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Need help with this homeowork

  1. Oct 4, 2013 #1
    1. The problem statement, all variables and given/known data
    Vector A has a magnitude of 9.10 and is directed at 55.0 degrees. Vector B has a magnitude of 12.5 and is directed at 125 degrees . The x component of vector C is 8.60. The vectors are related by the equation A-2B=pC, where p Is a scalar. Find the value of p , the y component of C and the magnitude and the direction of vector C


    2. Relevant equations
    x component = Acos(O)
    y component = Asin(O)
    magnitude = squaroot of x^2 +y^2
    direction =arctan(y/x)


    3. The attempt at a solution
    i tried to attempt on this problem and got
    p=-1.06
    Cy=-26.4
    |C| = 27.8
    C direction = 361.9 degrees, not sure if i am right
     
    Last edited: Oct 5, 2013
  2. jcsd
  3. Oct 4, 2013 #2
    Ok. I think you need to break this up into steps. First, calculate the x-component for A and B. Then, use what you know to solve for p. After that, you can figure out the rest of C.
     
  4. Oct 5, 2013 #3
    i tried to attempt on this problem and got
    p=-1.06
    Cy=-26.4
    |C| = 27.8
    C direction = 361.9 degrees, not sure if i am right
     
  5. Oct 5, 2013 #4

    SteamKing

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    direction = square root of x^2 + y^2? Where did you get this equation?

    Hint: what is the magnitude of a vector in terms of its components?
     
  6. Oct 5, 2013 #5
    Oops , I am sorry , square root of x^2 + y^2 would be a formula of the magnitude . Direction = arctan(y/x).
    Like i said , i have tried to attempt on this problem already and i got some answers on the #2 post above. I am not sure that if those are right the right answers or not. Can someone confirm the answers for me please?
     
  7. Oct 5, 2013 #6

    haruspex

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    It's a lot easier for those trying to help if you post all your working, purely symbolically, only substituting numbers at the end.
     
  8. Oct 5, 2013 #7
    so here is what i got
     

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