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26 Cards in this Set

  • Front
  • Back
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