8.1 Physics Flashcards Preview

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Flashcards in 8.1 Physics Deck (45):
1

What is the SI system based on?

The metric system, must be used by law throughout the world

2

What are the fundamental units in physics/aerodynamics?

Mass
Length
Time
Temperature

3

What is mass measured in

Kilograms (KG)

4

What is the mass of 1KG defined by

A piece of platinum alloy at the office of weights, Paris.

Volume of 1L of pure water at 4 degrees Celsius

5

How is length measured

Meters (M)

6

What is light defined as

A fraction of unchangeable speed of light

7

What is the unit measure of temperature

Kelvin (K)

8

What are the 6 basic fundamental quantities

Speed
Acceleration
Power
Pressure
Force
Work

9

What is speed

A distance an object covers over a unit of time

10

What is acceleration

Change in speed
---------------------
Time change takes place

11

What is acceleration denoted by

M/s squared

12

What is speed denoted by

V (velocity)

13

What is acceleration due to gravity denoted by

g

14

What is the average acceleration due to gravity

9.81 meters/second squared

15

What is weight measured in

N (newtons)

16

What is Newton's second law

F=MA

17

What is work done

An object moved over a distance

Work=NM
Work = force x distance

18

What is work done denoted by

Joule (j) also measured in newton meters

19

What is power

Work over time or more specifically

Force x Distance
------------------
Time

20

How is power measured

Watts ( also n/m per second)

21

What is pressure

Pressure = force
-------
Area

22

What is pressure donated by

A small p ( measured in newton per square meter)

23

How is static pressure calculated

Height x density x gravity

24

Which way does dynamic pressure act

The direction of the flow

25

How is dynamic pressure calculated

1/2 density x V squared

26

What is dynamic pressure denoted by

Small q

27

What is 1 bar equal to in pascal

100,000

28

How is static pressure denoted for aircraft technical systems

Bar/ deca newtons per square centimetre

29

What is the speed of sound denoted by

a

30

Sound waves are the same as what

Pressure waves

31

Is the speed of sound higher or lower at low temperatures

Lower

32

What are the 3 main categories of aircraft speed

Subsonic
Transonic
Supersonic

33

What is the Mach number used for

Keep the pilot informed of the relationship between the speed of the aircraft and the speed of sound.

34

What is the equation of Mach number

Speed of aircraft
-----------------
Speed of sound

35

What is the lowest layer in the atmosphere

Troposphere

36

What atmospheric layer would you find rain clouds

Troposphere

37

What is the tropopause

The boundary layer between the troposphere and stratosphere

38

What is the stratosphere

Atmospheric layer above the troposphere - no rain clouds are found here

Temp does not change as altitude increases

39

What are the heights is the tropopause over the

- north/ south poles

- equator

- 8KM over north and south poles

- 16KM over equator

40

What variables can vary in the troposphere

Temperature, pressure, density

41

A standard atmosphere was introduced by who

ICAO

42

Standard altitude of tropopause above earth is?

11KM

43

Does temperature change at all in the tropopause

Yes, at the rate of 6.5 degrees per KM

-56.5 at height of tropopause

No temp change in stratosphere

44

What usually decreases with altitude

Density and pressure

45

What are density, temperature, pressure at sea level

Temp - 288k
Density - 1.225 kg/m cubed
Pressure - 1013.25 hecto pascal