Question

Определите изменение внутренней энергии газа, если газ совершает работу в 10 Дж и при этом он теряет 20 Дж теплоты.

Answer 1

Внутренняя энергия газов уменьшается на 30Джоулей

Answer 2

Calculation of Change in Internal Energy

To determine the change in internal energy of the gas, we need to consider the work done by the gas and the heat lost by the gas.

The work done by the gas is given as 10 J, and the heat lost by the gas is given as 20 J.

According to the first law of thermodynamics, 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

where ΔU is the change in internal energy, Q is the heat added to the system, and W is the work done by the system.

In this case, the gas loses heat (Q = -20 J) and does work (W = 10 J). Substituting these values into the equation, we can calculate the change in internal energy:

ΔU = -20 J - 10 J = -30 J

Therefore, the change in internal energy of the gas is -30 J.

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