A Window Washer Attempts to Lean a Ladder Against a Frictionless

question 23

Multiple Choice

A window washer attempts to lean a ladder against a frictionless wall. He finds that the ladder slips on the ground when it is placed at an angle of less than 75 $\degree$ to the ground but remains in place when the angle is greater than 75 $\degree$ . The coefficient of static friction between the ladder and the ground:

• A) is about 0.13
• B) is about 0.27
• C) is about 1.3
• D) depends on the mass of the ladder
• E) depends on the length of the ladder

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