Consider the following two statements A and B | vedclass

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(B) Statement $A$ is true. The excess pressure inside a liquid drop is given by $P = \frac{2T}{R}$,where $T$ is the surface tension and $R$ is the rad

Vedclass · Accepted Answer

$A$ is true but $B$ is false

Vedclass · Answer

(B) Statement $A$ is true. The excess pressure inside a liquid drop is given by $P = \frac{2T}{R}$,where $T$ is the surface tension and $R$ is the radius of the drop. Since $P \propto \frac{1}{R}$,the excess pressure is inversely proportional to the radius. Therefore,a smaller drop has higher excess pressure than a larger drop.Statement $B$ is false. According to Bernoulli's principle,for an aeroplane wing,the shape is designed such that air flows faster over the top surface than the bottom surface. Higher speed results in lower pressure on the top surface and higher pressure on the bottom surface,which creates the lift force. Thus,the pressure is actually less on the upper surface and more on the bottom surface.

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