THERMAL PHYSICS

Question 1

What Do You Convert Temperature In

Answer 1

Kelvins (K)

Question 2

How Do Convert Temperature To Kelvins

Answer 2

°C -> K ( +273 )

K -> °C ( -273 )

Question 3

Unit For Force

Answer 3

Newtons (N)

Question 4

Energy Units

Answer 4

Joul ( J )

KiloJouls ( KJ )

Question 5

Energy Description

Answer 5

Energy Transferred When Force Used To Push Object Over Distance (Nm)

Question 6

Power Units

Answer 6

Watts (W)

Question 7

Power Description

Answer 7

Amount Of Energy Transferred Per Second (Js-1)

Question 8

Pressure Units

Answer 8

Pascle (Pa)

KPa (KPa)

Question 9

Pressure Decription

Answer 9

Amount Of Force Applied Over Area Of Surface

Question 10

Work Is Done When

Answer 10

Force Moves Object & ⚡️ Is Transferred To Obj.

Greater Force, & Greater Distance Moved, More Work Is done

Question 11

Calculating work

Answer 11

Work Done = Force X Distance Moved

W = F x D

Question 12

Rearranging W = F x D

Answer 12

F = W \ D

D = W \ F

Question 13

Power Equasion

Answer 13

Power = Work Done / Time

Question 14

Amount Of Pressure Exerted By Gas Depends On

Answer 14

Volume Of Container

Number Of Gas Particles (Moles)

Tempreture of Gas

Question 15

The First Law Of Thermodynamics Is

Answer 15

Energy Cannot Be Made Or Destroyed, Transferred From One Form Into Another

Question 16

Sum Of All Energy Of Particles In System Called

Answer 16

Internal Energy

Question 17

What Symbol Is Given To Internal Energy

Answer 17

U

Question 18

🔼U =

Answer 18

Change In Internal Energy

Question 19

Q =

Answer 19

Energy Transferred To Or From System By Heating

Question 20

W =

Answer 20

Energy Transferred To Or From System By Doing Work

Question 21

Energy Transferred To Or From System Equation

Answer 21

🔼U = Q - W

Question 22

Process Of Transferring Energy Between Object Classified As

Answer 22

Isothermal

Adiabatic

Question 23

Isothermal Process

Answer 23

Temp Of System Remains Constant

E.g, Heating Pan Of Boiling Water

Question 24

Adiabatic Process

Answer 24

No Heat Transferred To\From System

E.g, Spray Can Example Of Adiabatic Expansion Of Gas

Question 25

Second Law Of Thermodynamics State

Answer 25

Heat Energy Never Flows Spontaneously From A Colder Object To Hotter Object

Question 26

Heat Pumps In Refrigeration

Answer 26

Compressor Condenser Coils Expansion device Evaporator Coils

Question 27

Condenser Coils Function In Refrigerator

Answer 27

Compress Coolant Vapour To Heat It Up

Question 28

Condenser Coils Function In Refrigerator

Answer 28

Remove Heat From Coolant & Transfer It To Surrounding Via Conduction & Radiation Thin Metal Coils Aid Conduction Condenses The Vapour Into Liquid

Question 29

Expansion Device Function In Refrigerator

Answer 29

Liquid Coolant Expand & Some Becomes Vapour, Which Decrease Its Temperature Expansion Is Adiabatic

Question 30

Evaporate Coils Function In Refrigerator

Answer 30

Remove Heat Energy From Fridge By Transferring To Coolant Energy Transferred Cause Coolant To Evaporate & Become Vapour

Question 31

Compressor Efficiency In Refrigerator

Answer 31

Heats Up When Condensing Vapour, Which Wastes Energy & Reduce Efficiency

Question 32

Condenser Coils Efficiency In Refrigerator

Answer 32

Cooling & Condensing Vapour Depends On Temp Difference b\w Coolant & Surrounding Not All Heat Can Be Removed From Coolant

Question 33

Expansion Device Efficiency In Refrigerator

Answer 33

Almost 100% Efficiency

Question 34

Evaporator Coils Efficiency In Refrigerator

Answer 34

Cooling Inside Fridge Depends On How Fast Heat Can Be Extracted From Fridge

Question 35

Intake Function In Petrol Engines

Answer 35

Fuel & Air Mixture Is Taken Into Prison

Question 36

Compression Function In Petrol Engines

Answer 36

Piston Compresses The Fuel & Air Mixture Adiabatically Volume Of Fuel & Air Mixture Decreases & Its Pressure Increases

Question 37

Ignition Function In Petrol Engines

Answer 37

Fuel & Air Mixture Is Ignited Causes Big Increase In Pressure & Temperature With No Change In Volume

Question 38

Expansion Function In Petrol Engines

Answer 38

Gas Expands Adiabatically & Does Work On Piston To Push Down Vol Of Gas Increase & Pressure Decreases

Question 39

Exhaust Function In Petrol Engines

Answer 39

Piston Opened, Which Decreases Pressure With No Change In Vol Gas Then Leaves Piston, Which Decreases The Vol

Question 40

Ideal gas equation

Answer 40

PV=nRT

Question 41

What Is P In PV=nRT

Answer 41

Pressure (Pa)

Question 42

V in PV=nRT

Answer 42

Volume (m^3)

Question 43

n in PV=nRT

Answer 43

N° of moles Of Gas

Question 44

T in PV=nRT

Answer 44

Temp (k)

Question 45

R in PV=nRT

Answer 45

Molar Gas (8.31Jk-1mol-1)

Question 46

P as a subject in PV=nRT

Answer 46

P= nRT/V

Question 47

V as a subject in PV=nRT

Answer 47

V= nRT/P

Question 48

n as a subject in PV=nRT

Answer 48

n= PV/RT

Question 49

T as a subject in PV=nRT

Answer 49

T=PV/nR

Question 50

Petrol engine intake

Answer 50

Fuel & air mixt taken into piston

Question 51

Compression in petrol engine

Answer 51

Pristine compress fuel & air mixt adiabatically Vol fuel & air ⬇️ Pressure ⬆️

Question 52

Ignition in petrol engines

Answer 52

Fuel & air mic ignited Cause big ⬆️ pressure & temp No change vol

Question 53

Expansion in petrol engine

Answer 53

Gas expands adiabatically, does work in piston to push it down Vol of gas ⬆️ & pressure ⬇️

Question 54

Exhaust in petrol engines

Answer 54

Piston open ⬇️ pressure no change vol Gas leaves piston ⬇️ vol