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Homework Help: Rotational Equilibrium Homework Help

  1. May 22, 2013 #1
    1. The problem statement, all variables and given/known data

    Answers were told to us to be

    F = 2.91 N
    Ft1 = 13.32 N
    Ft2 = 3.36 N

    2. Relevant equations

    Fx = Ft2 cos(θ) - F = 0
    Fy = Ft2 sin(θ) + Ft1 - Fg = 0
    Torque equation

    -FgDg - Ft2D1x cos(θ) + Ft2D1y sin(θ) = 0

    3. The attempt at a solution

    I plugged in all of the information i had but did not get the right answer. I think my distances may be off but i cannot seem to get to those answers.
    Last edited: May 22, 2013
  2. jcsd
  3. May 22, 2013 #2


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    Science Advisor
    Homework Helper
    Gold Member

    That doesn't look right. The angle is to the horizontal, so cos(theta) should be giving a horizontal force component. That needs to be multiplied by a vertical distance. Pls post your working in detail.
  4. May 23, 2013 #3
    why not calculate torque from the nail then rotation is 0 and the picture can only rotate along the nail then FT1 being parallel to the line of action offers no torque only mg is balanced by FT2 the by that u can find the others
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