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Homework Help: Vector Speed Problem

  1. Aug 27, 2009 #1
    1. The problem statement, all variables and given/known data

    A truck is moving north at a speed of 70 km/h. The exhaust pipe above the truck cab sends out a trail of smoke that makes an angle of 20 degrees east of south behind the truck. If the wind is blowing directly toward the east, what is the wind speed at that location?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Aug 27, 2009 #2


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    Homework Helper

    Welcome to PF!

    Hi bigk2331! Welcome to PF! :wink:

    (Velocities are vectors, and so obey the law of vector addition, so …)

    Draw a vector triangle …

    what do you get? :smile:
  4. Aug 27, 2009 #3


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    hello bigk2331, welcome to the PF

    what do you think the velocity of the smoke [despite the wind effect] and its direction?
    try to sketch the direction of the velocities mentioned in the problem, this is just a simple vector addition [put in mind the angle, so you can get the value needed]
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