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Static Equlibrium

  1. Sep 26, 2013 #1
    http://postimg.org/image/4ctmvwzx3/


    2. Relevant equations

    Ʃτ = 0
    ƩF = 0


    3. The attempt at a solution

    summing the torques for each piece, i found

    Ʃτ = MgLsin(90-ψ) - mgIsin(ψ) = 0

    MgLsin(90-ψ) = mgIsin(ψ)

    ML/mI = sin(ψ)/sin(90-ψ) = sin(ψ)/cos(-ψ) = tan(ψ)

    so ψ = tan-1(ML/mI)

    i don't know if this is correct or not...

    and I have no idea how I could find the angle without considering torque. any help is appreciated. thanks :)
     

    Attached Files:

  2. jcsd
  3. Sep 26, 2013 #2

    Simon Bridge

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    How could you go about checking it?

    I don't think you can. But you can do it without directly considering torque by using a result - like the lever equation.
     
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