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Homework Help: Problem involving dot and cross product

  1. Jul 31, 2015 #1
    1. The problem statement, all variables and given/known data

    https://www.dropbox.com/s/8l90hahznjlv9d0/vector problem.png?dl=0

    2. Relevant equations

    Dot and Cross product

    3. The attempt at a solution

    although I know the dot and cross product, I'm not sure what I'm being asked or how to proceed? any help?
  2. jcsd
  3. Jul 31, 2015 #2


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    Have you tried to turn it into a concrete example than generalizing it?

    The problem wants you to find a dot b and a cross b then use them to show the equation for a.
    Last edited: Jul 31, 2015
  4. Aug 1, 2015 #3


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    Do as the steps ask.
    In (a), take the dot product with ##\vec a## on each side of the given equation. What equation results? Then get that equation into the form ##\vec a.\vec b =##.

    The note at the end has a typo. Are you familiar with the equation that was intended?
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