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The force of surface tension acts tangentially to the surface whereas the force due to air pressure acts perpendicularly on the surface. How is then the force due to excess pressure inside a bubble balanced by the force due to the surface tension?
Concept: undefined >> undefined
When the size of a soap bubble is increased by pushing more air in it, the surface area increases. Does it mean that the average separation between the surface molecules is increased?
Concept: undefined >> undefined
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Frictional force between solids operates even when they do not move with respect to each other. Do we have viscous force acting between two layers even if there is no relative motion?
Concept: undefined >> undefined
Water near the bed of a deep river is quiet while that near the surface flows. Give reasons.
Concept: undefined >> undefined
If water in one flask and castor oil in other are violently shaken and kept on a table, which will come to rest earlier?
Concept: undefined >> undefined
A heavy mass is attached to a thin wire and is whirled in a vertical circle. The wire is most likely to break
Concept: undefined >> undefined
When a metal wire elongates by hanging a load on it, the gravitational potential energy is decreased.
Concept: undefined >> undefined
Which of the following is a mechanical wave?
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By a surface of a liquid we mean
Concept: undefined >> undefined
A cork floating in a calm pond executes simple harmonic motion of frequency
\[\nu\] when a wave generated by a boat passes by it. The frequency of the wave is
Concept: undefined >> undefined
An ice cube is suspended in vacuum in a gravity free hall. As the ice melts it
Concept: undefined >> undefined
When water droplets merge to form a bigger drop
Concept: undefined >> undefined
Air is pushed into a soap bubble of radius r to double its radius. If the surface tension of the soap solution in S, the work done in the process is
Concept: undefined >> undefined
Both the strings, shown in figure, are made of same material and have same cross section. The pulleys are light. The wave speed of a transverse wave in the string AB is
\[\nu_1\] and in CD it is \[\nu_2\]. Then \[\nu_1 / \nu_2\]
Concept: undefined >> undefined
If more air is pushed in a soap bubble, the pressure in it
Concept: undefined >> undefined
Two waves represented by \[y = a\sin\left( \omega t - kx \right)\] and \[y = a\cos\left( \omega t - kx \right)\] \[y = a\cos\left( \omega t - kx \right)\] are superposed. The resultant wave will have an amplitude
Concept: undefined >> undefined
If two soap bubbles of different radii are connected by a tube,
Concept: undefined >> undefined
Two periodic waves of amplitudes A1 and A2 pass thorough a region. If A1 > A2, the difference in the maximum and minimum resultant amplitude possible is
Concept: undefined >> undefined
The fundamental frequency of a string is proportional to
Concept: undefined >> undefined
A wave pulse passing on a string with a speed of 40 cm s−1 in the negative x-direction has its maximum at x = 0 at t = 0. Where will this maximum be located at t = 5 s?
Concept: undefined >> undefined
