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Homework Help: Rigid body equilibrium

  1. Oct 23, 2007 #1
    1. The problem statement, all variables and given/known data

    http://img66.imageshack.us/img66/9317/inlinelt8.th.jpg [Broken]

    3. The attempt at a solution
    Sorry, By and B should be in lbs, not lbft
    http://img141.imageshack.us/img141/9320/pictarsp4.th.jpg [Broken]

    My work just shows how I attempted to find the force B. According to my book, the force B should be 2140 lb.

    I'm really not sure if I handled the incline (force B) correctly. I know it's supposed to be perpendicular to the point of contact.

    Does anyone see where I went wrong? As far as I can tell, the width of the beam (1.2ft) isn't important for finding any of the vector components.
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Oct 23, 2007 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Looks like you neglected the torque due to the horizontal component of force B. (That's where the beam width will come in.)
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