A16.0-m uniform ladder weighing 480 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 850-n firefighter has climbed 3.80 m along the ladder from the bottom.
(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?

horizontal force component 535.00 N

vertical force component 1330 N

Explanation:

from equilibrium condition at A

FROM equilibrium condition

N_1 = mg +850

       = 480 + 850

       = 1330 N

horizontal force component

f_2 = N_2

      = 535.00 N

vertical force component

N_1 = 1330 N

B) Coefficient of friction between ladder and ground when fire fighter is 9.4 m away from ground

N_2 =517.71 N

Thus coefficient of friction is

      =                     [f_2 = N_2]

       = 0.38

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)