Задача id9594

In a thermally insulated tall cylindrical vessel at a distance h from the bottom, a piston of mass m hangs on a thread. There are v moles of ideal gas under the piston. The pressure under the piston at the initial moment is equal to the external pressure, the gas temperature is T1. The gas is heated by the coil. What amount of heat must be supplied to the gas so that the piston rises to a height of 2h from the bottom? There is no friction. Internal energy of a mole of gas U = ST, universal gas constant R, gravitational acceleration g.

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