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Fluid-Mechanics
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The radii of two soap bubbles are R1 and R2 respectively. The ratio of masses of air in then will be
The correct answer is:
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Two very wide parallel glass plates are held vertically at a small separation d and dipped in water. Some water climbs up in the gap between the plates. Let S be the surface tension of water, p0 = atmospheric pressure, p = pressure of water just below the water surface in the region between the plates. Then (assume hemispherical meniscus)
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There is an air bubble of radius R inside a drop of water of radius 3R. Find the ratio of gauge pressure at point B to that at point A.
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A piece of brass (Cu and Zn) weighs 12.9 g in air. When completely immersed in water, it weighs 11.3g. Then relative densities of Cu and Zn are 8.9 and 7.1 respectively. The mass of copper in the alloy is
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A 0.5 kg block of brass (density; 
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The volume of the hollow portion of a sphere is 
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