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Vector Help. Calc based Physics 1

  1. Jan 21, 2008 #1
    1. The problem statement, all variables and given/known data

    Rank from largest to smallest:
    2i+7j-4k , 3i+j-k , 7i - 2j +4k , 4i + 7j - 3k
    Explain please

    2. Relevant equations



    3. The attempt at a solution
    Don't understand how and what to look for


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

    A receiver starts at +2i - 3j with the units being expressed in yards. i is the the right and j is downfield. The receiver goes +9.0i +12j , -6i +4.0j , +12.0i + 18j and the quarterback drops back -7.0j.
    How far must the quarterback throw the ball?
    In which direction must the quarterback throw the ball? In degrees


    2. Relevant equations



    3. The attempt at a solution
    I have drawn it and the 2 answers I came up with are 41 and 38 yards. Neither are right. I don't know how to find the angle.

    1. The problem statement, all variables and given/known data
    Ax = +5.7 Bx = -9.8
    Ay = -3.6 By = -6.5

    The magnitude of the vector difference , is closest to:
    16,11,250

    3. The attempt at a solution
    I have tried 5 and -5 and right now looking at my paper I forgot the equation I used but it must have been wrong
     
    Last edited: Jan 21, 2008
  2. jcsd
  3. Jan 21, 2008 #2

    Shooting Star

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    Homework Helper

    Q1. These are vectors. Vectors have magnitudes and directions. On what basis do you think they should be arranged?

    Q2. Vector displacement of ball = Recvr's posn vector - Qbacks's posn vector. How do you find the magnitude and angle with the, say x-axis, of a Cartesian vector?

    Q3. Vector A = Axi + Ayj etc. Subtract and find the magnitude of the resulting vector.
     
  4. Jan 21, 2008 #3
    Q1. [tex]|v| = \sqrt{x^2+y^2+z^2}[/tex] It's fairly easy to prove if you don't believe me.
     
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