Fluids

Question 1

density units

Answer 1

kg/m^3

Question 2

density equation

Answer 2

m/v

Question 3

are fluids described in intensive properties or extensive

Answer 3

intensive

Question 4

what does changing the amount of a substance do to the density

Answer 4

does not change the density

Question 5

specific gravity

Answer 5

is the density of that substance compared to the density of water. density of substance/density of water

Question 6

how is specific gravity compared to water

Answer 6

if it is less than 1 it is less dense than water
if it is equal to 1 then it is equally as heavy as water
if it is greater than one it indicates a substance heavier than water

Question 7

density of water

Answer 7

1000kg/m^3

1g/cm^3

Question 8

impulse equation

Answer 8

the force of the collisions multiplied by the duration of collision (Fchange in time)

Question 9

average magnitude of force created by the collisions

Answer 9

force of the collisions multiplied by the duration of the collisions/ time over which the collisions occur

Question 10

pressure equation

Answer 10

P=F/A

Question 11

S.I. unit of pressure

Answer 11

Pascal (Pa)

Question 12

gauge pressure

Answer 12

is the pressure compared to the atmospheric pressure

Question 13

Fluids at rest pressure

Answer 13

P=rhogy (y is the depth of the fluid) g is the gravitational constant

Question 14

any fluid pressure open to the atmosphere can be found by

Answer 14

P=rhogy+Patm

Question 15

Pressure atmosphere equals

Answer 15

101,000 Pa

Question 16

Pascal’s principle

Answer 16

states that pressure applied anywhere to an enclosed incompressible fluid will be distributed undiminished throughout the fluid

Question 17

as you go higher in the atmosphere there is less

Answer 17

air pressure up there and fewer molecules above you which means less weight and lower pressure

Question 18

pressure measured relative to a vacuum is called

Answer 18

absolute pressure

Question 19

Pabsolute=

Answer 19

Pgauge+ Patm (requires a closed container)

Question 20

difference between gases and liquids as fluids

Answer 20

gases are compressible while liquids are incompressible

Question 21

a standing fluid exerts a forces called what on any object floating submerged or sunk in the fluid

Answer 21

buoyant force

Question 22

magnitude of the buoyant force experienced by an object whether floating, submerged, or sunk is

Answer 22

directly proportional to the volume of the fluid displaced

Fb=rhofluidVfluidg

Question 23

archimedes principle

Answer 23

shows that the upward buoyant force is equal in magnitude to the weight of the displaced fluid

Question 24

a sunk object displaces a volume of fluid equal

Answer 24

to its own volume

Question 25

floating object displaces Vfluid

Answer 25

with mass equal to its own mass

Question 26

Submerged object displaces Vfluid

Answer 26

with mass equal to its own mass and equal to its own volume

Question 27

Sunk objects displaces Vfluid

Answer 27

equal to its own volume

Question 28

molecules in fluids have two types of motion

Answer 28

random translational motion(pressure)

uniform tranlational motion

Question 29

viscosity is the measure

Answer 29

of the fluids willingness to flow

Question 30

ideal fluids lack turbulence and this is means that they experience

Answer 30

laminar flow (steady flow) means that any fluid flowing through one point has the same velocity

Question 31

continuity equation

Answer 31

Q=Av

Question 32

closer streamlines are to one another the

Answer 32

greater the velocity

Question 33

assuming constant height as velocity increases

Answer 33

pressure decreases

Question 34

venturi flow is used to

Answer 34

determine the velocity of a fluid flowing within it

Question 35

venturi effect is

Answer 35

when you decrease the cross-sectional area this leads to an increase in velocity in which there is a decrease in the pressure

Question 36

in a pipe where does the fluid have the biggest velocity

Answer 36

in the center

Question 37

pouseuille’s law describes

Answer 37

flow rate of real fluids

Question 38

water droplets are formed by

Answer 38

intermolecular forces pulling inward minimizing the surface area by creating a more spherical shape

Question 39

if the cohesive intermolecular forces are stronger in a tube with water

Answer 39

convex surface is formed as the fluid is pulled upward

Question 40

if the adhesive forces are stronger

Answer 40

concave surface is formed

Question 41

how does the body prevent alveolar collapse

Answer 41

surfactant