Question

3. Если в некотором процессе телу сообщено 900 Дж теплоты, а тело при этом совершил работу 500 Дж, то как изменилась внутренняя энергия тела?

Answer 1

ΔU=Q-A=900-500=400 Дж
Увеличилась на 400 Дж
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Answer 2

Calculating Change in Internal Energy

To calculate the change in internal energy of the body, 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.

Given: - Heat added to the body, Q = 900 J - Work done by the body, W = 500 J

Using the first law of thermodynamics: Change in internal energy, ΔU = Q - W

Substitute the given values: ΔU = 900 J - 500 J ΔU = 400 J

Therefore, the change in the internal energy of the body is 400 J.