Asked by Bailey

A glass capillary tube with a radius of 0.2 mm is inserted into an open container filled with an unknown liquid, and the meniscus has an appearance as shown in the figure. It is found that the surface tension causes the liquid in the tube to rise a distance of 4 cm relative to the surface of the liquid outside the tube. If the density of the liquid is 1200 kg/m3, find the surface tension.
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