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Homework Help: Dot Product Rules Multiple choice

  1. Sep 18, 2010 #1
    1. The problem statement, all variables and given/known data
    See the image
    http://tinypic.com/r/33z6vz5/7

    2. Relevant equations
    The rules of dot product multiplication.


    3. The attempt at a solution
    I've determined that 2 of the solutions are valid, while two of the choices are invalid. I thought C and D looked correct, making A and B incorrect. Unfortunately it wasn't so. I'm down to my last submission and I really don't know what I'm doing wrong.

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



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Sep 19, 2010 #2

    vela

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    Staff Emeritus
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    Why do you think the answers are valid or invalid? You need reasons better than an answer "looked correct."

    Hint: What type of quantity, vector or scalar, is the dot product of two vectors?
     
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