Question

Calculate the force required to take away a flat circular plate of radius 0.01 m from the surface of water. The surface tension of water is 0.075N / m. (Ans : 0.004713 N)

Answer 1

Given:

Radius of circular plate   =  r =       0.01 m        

Surface Tension      =   T  =       0.075 N / m

T = F / L

Therefore,

F = T L

F = T X ( 2 π r)

F = 0.075 X 2 X π X 0.01

F = 0.004713 N

The force required to take away a flat circular plate of radius 0.01 m from the surface of water is F = 0.004713 N

Answer 2

Give example of function which are continuous but not differentiable