A cube of side a and mass on just floats on the surface of water as shown in the figure. The surface tension and density of water are `T` and `rho_(w)` respectively. If angle of contact between cube and water surface is zero, find the distance `h` (in metres) between the lower face of cube and surface of the water.
(Take `m=1kg, g=10ms^(-12), aT=10/4` unit and `rho_(w)a^(2)g=10` unit)

Answer

2

Explanation

`Mg+F_(ST)=B`
`mg+4aT=a^(2)hrho_(w)g`

`10+4xx10/4=10h`
`h=2m`