Class 11PhysicsFluid Mechanics and Surface TensionBernoulli's Theorem and Applications of Bernoulli's Theory
EasyWhy does a flag (or ensign) flutter when there is strong wind? Explain.
(N/A) When there is strong wind,the air flows rapidly over the surface of the flag. According to Bernoulli's principle,for a horizontal flow of fluid,an increase in the speed of the fluid occurs simultaneously with a decrease in pressure.
Since the wind speed is high at the free end of the flag,the pressure there becomes low.
However,the pressure near the support (pole) remains relatively higher.
This pressure difference creates a force that causes the flag to oscillate or flutter.
Since the wind speed is high at the free end of the flag,the pressure there becomes low.
However,the pressure near the support (pole) remains relatively higher.
This pressure difference creates a force that causes the flag to oscillate or flutter.
Explore More
Similar Questions
$A$ jet plane flies in the air because
Easy
View SolutionAn ideal liquid flows through a horizontal tube of variable diameter. The pressure is lowest where the . . . . . . .
$Assertion :$ The velocity of flow of a liquid is smaller when pressure is larger and vice-versa.
$Reason :$ According to Bernoulli's theorem,for the stream line flow of an ideal liquid,the total energy per unit mass remains constant.
$Reason :$ According to Bernoulli's theorem,for the stream line flow of an ideal liquid,the total energy per unit mass remains constant.
Write the limitations of Bernoulli's equation.
Medium
View SolutionThe figure shows a liquid of given density flowing steadily in a horizontal tube of varying cross-section. The cross-sectional areas at $A$ is $1.5 \, cm^2$,and at $B$ is $25 \, mm^2$. If the speed of the liquid at $B$ is $60 \, cm/s$,then find $(P_A - P_B)$ in $Pa$. (Given: $P_A$ and $P_B$ are liquid pressures at points $A$ and $B$ respectively. Density $\rho = 1000 \, kg/m^3$. $A$ and $B$ are on the axis of the tube.)
DifficultJEE MAIN 2023
View SolutionVedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo