Question

4**.** A ladder 5 m long has a mass of 18 kg and
its center of gravity is 2.5 m from the bottom. The ladder is
placed against a vertical wall so that it makes an angle of 60°
with the ground. How far up the ladder can a 70 kg man climb before
the ladder is on the verge of slipping? The angle of friction at
all contact surfaces is 16°.

Answer #1

A 16.0-m uniform ladder weighing 490 N rests against a
frictionless wall. The ladder makes a 61.0° angle with the
horizontal.
(a) Find the horizontal and vertical forces 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
__N
direction
- towards the wall or away from the wall?
Vertical Force
magnitude
N
direction
up or down?
(b) If the ladder is just on...

A 16.0-m uniform ladder weighing 490 N rests against a
frictionless wall. The ladder makes a 57.0° 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 4.20 m
along the ladder from the bottom.
Horizontal Force
magnitude
direction
Vertical Force
magnitude
direction
(b) If the ladder is just on the verge of slipping when the
firefighter is 9.10 m from the bottom, what...

A 5.5 m long ladder with a mass of 10.0 kg is leaning against a
wall at a dangerously large angle of 35° (between the ladder and
the wall). The coefficient of static friction between the base of
the ladder and the floor is 0.50 and the top of the ladder has
wheels so there is negligible friction between the ladder and the
wall. How far up along the ladder can a 65.0 kg painter climb
before the ladder slips?...

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 820-N firefighter has climbed 4.20 m
along the ladder from the bottom.
Horizontal Force
magnitude
N
direction
---Select--- towards the wall away from the wall
Vertical Force
magnitude
N
direction
---Select--- up down
(b) If the ladder is just on the...

A uniform ladder has a mass of 16.0 kg and a length of 8.50 m.It
stands on the ground and leans against a vertical wall, making an
angle of 62 degrees with the ground. The friction between the wall
and the ladder is not significant.What is the smallest force of
friction between the ladder and the ground that will prevent the
ladder from slipping?

An 8.00 m, 201 N uniform ladder rests against a smooth wall. The
coefficient of static friction between the ladder and the ground is
0.600, and the ladder makes a 50.0o angle with the
ground. How far up the ladder can an 801N person climb before the
ladder begins to slip?

A ladder of length 15.0 m and of mass 45.0kg is leaning against
a frictionless building wall. An85.0-kg person standing on the
ladder, 1.00 m from its top end, asks his friend to stand on one of
the lower rungs to prevent the ladder from slipping. If the
friend’s mass is 65.0 kg, where should he stand to keep the entire
system in equilibrium? The coefficient of friction between the
ladder and the ground is 0.300, and the angle that...

A uniform ladder of length L and mass m leans against a
frictionless vertical wall, making an angle of 49° with the
horizontal. The coefficient of static friction between the ladder
and the ground is 0.48. If your mass is four times that of the
ladder, how high can you climb before the ladder begins to
slip?

On a Romanian infomercial the 75.0 kg presenter attempts to
climb a 2.25 m long ladder with a mass of 5.00 kg at an angle of
70.0°. The ladder is held up by two other presenters that act as a
frictionless wall. The man on the ladder reaches a height of 1.80 m
when the ladder slips.
a) Solve for the normal forces on the ladder.
b) Solve for the coefficient of friction between the ladder and
the floor.

A 2.0-m-long, 11-kg ladder is resting against a house wall,
making a 35 ∘ angle with the vertical wall. The coefficient of
static friction between the top of the ladder and the wall the
coefficient is 0.00:
A. Determine the minimum coefficient of static friction between
the ladder feet and the ground needed for the ladder to stay in
rest.
B. Determine the magnitude of the normal force of the wall on
the ladder.
C. Determine the magnitude of the...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 4 minutes ago

asked 14 minutes ago

asked 19 minutes ago

asked 26 minutes ago

asked 55 minutes ago

asked 56 minutes ago

asked 59 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago