The potential energy of a diatomic molecule (a two-atom system like h2 or o2) is given by the lennard-jones potential upper u equals startfraction upper a over r superscript 12 endfraction minus startfraction upper b over r superscript 6 endfraction comma where r is the separation of the two atoms of the molecule and a and b are positive constants. this potential energy is associated with the force that binds the two atoms together. (a) find the equilibrium separation - that is, the distance between the atoms at which the force on each atom is zero. (b) what is the second derivative of the potential at the equilibrium position?