Finding Force From Potential Energy

[Diff.Ed]

Homework Statement

The potential energy of two neutral molecules may be modelled using the Lennard Jones potential,
$$U(x)=U_0(\frac{\sigma^{12}}{x^{12}} - \frac{\sigma^6}{x^6})$$
where $U_0$ and $\sigma$ are positive constants and $x$ is the distance between the two molecules.

a) Find the force at an arbitrary point x ?

Homework Equations

conservative forces and potential energy

The Attempt at a Solution

$$F(x) = -\frac{dU}{dx}= U_0(12\frac{\sigma^{12}}{x^{13}} - 6\frac{\sigma^6}{x^7})$$

Is my answer correct ?

 

[gneill]

Looks fine.