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## Homework Statement

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 forceMagnitude 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?

## Homework 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...