A 23.0 kg ladder is laid up against a smooth vertical surface. Friction between the floor and the ladder keeps it from slipping. The angle between the floor and the ladder is = 56.0°. B 7. A The length of the ladder is L = 3.50 m and its mass is distributed uniformly. There is no friction along the wall (surface parallel to segment OB) but there is friction along the floor (surface parallel to segment AO). (a) What is the net torque about point A?

A 23.0 kg ladder is laid up against a smooth vertical surface. Friction between the floor and the ladder keeps it from slipping. The angle between the floor and the ladder is = 56.0°. B 7. A The length of the ladder is L = 3.50 m and its mass is distributed uniformly. There is no friction along the wall (surface parallel to segment OB) but there is friction along the floor (surface parallel to segment AO). (a) What is the net torque about point A?

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter8: Rotational Motion

Section: Chapter Questions

Problem 69A

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Concept explainers

Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.

Question

(b) What is the magnitude of torque due to gravity about A?
Tg, A
N•m
(c) Calculate the magnitude of the normal force at point B.
NB
N
(d) Suppose the ladder is at a critical angle: if given a slight nudge, it will slip and fall. What must be the
coefficient of static friction between the ladder and the floor?
με
(e) At the instant the ladder slips, what is its moment of inertia?
Iladder
kg m²

A 23.0 kg ladder is laid up against a smooth vertical surface. Friction between the floor and the ladder keeps it
from slipping. The angle between the floor and the ladder is 0 = 56.0°.
B
-L-
A
The length of the ladder is L 3.50 m and its mass is distributed uniformly. There is no friction along the wall
(surface parallel to segment OB) but there is friction along the floor (surface parallel to segment AO).
(a) What is the net torque about point A?
N•m
ΤΑ

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