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S12CIVE280 Final Exam Formulas, Conversions & Properties ‐‐ version 1 1/3 Formulas m 1 S W g . . w SG S 0 0 v dp dp E d d dv dy 2 cos h r abs gauge atm p p p dp dz p z dp dh p h F pA hA xc CP I h h hA xyc CP I x x hA F pA hA xc CP I y y yA xyc CP I x x yA pressure prism acting at prism centroid F F dF p dA CP y F y dF CP x F x dF projected γ acting at CP F hA free surface γ acting at CG F displaced γ acting at CB F 0 0 I MB in out in out d Q Q dt d Q Q dt 1 2 1 1 2 2 in out Q Q Q Q VA VA 2 2 1 1 2 2 1 2 2 2 Gain Loss V p V p z h z h g g 2 1 ( ) ( ) ( ) out in F QV QV F QV V Re Vd Vd 2 4 32 128 L L L h V Q d d 2 2 0 () 4 L h vr r r L 2 2 L LV h f d g 2 2 L L V h K g Re 1 2log Re 0.80 2 log 2.51 f f f O mech O hyd m p Oelec O mech e P P e e P P O hyd P Qh 1 2 log( / ) 1.14 2 log(3.72 / ) d d f old new actual old i i T i Q Q Q Q 2 2 2 5 8 L fL Q d h KQ g 1 / 2.51 2 log 3.72 Re d f f o new ld Q Q Q 1 1 2 n i i i i n i i i KQ Q Q KQ 2 0.9 / 5.74 0.25 log 3.7 Re d f

S12 CIVE280 Final Formulas v1

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Page 1: S12 CIVE280 Final Formulas v1

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

 

 

   

Page 2: S12 CIVE280 Final Formulas v1

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 

 

   

Page 3: S12 CIVE280 Final Formulas v1

S12‐CIVE280  Final Exam Formulas, Conversions & Properties ‐‐ version 1  3/3