Results 1 to 2 of 2

Math Help - Adding vectors. Angle of vector or resultant

  1. #1
    Newbie
    Joined
    Mar 2011
    Posts
    5

    Adding vectors. Angle of vector or resultant

    Could someone please try and explain to me how to interpret the angle of the resultant when adding or subtracting 2 vectors? I do not have any trouble in using the cosine law to calculate the magnitude of the resultant or the sine law to determine the various angles, but I cannot understand how to interpret the angle of the resultant, using either a true bearing or a quadrant bearing.

    I've searched these forums but the concept is still not cleared up in my mind. For example in this thread http://www.mathhelpforum.com/math-he...or-147360.html
    I cannot understand how the original poster's answer of N59.1degreesW ties into the respondent's figures of "42 degrees East of North" or further on in the post "The angle is given by [tex]tan^{-1}(27.36}{50.17}= 28.6 degrees".

    Also in this thread http://www.mathhelpforum.com/math-he...elp-28555.html
    In earboth's diagram and explanation I understand how he calculated the 58.666 degrees between the black line and the red line but I do not understand how that ties in to the direction the wind is blowing being "206.666 degrees or S26.666W" according to earboth (although I do understand the translation from 206.666 degrees to S26.666W)

    Adding vectors. Angle of vector or resultant-math_image.png




    I feel there is a basic hole in my understanding of vector direction that is preventing me from being able to interpret these directions.

    Is there a simple way to figure out the direction or is it something a little more complicated?

    Any help would be much appreciated. If you can see what I am misinterpreting I would very much appreciate if you could throw some light on it for me. Any explanation on the subject would be welcome even if it does not refer to the linked threads.

    Sorry if the answer is very obvious.

    Thank you.

    bdika
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    12,044
    Thanks
    885
    Quote Originally Posted by bdika View Post
    Also in this thread http://www.mathhelpforum.com/math-he...elp-28555.html
    In earboth's diagram and explanation I understand how he calculated the 58.666 degrees between the black line and the red line but I do not understand how that ties in to the direction the wind is blowing being "206.666 degrees or S26.666W" according to earboth (although I do understand the translation from 206.666 degrees to S26.666W)

    Image from Vector Help!!!!
    quoting earboth from your linked thread ...

    Now calculate the direction from which the wind is blowing.
    by convention, wind direction is usually given as the direction the wind is coming from, not blowing towards.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. vector resultant
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: September 13th 2010, 08:24 AM
  2. Resultant vectors
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: February 26th 2010, 09:49 PM
  3. resultant between two vectors
    Posted in the Calculus Forum
    Replies: 1
    Last Post: February 4th 2010, 07:41 PM
  4. Replies: 2
    Last Post: September 30th 2008, 03:28 PM
  5. resultant vectors
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: April 3rd 2008, 04:49 PM

Search Tags


/mathhelpforum @mathhelpforum