4.6 Molecular weight data for some polymer are tabulated here. Compute (a) the number-average molecular
weight and (b) the weight-average molecular weight. (c) If it is known that this material's degree of polymerization
is 710, which one of the polymers

HW 11
1. Determine the room temperature heat capacities at constant pressure for the following materials: aluminum,
silver, tungsten, and 70Cu-30Zn brass. (b) How do these values compare with one another? How do you explain
this?
Solution
(a) This problem

Point Defects in Metals
5.1 Calculate the fraction of atom sites that are vacant for lead at its melting temperature of 327C (600
K). Assume an energy for vacancy formation of 0.55 eV/atom.
Solution
In order to compute the fraction of atom sites that are

2.7 Give the electron configurations for the following ions: Fe 2+, Al3+, Cu+, Ba2+, Br-, and O2-.
Solution
The electron configurations for the ions are determined using Table 2.2 (and Figure 2.6).
Fe2+: From Table 2.2, the electron configuration for an a

Unit Cells
Metallic Crystal Structures
3.2 If the atomic radius of aluminum is 0.143 nm, calculate the volume of its unit cell in cubic
meters.
Solution
For this problem, we are asked to calculate the volume of a unit cell of aluminum. Aluminum has
an FCC

An Aggie does not lie, cheat, or steal or tolerate those who do
Name:
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Rehearsal
(50 minutes, Open textbook, open class notes; no other materials is allowed )
1. (a) Find the electrical resistance of a 3 m long, 1.5 cm diameter, cyli

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Rehearsal
1. (a) Find the electrical resistance of a 3 m long, 1.5 cm diameter, cylindrical platinum wire in which a current of 20 A
passes in the axial direction

Friday, 03/02/2012
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Quiz 4 Materials-Spring 2012
50 minutes, Open textbook, open class notes; no other material is allowed, use a pen (no pencils please)
1) We hav

Question:
Nitrogen from a gaseous phase is to be diffused into pure iron at 675C. If the surface concentration is
maintained at 0.2 wt% N, what will be the concentration 2 mm from the surface after 25 h? The diffusion
coefficient for nitrogen in iron at 6

QUIZ 5
The net bonding energy EN between two isolated positive and negative ions is a function of
interionic distance r as follows:
EN
AB
(1), where A, B, m and n are constants for the
rm rn
particular ion pair. Equation (1) is also valid for the bonding

MATERIALS SCIENCE AND ENGINEERING
HOMEWORK 1 Solution
SPRING - 2013
Responses to the questions of this HW are mostly very subjective, thus no unique response
exists. Those shown here are just examples of possible answers:
1. In your opinion, why we study

CHAPTER 12
ELECTRICAL PROPERTIES
PROBLEM SOLUTIONS
Ohms Law
Electrical Conductivity
12.1 (a) Compute the electrical conductivity of a cylindrical silicon specimen 5.1 mm (0.2in.) in diameter
and 51 mm (2 in.) in length in which a current of 0.1 A passes i

Chapter 2: Atomic Structure & Interatomic Bonding
These notes have been prepared by Jorge Seminario from the textbook materials
1
Basic idea properties of materials are a
consequence of
Identity of the atoms
Spatial arrangement of the atoms
Interactio

PROBLEM 1. An aluminum wire 4 mm in diameter is to offer a resistance of no more than 2.5 . Using the data
in Table 12.1, compute the maximum wire length.
Solution
This problem asks that we compute, for an aluminum wire 4 mm in diameter, the maximum lengt

QUIZ 3 Solutions
1) Which of the following sets of properties leads to a high degree of thermal shock
resistance?
(A) High fracture strength
High thermal conductivity
High modulus of elasticity
High coefficient of thermal expansion
(B) Low fracture streng

CHAPTER 19
OPTICAL PROPERTIES
Electromagnetic Radiation
19.1 Visible light having a wavelength of 6 10-7 m appears orange. Compute the frequency and
energy of a photon of this light.
Solution
In order to compute the frequency of a photon of orange light,

6.8 A sheet of BCC iron 1 mm thick was exposed to a carburizing gas atmosphere on one side and a decarburizing
atmosphere on the other side at 725C. After having reached steady state, the iron was quickly cooled to room
temperature. The carbon concentrati

CHAPTER 18
MAGNETIC PROPERTIES
PROBLEM SOLUTIONS
Basic Concepts
18.1 A coil of wire 0.20 m long and having 200 turns carries a current of 10 A.
(a) What is the magnitude of the magnetic field strength H?
(b) Compute the flux density B if the coil is in a

Concepts of Stress and Strain
7.1 Using mechanics-of-materials principles (i.e., equations of mechanical equilibrium applied to a freebody diagram), derive Equations 7.4a and 7.4b.
Solution
This problem asks that we derive Equations 7.4a and 7.4b, using m

17.4 For aluminum, the heat capacity at constant volume Cv at 30 K is 0.81 J/mol-K and the Debye
temperature is 375 K. Estimate the specific heat (a) at 50 K and (b) at 425 K.
Solution
(a) For aluminum, Cv at 50 K may be approximated by Equation 17.2, sin

3/26/2012
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EXAM 2 Materials
(70 minutes)
1. Determine the ASTM grain size number for the material in the figure with magnification 10,000.
(
(
)
)
(
)
()
n ~17
Page 1 of 8
3/26/

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EXAM 2 Materials-(70 minutes)
1. Properties of polymers are a consequence of
(indicate the wrong answer) [5 points]
a) Type of atoms
b) Arrangement of atoms
c) Interactions bet

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Name
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EXAM 2 Materials-(70 minutes)
1.
Properties of polymers are a consequence of (indicate
the wrong answer) [5 points]
a) Type of atoms
b) Arrangement of atoms
c) Interactions bet

CHAPTER 12: ELECTRICAL PROPERTIES
12.1 Introduction
How a material respond to the application of an electric field Electrical resistance (by electrons) Electron energy band structure of the material Metals, semiconductors and insulators Dielectric charact

ISSUES TO ADDRESS.
Chapter 9: Phase Diagrams for Metallic Systems
what equilibrium state do we get?
When we combine two elements. In particular, if we specify. then.
-a composition (e.g., wt% Cu - wt% Ni), and -a temperature (T ) How many phases do we ge

Chapter 6: Diffusion c06cof01
(Spring 2009)
Steel gear Case hardened High temperature Carbon diffusion
c06cof01
Chapter 6 -
Chapter 6: Diffusion 6.1 Introduction
ISSUES TO ADDRESS.
How does diffusion occur? Why is it an important part of processing? How

Chapter 5 Imperfections in Solids
Thanks to Jeff DePue, Greg Dykes, Alex Eaton
CHAPTER 5: IMPERFECTIONS IN SOLIDS
ISSUES TO ADDRESS.
What are the solidification mechanisms? What types of defects arise in solids? Can the number and type of defects be vari

CHAPTER 4: POLYMER STRUCTURES
Spherulite, rubber specimen. Chain-folded lamellar crystallites, ~10 nm thick, 30,000
Chapter 4 -
c04cof01
ISSUES TO ADDRESS.
What are the general structural and chemical characteristics of polymer molecules? What are some o

Chapter 3: Structures of Metals & Ceramics
X-ray diffraction photograph X-ray diffraction in metals
This notes have been prepared by Jorge Seminario using the textbook material and the extraordinary effort of CHEN 313 Materials students (Spring2009) Ashle