Surface Energy

A big drop of radius R is formed by coalescing 1000 small droplets of water. What will be the change in surface eneryg ? What will be the ratio between the total surface energy of the droplets and surface energy of the big drop ?

Number of droplets (n) are combined isothermally to form a big drop the ratio of initial and final surface energies of the system is

For a satellite orbiting very close to earth's surface, total energy is