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Homework Help: Equilibrium problem help please

  1. Apr 14, 2004 #1
    A uniform horizontal bar of length L = 3 m and weight 232 N is pinned to a vertical wall and supported by a thin wire that makes an angle of theta = 35o with the horizontal. A mass M, with a weight of 355 N, can be moved anywhere along the bar. The wire can withstand a maximum tension of 537 N. What is the maximum possible distance from the wall at which mass M can be placed before the wire breaks?

    I believe that this is an equilibrium problem, my problem is that i don't know where to start.

    Any help would be appreciated.
  2. jcsd
  3. Apr 15, 2004 #2


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    Homework Helper

    This is a static equilibrium problem. There are both rotational and translational considerations. The point pinned to the wall gives a constraint force. The wire gives a force at a moment. The weight of the bar gives a force about a moment. The weight of the mass M gives a force about a moment. Consider rotational equilibrium about the point pinned to the wall.

    Draw a free body diagram.
  4. Apr 15, 2004 #3
    I got this one, forgot I asked for help. Thanks!
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