A 16.0-m uniform ladder weighing 490 N rests against a frictionless wall. The ladder makes a 55.0° angle with the horizontal.
(a) Find the horizontal and vertical forces the ground exerts on the base of the ladder when an 840-N firefighter has climbed 4.10 m along the ladder from the bottom. Horizontal Force magnitude N direction Vertical Force magnitude N direction
(b) If the ladder is just on the verge of slipping when the firefighter is 9.40 m from the bottom, what is the coefficient of static friction between ladder and ground? It may be helpful to think first about the force the wall exerts on the ladder. How is this related to the force that the ground exerts on the ladder?