Liquid flow and Bernoulli’s equation
Answers are for parents and teachers.
1
A pipe narrows from 50 cm² to 10 cm². The speed in the wide part is 0.2 m/s. What is it in the narrow part (m/s)?
1
2
In a horizontal pipe υ₁ = 3 m/s, υ₂ = 7 m/s, ρ = 1000 kg/m³. What is the pressure difference (Pa)?
20000
3
The water flow in a pipe is 6 L/s (0.006 m³/s). What is the speed (m/s) where the cross-section is 30 cm² = 0.003 m²? (υ = Q/S)
2
4
Why is the end of a fire hose made narrow?
The speed is higher in the narrow part, so the jet reaches farther.
5
Name the three terms of Bernoulli’s equation.
p – static pressure, ρgh – hydrostatic pressure, ρυ²/2 – dynamic pressure.