Question

Газ при адиабатическом процессе совершил работу 200 МДж. Как изменилась его внутренняя энергия? Что произошло с газом: охладился или нагрелся?

Answer 1

Процесс адиабатный, значит Q = 0 => ΔU = - A => ΔU = -200 МДж, 
Поскольку работа была совершена газом, значит его внутренняя энергия уменьшилась на 200 МДж, значит процесс адиабатного сжатия, значит газ нагрелся.

Answer 2

Gas Work in Adiabatic Process and Change in Internal Energy

When a gas undergoes an adiabatic process and performs work, the change in its internal energy can be calculated using 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 on its surroundings.

The work done by the gas in an adiabatic process can be calculated using the formula: W = -ΔU Where: - W = work done by the gas - ΔU = change in internal energy

Given that the gas performed work of 200 MJ, we can calculate the change in its internal energy using the above formula. Since the work done is positive, the change in internal energy will be negative, indicating a decrease in internal energy.

Now, let's calculate the change in internal energy: ΔU = -W ΔU = -200 MJ

Therefore, the change in the gas's internal energy is -200 MJ, indicating a decrease in internal energy. This means that the gas has lost internal energy during the adiabatic process.