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26 Cards in this Set
- Front
- Back
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Fluids
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Liquids + gases
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Density
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mass/volume
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Specific gravity
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density of substance/density of water
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Density of water
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1000 kg/m^3
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Pressure
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force/area, force acting perpendicular to the surface
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Units of pressure
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Pa, pascal
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Hydrostatic gauge pressure
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p gauuge = density fluid * g * depth
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P total
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P on surface + P gauge
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Buoyant force
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Net upward force on the object in fluid
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Archimedes Principle
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The strength of the buoyant force is equal to the weight of the fluid displaced by the object
F = density * volume * g |
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Object will float if
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density of object < density of fluid
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Object will sink if
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density of object> density of fluid
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Pasxals Law
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F1/A1 = F2/A2
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Flow rate
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f = Av, how much fluid flows per unit time
A - cross sectional area v - average speed of flow |
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Flow speed
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How fast fluid moving
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Continuity Equation
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A1v1 = A2V2
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If the tube narrows, speed will
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increase
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if the tube widens speed will
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decrease
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Conditions for ideal fluid
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1.incompressible
2.no friction (viscosity) 3.flow is smooth 4. flow rate is steady |
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Bernoullis equation
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P1 + 1/2 pv1^2 + pgy1 = P2 + 1/2 pv2^2 + pgy2
p - density y- height |
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Stress
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force/area
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Is stress same as pressure
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no, force in stress equation doesnt have to be perpendicular to the surface as in pressure
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Strain
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CHange, change in length/original length
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Hookes law
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stress = modulus * strain
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Tenison/compression
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L = FL/EA, flea, E youngs modulus
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Shear
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X = FL/AG, flag
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