Classical Thinking

In airfoil, the streamlines are crowded above the wings of aeroplane more than those below it. This causes (during take off)

An airfoil has _____ .

Which of the following is NOT an example of application of Bernoulli's principle?

Maximum acceleration of the train in which a box lying on its floor will remain stationary, is $\left[{\mu }_s=0.15, \mathrm{g}=10 \mathrm{m} {\mathrm{s}}^{-2}\right]$

If$\mu , N$ and$S$ represent coefficient of friction, normal reaction and distance moved, then the general expression for work against friction is

Water is filled in a flask upto a height of$20 \mathrm{cm}$. The bottom of the flask is circular and has an area of$1 {\mathrm{m}}^2$. If the atmospheric pressure is $1.01\times {10}^5 \mathrm{Pa}$, the force exerted by water on the bottom is $\left[g=10 \mathrm{m} {\mathrm{s}}^{-2}, \rho =1000 \mathrm{kg} {\mathrm{m}}^{-3}\right]$

In streamline flow velocity of liquid at the bottom layer is $\_\_\_\_\_\_\_\_.$

Sudden fall of atmospheric pressure by a large amount indicates$\_\_\_\_\_\_\_\_ .$