SE110B Assignment 1
Due 04/10/2015
1. A wire is used to hang a lantern over a pool. Neglect the weight of the wire, and
assume that it is taut, but strain free, before the lantern is hung. When the lantern
is hung, it causes a 50-mm sag in the wire. Deter

SE115 Assignment 2
Due 01/22/2010
1. For the inclined-tube manometer of the following figure the pressure in pipe A is
0.8 psi. The fluid in both pipes A and B is water, and the gage fluid in the
manometer has a specific gravity of 2.6. What is the pressu

SE115 Assignment 4
Due 02/04/2011
1. Air flows steadily through the contraction shown in the following figure. Derive
an expression for the fluid velocity at (2) in terms of D1 , D2 , , m , and h.
2. The wind blows through a 7 10 -ft garage door with a sp

SE115 HW 6 Answer
1. Step # 1 List all the variables and find k
= (, , , , ) , k = 6
Step # 2 Express each variable in terms of basic dimensions
= 2 1 = = = 2 = F4 2
So: r = 3 (F, L, T)
= F2
Step # 3 Determine the required number of Pi terms
Pi theore

Problem 1
Velocity: ui w k
Salinity of water changes as T (x, y, z, t) = az cos(bt)
There are no components of velocity in the direction of .
!
Replace T
" cos$
" cos $
" cos$
%
Differentiation about x is equal to 0
" cos $

SE115 Assignment 1
Due 01/16/2015
1. The volume rate of flow, Q, through a pipe containing a slowly moving liquid is
R 4 p
given by the equation Q =
, where R is the pipe radius, p the pressure
8l
drop along the pipe, the dynamic viscosity, and l the leng

SE115 Assignment 2
Due 01/23/2015
1. A mercury manometer is connected to a large reservoir of water as shown in the
following figure. The specific gravity of mercury is 13.6. Determine the ratio
hw / hm .
2. For the inclined-tube manometer in the followin

SE115 Assignment 3
Due 01/30/2015
1. An underwater vehicle moves with velocity ui w k through water. The salinity of
water changes as T ( x , y , z , t ) = az cos(bt ) . Find the rate of change of temperature
measured by the probe.
2. (a) In a rescue oper

SE115 Assignment 4
Due 02/06/2015
1. Air flows steadily through the contraction shown in the following figure. Derive
an expression for the fluid velocity at (2) in terms of D1 , D2 , , m , and h.
2. The wind blows through a 7 10 -ft garage door with a sp

SE115 Assignment 5
Due 02/13/2015
1. Air flows past an object in a 2-m-diameter pipe and exits as a free jet as shown in
the following figure. In the input the velocity is 10 m/s and uniform. In the output
the velocity is nonuniform as indicated. The pres

SE115 Assignment 6
Due 02/20/2015
1. Water flows over a dam as illustrated in the following figure. Assume the flow rate, q,
per unit length along the dam depends on the head, H, width, b, acceleration of
gravity, g, fluid density, , and fluid viscosity,

SE115 Assignment 7
Due 03/06/2015
1. To cool a given room it is necessary to supply 4 ft3/s of air through an 8-in.diameter pipe. Approximately how long is the entrance length in this pipe?
2. A soft drink with the properties of 15 0C water is sucked thro

University of California, San Diego
Department of Structural Engineering
SE 130B Spring 2015
STRUCTURAL ANALYSIS II
Homework 2,
DUE April 13, 2015 6 PM
Problem 1
The structure shown in composed of rigid carts connected by spring with DOFS (us)
indicated.

SE110B Assignment 3
Due 04/25/2014
1. The aluminum-alloy shaft AC (G=20 GPa) has an 800-mm-long solid segment
AB and a 400-mm-long tubular segment BC. The shaft is subjected to the
torsional loading shown in the following figure. The diameters are:
d 1 =

SE115 Assignment 8
Due 03/13/2015
1. A smooth flat plate of length l = 6 m is placed in water ( = 1000 kg/m3,
= 10 6 m2/s) with an upstream velocity of U = 0.5 m/s. Use the Blasius solution
and determine the boundary layer thickness, the displacement thi

L9 The pressure difference. Ap. across a partial blackagc
in an artery (cal-led a stenosio‘) is approximmnd by the equation
2
Ap = Ku—D— + K"(—l'— l)pV2
where v is the blood velocity, o me blood viscosity (FL—2T),
p the blood density (541:3), D the artery

SE115 Assignment 2
Due 01/23/2015
1. A mercury manometer is connected to a large reservoir of water as shown in the
following figure. The specific gravity of mercury is 13.6. Determine the ratio
hw / hm .
Solution:
The pressure at point A is p A = w (hw +

1. With the Couette flow profile, the shear stress on the bottom of the mass is
= x& / h . Therefore the total shear force on the mass is A = x&A / h . According to
Then b = A / h .
2.
h
. In the y-coordinate, the centroid of the gate is
2 sin
h
h
3h
+

SE115 Assignment 5
Due 02/11/2011
1. Determine the magnitude of the horizontal component of the anchoring force per
unit width required to hold in place the sluice gate shown in the following figure.
Assume that the flow downstream is uniform. The pressur

SE115 HW 5 Answer
1. Using the conservation of momentum equation, we have
r
r
r
outVout AoutVout inVin AinVin = F = Fdrag b + Fpin b Fpout b
Vout hout bVout Vin hin bVin = Fdrag b + F pin b F pout b ,
where is the density of water. b is the width. F pout

SE115 Assignment 7
Due 02/25/2011
1. To cool a given room it is necessary to supply 4 ft3/s of air through an 8-in.diameter pipe. Approximately how long is the entrance length in this pipe?
2. A soft drink with the properties of 15 0C water is sucked thro

SE115 Assignment 7 answer
Q
11.46 ft/s. Density = 2.38 10 3 slug/ft3
1
D 2
4
Dynamic viscosity = 3.74 10 7 lb.s/ft2
Reynolds number: Re = VD / = 48,614
Therefore the flow is turbulent
le
1/ 6
= 4.4(Re ) , l e = 17.7 ft
D
1. Average speed in the pipe V =

SE115 Assignment 1
Due 01/14/2011
1. If V is a velocity, l a length, and v a fluid property having dimensions of
L2T 1 , find the dimensions in both FLT and MLT systems the following
combinations: (a) Vlv , (b) Vl / v , (c) V 4 v , (d) V /(l 2 v ) . Which

SE115 Assignment 3
Due 01/29/2016
1. A ship is moving with a constant speed of 3 m/s. Estimate the height of the water
bump in front of its bow.
2. As shown in the following figure, water flows steadily through the pipe. Along
r
the center line, velocity

SE 115 Fluid Mechanics/Structural Eng - Winter 2016
Answers of Assignment 2
1
Moving from A to B inside the pipe, we have
PA + 3.0w 8.0sin(30 ) 2.6w 3.0w = PB
lb
= 0.0361 inlb3 and PA = 0.8 inlb2
Knowing w = 62.42 flbt3 = 62.42
123 in3
PB = 0.8 + 3.0 0.0

SE115 Assignment 2
Due 01/22/2016
1. For the inclined-tube manometer of the following figure the pressure in pipe A is
0.8 psi. The fluid in both pipes A and B is water, and the gage fluid in the
manometer has a specific gravity of 2.6. What is the pressu

SE 115 Fluid Mechanics for Structural Engineers - Winter 2016
Answers of Assignment 3
1
In a ship-fixed reference system, we use the Bernoullis equation at two points along the free surface
(a streamline). One point is in the far field and the other point

SE 115 Fluid Mechanics/Structural Engr - Winter 2016
Answers of Assignment 1
1
a
F V l
FLT
MLT
F LT 1 LL2 T 1 = F L4 T 2
M LT 2 LT 1 LL2 T 1 = M L5 T 4
with dimension
b
LT 1 L
L2 T 1
Vl
c
(
V 2
LT 1
)2
LT 1 L
L2 T 1
= L0 T 0
L2 T 1 = L4 T 3
(
LT 1
)2
= L0

SE115 Assignment 1
Due 01/15/2016
1. If F is force, V is a velocity, l a length, and v a fluid property having dimensions
of L2T 1 , find the dimensions in both FLT and MLT systems the following
combinations: (a) FVlv , (b) Vl / v , (c) V 2 v , (d) FV /(l