# Potential Energy Function Given E sub-t

1. Nov 11, 2008

### JWDavid

1. The problem statement, all variables and given/known data
two atoms - larger (M) at rest smaller (m) at a straight line distance r where m < < M. Figure shows U(r) for various positions of the lighter atom.<p>
1. . \
. . . | E1 --------<br>
0 - . \<br>
. . . . \ . . . . . . . ____<br>
-1. . . . \ E2--_/----<br>
. . . . . . \_ _/<br>
--.1 -- .2 --- .3 <p>
For E1 = 1.0 x 10-19J and r = 0.30 (crosses E2 line) find the potential energy, the kenetic energy, and the force (magnitude and direction) acting on the atom.<p>
U(r) is verticle at 10-19J<p>
R in nm is horizontal

2. Relevant equations
F = -dU/Dr<p>
KE = mV2/2<p>

3. The attempt at a solution
There were two other questions with this to describe the motion at ET >0 and <0, but I'm pretty sure I got them.
Also I'm pretty sure the force (direction) is towards the atom at rest, but I'm not sure what to do to get KE, and should I estimate the value of the potential energy from my graph which is better, or estimate the slope. I just need a nudge in the right direction to get going on this.<p>

2. Nov 12, 2008

### JWDavid

still need help on this one

3. Nov 13, 2008

### JWDavid

Is NO ONE able to provide help with this?!?