Question

Calculate the surface tension of a liquid whose weight is 0.1 N and the length of a wire that floats on the surface of the liquid is 20 cm. The density of the liquid is 1.2 g/cm³.

Answer 1

To calculate the surface tension of the liquid, we can use the formula for the force exerted by surface tension on the wire:F = 2 * L * Twhere F is the force exerted by surface tension, L is the length of the wire, and T is the surface tension of the liquid.The weight of the liquid  0.1 N  is balanced by the force exerted by surface tension, so we can write:0.1 N = 2 * 20 cm * TNow, we can solve for T:T =  0.1 N  /  2 * 20 cm T = 0.1 N / 40 cmT = 0.0025 N/cmThe surface tension of the liquid is 0.0025 N/cm.