2011 Flashcards
1
Q
What is gravitational field strength measured in?
A
N/kg.
2
Q
How does a safety wire reduce the dangers when fuelling?
A
Current in wire discharges aircraft.
3
Q
Advantages of digital signals?
A
Easier to remove noise.
4
Q
Difference between digital and analogue signals?
A
Digital only has set values but analogue has any value.
5
Q
Why do different frequencies require different speakers?
A
Waves spread out, have different wavelengths, they diffract more if the speaker matches the wavelength.
6
Q
How do crumple zones help prevent injury?
A
- Time for crash increases.
- Momentum decreases.
- Rate of change of momentum reduces.
- Smaller force leads to less severe injury.
