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Homework Help: Vector problem -- Find the angle between vector A and vector B

  1. Jan 3, 2018 #1
    1. The problem statement, all variables and given/known data
    Vector A + Vector B + Vector C = 0
    A=B+C

    2. Relevant equations
    Find the angle between vector A and vector B

    3. The attempt at a solution

    I tried to solve this problem by resolving all the vectors and individually equating the value of vectors at each axes x, y and z to 0 but got nowhere with it.

    Please give a hint instead of solving the entire question.
     
  2. jcsd
  3. Jan 3, 2018 #2

    berkeman

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    Staff: Mentor

    Please type out your work so far.
     
  4. Jan 3, 2018 #3
    I got the answer by using a different approach.
     
  5. Jan 3, 2018 #4
    15149945295961041157075.jpg
    Here is my solution
     
  6. Jan 3, 2018 #5

    scottdave

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    It looks like you figured it out.
     
  7. Jan 3, 2018 #6

    Ray Vickson

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    Why would you post a sideways image? I will not lie down on my desk in order to read your work.

    Anyway, the PF standard is to type out your work, not to post images of it, unless that is unavoidable, such as when you include diagrams, etc.
     
  8. Jan 4, 2018 #7
    Sorry, would keep that in mind next time I ask a question. Thank you.
     
  9. Jan 4, 2018 #8

    scottdave

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    You did more than some. Some people make no attempt or simply state "I have no clue".
    I realize that it is easy to snap a picture, especially if you have already worked it out on paper. But keep in mind ways to maximize the amount of help you can get. When I am on my phone, I will usually skip participating if a major part of the post is an image. Usually, it is too small for me to make out what is in the image.
     
  10. Jan 4, 2018 #9
    Thank you! Would try to avoid that next time. :)
     
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