Surface tension questions. 1 ) The water strider is an insect that can float and walk on the surface of lakes, ponds, and rivers. Assuming that the weight of a water strider is 0.1 mN, and it has four long feet (it has two short feet in the front as well, but we are ignoring them). Each foot bears of its weight and can be approximated as a cylin

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Surface tension questions. 1 ) The water strider is an insect that can float and walk on the surface of lakes, ponds, and rivers. Assuming that the weight of a water strider is 0.1 mN, and it has four long feet (it has two short feet in the front as well, but we are ignoring them). Each foot bears  of its weight and can be approximated as a cylinder of radius 100 ?m, lying horizontally on water. Assuming that the liquid-air interface in contact with the feet is pointed 45 degrees upwards (see the schematic). Surface tension of water-air interface is 72 mN/m  a. What is the minimum length of each foot required to support its weight? b. The actual length of each foot is 5 mm. How many times of its weight can the legs support?   2) Introduce another method of measuring surface/interface tension, discuss some potential advantages or disadvantages of this method compared to other methods  (b)

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