Theory T.1,2,3

Question 1

What are the kinds of errors?

Answer 1

1. Systematic error - The error of the device
2. Random errors - We discover them with the error of dispersion (max-min)/4

Question 2

What is the name of the mathematical expression that represent the data based on minimizing the squared difference between theoretical and experimental values?

Answer 2

Least square fitting

Question 3

The correlation coefficient is in a scale between?

Answer 3

0-1

Question 4

In the best case the correlation coefficient to the data is really close to…

Answer 4

1

Question 5

If the correlation to the data is really bad is close to..

Answer 5

0

Question 6

We consider the ideal fluids the fluids that…

Answer 6

viscosity = 0

Question 7

What is the name of the capacity to flow, is the friction between the layers of atoms?

Answer 7

Viscosity

Question 8

What is the name of the principle that said that a changing pressure applied to a liquid contained in a container is transmitted equally to all points of the fluid and to the walls of the container itself?

Answer 8

Pascal principle

Question 9

What is the physiological effect of low pressure?

Answer 9

Hypobaric hypoxia

Question 10

What is the physiological effect of high pressure?

Answer 10

Under water dives, sickness

Question 11

What is the application of the pascal pressure?

Answer 11

Blood pressure cuff

Question 12

What is the name of the principle that said that the volume of the objects is the same as the volume of the fluid displaced?

Answer 12

Arquímedes principle

Question 13

How is the Bernoulli regime?

Answer 13

Stationary, laminar and non-viscous

Question 14

How is the Poiseuille regime?

Answer 14

Stationary, laminar and viscous

Question 15

How is the Venturi regime?

Answer 15

Stationary, turbulent and viscous

Question 16

Applications of the Bernoulli equation?

Answer 16

• Air masks
• Airplane wings

Question 17

What is going to affect viscosity?

Answer 17

• Temperature
• Pressure

Question 18

How temperature affect the viscosity of liquids?

Answer 18

+ T –> -Viscosity

Question 19

How temperature affect the viscosity of gasses?

Answer 19

+T –> +viscosity

Question 20

How pressure affect the viscosity of liquids?

Answer 20

Not affect

Question 21

How pressure affects the viscosity of gasses?

Answer 21

+P –> +viscosity

Question 22

We use the Reynolds number en what kind of flow?

Answer 22

Turbulent flow

Question 23

To prevent the turbulence we put filters because water tends to…

Answer 23

be turbulent

Question 24

How viscosity affect the speed?

Answer 24

+ viscosity –> - speed

Question 25

What are the applications of the sedimentation rate?

Answer 25

- Antibiotics - Creams - Food Industry - Blood test

Question 26

Whats the name of the force per unit area required for the movement of fluid?

Answer 26

shear stress

Question 27

In the Newtonian fluids their viscosity...

Answer 27

does not change with the shear stress

Question 28

In Non-Newtonian fluids their viscosity...

Answer 28

change with shear stress

Question 29

In the dilatant it's viscosity ...

Answer 29

increase with shear stress

Question 30

What are the name of the fluids that when fluids begin to flow when a shear stress reaches a limit and from then on they are Newtonian?

Answer 30

Bingham or ideal plastics

Question 31

What are the name of the fluids that when fluids with a fluidity threshold and from there its viscosity decreases with the shear force?

Answer 31

Non-Bingham plastics

Question 32

What is the name of the variation of velocity along a given direction?

Answer 32

Shear rate

Question 33

The reogram allows the..

Answer 33

classification of different types of fluids

Question 34

What are the two types of reograms?

Answer 34

- Ostwald reological model - Bingham reological model

Question 35

What are the applications of the shear stress and the shear rate?

Answer 35

- Aritificial tears (non-bingham plastics) - Drops with drugs (Pseudoplastics)

Question 36

Relationship between temperature and surface tension?

Answer 36

+T --> -surface tension

Question 37

How can we medicaly applicate the surface tension?

Answer 37

Ear drops (contain alcohol that decrease the surface tension)

Question 38

If we have a lower surface tension we will have smaller or bigger drops?

Answer 38

smaller drops

Question 39

The laplace ecuation is use for the..

Answer 39

difference in pressure inside and outside the drop.

Question 40

For bubbles the laplace equation is multiply by...

Answer 40

2

Question 41

The laplace equation is applicate in..

Answer 41

Pulmonary surfactant

Question 42

We meausre more than one drop to decrease...

Answer 42

error

Question 43

How is name the curvature of the surface of a liquid in response to the surface of the container?

Answer 43

Meniscus

Question 44

The contact angle is caused by 2 forces..

Answer 44

Fa - Adhesive force Fc - Cohesive force

Question 45

What time of meniscus we will have if the Fa>Fc

Answer 45

Ascending meniscus

Question 46

What time of meniscus we will have if the Fa=Fc?

Answer 46

Neutral meniscus

Question 47

What time of meniscus we will have if the Fa

Answer 47

Descending meniscus

Question 48

The contact angle is seen in the...

Answer 48

lotus effect

Question 49

The capilarity is when in a tube narrow enough so opposing meniscus come together forming a..

Answer 49

spgerical surface

Question 50

In capilarity the resulting forces of surface tension result in..

Answer 50

- Rise to upward forces (cancave meniscus) - Rise downward forces (convexe meniscus)