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Whats the magnitude of the velocity of the wind

  1. Oct 19, 2005 #1
    A passenger on a ship traveling due east with a speed of 13.38m/s observes that the stream from the ship's funnels make an angle 20 (degrees) with the ships wake. The wind is blowing from south to north. Assume the smoke acquires a velocity(with respect to the earth) equal to the velocity of the wind as it leaves the funnels. Whats the magnitude of the velocity of the wind.
     
    Last edited by a moderator: Sep 14, 2015
  2. jcsd
  3. Oct 19, 2005 #2

    Tom Mattson

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    OK, so how did you start, and where did you get stuck?

    You have to show your work here.
     
  4. Oct 19, 2005 #3
    alright so the forumal X=distance after object accelerates for time
    X0=initial distance
    v=velocity after object accelerates for time
    V0=initial velocity
    a=acceleration
    t=time
    v=v0+at
    x=x0+v0t+1/2at 2 squared
    plunging it in is where iam stuck
     
  5. Oct 19, 2005 #4

    Tom Mattson

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    You're just randomly grabbing equations, which won't do. First of all you've got to recognize that this is a two dimensional motion problem. And the second thing is that this is a relative motion problem.

    Let [itex]\vec{V}_{SE}[/itex] be the velocity of the ship relative to the Earth.
    Let [itex]\vec{V}_{WE}[/itex] be the velocity of the wind relative to the Earth.
    Let [itex]\vec{V}_{WS}[/itex] by the velocity of the wind relative to the ship.

    First question: How are these three quantities related?
     
  6. Oct 19, 2005 #5

    Tom Mattson

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    Lisa: For the last time, stop posting your question all over the site.

    You have to work with us. We are not going to do this problem for you.
     
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