Thinking Like An Engineer: An Active Learning Approach, Student Value Edition (4th Edition)
4th Edition
ISBN: 9780134640150
Author: STEPHAN, Elizabeth A.; Bowman, David R.; Park, William J.; Sill, Benjamin L.; Ohland, Matthew W.
Publisher: PEARSON
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Textbook Question
Chapter 15.7, Problem 23CC
Use the data stored in MetalData to answer the following questions:
- a. Write a single line of code that will determine the mass in kilograms of one cubic meter of zinc and place the result in MZn.
- b. Assume the number of one of the structures in MetalData is stored in a variable MSn. Write a single line of code that will place the mass number of the lightest isotope of the corresponding metal in the variable LzIsd.
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You are working as an engineer in a bearing systems design company. The flow of
lubricant inside a hydrodynamic bearing (p = 0.001 kg m-1 s-1) can be approximated
as a parallel, steady, two-dimensional, incompressible flow between two parallel plates.
The top plate, representing the moving part of the bearing, travels at a constant speed,
U, while the bottom plate remains stationary (Figure Q1). The plates are separated by
a distance of 2h = 1 cm and are W = 20 cm wide. Their length is L = 10 cm. By
applying the above approximations to the Navier-Stokes equations and assuming that
end effects can be neglected, the horizontal velocity profile can be shown to be
y = +h
I
2h = 1 cm
x1
y = -h
u(y)
1 dP
2μ dx
-y² + Ay + B
moving plate
stationary plate
U
2
I2
L = 10 cm
Figure Q1: Flow in a hydrodynamic bearing. The plates extend a width, W = 20 cm,
into the page.
Question 1
You are working as an engineer in a bearing systems design company. The flow of
lubricant inside a hydrodynamic bearing (µ = 0.001 kg m¯¹ s¯¹) can be approximated
as a parallel, steady, two-dimensional, incompressible flow between two parallel plates.
The top plate, representing the moving part of the bearing, travels at a constant speed,
U, while the bottom plate remains stationary (Figure Q1). The plates are separated by
a distance of 2h = 1 cm and are W = 20 cm wide. Their length is L = 10 cm. By
applying the above approximations to the Navier-Stokes equations and assuming that
end effects can be neglected, the horizontal velocity profile can be shown to be
1 dP
u(y)
=
2μ dx
-y² + Ay + B
y= +h
Ꮖ
2h=1 cm
1
x1
y = −h
moving plate
stationary plate
2
X2
L = 10 cm
Figure Q1: Flow in a hydrodynamic bearing. The plates extend a width, W = 20 cm,
into the page.
(a) By considering the appropriate boundary conditions, show that the constants take
the following forms:
U
U
1 dP
A =…
Question 2
You are an engineer working in the propulsion team for a supersonic civil transport
aircraft driven by a turbojet engine, where you have oversight of the design for the
engine intake and the exhaust nozzle, indicated in Figure Q2a. The turbojet engine can
operate when provided with air flow in the Mach number range, 0.60 to 0.80. You are
asked to analyse a condition where the aircraft is flying at 472 m/s at an altitude of
14,000 m. For all parts of the question, you can assume that the flow path of air through
the engine has a circular cross section.
(a)
← intake
normal
shock
472 m/s
A B
(b)
50 m/s
H
472 m/s
B
engine
altitude: 14,000 m
exhaust nozzle
E
F
exit to
atmosphere
diameter: DE = 0.30 m
E
F
diameter: DF = 0.66 m
Figure Q2: Propulsion system for a supersonic aircraft.
a) When the aircraft is at an altitude of 14,000 m, use the International Standard
Atmosphere in the Module Data Book to state the local air pressure and tempera-
ture. Thus show that the aircraft speed…
Chapter 15 Solutions
Thinking Like An Engineer: An Active Learning Approach, Student Value Edition (4th Edition)
Ch. 15.1 - Which of the following are valid MATLAB variable...Ch. 15.1 - Which of the following assignment statements are...Ch. 15.1 - a. Store all workspace variables in the file...Ch. 15.2 - Write MATLAB code to complete the following...Ch. 15.2 - a. Calculate the two roots of the quadratic...Ch. 15.3 - Each problem should be done with a single MATLAB...Ch. 15.3 - Assume a row vector named vals has already been...Ch. 15.3 - a. Place the indices of all nonzero elements of...Ch. 15.3 - a. Create a column vector CV1 containing 123...Ch. 15.3 - Comprehension Check 15-1 0 a. Assume you have four...
Ch. 15.3 - a. Write a single MATLAB command that will create...Ch. 15.4 - a. Create the matrix CCM1=[180.34.11017] using a...Ch. 15.4 - Write single MATLAB statements to perform each of...Ch. 15.4 - Write single MATLAB statements to perform each of...Ch. 15.4 - Write single MATLAB statements to perform each of...Ch. 15.4 - Write single MATLAB statements to perform each of...Ch. 15.4 - For each of the following questions, write a...Ch. 15.5 - a. Create a variable named MTS containing the text...Ch. 15.6 - Assume a cell array named CA has three cells in a...Ch. 15.6 - Prob. 21CCCh. 15.7 - Create a structure array named Resistors...Ch. 15.7 - Use the data stored in MetalData to answer the...Ch. 15.7 - The structure array named Hdwr has the following...Ch. 15 - Which of the following are not valid MATLAB...Ch. 15 - Prob. 2ICACh. 15 - For the following questions, assume that the...Ch. 15 - For each calculation described below, write a...Ch. 15 - For each calculation described below, write a...Ch. 15 - For each of the vectors described below, write a...Ch. 15 - Assume the following vectors are already defined:...Ch. 15 - For each of the following sequences, write a...Ch. 15 - Modify the following statements so that they are...Ch. 15 - Assume you have three equal-length row vectors....Ch. 15 - Write the MATLAB code necessary to create the...Ch. 15 - For each of the following problems, write a single...Ch. 15 - Assume you have two equal-length row vectors IV1...Ch. 15 - Write the MATLAB code necessary to create the...Ch. 15 - Assuming t = [9 10; 11 12] and v = [2 4;6 8;10 12]...Ch. 15 - Determine solutions to the following problems a....Ch. 15 - For each of the following problems except part...Ch. 15 - Assume you have an N M matrix named Gonzo For...Ch. 15 - For each of the following tasks. write a single...Ch. 15 - Determine the contents of the variables created or...Ch. 15 - For each of the following tasks, write a single...Ch. 15 - For each of the following problems, write a single...Ch. 15 - Each of the following questions contains a...Ch. 15 - Prob. 25ICACh. 15 - Assume a cell array CA1 has already been defined....Ch. 15 - Prob. 27ICACh. 15 - You are setting up a structure array named client...Ch. 15 - You have three temperature values [C] stored in...Ch. 15 - You have N temperature values [C] stored in the...Ch. 15 - Assume four row vectors named Prod10, Prod11,...Ch. 15 - You have a 2 N matrix named GasData. The first...Ch. 15 - Assume the matrix M99 has at least two rows and at...Ch. 15 - Assume a matrix named Prod contains data on...Ch. 15 - You are studying the effects of climate change on...Ch. 15 - You are studying the properties of tiny spheres...Ch. 15 - Assume you have a four-column matrix named...Ch. 15 - One very old method of sending secret messages is...Ch. 15 - Prob. 13RQCh. 15 - Prob. 15RQCh. 15 - Refer to the specifications for Review Questions...
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