Chapter 4- Fluids

Question 1

Density of water

Answer 1

1g/cm^3 or 1000kg/m^3

Question 2

Weight of a volume

Answer 2

Fg= pVg

used for buoyancy problems

Question 3

Specific gravity

Answer 3

Density / (1g/cm^3) OR density / (1000kg/m^3)

Question 4

Pressure

Answer 4

Force / Area (units- Pa)

1Pa = 1N/m^2

Question 5

Absolute (hydrostatic) pressure. Def and equ

Answer 5

Total pressure exerted on submerged object in fluid (liquid or gas)
P = P* + pgz
P*- pressure at surface
z- depth of object

Question 6

What does increasing pressure do to boiling point of water in food?

Answer 6

Raises it. This is how pressure cookers work

Question 7

Gauge pressure

Answer 7

Difference between absolute pressure in and outside

P- Patm

Question 8

Hydrostatics

Answer 8

Study of fluids at rest and forces and pressures associated with standing fluids

Question 9

Pascals principle

Answer 9

With uniform fluids the pressure depends only height of fluid

Question 10

Pascals principle (force and area Pistons/ hydraulic lift)

Answer 10

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

Question 11

Area of a circle

Answer 11

pi r^2

Question 12

Buoyant force

Answer 12

Fbuoy= pfluid Vfluiddisplaced g = pfluid Vsubmerged g

USE DENSITY OF FLUID**

Question 13

Relationship between radius and pressure

Answer 13

Inverse exponential to the fourth power. r^4🔺P

Question 14

Continuity equation

Answer 14

v1A1 = v2A2

Question 15

Bernoullis equation

Answer 15

P1 + (1/2)pv^2 + pgh

Question 16

Dynamic pressure

Answer 16

(1/2)pv^2

Question 17

Static pressure

Answer 17

P + pgh

Question 18

Venturi effect

Answer 18

Smaller radius of tube = higher pressure and so liquid will not be near the edges because it’s moving faster down the narrower part of the tube

Question 19

change in pressure =

Answer 19

(density)(gravity)(change in height)