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Homework Help: Simple Vectors Problem

  1. Sep 16, 2010 #1
    1. The problem statement, all variables and given/known data

    12. [1pt] The unit vector ř that points in the direction of r is given by ř =r/ |r|.
    If r = (-7.00)î + (7.00)ĵ find ř.

    b)What is the x component and the y component of ř?

    2. Relevant equations

    a^2 + b^2 = c^2

    3. The attempt at a solution

    I dont really understand what the equation is asking i cant seem to wrap my mind around it the farthest i got was

    ř = -7.00î + 7.00ĵ
    |-7.00î + 7.00ĵ|

    if anyone could help me out what to do or even understand the question it would be appreciated thanks
  2. jcsd
  3. Sep 16, 2010 #2


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    If you have a vector A=xi+yj, then |A|= √(x2+y2)
  4. Sep 16, 2010 #3


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    Well then you will have ř = 1/9.9 (-7.00î + 7.00ĵ)

    and if you have A=w(2i+j), this is the same as A=2wi+wj
  5. Sep 16, 2010 #4
    ohhhhhhhhh ok i got it lol im an idiot thanks
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