A 14.0 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 (in N) the ground exerts on the base of the ladder when an 820 - N firefighter has climbed 4.30 m along the ladder from the bottom. horizontal force magnitude Ndirection ---Select-- - towards the wall away from the wall vertical force magnitude Ndirection ---Select-- - up down (b) If the ladder is just on the verge of slipping when the firefighter is 9.30 m from the bottom, what is the coefficient of static 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 the value found in part (b), what is the maximum distance ( in m) the firefighter can climb along the ladder from the bottom before the ladder slips? m

Glencoe Physics: Principles and Problems, Student Edition
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Chapter5: Displacement And Force In Two Dimensions
Section: Chapter Questions
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A 14.0 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 (in N) the
ground exerts on the base of the ladder when an
820 - N firefighter has climbed 4.30 m along the
ladder from the bottom.
horizontal force
magnitude Ndirection ---Select-- - towards the
wall away from the wall
vertical force
magnitude Ndirection ---Select-- - up down
(b)
If the ladder is just on the verge of slipping when
the firefighter is 9.30 m from the bottom, what is
the coefficient of static 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 the value
found in part (b), what is the maximum distance (
in m) the firefighter can climb along the ladder
from the bottom before the ladder slips?
m
Transcribed Image Text:A 14.0 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 (in N) the ground exerts on the base of the ladder when an 820 - N firefighter has climbed 4.30 m along the ladder from the bottom. horizontal force magnitude Ndirection ---Select-- - towards the wall away from the wall vertical force magnitude Ndirection ---Select-- - up down (b) If the ladder is just on the verge of slipping when the firefighter is 9.30 m from the bottom, what is the coefficient of static 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 the value found in part (b), what is the maximum distance ( in m) the firefighter can climb along the ladder from the bottom before the ladder slips? m
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