ENGG1010 Foundations of Engineering Mechanics
Examination:
Dec 14, 2010, 9:30am12:30pm, Flora Ho Sports Centre
Exam paper is divided into Sections A and B, each containing 3 questions.
You are required to
attempt
5 out of the 6 questions
.
Section B – two questions on fluid mechanics
(Take
g
= 9.81 m/s
2
, density of water = 1,000 kg/m
3
)
Pressure
•
Absolute and gauge pressure.
•
Hydrostatic pressure variation with depth:
(
)
below
above
or
is vertical depth below free surf
ace
p
gz
p
p
g
z
z
ρ
ρ
=
Δ
−
=
•
Manometer and differential manometer:
(
)
/
1
m
m
p
gh
ρ
ρ
ρ
Δ
=
−
Hydrostatics
•
Hydrostatic pressure distribution on the surface of a submerged body.
•
Formulas to calculate the magnitude and depth of centre of pressure for the resultant force
acting on a submerged plane surface:
(
)
2
3
sin
,
,
for rectangular surfa
2
ce
1
g
R
c
R
c
g
c
I
bd
F
gh A
h
h
I
h A
θ
ρ
=
=
+
=
The center of a trapezoidal distribution is at a distance from one end of the distribution given by
h
2
3(
)
a
b
h
a
b
+
+
b
a
•
Second moment of area (formulas except for a rectangular area need not be remembered).
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 Spring '11
 wong
 Fluid Dynamics, resultant force, momentum equation, hydrostatic pressure distribution, Hydrostatic pressure variation, resultant hydrostatic force

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