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Homework Help: Parallel & Orthogonal

  1. Oct 30, 2009 #1
    1. The problem statement, all variables and given/known data

    For u=(26, 6, 21) and v=(−27, −9, −18) , find the vectors u1 and u2 such that:

    (i) u1 is parallel to v

    (ii) u2 is orthogonal to v

    (iii) u = u1 + u2

    2. Relevant equations


    3. The attempt at a solution

    I'm quite lost on this question and not sure how to even start. Can someone explain the question and give me some hints to get started?

    Thanks in advance.
  2. jcsd
  3. Oct 30, 2009 #2
    Are you sure that there are no relevant equations? What about those defining defining parallel and orthogonal?
  4. Oct 31, 2009 #3

    Gib Z

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    Homework Helper

    Drawing a diagram is always great.
  5. Oct 31, 2009 #4
    There aren't any other questions or equations about this. All I know is if their dot product is 0, then its orthogonal, and my book doesn't even mention parallel.
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