Question

Внутренняя энергия идеального газа 800 Дж. после того как газ во время адиабатного росширения совершил работу, его внутренняя энергия стала 300 Дж. Какую работу совершил газ?

Answer 1

При адиабатном расширении работа равна измнению внутренней энергии,т.е

A=U2-U1=300-800=-500 Дж

Answer 2

Calculation of Work Done by the Gas

To calculate the work done by the gas during the adiabatic expansion, we can use the first law of thermodynamics, which states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system:

ΔU = Q - W

In this case, the internal energy of the gas decreases from 800 J to 300 J. Since the gas is expanding adiabatically, there is no heat transfer (Q = 0). Therefore, the equation simplifies to:

ΔU = -W

Substituting the values, we have:

300 J = -W

Solving for W, we find that the work done by the gas is -300 J.

Note: The negative sign indicates that work is done on the gas, rather than by the gas.