Avg potential energy of molecules in a reservoir

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Homework Statement



An insulated cylindrical reservoir of height H is suspended vertically in the field of gravitation. Find the average potential energy of the molecules in the reservoir.

Homework Equations



F = [tex]\frac{Gm_{1}m_{2}}{r^{2}}[/tex]

The Attempt at a Solution


To be honnest I have no clue what to do! Could you please give me a slight hint.

There is no change of pressure, volume or temperature. Another thing is that most of the molecules will be located close to the earths surface but due to their movement you will have some kind of distribution.
 
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