Fluids

Question 1

Is density a scalar or vector?

Answer 1

Scalar

Question 2

Equation for density

Answer 2

Density=(mass)/(volume)

Question 3

Density of water in g/(cm^3)

Answer 3

1

Question 4

Density of water in kg/(m^3)

Answer 4

1000

Question 5

Units of density

Answer 5

kg/(m^3)
g/mL
g/(cm^3)

Question 6

Equation for density using g

Answer 6

F=density(V)(g)

F is the weight

Question 7

Parameters for specific gravity

Answer 7

1atm

4 degrees C

Question 8

Equation for specific gravity

Answer 8

SG=(density)/(1g/(cm^3))

Question 9

Equation for pressure

Answer 9

P=F/A

Force per unit area

Question 10

What is a pascal equal to?

Answer 10

N/(m^2)

Question 11

1atm is equal to? Pa, mmHg, torr

Answer 11

1.013x10^5 Pa
760 mmHg
760 torr

Question 12

Equation for absolute pressure

Answer 12

P=P0+density(g)(depth)

Question 13

P0 in equation for absolute pressure

Answer 13

Ambient pressure - pressure at the surface

Question 14

Equation for gauge pressure

Answer 14

Pg=P-Patm

Question 15

Pascal’s Principle

Answer 15

Given an incompressible fluid, a change in pressure will be distributed to all molecules and wall of vessel

Question 16

Equation for Pascal’s Principle?

Answer 16

P=(F1/A1)=(F2/A2)

Question 17

Equation for work of an isobaric process?

Answer 17

W=P(deltaV)

Question 18

Equation for buoyant force?

Answer 18

Fb=density(fluid)V(fluid displaced)g=density(fluid)V(submerged)g

Question 19

Surface tension

Answer 19

Thin but strong layer formed by cohesive forces at the top of a liquid

Question 20

Cohesive forces

Answer 20

Attractive force between liquid molecules to one another

Question 21

Adhesive forces

Answer 21

Attractive force between liquid molecules to another substance

Question 22

What forms when adhesive forces are stronger than cohesive forces?

Answer 22

Concave meniscus

Question 23

What forms when cohesive forces are stronger than adhesive forces?

Answer 23

Convex meniscus

Question 24

Unit of viscosity

Answer 24

Pa-s (N*s)/(m^2)

Question 25

What type of flow is smooth and orderly?

Answer 25

Laminar flow

Question 26

Equation for flow rate using Poiseuille’s Law?

Answer 26

Q=(pi(r^4)(changeP))/(8nL)

n - viscosity

Question 27

What type of flow is rough and disorderly?

Answer 27

Turbulent flow

Question 28

Critical speed

Answer 28

Speed above which turbulence will arise

Question 29

Equation for critical speed

Answer 29

Vc=((Nr)(n))/(pD)
Nr is a constant
n is viscosity
p is density
D is diameter of tube

Question 30

Equation for flow rate with area

Answer 30

Q=v1A1=v2A2

Question 31

Relationship between linear speed and area

Answer 31

Inversely, speed increases with decreasing area

Question 32

What is Q=v1A1=v2A2 known as?

Answer 32

Continuity equation

Question 33

Equation for dynamic pressure?

Answer 33

.5p(v^2)
p is density
v is linear speed

Question 34

Equation for static pressure?

Answer 34

P+pgh
P is absolute pressure
p is density
g is gravity
h is height above datum

Question 35

Bernoulli’s Equation

Answer 35

P1 + .5p(v1^2) + pgh1 = P2 + .5p(v2^2) + pgh2

Question 36

Venturi Effect

Answer 36

Fluid in the tube will decrease as area decreases, speed increases and pressure decreases

Question 37

Is the pressure gradient positive or negative during inspiration?

Answer 37

Negative

Question 38

Is the pressure gradient positive or negative during expiration?

Answer 38

Positive