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Homework Help: Vectors and more vectors

  1. Sep 9, 2007 #1
    1. The problem statement, all variables and given/known data
    A certain vector in the xy plane has an x component of 4 and a y component of 10. It is rotated in the xy plane so its x component is doubled. Its new y component is about:
    A. 20

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Sep 9, 2007 #2


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    Homework Helper

    You must show some work. What do you know about vectors? Do you know how to find the magnitude?
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