20. A uniform ladder 18.7 ft long is leaning against a frictionless wall at an angle of 45.5° above the horizontal. The weight of the ladder is 32.0 pounds. A 68.0 Ib boy climbs 5.59 ft up the ladder. Calculate the coefficient of static friction that acts between the ladder and the ground to keep the ladder stable. (Pro-Tip: do not waste time converting to SI units as they will cancel appropriately; use the force and distance values given.) a. 0.364 b. 0.370 c. 0.163 d. 0.0425 e. 0.357

20. A uniform ladder 18.7 ft long is leaning against a frictionless wall at an angle of 45.5° above the horizontal. The weight of the ladder is 32.0 pounds. A 68.0 Ib boy climbs 5.59 ft up the ladder. Calculate the coefficient of static friction that acts between the ladder and the ground to keep the ladder stable. (Pro-Tip: do not waste time converting to SI units as they will cancel appropriately; use the force and distance values given.) a. 0.364 b. 0.370 c. 0.163 d. 0.0425 e. 0.357

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Rotational Equilibrium And Rotational Dynamics

In physics, the state of balance between the forces and the dynamics of motion is called the equilibrium state. The balance between various forces acting on a system in a rotational motion is called rotational equilibrium or rotational dynamics.

Equilibrium of Forces

The tension created on one body during push or pull is known as force.

Question

**Problem 20: Static Friction of a Ladder**

A uniform ladder, 18.7 feet long, is leaning against a frictionless wall at an angle of 45.5° above the horizontal. The weight of the ladder is 32.0 pounds. A boy weighing 68.0 pounds climbs 5.59 feet up the ladder. Calculate the coefficient of static friction that acts between the ladder and the ground to keep the ladder stable.

**Note:**

- Do not waste time converting to SI units as they will cancel appropriately; use the force and distance values given.

**Options:**

a. 0.364
b. 0.370
c. 0.163
d. 0.0425
e. 0.357

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