A thin liquid film formed between a U-shaped | vedclass

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(A) thin liquid film has two free surfaces,one on each side of the film.Therefore,the total upward force due to surface tension is $F = 2T\ell$,where

Vedclass · Accepted Answer

$0.025$

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(A) thin liquid film has two free surfaces,one on each side of the film.Therefore,the total upward force due to surface tension is $F = 2T\ell$,where $T$ is the surface tension and $\ell$ is the length of the slider.Given: Weight $W = mg = 1.5 	imes 10^{-2} \, N$,length $\ell = 30 \, cm = 0.3 \, m$.For equilibrium,the upward force must balance the downward weight:$2T\ell = mg$$T = \frac{mg}{2\ell}$$T = \frac{1.5 	imes 10^{-2}}{2 	imes 0.3}$$T = \frac{1.5 	imes 10^{-2}}{0.6}$$T = 0.025 \, N/m$.

$A$ thin liquid film formed between a $U$-shaped wire and a light slider supports a weight of $1.5 \times 10^{-2} \, N$ (see figure). The length of the slider is $30 \, cm$ and its weight is negligible. The surface tension of the liquid film is (in $, N/m$)

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