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Homework Help: Resultant Forces

  1. Dec 12, 2013 #1
    1. The problem statement, all variables and given/known data
    See Attachments for Figure and Given Variables

    2. Relevant equations
    R^2 = Fx^2 + Fy^2
    @=tan^-1 (Fy/Fx)

    3. The attempt at a solution
    I've already solved problem 1.22
    I just need help at Problem 1.23
    in problem 1.23
    given the resultant as 4m/s, to the right
    I tried solving it
    4^2 = Fx^2 + Fy^2
    But i can't seem to proceed from here.
    I need help

    Attached Files:

  2. jcsd
  3. Dec 12, 2013 #2
    Try resolving the two vectors into components in the x and y directions. The sum of the x components has to equal 4, and the sum of the y components has to equal zero.
  4. Dec 12, 2013 #3
    sum of x = V1cos60 + v2cos30 = 4?
    sum of y = v1sin60+v2sin30 = 0?
    Corrent me if im wrong.
  5. Dec 12, 2013 #4
    The 2nd eqn. should have a minus sign. See the figure.

    Otherwise, great job.

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