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Homework Help: Leaning Broom statics problem

  1. Nov 8, 2008 #1
    1. The problem statement, all variables and given/known data
    Image of problem: http://img227.imageshack.us/my.php?image=physics3ue4.png

    A 1229.0 N uniform broom of length L is supported by a cable. The broom is pivoted at the bottom, the cable is attached a distance (3/4)L from the pivot, and a 2442.0 N weight hangs from the brooms top.

    I need to find the Reaction forces (vertical and horizontal), as well as the tension.

    2. Relevant equations
    The basic statics equations, Sum of Moment and Force = 0

    Moment = Torque= r x F
    3. The attempt at a solution

    This is more a problem of setting up this equation. I'm perfectly fine at solving Statics equations, but it's setting them up that I have dificulties with. Here's my questions:

    1) Ok, I'm looking at 4 variables, and three equations. I don't know L, don't know the reaction forces, and the Tension. In statics, this would technically be "statically indeterminte" because we only have two force equations and one moment equation. The problem here is that since L is unknown, and I have to input a number.

    2) How does the broom's angle play into all of this. I know it plays a factor, but for the life of me, I can't figure out where to apply that angle too. >.>

    Thanks in advance.
  2. jcsd
  3. Nov 8, 2008 #2


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    Science Advisor
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    Gold Member

    You may not neeed to know the exact value of L. Sum torques about the base of the boom to solve for T. You'll need to know the angles before you can correctly determine the torques.
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