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boomclapslap

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## Homework Statement

(8 marks)

A uniform ladder (m = 35kg) leans against a smooth frictionless wall. The foot of the ladder is 3 m from the wall and an 85kg firefighter stands 3m up the ladder as shown. Find the coefficient of friction of the floor.

http://i49.tinypic.com/ftdo9g.jpg

## Homework Equations

(Angular Newton's Second Law and Linear Newton's First Law)

Στ=0 and ΣFx=ΣFy=0

τ = F⊥r