Book cover for College Physics

College Physics

Eugenia Etkina, Michael Gentle, Alan Van Heuvelen

ISBN #9780321715357

1st Edition

2,258 Questions

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Homework Questions

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Summary

Learning Objectives

Key Concepts

Example Problems

Explanations

Common Mistakes

Summary

This section delves into the behavior of static fluids by establishing how pressure, density, and buoyant force interact. Key principles include the relationships encapsulated in Pascal’s First and Second Laws, along with Archimedes’ Principle for buoyancy. By understanding these concepts, one can analyze scenarios as diverse as hydraulic lifts, atmospheric pressure measurements, buoyancy in water and air, and the design of floating structures. Grasping these principles is essential not only for solving textbook problems but also for applications in engineering, meteorology, and everyday life.

Learning Objectives

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Key Concepts

CONCEPT

DEFINITION

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Example Problems

Example 1

Water in human body About two-thirds of your body mass consists of water. Determine the volume of water in a 70-kg person.

Example 2

Determine the average density of Earth. What data did you use? What assumptions did you make?

Example 3

Use data for the normal pressure and the density of air near Earth’s surface to estimate the height of the atmosphere, assuming it has uniform density. Indicate any additional assumptions you made. Are you on the low or high side of the real number?

Example 4

A single-level home has a floor area of 200 $m^{2}$ with ceilings that are 2.6 $m$ high. Estimate the mass of the air in the house.

Example 5

A diet decreases a person’s mass by 5%. Exercise creates muscle and reduces fat, thus increasing the person’s density by 2%. Determine the percent change in the person’s volume.

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Step-by-Step Explanations

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Common Mistakes

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