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Resolved part of vector r

  1. Jun 16, 2009 #1
    1. The problem statement, all variables and given/known data

    Write down the resolved part of vector r in the direction of a, where [itex]a=\left(
    \begin{array}{c}
    0 \\
    0 \\
    -1
    \end{array}
    \right)[/itex]

    EDIT:
    [itex]
    r=\left(
    \begin{array}{c}
    3 \\
    4 \\
    5
    \end{array}
    \right)[/itex]
    3. The attempt at a solution

    I don't know what this means, the resolved part of vector r.
     
  2. jcsd
  3. Jun 16, 2009 #2

    Mark44

    Staff: Mentor

    I don't either, but I suspect it has something to do with the component of r in the direction of a. See if your textbook defines the term "resolved part of a vector" somewhere.

    Mathematics relies heavily on definitions. Whenever you have a problem that says "find the XYZ" and you don't know what XYZ is, look for its definition and go from there.
     
  4. Jun 16, 2009 #3
    The answer is just '-5'. The text doesn't define it anywhere its a really crap text. The questions are from past papers from different exam boards.
     
  5. Jun 16, 2009 #4

    Cyosis

    User Avatar
    Homework Helper

    To add to what Mark said. If I don't know a definition and I am behind my pc, I use google. More often than not I will know the meaning of the definition in mere seconds.

    I tried it for this problem as well and the first hit was:

    http://thesaurus.maths.org/mmkb/entry.html?action=entryById&id=3779 [Broken]

    Five seconds at most!

    And yes the answer is -5.

    I don't want to discourage you from asking questions of course, but being somewhat independent will save you a lot of time which you can spend on more important things!
     
    Last edited by a moderator: May 4, 2017
  6. Jun 16, 2009 #5

    tiny-tim

    User Avatar
    Science Advisor
    Homework Helper

    Yes, it's a bit old-fashioned now, but some people say "resolve all the forces in the x-direction" when they mean "find the components of all the forces in the x-direction" …

    it's using one word instead of two or three. :wink:
     
  7. Jun 16, 2009 #6
    This in the formula book :)
     
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