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Homework Help: Static Equilibrium

  1. Jan 10, 2006 #1
    I'm not sure how to go about doing this question. Any help would be great.

    A window cleaner of mass 95 kg places a 22-kg ladder against a frictionless
    wall, at an angle 65° 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?

  2. jcsd
  3. Jan 11, 2006 #2


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    Staff Emeritus
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    Gold Member

    Try taking moments about a point.
  4. Jan 11, 2006 #3
    Draw a free body diagram and then find what force is enough for the ladder to slip. Here torqueplays the role. You take a general point on the ladderabove its centre. Find normal reaction, friction, torque, etc. And then equate them with the distance from centreas variable.
  5. Jan 11, 2006 #4
    Sorry here centre of axis is not the centre of ladder, it is the poit at which it touches the surface..
  6. Jan 11, 2006 #5

    Thanks so much for the help!
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