A 14.0 m uniform ladder weighing 480 N rests against africtionless wall. The ladder makes a 63.0°-angle with thehorizontal.
(a)
Find the horizontal and vertical forces (in N) the ground exertson the base of the ladder when an 850-N firefighter has climbed4.10 m along the ladder from the bottom.
horizontal force
magnitude Ndirection ---Select--- towards the wall away from thewall
vertical force
magnitude Ndirection ---Select--- up down
(b)
If the ladder is just on the verge of slipping when thefirefighter is 9.20 m from the bottom, what is the coefficient ofstatic friction between ladder and ground?
(c)
What If? If oil is spilled on the ground,causing the coefficient of static friction to drop to half thevalue found in part (b), what is the maximum distance (in m) thefirefighter can climb along the ladder from the bottom before theladder slips?
m
