Julgue os itens a seguir, relativos a um sistema termicamente isolado constituído por dois corpos, A e B.
I Se os corpos A e B estão em equilíbrio térmico, conclui-se que A e B não trocam energia térmica entre si.
II Se os corpos A e B estão em equilíbrio térmico, conclui-se que A e B não trocam calor entre si.
III Se a temperatura de A é maior que a de B, então A tem maior energia térmica que B.
IV Independentemente das temperaturas de A e B, o corpo de maior massa tem mais energia térmica que o outro.
Assinale a opção correta.
- A) Apenas o item I está certo.
- B) Apenas o item II está certo.
- C) Apenas os itens I e III estão certos.
- D) Apenas os itens II e III estão certos.
- E) Todos os itens estão certos.
Resposta:
Answer: B) Only item II is correct.
Let's analyze each item:
I) If bodies A and B are in thermal equilibrium, each one does not exchange thermal energy with the other. This item is incorrect because when two bodies are in thermal equilibrium, they do exchange thermal energy, but the net energy transfer is zero, meaning that the energy gained by one body is equal to the energy lost by the other.
II) If bodies A and B are in thermal equilibrium, each one does not exchange heat with the other. This item is correct because when two bodies are in thermal equilibrium, there is no net heat transfer between them, meaning that the heat gained by one body is equal to the heat lost by the other.
III) If the temperature of A is greater than that of B, then A has more thermal energy than B. This item is incorrect because the thermal energy of a body is not directly related to its temperature. Thermal energy is a function of the internal energy of a system, which depends on the temperature, but also on other factors such as the specific heat capacity of the material.
IV) Regardless of the temperatures of A and B, the body with greater mass has more thermal energy. This item is also incorrect because the thermal energy of a body is not directly related to its mass. As mentioned earlier, thermal energy depends on the internal energy of a system, which is a function of the temperature, specific heat capacity, and other factors.
Therefore, the correct answer is B) Only item II is correct.
Deixe um comentário