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Static equilibrium

  1. Sep 25, 2008 #1
    A window cleaner of mass 95 Kg places a 22 KG ladder against a frictionless wall, at an angle 65 degrees with the horizontal. The ladder is 10 m long and rests on a wet floor with a coefficient of static friction equal to 0.40 What is the maximum length that the window cleaner can climb before the ladder slips.

    I know I need to use Torque, in both X and Y directions, but how do I find the length that the painter can climb.

  2. jcsd
  3. Sep 26, 2008 #2


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    Hi brookbj! :smile:

    (torque doesn't come in x and y directions … it's just a number … or, in 3D, it's a vector in the z direction :wink:)

    Hint: take moments (torques) about the top of the ladder. :smile:
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