Chapter 13: Fluids Flashcards

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1
Q

what is density?

A

density can be thought of as mass per unit volume, the units are kg/m^3
ρ = m / V

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2
Q

what is meant by ‘specific gravity’?

A

specific gravity is a ratio of the density of a substance to the density of water which is useful in the study of fluids (density of the object / density of the fluid)
SG = ρ(o) / ρ(f)

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3
Q

what is pressure?

A

pressure is force per unit area, it is a scalar (not a vector), SI units are N/m^2
P = F / A = ρgh

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4
Q

calculating force due to water pressure?

A

y = 0 at the surface level
determine the y0 and yf values for the area of interest, integrate the area with respect to depth (dy) times ρg(other variables involved with area including y)

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5
Q

SI value of pressure of the atmosphere at sea level?

A

1.013x10^5 N/m^2

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6
Q

how do you get absolute pressure?

A

gauge pressure + atmospheric pressure = absolute pressure

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7
Q

archimedes principle

A

the buoyant force on an object immersed in a fluid is equal to the weight of the fluid displaced by that object (volume of the solid replaced by water ‘weight’)

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8
Q

Formula for buoyant force

A
F(B) = (weight of object) - (weight of the volume of water displaced by the object)
F(B) = (mg) - (ρ(w) * V * g)
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9
Q

density of water

A

1x10^3 kg/m^3

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10
Q

equation of

A
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