Question

A thin and light ring of the material of radius 3 cm in rested flat on the liquid surface. What slowly raised, it is found that the pull required is 0.03 N more before the film breaks than after. Find the surface tension of the liquid.

Answer 1

The surface tension of the liquid is approximately 0.014 N/m.

Step-by-step explanation:

To find the surface tension of the liquid, we can use the equation:

Surface Tension = (Pull before breaking - Pull after breaking) / (2πr)

Given that the radius of the ring is 3 cm and the pull required is 0.03 N more before the film breaks than after, we can substitute these values into the equation to calculate the surface tension.

Surface Tension = (0.03 N) / (2π * 0.03 m)

Simplifying this expression, the surface tension of the liquid is approximately 0.014 N/m.