# Homework Help: Approximate Values of Kinetic Energy and Potential Energy

1. Nov 4, 2015

### Wakko

1. The problem statement, all variables and given/known data
https://s2.lite.msu.edu/res/msu/perl_author/MI3/CH7/IMAGES/MI3_7P32.png
The figure shows a potential energy curve for the interaction of two neutral atoms. The two-atom system is in a vibrational state (i.e., a total energy state) indicated by the heavy solid horizontal line.
At r=r1, what are the approximate values of the kinetic energy K, the potential U, and the quantity K+U?

2. Relevant equations
Vibrational State = K + U

3. The attempt at a solution
I'm pretty sure that U = -1.2 (dotted line)
And the Vibrational State (bold line) or K + U = -0.4
Which I'd assume means that K = 0.8 but this is incorrect. I've looked at this inside out and cannot figure out what's wrong.

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2. Nov 5, 2015

### haruspex

Looks right to me.

3. Nov 5, 2015

### Wakko

I see what my mistake was. I was putting my answer in J but they wanted it in eV.