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Physics Work,Power & Energy Level: High School

Potential Energy

The potential energy between two atoms in a particular molecule has the form U(x) = (3.1/x^8)-(5.3/x^4) where the units of x are length and the numbers 3.1 and 5.3 have appropriate units so that U(x) has units of energy. What is the equilibrium separation of the atoms (that is the distance at which the force between the atoms is zero) ?