Krishna
0

Surface tension of  a liquid is measured as force acting per length


Surface tension T = \frac{force(F)}{area(A)}.....................(1)

You can calculate force  F = T * A  


Step 1: In the question they given

            NOTE: Radius = 1 cm

                  1 cm = 10^{-2}

                Surface tension of mercury = 460 * 10^{-3}

                  We have to calculate the energy


            FORMULA: Force F = T * [math] 4 \pi r^2 [n^(\frac{1}{3}) -1)][/math]


Step 2: Substitute the known values in the formula

    Force F = [math] 460 * 10^{-3} * 4 \pi (10^{-2})^2 [(10^6)^(\frac{1}{3}) -1)][/math]

              F = [math] 460 * 12..56 * 10^{-3} * 10^{-4} * [100 -1][/math]

              F = 46 * 10 *12.56 * 10^{-7} (99)

              F = 57,198.24 * 10^{-6}

              F = 0.057 joule