For a length segment delta x = 1 cm along the string, what is the total energy of oscillation? Answer in units of J.

Comments:

First I tried [tex]E_\lambda = U_\lambda + K_\lambda = \frac{1}{2} \mu \omega^2 A^2 \lambda[/tex] but that was wrong so then I changed the lamda to delta x, and that was wrong as well. How do we compute the total energy of a small line segment? thanks.