Heat in the capillary tube

Classical Mechanics Level 3

Lower end of capillary tube of radius r is placed vertically in water then the amount of heat evolved with rise of water in the capillary is?

Density of water is d d . Let h h be the rise in water level. g g is acceleration due to gravity.

+πr^2h^2dg/2 -πr^2h^2dg/2 -πr^2h^2dg +πr^2h^2dg

Avadhoot Sinkar by Avadhoot Sinkar , 22, India

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1 solution

Avadhoot Sinkar
Feb 4, 2016

First find the force due to surface tension in vertical direction. And thus work done by the force due to surface tension.Let this be W Then write an expression for rise in PE of water in the tube. Let this be ∆PE Thus heat = W-∆PE Hence heat =+ πr^2h^2dg/2

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