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Homework Help: Forces and laws of motion worksheet-newtons first law

  1. Nov 9, 2008 #1
    1. The problem statement, all variables and given/known data


    this is the link to the worksheet im having trouble with. if anyone could help me out that would be great. i got most of it but have a few questions.

    2. Relevant equations
    fy=sin(angle) x force
    fx= cos(angle) x force
    fnet = √(fy^2 + fx^2)

    3. The attempt at a solution
    1.) F1 + F2 + F3
    2.) String 1: x component:0
    y component: -Fg
    String 2 x component: -F2cos(theta1)
    y component: F2sin (theta1)
    String 3: x component: F3cos(theta2)
    y component: F3sin(theta2)

    Number 3 is what im having trouble with. i know that the Fx net is:
    √0+xcomponent String2^2+x component String3^2)
    but im not sure about the y component. is it just the sqrrt of the sums of the squares of the three ycomponenents? or am i missing something?
    oh and i think i can do #4 without a problem.

    so can someone check my work and make sure its right and help me with #3? thanks!
  2. jcsd
  3. Nov 9, 2008 #2
    1) It's in equilibrium...

    2) 0, [tex]F_1=m\textbf{g}[/tex].

    3) It's in equlibrium in both directions...

    4) Sweet.
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