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Physics, 04.11.2019 22:31 catchonyet
The gecko is sticking upside down to a smooth ceiling. the remarkable adhesion might be due to static electricity. gecko feet are covered with microscopic hairs. when these hairs rub against a surface, charges separate, with the hair developing a positive charge and negative charge forming below the surface. there is an attractive force between the separated charges. this is an effective means of adhering to a surface, but it comes at a cost: two planes of charge are like two charged plates of a capacitor, which takes energy to charge. doubling the amount of charge on each surface increases the attractive force, but also increases the energy required to separate the charge. by what factor will this energy increase?
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Physics, 22.06.2019 18:50
Avertical clean glass piezometer tube has an inside diameter of d = 1 mm and is used to measure pressure in a horizontal pipe carrying water as shown. due to pressure in the pipe, the water at 20c rises into the tube to a height h. if the water pressure in the pipe is p = 500 pa gauge, estimate the height h: (a) without considering surface tension (b) with surface tension (capillary) effects. the contact angle can be assumed at 30 deg
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The gecko is sticking upside down to a smooth ceiling. the remarkable adhesion might be due to stati...
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