Question

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

Answer 1

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

Answer 2

Hey mate ^_^

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Answer:

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T (Surface tension of water) = 0.075 N/m

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  N

   = 0.00471 N

#Be