Задача id10436

In a vertical thermally insulated cylinder under the piston there is a certain amount of helium at a temperature of 240 K. A load with a mass equal to half the mass of the piston rests on the piston. The load is instantly removed and the system is waited until it reaches equilibrium. What will be the temperature (in Kelvin) of the gas? There is no gas above the piston.

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