University Physics with Modern Physics

Wolfgang Bauer, Gary D. Westfall

ISBN #9780072857368

1st Edition

3,117 Questions

54,786 Students Helped

Homework Questions

Summary

Learning Objectives

Key Concepts

Example Problems

Explanations

Common Mistakes

Summary

This section explains that heat is not a substance but the transfer of energy due to temperature differences. The First Law of Thermodynamics, ?E_int = Q – W, forms the basis of energy conservation in thermodynamics, and the path-dependent nature of work and heat is illustrated through pV-diagrams. Additionally, the section covers the concepts of specific heat and latent heat, essential for solving calorimetry and phase change problems, and emphasizes the three fundamental modes of heat transfer: conduction, convection, and radiation.

Learning Objectives

Key Concepts

CONCEPT

DEFINITION

Definition: The study of the structure and behavior of atoms, from the early Bohr model to the complete quantum mechanical treatment of the hydrogen atom and multi?electron systems.

The study of the structure and behavior of atoms, from the early Bohr model to the complete quantum mechanical treatment of the hydrogen atom and multi?electron systems. •

Example Problems

Example 1

A 2.0 -kg metal object with a temperature of $90^{\circ} \mathrm{C}$ is submerged in $1.0 \mathrm{~kg}$ of water at $20^{\circ} \mathrm{C}$. The water-metal system reaches equilibrium at $32^{\circ} \mathrm{C}$. What is the specific heat of the metal? a) $0.840 \mathrm{~kJ} / \mathrm{kg} \mathrm{K}$ b) $0.129 \mathrm{~kJ} / \mathrm{kg} \mathrm{K}$ c) $0.512 \mathrm{~kJ} / \mathrm{kg} \mathrm{K}$ b) $0.129 \mathrm{~kJ} / \mathrm{kg} \mathrm{K}$ d) $0.433 \mathrm{~kJ} / \mathrm{kg} \mathrm{K}$

Example 2

A gas enclosed in a cylinder by means of a piston that can move without friction is warmed, and 1000 J of heat enters the gas. Assuming that the volume of the gas is constant, the change in the internal energy of the gas is a) 0 . b) 1000 J. c) -1000 J. d) none of the above.

Example 3

In the isothermal compression of a gas, the volume occupied by the gas is decreasing, but the temperature of the gas remains constant. In order for this to happen, a) heat must enter the gas. b) heat must exit the gas. take place between the gas and the surroundings. c) no heat exchange should

Example 4

Which surface should you set a pot on to keep it hotter for a longer time? a) a smooth glass surface b) a smooth steel surface c) a smooth wood surface d) a rough wood surface

Example 5

Assuming the severity of a burn increases as the amount of energy put into the skin increases, which of the following would cause the most severe burn (assume equal masses)? a) water at $90^{\circ} \mathrm{C}$ b) copper at $110^{\circ} \mathrm{C}$ c) steam at $180^{\circ} \mathrm{C}$ d) aluminum at $100^{\circ} \mathrm{C}$ e) lead at $100^{\circ} \mathrm{C}$