Question

Внутренняя энергия системы тел была равна U Q = 500 Дж. Система совершила рабо- ту 200 Дж, а затем над ней совершили работу 1 кДж. Запишите выражение для изменения внутренней энергии и определите конечную внутреннюю энергию UK системы.

Answer 1

U₁ = 500 Дж
A₁ = - 200 Дж
А₂ = 1 кДж = 1000 Дж
U₂ - ?
ΔU = U₂ - U₁ - ?
U₂ = U₁ + A₁ + A₂ = 500 Дж - 200 Дж + 1000 Дж = 1300 Дж
ΔU = 1300 Дж - 500 Дж = 800 Дж

Answer 2

Calculation of Change in Internal Energy and Final Internal Energy

To calculate the change in internal energy and the final internal energy of the system, we need to consider the initial internal energy, the work done on the system, and the heat added to the system.

Given: - Initial internal energy (U) = 500 J - Work done on the system (W) = 200 J - Work done on the system (W) = 1 kJ = 1000 J

The change in internal energy (ΔU) can be calculated using the formula:

ΔU = Q - W

where Q is the heat added to the system and W is the work done on the system.

Substituting the given values:

ΔU = 500 J - 200 J = 300 J

The final internal energy (Uf) can be calculated by adding the change in internal energy to the initial internal energy:

Uf = U + ΔU

Substituting the values:

Uf = 500 J + 300 J = 800 J

Therefore, the change in internal energy is 300 J and the final internal energy of the system is 800 J.

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