Pressure and speed in technology
Answers are for parents and teachers.
1
The hole is 20 m deep, g = 10. What is υ = √(2gh) (m/s)?
20
2
Wing area 30 m², pressure difference 1000 Pa. What is the lift (N)?
30000
3
An aircraft needs 45 000 N of lift and has a wing area of 15 m². What pressure difference (Pa) is needed?
3000
4
Why does a football kicked from the corner follow a curved path?
The ball spins; the air speed differs on its sides and the pressure difference deflects it (Magnus effect).
5
Describe the shape of an aircraft wing and compare the pressure above and below it.
The upper side is curved: air is faster, the pressure is lower; below, the pressure is higher.