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

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) The force of surface tension acting on the slider of length $l$ in the upward direction balances the force due to the weight $W$ acting in the dow

Vedclass · Accepted Answer

$0.025$

Vedclass · Answer

(D) The force of surface tension acting on the slider of length $l$ in the upward direction balances the force due to the weight $W$ acting in the downward direction.$A$ liquid film has two surfaces,so the total upward force due to surface tension is $F = 2Tl$,where $T$ is the surface tension.Given:Weight $W = 1.5 	imes 10^{-2} \ N$Length $l = 30 \ cm = 0.3 \ m$Equating the forces:$2Tl = W$$2 	imes T 	imes 0.3 = 1.5 	imes 10^{-2}$$0.6T = 1.5 	imes 10^{-2}$$T = \frac{1.5 	imes 10^{-2}}{0.6}$$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 $N/m$)

Similar Questions

The half-life period of a radioactive element $X$ is the same as the mean lifetime of another radioactive element $Y$. Initially, both of them have the same number of atoms. Then:

The time period of a second's pendulum is $2\, s$. The spherical bob,which is empty from inside,has a mass of $50\, g$. This is now replaced by another solid bob of the same radius but having a mass of $100\, g$. The new time period will be .... $s$.

Which of the following statements is correct?

Which of the following is not true for a eukaryotic cell?

The binding energy per nucleon versus mass number curve for nuclei is shown in the figure. $W, X, Y$ and $Z$ are four nuclei indicated on the curve. The process that would release energy is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module