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Homework Help: Static equilibrium

  1. May 13, 2009 #1
    1. The problem statement, all variables and given/known data

    A 15.5 m uniform ladder weighing 500 N rests against a frictionless wall. The ladder makes a 56.0° angle with the horizontal.

    (a) Find the horizontal and vertical forces the ground exerts on the base of the ladder when an 810 N firefighter is 4.10 m from the bottom.

    Magnitude of the horizontal force

    Magnitude of the vertical force

    (b) If the ladder is just on the verge of slipping when the firefighter is 9.20 m up, what is the coefficient of static friction between ladder and ground?

    2. Relevant equations

    I have no idea how to do this /:
    All I know is that the sum of the forces in the x and y direction has to equal 0.
    Other than that...

    3. The attempt at a solution
  2. jcsd
  3. May 14, 2009 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Good--that describes translational equilibrium. What's the condition for rotational equilibrium?
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