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26 Cards in this Set
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Fluids

Liquids + gases

Density

mass/volume

Specific gravity

density of substance/density of water

Density of water

1000 kg/m^3

Pressure

force/area, force acting perpendicular to the surface

Units of pressure

Pa, pascal

Hydrostatic gauge pressure

p gauuge = density fluid * g * depth

P total

P on surface + P gauge

Buoyant force

Net upward force on the object in fluid

Archimedes Principle

The strength of the buoyant force is equal to the weight of the fluid displaced by the object
F = density * volume * g 
Object will float if

density of object < density of fluid

Object will sink if

density of object> density of fluid

Pasxals Law

F1/A1 = F2/A2

Flow rate

f = Av, how much fluid flows per unit time
A  cross sectional area v  average speed of flow 
Flow speed

How fast fluid moving

Continuity Equation

A1v1 = A2V2

If the tube narrows, speed will

increase

if the tube widens speed will

decrease

Conditions for ideal fluid

1.incompressible
2.no friction (viscosity) 3.flow is smooth 4. flow rate is steady 
Bernoullis equation

P1 + 1/2 pv1^2 + pgy1 = P2 + 1/2 pv2^2 + pgy2
p  density y height 
Stress

force/area

Is stress same as pressure

no, force in stress equation doesnt have to be perpendicular to the surface as in pressure

Strain

CHange, change in length/original length

Hookes law

stress = modulus * strain

Tenison/compression

L = FL/EA, flea, E youngs modulus

Shear

X = FL/AG, flag
