Week 1

Question 1

What are the two types of properties of a system?

Answer 1

Extensive Properties (depend on the size or extent of a system e.g mass, volume and energy) and Intensive Properties( Independent of system size e.g Density , temperature and pressure)

Question 2

What type of property makes examples like Specific internal energy and specific volume

Answer 2

Intensive by dividing through by mass

Question 3

What base unit system do we use?

Answer 3

Système International d’unites(SI)

Question 4

What Country doesn’t use SI units in Engineering?

Answer 4

USA

Question 5

What is the SI unit of mass, length and time?

Answer 5

Kilogram,Meter and seconds

Question 6

Convert 1km to meters

Answer 6

1km=1000m

Question 7

What are the SI prefixes for 10^6, 10^9, and 10^-3?

Answer 7

Mega(M), Giga(G) and Milli(m)

Question 8

Define Density and its equation.

Answer 8

Density is the mass of a fluid per unit volume.
p=m/v
where:
p= density
m=mass
v=volume

Question 9

What are the units of Denisty?

Answer 9

Kgm^-3

Question 10

What relationship does density and specific volume have?

Answer 10

Inverse Relationship

Question 11

What is the equation transformation showing inverse relationship for density and specific volume?

Answer 11

(v)=v/m
p=m/v
p=1/(v)

Question 12

What is specific gravity and how is it calculated?

Answer 12

Specific gravity is the ratio of a fluid’s density to a reference density (usually water).
σ= ρ /ρ0
ρ0= the density of water

Question 13

What is pressure and what is the equation to calculate it?

Answer 13

Pressure is a force distributed over an area.
p=f/A

Question 14

What is pressure on a molecular level?

Answer 14

Pressure of a gas is caused by particle collision density, higher pressure means higher rate of particle collisions. Pressure forces on an object acts normal to the surface.

Question 15

What are the units of pressure (SI)?

Answer 15

Pascal (Pa)
1Pa=1Nm^-2

Question 16

What is the pressure caused by the earth’s atmosphere at group level approximately?

Answer 16

101325Pa

Question 17

What is gauge pressure and its equation?

Answer 17

The working pressure above or below atmospheric conditions.
pgauage=pabsolute-patmosphere

Question 18

What is an example of Vertical Pressure Variation?

Answer 18

Diving into a swimming pool, the effect of pressure increases felt by discomfort in the ears.

Question 19

How do you calculate pressure when multiple fluids are involved?

Answer 19

p base= p1gh1+p2gh2+p3gh3+…

Question 20

What is the purpose of a manometer?

Answer 20

Manometers measure pressure using columns of fluid, exploiting the pressure-depth relationship.

Question 21

How is the force on an immersed surface calculated?

Answer 21

Force is the integral of pressure with respect to depth:
F=pgw(integral)h dh

Question 22

What is specific volume and how is it related to density?

Answer 22

Specific volume is the inverse of density
(v)=1/p