Homework 2 Solutions
CE 319F
Prof. Hodges
A. SIMPLE PROBLEMS
A liquid has a specific gravity of 1.07. Answer the following questions about this liquid
using SI units:
1. (4 pts) What is the density?
2. (4 pts) What is the specific weight?
3. (4 pts) Will
Homework 4 Solutions
Prof. Hodges
44 total homework points
A. SIMPLE PROBLEMS
1. (4 pts) Imagine a tube with a rectangular crosssection with inside dimensions of
0.45 mm x 1.7 mm. Compute what will happen if this tube is inserted in a beaker of
water per
Homework 3 Solutions
Prof. Hodges
58 total homework points
A. SIMPLE PROBLEMS
1. (4 pts) Imagine a tube with a rectangular crosssection with inside dimensions of
0.45 mm x 1.7 mm. Compute what will happen if this tube is inserted in a beaker of
water per
)f heat 9
1dings. _
inform z
hshaft
essible
l p0WEI V
turbiIle
of [113'
.ad 1055
4
269
where V1 and V2 are the upstream and downstream velocities.
The hydraulic grade line (HGL) is the prole of the piezometric head, p/y + z,
along a pipe. The energy grade
Homework 3 Solutions
Prof. Hodges
44 total homework points
A. SIMPLE PROBLEMS
1. (4 pts) Imagine a tube with a rectangular crosssection with inside dimensions of
0.45 mm x 1.7 mm. Compute what will happen inside the tube if this tube is
inserted in a bea
Homework 2 Solutions
CE 319F
Prof. Hodges
80 total homework points
A. SIMPLE PROBLEMS
A liquid has a specific gravity of 1.07. Answer the following questions about this
liquid using SI units:
1. (4 pts) What is the density?
2. (4 pts) What is the specific
Homework hints
3.6
3.7 We did in class but do it again so you know it,
3.27 The circle with the + is a pipe that sticks into / out of the page. Start where you know a pressure
[go to right top, open to the air so, Pgage = 0] and then work stepwise through
2.13 Wka is the champ ia the viscosity 8nd demity d water between IOT and 701y=? What is the chmge in t
h viwjsity and
+ (=*.K+&J y

i
z
 : * 
7 e  r a)= ?
:
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z
b
t
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s
& wfl%?.
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9

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126 FLOWING FLUIDS AND PRESSURE VARIATION .
it w
Problems 4.9 A
at de
4.] In the system in the gure. the valve at C is gradually 4.5 Refer to the ow as indicated by the pathlines in Fig. 4.8. ward I
opened in such a way that a constant rate of
LE PROBLEMS
171
where the subscripts l and 2 refer to the inlet and outlet of the pipe. If, in addition, the
flow is incompressible,
AlVl : szz
Cavitation occurs when the pressure drops to the local vapor pressure of the liquid
mg . and bubbles appear due
Homework 5
CE 319F
Prof Hodges
86 total homework points
A. SIMPLE PROBLEMS
1. Imagine a submerged plate that is 4 x 4 meters square and is submerged such
that the lowest edge is 7 m below the waters surface and the plate is angled at 20
degrees away from
Homework 6
CE 319F
Prof Hodges
70 points total
A. SIMPLE PROBLEMS
NONE!
B. CHALLENGE PROBLEMS
1. (10 points) A person is floating in a boat with an aluminum anchor. The anchor
has a specific gravity of 2.2 and a volume of 0.5 ft3. The surface area of wate
Homework 2 Solutions
CE 319F
Prof. Hodges
42 total homework points
A. SIMPLE PROBLEMS
1. (4 pts) A SCUBA diver is 81 meters below the oceans surface. What is the
absolute pressure exerted on his body?
Pgage = gh
Pabs = Pgage + Patmosphere
Density of ocean
Homework 3 Solutions
CE 319F
Prof. Hodges
80 total homework points
A. SIMPLE PROBLEMS
A liquid has a specific gravity of 1.07. Answer the following questions about this
liquid using SI units:
1. (4 pts) What is the density?
2. (4 pts) What is the specific
Name
CE W319f Test 1
Throughout the Test.
specific weiht of water at 4 C = 9.810 N/m3
density of water at 4 C = 1000 kglm3
25 Points
1. You are asked to nd the surface tension of ethanol. You are given
beaker of water. a beaker of ethanol (ethyl alcohol)
UNITS
The FE exam and this handbook use both the metric system of units and the US. Customary System (USCS). In the USCS
System of units, both force and mass are called pounds. Therefore, one must distinguish the poundforce (lbt) from the
poundmass (lbm
FLUID MECHANICS
DENSITY, SPECIFIC VOLUME, SPECIFIC
WEIGHT, AND SPECIFIC GRAVITY
The denitions of density, specic volume, specic weight,
and specic gravity follow:
9 2 limit Am/AV
Al' _ 0
_ ' ' I 7
Y diet. A W
1' =Alinlit0 gAm/AV 2 pg
also SG = y/yw: p/pw
FLUID PROPERTIES
Chapter 2
CE319F: Elementary Mechanics of Fluids
1
Fluid Properties
Define characteristics of a specific fluid
Properties expressed by basic dimensions
length, mass (or force), time, temperature
Dimensions quantified by basic units
We
Tentative Course Outline
CE 319f Elementary Mechanics of Fluids
The University of Texas at Austin
Unique Numbers, Lecture and Lab Times, and Locations
Spring 2016
Note ECJ BASEMENT  B.112A, accessible through B.112
Textbook: Engineering Fluid Mechanics,
Dimensional Analysis
Chapter 8
CE319F: Elementary Mechanics of Fluids
1
Dimensional Analysis
Motivation (an example)
Want to study pressure drop as function of
velocity (V1) and diameter (do)
Carry out numerous experiments with
different values of V1 and
Surface Resistance
Chapters 9
CE319F: Elementary Mechanics of Fluids
1
Types of Drag
Skinfriction drag
due to shear stress (shear forces)
Form drag
due to pressure differences
2
Figure 9.1. Control volume for analysis of uniform flow with parallel st
Energy Principle
Chapter 7
CE319F: Elementary Mechanics of Fluids
1
1st Law of Thermodynamics
First Law of Thermodynamics
E = energy of a system (extensive property)
Q = Heat added to the system
W = Work done by the system
Eu = Internal energy of the
Homework 6
CE 319F
Prof Hodges
80 points total
A. SIMPLE PROBLEMS
none!
CHALLENGE PROBLEMS
1. (10 pts) A large bubble (5 m3) of pure methane gas is released from a broken
riser pipe on an offshore oil rig. If the break in the riser pipe is 500 m beneath t
Homework 7
CE 319F
Prof Hodges
62 total homework points
A. SIMPLE PROBLEMS
1. (4 pts) Consider a rectangular crosssection air duct that enters a room at an
angle as shown below. The average velocity in the duct is 3.0 m/s. The width of the
duct (into the
Homework 4
CE 319F Spring 2013
Prof Hodges
A. SIMPLE PROBLEMS
1. (4 pts) A hollow circular glass tube with an interior diameter of 1mm is inserted
into a pool of mercury that has air above it. The contact angle for mercury/glass/air
is 140 degrees (or 40