Economics 20
Prof. Patricia M. Anderson
MIDTERM EXAM EXPLANATIONS
1. This was a very straightforward question about the interpretation of dummy variables and reported
p-values. Were told that season is a dummy variable = 1 if the athletes sport is in seas
Lecture 13
ES 331
Mechanics of Materials
1 of 1
Class meeting 12 will be used to take Exam #1.
o This exam covers material from Sections 1.1 2.20 of the text and
the associated class notes, lectures, and homework assignments.
lecture13.docx
ES 331
Mechanics of Materials
Lecture 09
1 of 10
We ended our discussion last class by stating the generalized Hookes
Law Equations:
x =
y =
z =
x
E
y
E
z
E
y
E
x
E
x
xy =
yz =
zx =
E
z
E
z
E
y
E
xy
G
yz
G
zx
G
o Given that we know the stresse
ES 331
Mechanics of Materials
Lecture 13
1 of 7
The course syllabus notes a Project worth 5% of your total grade.
o This project is designed to demonstrate the use of some modern
engineering tools that are available to enhance the engineers
ability to do
ES 331
Mechanics of Materials
Lecture 10
1 of 8
So far, when weve considered the stress-strain relationship for deriving
equations, weve consider only the linear (elastic) portion of the -
Diagram.
o This is a good region to work in if were dealing with
ES 331
Mechanics of Materials
Lecture 07
1 of 15
To this point weve relied on Statics to determine the forces/reactions
within the structures.
o We mentioned several times that there are some problems that
cant be solved if we only have the tools from Sta
ES 331
Mechanics of Materials
Lecture 04
1 of 9
All of the stresses weve considered so far (normal, shear, and bearing)
have been determined in a plane perpendicular/parallel to the applied
forces.
o We have only considered the normal stress caused by an
ES 331
Mechanics of Materials
Lecture 03
1 of 9
Last time we introduced the concept of stress.
o In our example, we calculated the forces in member AB of our plant
hangar.
o The force(s) were directed along the axis of the member. We call
this axial loadi
ES 331
Mechanics of Materials
Lecture 02
1 of 10
In this course, we will extend the knowledge gained in Statics about forces
and moments applied to a structure or structural/machine element.
o We will systematically eliminate the assumption of the rigid b
ME265Introductionto
ThermalSciences
Lecture 7
THE SECOND LAW OF THERMODYNAMICS
1
INTRODUCTIONTOTHESECONDLAW
A cup of hot coffee left in a cooler room eventually cools off.
The first law of thermodynamics since the amount of energy lost by the coffee
is
Lecture 26
ES 346
Basic Thermodynamics
1 of 8
Weve noted that entropy is another property of a substance.
o For reversible processes, it can be related to the heat transfer and
temperature of the process by:
Q
dS =
T int Re v
(1)
o It is helpful to de
ES 346
Basic Thermodynamics
Lecture 29
1 of 7
The Final Exam is Tuesday, 8 May, at 15:15 17:15 in Duc 252.
o The exam will cover material covered since Exam #2. This consists
of the subjects in chapters 6 & 7 of the text, class sessions 22 29,
and HW #08
ES 346
Basic Thermodynamics
Lecture 28
1 of 5
In preparation for the Final Exam, lets continue to look at some example
problems.
Problem:
Steam at 6 MPa and 500 enters a two-stage adiabatic turbine at a rate
C
of 15 kg/s. Ten percent of the steam is extra
ME265Introductionto
ThermalSciences
Lecture 4
PROPERTIES OF PURE SUBSTANCES
PURESUBSTANCE
A substance that has a fixed chemical composition throughout is called
a pure substance. Water, nitrogen, helium, and carbon dioxide, for
example, are all pure subst