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Homework Help: What is the speed of the wind?

  1. Sep 30, 2005 #1
    An aircraft heads due south with a speed relative to the air of 44m/s Its resultant speed over the ground is 47 m/s The wind blows from the west. A) What is the speed of the wind? B) What is the direction of the aircrafts path over the ground?

    I figured out a, 16.5 but i don't even know where to start when it comes to b except i know i need to use law of sines or law of cosines...HELP please
  2. jcsd
  3. Sep 30, 2005 #2
    PLEASE help me ive been working on this problem for hours
  4. Sep 30, 2005 #3


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    Homework Helper

    The velocities as vectors: vy = -44j. vx = ai
    v = vy + vx
    |v| = 47

    Draw a diagram, and you should be able to easily solve the angle, as vx and vy are perpendicular.
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