Results 1 to 1 of 1

Math Help - 10 points for a FULL explaination and answer to this vector question. Urgent?

  1. #1
    Newbie
    Joined
    Feb 2010
    Posts
    4

    Full explaination and answer to this trigonometric question

    A ship sailing due north at a speed of 20km/h observes another ship which appears, to those on the first ship, to be travelling north-west at 10km/h. Draw a diagram and find the true speed and direction of motion of the second ship.

    This is the explanation that I have been given and that I do not fully understand

    Let the 1st ship be A the second ship be B and
    ship B is actually travelling at v km/h in the direction
    of N x* W. Then
    v^2=10^2+20^2-2(10)(20)cos(45+90)*=>
    v^2=641.4213562=
    v=25.3263 km/h approximately.
    10/sinx=25.3263/sin(90+45)*=>
    x=16*12'44.5"
    So the second ship (B) is travelling at 25.3263 km/h
    in the direction N 16*12'44.5" W.
    Last edited by lolz; March 5th 2010 at 12:18 PM.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Probability question explaination
    Posted in the Statistics Forum
    Replies: 3
    Last Post: April 24th 2011, 10:53 AM
  2. Full Width Half Max question??
    Posted in the Calculus Forum
    Replies: 1
    Last Post: May 16th 2010, 03:22 AM
  3. [SOLVED] Full Binary Tree Question
    Posted in the Discrete Math Forum
    Replies: 3
    Last Post: May 12th 2010, 06:22 PM
  4. Replies: 2
    Last Post: February 7th 2009, 11:31 PM
  5. Replies: 1
    Last Post: September 2nd 2007, 04:08 AM

Search Tags


/mathhelpforum @mathhelpforum