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Homework Statement
A system is contained within the walls of a box and a movable piston. An object weighing W is placed on the piston. If you regard the gas and the piston as an isolated system, use the microcanonical ensemble to deduce the equation of state for p (pressure). Take a look at the picture.
Homework Equations
[tex]\mathcal{H}=\frac{1}{2m}\sum p_i^2 + Wx[/tex]
[tex]\Omega=V^{n}\int_{\mathcal{H} <E}dx d^{3N}p[/tex]
[tex]S=klog\Omega[/tex]
[tex]p/V=\frac{\partial S}{\partial V}[/tex]
The Attempt at a Solution
The only thing I need to solve this problem is to write down the hamiltonian of this system. I'd like to know if the expression that I have written is correct; in that case, I don't know how to evaluate the integral for the number of microstates.
thanks!
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