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S12‐CIVE280 Final Exam Formulas, Conversions & Properties ‐‐ version 1 1/3
Formulas
m
1
S
W
g
. .w
S G S
0 0v
dp dpE
d d
dv
dy
2 cosh
r
abs gauge atmp p p
dp
dz p z
dp
dh p h
F pA hA
xcCP
Ih h
hA
xycCP
Ix x
hA
F pA hA xc
CP
Iy y
yA
xycCP
Ix x
yA
pressure prism
acting at prism
centroid
F
F dF p dA CPy F y dF
CPx F x dF
projectedγ
acting at CP
F hA
free surfaceγ
acting at CG
F displacedγ
acting at CB
F
0
0
IMB
in out
in out
dQ Q
dtd
Q Qdt
1 2
1 1 2 2
in outQ Q
Q Q
V A V A
2 21 1 2 2
1 22 2Gain Loss
V p V pz h z h
g g
2 1
( ) ( )
( )
out inF QV QV
F Q V V
ReVd Vd
2 4
32 128L
L Lh V Q
d d
2 2
0( )4
Lhv r r r
L
2
2L
L Vh f
d g
2
2L L
Vh K
g Re1
2log Re 0.80 2log2.51
ff
f
Omech Ohyd
m pOelec Omech
eP P
e eP P
OhydP Q h 1
2log( / ) 1.14 2log(3.72 / )d df
oldnew actual
old
ii T
i
QQ Q
Q
2 2
2 5
8L
f LQ
dh KQ
g
1 / 2.512log
3.72 Re
d
f f
onew ldQ Q Q 1
1
2
n
i i ii
n
i ii
K Q QQ
K Q
2
0.9
/ 5.740.25 log
3.7 Re
df
S12‐CIVE280 Final Exam Formulas, Conversions & Properties ‐‐ version 1 2/3
Conversions
1 lb = 4.448 N 1 lbm = 0.4536 kg 1 slug = 14.59 kg
1 ft = 0.3048 m 1 ft = 12 in 1 psi = 1 lb/in2 = 144 lb/ft2 =6895 Pa
1 horsepower = 745.7 W = 550 lb ft/s
Physical Properties of Water @ 20°C (68 °F)
σ (in air) Ev Vapour Pressure
998 kg/m3 9790 N/m3 1.00 10‐3 Pa∙s 7.13 10‐2 N/m 2.2 GPa 821 Pa
1.94 slug/ft3 62.3 lb/ft3 2.09 10‐5 lb∙s/ft2 4.89 10‐3 lb/ft 3.2105 lb/in2 0.119 lb/in2
Gravitational Constant and Standard Atmosphere
g Standard Atmosphere
9.81 m/s2 101.4 kPa 760 mm Hg 10.3 m H2O
32.2 ft/s2 14.7 lb/in2 29.9 in Hg 33.8 ft H2O
S12‐CIVE280 Final Exam Formulas, Conversions & Properties ‐‐ version 1 3/3