Download App

Mechanical Properties of Fluids — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysicsMechanical Properties of Fluids2 Marks
Question
The excess pressure inside a soap bubble is thrice the excess pressure inside a moving soap bubble. What is the ratio between the volume of the first and second bubble?
✓

Answer

Let $r_1$ and $r_2$ be the radii of soap bubbles, excess pressure in them are $\frac{4\sigma}{\text{r}_1}$ and $\frac{4\sigma}{\text{r}_2},$ where $\sigma$ is the surface tension. Given: $\text{P}_1=\text{3P}_2$$\frac{4\sigma}{\text{r}_1}=3\frac{4\sigma}{\text{r}_2}$
$\therefore\text{r}_2=3\text{r}_1$
Volume fo first to second bubble,$=\frac{\text{r}_1^3}{\text{r}^3_2}=\frac{1}{3^3}=\frac{1}{27}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from Mechanical Properties of Fluids→Mechanical Properties of Fluids — all question types→Physics STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

An ideal Carnot engine uses an ideal gas. The source temperature is 500 K and the arrival temperature is 375 K . If the engine takes 500 K cal from the source per cycle then estimate (a) efficiency of engine (b) work done per cycle (c) per heat dissipated in bicycle access.
→
Name the phenomena/ fields with which microscopic domain of physics deals. Which theory explains these phenomena?
→
Two loudspeakers are arranged facing each other at some distance. Will a person standing behind one of the loudspeakers clearly hear the sound of the other loudspeaker or the clarity will be seriously damaged because of the 'collision' of the two sounds in between?
→
Explain the difference between uniform velocity and variable velocity.
→
The average work done by a human heart while it beats once is 0.5J. Calculate the power used by heart if it beats 72 times in a minute.
→
Of the three stars in the sky, one is visible white the other red and the third blue. Which of these will have minimum temperature and which will have maximum temperature?
→
The average speed of a snail is 0.020 miles/hour and that of a leopard is 70 miles/hour. Convert these speeds in SI units.
→
Rule out or accept the following formulae for kinetic energy on the basis of dimensional arguments.
  1. $\text{K}=\frac{3}{16}\text{mv}^2$
  2. $\text{K}=\frac{1}{2}\text{mv}^2+\text{ma}$
  3. $\text{K}=\frac{1}{2}\text{mv}^2$
→
For a satellite orbiting in an orbit, close to the surface of earth, to escape, what is the percentage increase in the kinetic energy required?
→
Define the terms 'node' and 'antinode'?
→