Задача id12911

In a cylinder under a weightless piston there is gas under pressure P equal to external pressure and with temperature T. The piston is held by an elastic spring (see Fig. 78). How many times must the temperature of the gas be increased so that its volume increases by one and a half times? If the gas is completely pumped out from under the piston, the piston is in equilibrium at the bottom of the cylinder.

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