Why is it dangerous to stand on the edge of platform near the line, when the train is passing with speed ? Explain.

Vedclass pdf generator app on play store
Vedclass iOS app on app store

When the train is passing with speed the contact air have same velocity of train. Hence according to Bernoulli's equation, low pressure is generated at that region whereas the pressure is more at far region. So, due to the pressure difference the force acts on person towards the train and he is pulled toward the train.

Similar Questions

A tank with a small hole at the bottom has been filled with water and kerosene (specific gravity $0.8$). The height of water is $3\,m$ and that of kerosene $2\,m$. When the hole is opened the velocity of fluid coming out from it is nearly ........ $ms^{-1}$ .(take $g\, = 10\, m s^{-2}$ and density of water $= 10^3\, kg\, m^{-3}$)

  • [JEE MAIN 2014]

A tube is attached as shown in closed vessel containing water. The velocity of water coming out from a small hole is :

A train with cross-sectional area $S _{ t }$ is moving with speed $v_t$ inside a long tunnel of cross-sectional area $S _0\left( S _0=4 S _{ t }\right)$. Assume that almost all the air (density $\rho$ ) in front of the train flows back between its sides and the walls of the tunnel. Also, the air flow with respect to the train is steady and laminar. Take the ambient pressure and that inside the train to be $p _0$. If the pressure in the region between the sides of the train and the tunnel walls is $p$, then $p _0- p =\frac{7}{2 N } \rho v_{ t }^2$. The value of $N$ is. . . . .

  • [IIT 2020]

Obtain Bernoulli’s equation for steady, incompressible, irrotational and viscous liquid.

Water flows steadily through a horizontal pipe of variable cross-section. If the pressure of water is $P$ at a point where flow speed is $v$ , the pressure at another point where the flow speed is $2v$ , is (Take density of water as $\rho $ )