Mi aiutate in questo esercizio di fisica ,numero 8 ,mi sto preparando per la prossima verifica

Numero 7

Numero 8

(secondo i miei calcoli nessuno dei valori indicati è corretto)

Number 9

The first law of thermodynamics 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. In mathematical terms, it is expressed as:

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.

When a solid melts at constant pressure, heat is added to the system (Q > 0) to break the intermolecular bonds that hold the solid together. This heat is known as the latent heat of fusion. Since the volume of the resulting liquid does not differ much from the volume of the solid, the work done by the system (W) is relatively small because W = PΔV, and ΔV is small.

Therefore, the heat added to the system (Q) is primarily used to increase the internal energy of the system (ΔU). This means that the internal energy of the liquid is greater than the internal energy of the solid.

So, the correct answer is:

A) greater than the internal energy of the solid.

Numero 9

Quando un solido si scioglie a pressione costante, il volume del liquido risultante non differisce molto dal volume del solido. Secondo la prima legge della termodinamica, come si colloca l'energia interna del liquido rispetto all'energia interna del solido? L'energia interna del liquido è:

A) maggiore dell'energia interna del solido;

B) uguale all'energia interna del solido;

C) minore dell'energia interna del solido.