012, 11:03 PM
  3. Find the orthogonal complement
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: April 12th 2010, 11:18 AM
  4. [SOLVED] Find vector orthogonal to two points
    Posted in the Advanced Algebra Forum
    Replies: 2
    Last Post: March 4th 2010, 01:08 PM
  5. Replies: 2
    Last Post: September 4th 2009, 10:19 PM

Search Tags


/mathhelpforum @mathhelpforum