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Displacement Vector problem

  1. Sep 11, 2007 #1
    1. The problem statement, all variables and given/known data

    Each of the displacement vectors and shown in Figure P1.38 has a magnitude of 3.00 m. Find the following values graphically. Report all angles counterclockwise from the positive x axis.

    Figure P1.38
    [​IMG]
    (a) A+B=?
    magnitude m

    60°
    (b) A - B=?
    magnitude
    m

    °
    (c) B-A=?
    magnitude m


    (d) A- 2B
    magnitude m
    °





    2. Relevant equations

    C=A+B C=B+A C= A+ (-B) maybe X= mcos(theta) Y=msin(theta)

    3. The attempt at a solution

    Ive been working on this problem for long time now, these vector properties are confusing, so far i manage to come up with some diffrent ways to get the resulant for part A but i dont know if im doing it right. first thing i try to connect A to B but extending the tail towards the head of B, then i mesuared the resultant, but got wrong answer. Same thing when I went from B to A, I dont know if connecting them right. I really need some one to shine some light on this one. When I do extend to B from A it turns out to be a Eqaultrail triangle, so the angle must be 60 deg where it meets.
     
  2. jcsd
  3. Sep 11, 2007 #2

    learningphysics

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    Homework Helper

    If you draw the 3rd side of the triangle formed by the two sides you've drawn on the picture... ie draw a vector from the head of B to the head of A, what vector is that?
     
  4. Sep 12, 2007 #3
    turns out with the help of a niffty program, the resultant goes straight in the middle of the two vectors when you have A+B. This forms a pallrelagram with an angle of 60 deg at the end. I figure it out for myself, but I appreicate the response. I just stay with it for whole time, but sheer luck it started fitting together. I was able to answer all the parts.
     
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