EBK THINKING LIKE AN ENGINEER
4th Edition
ISBN: 8220103633512
Author: OHLAND
Publisher: PEARSON
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Chapter 19.3, Problem 17CC
Assume a matrix MZ has already been defined. Write two nested for loops to determine how many rows of the matrix MZ contain only negative values. The results should be stored in NegRows.
Example: M2=[3 –6 0;–4 –8 –2 ; 8 –9 1]; NegRows=l
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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 19 Solutions
EBK THINKING LIKE AN ENGINEER
Ch. 19.1 - Create a written algorithm to multiply all integer...Ch. 19.1 - Create a graphical algorithm to multiply all...Ch. 19.1 - Prob. 3CCCh. 19.2 - Assume a vector v2 has already been defined and...Ch. 19.2 - Prob. 5CCCh. 19.2 - Write a while loop that requires the user to input...Ch. 19.2 - Write a program that asks the user to enter a...Ch. 19.2 - Prob. 8CCCh. 19.2 - Prob. 9CCCh. 19.2 - Write a section of code that will ask the user to...
Ch. 19.3 - Write a for loop to display every even number from...Ch. 19.3 - Write a for loop to display every multiple of 5...Ch. 19.3 - Write a for loop to display every odd number from...Ch. 19.3 - Assume a vector Vals has already been defined....Ch. 19.3 - Consider the following table of values. Determine...Ch. 19.3 - Write two nested for loops to determine how many...Ch. 19.3 - Assume a matrix MZ has already been defined. Write...Ch. 19.3 - Prob. 18CCCh. 19.3 - Determine the output of the following code:Ch. 19 - Prob. 1ICACh. 19 - Create a written algorithm or flowchart as...Ch. 19 - Create a written algorithm or flowchart as...Ch. 19 - Create a written algorithm or flowchart as...Ch. 19 - Create a written algorithm or flowchart as...Ch. 19 - Create a written algorithm or flowchart as...Ch. 19 - Create a written algorithm or flowchart as...Ch. 19 - For each of the following code segments, determine...Ch. 19 - a. Assume CA1 and CA2 are cell arrays that both...Ch. 19 - Fill in the table with the values of k, b, x, and...Ch. 19 - Assume that a simple menu has been created by the...Ch. 19 - Write a MATLAB program to implement the algorithm...Ch. 19 - Write a program that will ask the user to input a...Ch. 19 - Write a MATLAB program to implement the algorithm...Ch. 19 - Write a function named CountDown that accepts a...Ch. 19 - While experimenting with coding sequences, you...Ch. 19 - Answer the question with each of the following...Ch. 19 - For each of the following code segments, determine...Ch. 19 - a.Explain what the following function does,...Ch. 19 - For each of the following code segments, determine...Ch. 19 - Prob. 23ICACh. 19 - Prob. 24ICACh. 19 - Write a MATLAB program to implement the algorithm...Ch. 19 - Prob. 26ICACh. 19 - Write a function named GetArray that will accept...Ch. 19 - Assume the vector AM contains an even number of...Ch. 19 - Write a function named EvenSum that will accept a...Ch. 19 - Prob. 30ICACh. 19 - Write a function named CLASS that will accept a...Ch. 19 - You are assessing the price of various components...Ch. 19 - You are studying the number of defective parts...Ch. 19 - The pascal triangle an amazing number of uses,...Ch. 19 - Write a function named Prodstate that will accept...Ch. 19 - Design a flowchart for a program to help students...Ch. 19 - Create an algorithm to allow the user to enter a...Ch. 19 - Write a program to implement the algorithm...Ch. 19 - A zombie picks up a calculator and starts adding...Ch. 19 - Write a function called Balloon that will accept a...Ch. 19 - Prob. 7RQCh. 19 - Prob. 8RQCh. 19 - You are to program part of the interface for a...Ch. 19 - Prob. 13RQCh. 19 - A matrix names mach contains three columns of data...Ch. 19 - Prob. 15RQCh. 19 - You are programming the control system for a robot...Ch. 19 - Write a program to implement the GPA calculator...Ch. 19 - The Fibonacci sequence is an integer sequence...Ch. 19 - As early as 650 BC, mathematicians have been...Ch. 19 - Write a program to analyze the cooling of a cup of...Ch. 19 - After numerous experiments with a circuit...
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