Physics - Heat & Thermo Question with Solution | TestHub

A horizontal cylinder of length $2l$ has a thin insulating piston dividing it into two parts, each holding $n=2$ mol of ideal monoatomic gas at $T=300$ K. The piston is joined to both end faces by undeformed springs of stiffness $k=2000$ N $m^{-1}$, with $l=0.1$ m. Heat $Q=20000$ J is slowly supplied to the right gas and the piston shifts by $x=\frac{l}{2}$. The left gas stays at $T$ through a thermostat. Find the heat given to the thermostat in joules (nearest integer).