Created by StemPy LabTwo soap bubbles, of radii and , are blown from the same soap solution (surface tension ). They touch and stick together, so that a single curved soap film separates the air inside one from the air inside the other. What is the radius of curvature of this film?
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← A kitchen tap fills a 2.0 litre jug in 12.5 s. The water leaves the round mouth of the tap, of area 1.6 cm², and falls straight down as a smooth stream. Ignore air resistance and surface tension, and take g = 10 m/s². How far below the mouth of the tap is the cross-section of the stream one third of the area of the mouth? Give the answer in cm.A small steel ball falls through glycerine at a steady terminal speed of 2.0 cm/s. A second ball, of the same steel but with twice the radius, is tied to the first by a short, light thread, and the pair is released in the same glycerine with the large ball below the small one. Stokes' law holds for each ball, and each feels the same drag it would feel alone (ignore the effect of one ball on the flow round the other). What is the terminal speed of the pair? Give the answer in cm/s. →
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