EBK THINKING LIKE AN ENGINEER
4th Edition
ISBN: 8220103633512
Author: OHLAND
Publisher: PEARSON
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Chapter 10, Problem 5ICA
ICA 10-5
The worksheet shown here was designed to calculate the total pressure felt by an object submerged in a fluid as a function of the depth to which the object is submerged. The user will enter the surface pressure (in units of atmospheres), specific gravity of the fluid, and the gravity of the planet (in units of meters per second squared). All user input is shown in red. The worksheet will calculate the surface pressure in units of pascals, the density of the fluid in kilograms per cubic meter, and depth in units of feet. All conversions are shown in orange. Finally, the worksheet will calculate the total pressure in units of atmospheres.
- a. What formula should be typed in cell C8 to convert the surface pressure in cell C4 from atmospheres to pascals?
- b. What formula should be typed in cell C9 to determine the density in units of kilograms per cubic meter?
- c. What formula should be typed into cell B12 that can then be copied clown column B to convert the depth from units of feet to units of meters?
- d. What formula should be typed into cell C12 that can then be copied down column C to calculate the total pressure in units of atmospheres?
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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 10 Solutions
EBK THINKING LIKE AN ENGINEER
Ch. 10.1 - Type 5 in cell E22 and 13 in cell E23; type =E22 +...Ch. 10.1 - Type 45 into cell G22 and =G22 + 10 in cell H22....Ch. 10.1 - Type 40 into cell A28 and =A28 + 10 in cell D28....Ch. 10.1 - Type 40 into cell A28 and =A28 + 5 in cell G28....Ch. 10.2 - Launch a new worksheet. Type the following Excel...Ch. 10.2 - As part of the design of a high-performance...Ch. 10.3 - Evaluate the following expressions. What is the...Ch. 10.3 - Prob. 8CCCh. 10.4 - This is a continuation of the worksheet you...Ch. 10.5 - Prob. 11CC
Ch. 10.6 - In 1980, the Environmental Protection Agency (EPA)...Ch. 10 - A B C D E F 1 2 45 3 meters 4...Ch. 10 - A B C D E F 1 2 45 3 meters 4...Ch. 10 - A B C D E F 1 2 45 3 meters 4...Ch. 10 - A B C D E F 1 2 45 3 meters 4...Ch. 10 - ICA 10-5 The worksheet shown here was designed to...Ch. 10 - The worksheet provided was designed to calculate...Ch. 10 - Some alternate energy technologies, such as wind...Ch. 10 - The worksheet shown was designed to calculate the...Ch. 10 - The worksheet shown was designed to calculate the...Ch. 10 - Refer to the following worksheet. The following...Ch. 10 - Write the output value that would appear in a cell...Ch. 10 - Write the output value that would appear in a cell...Ch. 10 - Refer to the following worksheet. In all...Ch. 10 - Prob. 14ICACh. 10 - A bioengineer conducts clinical trials on...Ch. 10 - Refer to the Worksheet shown, set up to calculate...Ch. 10 - You are interested in analyzing different implant...Ch. 10 - You have a large stock of several values of...Ch. 10 - We accidentally drop a tomato from the balcony of...Ch. 10 - You are interested in calculating the best place...Ch. 10 - 1. A history major of your acquaintance is...Ch. 10 - Prob. 2RQCh. 10 - 3. A phase diagram for carbon and platinum is...Ch. 10 - 4. A simplified phase diagram for cobalt and...Ch. 10 - 5. You enjoy drinking coffee but are particular...Ch. 10 - 6. In the 1950s, a team at Los Alamos National...Ch. 10 - Use the following phase diagram for questions 7...Ch. 10 - Use the following phase diagram for questions 7...Ch. 10 - Use the following phase diagram for questions 9...Ch. 10 - Use the following phase diagram for questions 9...Ch. 10 - 11. When liquid and vapor coexist in a container...Ch. 10 - 12. The ideal gas law assumes that molecules...Ch. 10 - One of the NAE Grand Challenges for Engineering is...Ch. 10 - 15 Create an Excel worksheet that will allow the...Ch. 10 - Prob. 16RQ
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