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Trucks travels beneath an airplane .

  1. Oct 15, 2012 #1
    trucks travels beneath an airplane.....

    1. The problem statement, all variables and given/known data

    A truck travels beneath an airplane that is
    moving 180 km/h at an angle of 39 to the
    ground. How fast must the truck travel to stay be-
    neath the airplane? What is the magnitude of the vertical component of the velocity of the plane? Answer in units of km/h

    2. Relevant equations

    My physics teacher said the question is identifying the horizontal and vertical components. So I had to do Vcostheta and Vsintheta.

    3. The attempt at a solution

    Vcostheta=180cos39=139.8863 km/h
    vsintheta=180sin39=113.2777 km/h

    my problem is, I don't understand which direciton the vectors are. Is it going north of east or south of east, or what? I can't identify them in the problem and I can't tell if the answers need a negative sign or positive sign.
     
  2. jcsd
  3. Oct 15, 2012 #2

    Dick

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    Re: trucks travels beneath an airplane.....

    The problem is only asking you questions like "How fast" and "magnitude of". Those are questions where the answer is always positive. You can pick a direction for things to be travelling in if it helps you picture things but it shouldn't affect your answer.
     
  4. Oct 15, 2012 #3
    Re: trucks travels beneath an airplane.....

    ohh ok. i see. thanks :)....i have another question from my hw......is it ok to ask it on this same thread?
     
  5. Oct 15, 2012 #4

    Dick

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    Re: trucks travels beneath an airplane.....

    Its ok. But it will probably get more attention if you post it in a new thread.
     
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