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Can you please help me with this high school problems? About projectile motion

  1. Nov 20, 2008 #1
    1. The problem statement, all variables and given/known data

    I just did this question, and I just want to make sure I did it right... Can u run through it and notify me of any errors?


    2. Relevant equations

    Here is the question:
    http://i299.photobucket.com/albums/mm286/lanvin12/333-1.jpg

    3. The attempt at a solution

    this is what I did...

    V(x) = V(bx) - V(ax) = [ (4.4m/s) sin 31° ] - [ (7.8m/s) sin 25° ] = 1.030262m/s

    V(y) = V(by) + V(ay) = [ (4.4m/s) cos 31° ] - [ (7.8m/s) cos 25° ] = 10.840736 m/s

    V² = V(x)² + V(y)² = 10.8² + 1.03² + 118.5
    V = √118.5 = 10.88

    A = V / t = 10.88 / 8.55 = 1.28m/s²


    tan theta = 10.84 / 1.030 = 10522
    theta = tan^(-1) 10.52230 = 84.57°

    therefore, the bird's acceleration was 1.3 m/s² [85° S of E]

    is that right? Was I supposed to use TOA? Significant digits ok?
    Any mistakes...?
     
  2. jcsd
  3. Nov 20, 2008 #2
    I don't think it is right that the average acceleration is 85o S of E. If that is the case, wouldn't the bird be flying south now?
     
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