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