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Basic non-rotating accelerating reference frame problem

  1. Nov 19, 2013 #1
    1. The problem statement, all variables and given/known data

    A uniform thin rod of length ##L## and mass ##M## is pivoted at one end. The pivot is attached to the top of a car accelerating at rate ##A##. What is the equilibrium value of the angle ##\theta## between the rod and the top of the car?

    2. Relevant equations

    None in particular?

    3. The attempt at a solution

    I understand that we can treat the acceleration of the car as a horizontal gravitational field of strength ##A##. I attempted to solve the problem via torque balance (taking the torque about the pivot), but the only two forces, gravity and the fictional force, have ##\theta## terms that end up cancelling out. I'm sure this is simple, but honestly moving on is going to problem if I can't even do this problem, haha.
     
  2. jcsd
  3. Nov 19, 2013 #2
    Oh, never mind, totally figured this one out.
     
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