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Calculate the force requried to take away a flat circular plate of radius 0.01 m form the surface of water The surface tension of water is 0.075 N/m




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Surface tension of water = T = 0.075 N/m

For a circular plate the force required is F = 2 π R  * T
   as the interface between the water, plate and air is a circle of radius R.

F = 2 * π * 0.01 * 0.075  Newtons
   = 0.00471 Newtons 
   = 471 dynes

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