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Homework Help: Speed and Direction

  1. Oct 30, 2011 #1
    I am having a lot of trouble with my physics homework and any help would be great.

    I thought I maybe had to subtract the wind from what I need to travel, but that didn't get me an answer that made any sense, plus I didn't know what to do with the angle. I looked in the book and couldn't find anything, but the chapter is called Vector Addition, so I am assuming at some point I am supposed to add vectors. Any help with how to solve this would be super helpful, please and thank you.

    The Molko's fly from airport A to airport B. They need to travel 717 km/h, 2.64 degrees West of South. The wind is blowing east at 102 km/h. What speed and direction must the plane travel to get there?
    Last edited: Oct 30, 2011
  2. jcsd
  3. Oct 30, 2011 #2


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    Homework Helper

    Start by drawing a diagram! You know the wind vector. The airspeed vector is unknown. But the two must add up to a groundspeed vector in the direction of airport B. If you can write that mathematically, you can solve it for the direction to aim the plane!
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