27. Solving a chemistry problem

31. Calculate the adhesion force of a liquid nanoparticle to a flat surface of a solid material, knowing the Hamaker constant A of the two given phases, the particle radius r and the gap size h between the particle and the surface, indicated in the following table (for your problem number):

Problem N 31
A*1021, J 43
r, nm 15
h, nm 0.212