Class 11PhysicsFluid Mechanics and Surface TensionBernoulli's Theorem and Applications of Bernoulli's Theory
MediumWhy is it dangerous to stand on the edge of a platform near the tracks when a train is passing at high speed? Explain.
(N/A) When a train passes at high speed,the air in contact with the train moves with the same velocity as the train. According to Bernoulli's principle,as the velocity of the air increases,its pressure decreases. This creates a region of low pressure between the person and the train. Since the air pressure further away from the train remains higher,a net pressure difference is created. This pressure difference exerts a force on the person directed towards the train,which can pull the person towards the moving train,making it dangerous.
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DifficultJEE MAIN 2025
View SolutionAn $L$-shaped glass tube is just immersed in flowing water as shown. If the speed of the water current is $V$,then the height $h$ up to which the water rises will be
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View Solution$A$ plane is in level flight at constant speed and each of its two wings has an area of $25 \; m^{2}$. If the speed of the air is $180 \; km/h$ over the lower wing and $234 \; km/h$ over the upper wing surface,determine the plane's mass in $kg$. (Take air density to be $1 \; kg \; m^{-3}$ and $g = 9.8 \; m/s^{2}$).
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View SolutionDetermine the pressure difference in a tube of non-uniform cross-sectional area as shown in the figure. $\Delta P = ?$ (in $Pa$)
$d_{1} = 5 \, cm, V_{1} = 4 \, m/s, d_{2} = 2 \, cm, V_{2} = ?$
Assume the fluid is water with density $\rho = 1000 \, kg/m^{3}$.
$d_{1} = 5 \, cm, V_{1} = 4 \, m/s, d_{2} = 2 \, cm, V_{2} = ?$
Assume the fluid is water with density $\rho = 1000 \, kg/m^{3}$.
MediumAIIMS 2019
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