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Math Help - vector problem

  1. #1
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    vector problem

    Given the following vectors: = 3.9 + 3.1, = 3.3 + 3.1, and = 2.5 + 8.3
    (a) Find the vector , in unit vector notation, such that + 2 - 2 + 2 = 0.
    +

    (b) Express your answer in part (a) in terms of magnitude and angle clockwise from the + x direction.
    at

    webassign continues to call me wrong on this and ive asked everyone i know and they get the same thing. help?
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  2. #2
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    oops didnt post the numbers.

    its -9.4 i and 4.2 j

    and the magnitude is 10.296

    the angle i got was 204.075
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  3. #3
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    D =  - 9.4i + 4.2j, this what MathCad gives as the answer.

    \left\| D \right\| = 10.296\,\& \,\phi  = \pi  + \arctan \left( {\frac{{ - 9.4}}{{4.2}}} \right) = {\rm{2}}{\rm{.721}} \approx {\rm{155}}{\rm{.925}}^ \circ
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  4. #4
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    well isnt that the angle COUNTERclockwise from the +x axis?
    it asks for clockwise, which is weird but my teacher is tricksy.
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  5. #5
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    Well try that to see if it works. It may be a missprint.
    Or try -204.075^o.
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  6. #6
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    hmm good point i suppose it could be a missprint.
    i only have one more submission though you only get three and i already used the first two on that answer ( i got frustrated and tried it twice).
    maybe ill just email my teacher.
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