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M8 > M8.1 > Flashcards

M8.1 Flashcards

1
Q

Are sound waves the same as pressure waves?

A

Yes

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2
Q

What is the unit for mass?

A

Kilograms (KG)

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3
Q

What do you use to work out Mach number, speed of aircraft, speed of sound?

A

Use the triangle method

  • top= speed of aircraft
  • bottom left= Mach number
  • bottom right= speed of sound
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4
Q

What is the standard altitude and temperature of the tropopause?

A

11 kilometres with a temperature of -56.5 Celsius

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5
Q

What is subsonic?

A

Aircraft speed below speed of sound

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6
Q

What is one bar equal to?

A

100,000 pascal

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7
Q

What is Mach number?

A

M=speed of Aircraft / speed of sound

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8
Q

What is the standard atmosphere known as?

A

ISA (ICAO standard atmosphere)

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9
Q

What are the four fundamental units in aerodynamics?

A
  • mass
  • length
  • time
  • temperature
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10
Q

What is work?

A

Work is done when an object is moved over a distance.

work=Force x Distance

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11
Q

What is Newton’s second law?

A

F = MxA

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12
Q

What is Newton’s 1st law?

A

Something at rest will stay at rest unless an external force is acted on it

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13
Q

How is static pressure calculated?

A

(Height x density) x gravity

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14
Q

What is the troposphere?

A

The lowest layer of the atmosphere

16km at the equator and 8km at the poles

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15
Q

Who stated the internal standard atmosphere figures?

A

International civil aviation organisation (ICAO)

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16
Q

What does SI stand for?

A

International system (system international for french)

17
Q

What are the three speeds of sound?

A
  • subsonic
  • transonic
  • supersonic
18
Q

What is the formula for speed of sound?

A

a=20(square root of temperature)

19
Q

What is the value of gravity?

A

9.8 m/s^2

20
Q

What is power?

A

Power is work over time?
P= (FxD)/T
Measured in watts

21
Q

What is Newton’s third law?

A

Every action has an equal and opposite reaction

22
Q

What is the equation for force?

A

F=MxA

Measured in Newton’s

23
Q

At what rate does the temperature decrease with altitude in the stratosphere?

A

It doesn’t, stays uniform at -56.5 Celsius

24
Q

What is transonic?

A

Aircraft speed is the same of the speed of sound

25
Q

At what rate does the temperature decrease with altitude in the troposphere?

A

6.5 Celsius per kilometre

26
Q

What is a tropopause?

A

The top of the troposphere

27
Q

What is weight measured in?

A

Newtons

28
Q

What does the speed of sound depend on?

A

Temperature

29
Q

What is supersonic?

A

All speed above speed of sound

30
Q

What is pressure?

A

Pressure is the force acting on a unit of area

P=F/A

Measured in pascals

31
Q

What is the standard figures at sea level?

A

Temperature: 288K
Density: 1.225KG/m3
Pressure: 1013.25Pa

M8 (4 decks)

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