Book cover for College Physics: A Strategic Approach Volume 1

College Physics: A Strategic Approach Volume 1

Randall D. Knight, Brian Jones, Stuart Field

ISBN #9780321595492

2nd Edition

1,173 Questions

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23,429 Students Helped

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Summary

Learning Objectives

Key Concepts

Example Problems

Explanations

Common Mistakes

Summary

Chapter 10 delves into the basic energy model, explaining how energy exists in various forms and can be transformed within systems or transferred via work. It emphasizes the importance of the conservation of energy principle, the mathematical formulation of work and kinetic energy, and how to apply these concepts to solve practical problems. Whether analyzing collisions, calculating speeds on ramps, or understanding thermal energy generation through friction, the chapter provides both qualitative understanding and quantitative techniques essential for physics problem-solving.

Learning Objectives

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Key Concepts

CONCEPT

DEFINITION

Definition: The practical application of Newton’s three laws to analyze and solve problems involving static equilibrium and dynamic motion.

The practical application of Newton’s three laws to analyze and solve problems involving static equilibrium and dynamic motion. •

Example Problems

Example 1

During an etiquette class, you walk slowly and steadily at $0.20 \mathrm{~m} / \mathrm{s}$ for $2.5 \mathrm{~m}$ with a $0.75 \mathrm{~kg}$ book balanced on top of your head. How much work does your head do on the book?

Example 2

A $2.0 \mathrm{~kg}$ book is lying on a $0.75-\mathrm{m}$ -high table. You pick it up and place it on a bookshelf $2.3 \mathrm{~m}$ above the floor. a. How much work does gravity do on the book? b. How much work does your hand do on the book?

Example 3

The two ropes seen in Figure $\mathrm{P} 10.3$ are used to lower a $255 \mathrm{~kg}$ piano exactly $5 \mathrm{~m}$ from a second-story window to the ground. How much work is done by each of the three forces?

Example 4

The two ropes shown in the bird's-eye view of Figure $\mathrm{P} 10.4$ are used to drag a crate exactly $3 \mathrm{~m}$ across the floor. How much work is done by each of the ropes on the crate?

Example 5

a. At the airport, you ride a "moving sidewalk" that carries you horizontally for $25 \mathrm{~m}$ at $0.70 \mathrm{~m} / \mathrm{s}$. Assuming that you were moving at $0.70 \mathrm{~m} / \mathrm{s}$ before stepping onto the moving sidewalk and continue at $0.70 \mathrm{~m} / \mathrm{s}$ afterward, how much work does the moving sidewalk do on you? Your mass is $60 \mathrm{~kg}$ b. An escalator carries you from one level to the next in the airport terminal. The upper level is $4.5 \mathrm{~m}$ above the lower level, and the length of the escalator is $7.0 \mathrm{~m}$. How much work does the up escalator do on you when you ride it from the lower level to the upper level? c. How much work does the down escalator do on you when you ride it from the upper level to the lower level?

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Step-by-Step Explanations

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Common Mistakes

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