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Homework Help: Vector addition picture

  1. Jun 23, 2015 #1
    1. The problem statement, all variables and given/known data
    FC of magnitude 188 N. Note that the direction of FC is not given. What is the magnitude of Betty's force FB if Charles pulls in (a) the direction drawn in the picture or (b) the other possible direction for equilibrium

    2. Relevant equations

    3. The attempt at a solution
    Im having trouble with part b) of the question. I dont know what other possiblities there are.
  2. jcsd
  3. Jun 23, 2015 #2


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    Gold Member

    I can't see any of your images. Are they embedded or linked?
  4. Jun 23, 2015 #3
  5. Jun 23, 2015 #4
    B has no horizontal component so you need to find at which angle (other than the one you originally found) the horizontal component of C is exactly opposite to the horizontal component of A. Such an angle is guaranteed to exist (think of the graph of cosine).
  6. Jun 23, 2015 #5
    oh its so obvious now thanks
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