M8.1 Flashcards
Are sound waves the same as pressure waves?
Yes
What is the unit for mass?
Kilograms (KG)
What do you use to work out Mach number, speed of aircraft, speed of sound?
Use the triangle method
- top= speed of aircraft
- bottom left= Mach number
- bottom right= speed of sound
What is the standard altitude and temperature of the tropopause?
11 kilometres with a temperature of -56.5 Celsius
What is subsonic?
Aircraft speed below speed of sound
What is one bar equal to?
100,000 pascal
What is Mach number?
M=speed of Aircraft / speed of sound
What is the standard atmosphere known as?
ISA (ICAO standard atmosphere)
What are the four fundamental units in aerodynamics?
- mass
- length
- time
- temperature
What is work?
Work is done when an object is moved over a distance.
work=Force x Distance
What is Newton’s second law?
F = MxA
What is Newton’s 1st law?
Something at rest will stay at rest unless an external force is acted on it
How is static pressure calculated?
(Height x density) x gravity
What is the troposphere?
The lowest layer of the atmosphere
16km at the equator and 8km at the poles
Who stated the internal standard atmosphere figures?
International civil aviation organisation (ICAO)
What does SI stand for?
International system (system international for french)
What are the three speeds of sound?
- subsonic
- transonic
- supersonic
What is the formula for speed of sound?
a=20(square root of temperature)
What is the value of gravity?
9.8 m/s^2
What is power?
Power is work over time?
P= (FxD)/T
Measured in watts
What is Newton’s third law?
Every action has an equal and opposite reaction
What is the equation for force?
F=MxA
Measured in Newton’s
At what rate does the temperature decrease with altitude in the stratosphere?
It doesn’t, stays uniform at -56.5 Celsius
What is transonic?
Aircraft speed is the same of the speed of sound
