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 force
Magnitude 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?
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...