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Homework Help: HELP Statics problem

  1. Nov 25, 2008 #1
    HELP!!!Statics problem

    1. The problem statement, all variables and given/known data
    A thin rod AB of length L=0.5m and mass m=1.0kg makes an angle of theta=60 degree with the horizontal. It is held in position by a horizontal light string attached at A as shown. A mass M is suspended from A by a second string. If the coefficient of friction between the rod and the ground at the point of contact B is mu(s)=0.50, what is the largest mass M that can be suspended such that the rod does not slip.

    3. The attempt at a solution
    we need to use the equilibrium conditions to solve the problem. therefore, Sigma(Fx)=0,Sigma(Fy)=0 and Sigma(torque)=0
    therefore, normal force=mg=1*9.8=9.8N
    Sigma(Fx)=frictional force-exerted force=0
    this is what I know for solving the problem so far...I know that I have to somehow relate the rod with the hanging mass.
    Ignoring the ways I attempted above, I think that i can get the mass by
    but I think it is not the correct answer.
    Can anyone help me with it? thank you very much.
    Last edited: Nov 25, 2008
  2. jcsd
  3. Nov 25, 2008 #2
    Re: HELP!!!Statics problem

    hmm, the forum seems to have some issues with generating certain latex input, I can't read half your post,

    I wonder if there is a thread on latex forum input tips
  4. Nov 25, 2008 #3
    Re: HELP!!!Statics problem

    I have change the format, I think that you will be able to view it without any problem.
  5. Nov 26, 2008 #4
    Re: HELP!!!Statics problem

    first pretend there is no friction and that the thing is just anchored. put down two equations one for forces in the x direction and for forces in the y direction. I called the tension in the string T1 and tension in the rod T2
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