Physics - Heat & Thermo Question with Solution | TestHub

$\Delta {\text{U}}_{\text{CA}}={\text{nc}}_{\text{v}}\left({\text{T}}_{\text{A}}-{\text{T}}_{\text{C}}\right)=1\times \frac{5}{2}\text{R}\left(-200\right)=-500\text{R}$

$\Delta {\text{U}}_{\text{AB}}={\text{nc}}_{\text{v}}\left({\text{T}}_{\text{B}}-{\text{T}}_{\text{A}}\right)=1\times \frac{5}{2}\text{R}\times 400=+1000\text{R}$

$\Delta {\text{U}}_{\text{BC}}={\text{nc}}_{\text{v}}\left({\text{T}}_{\text{C}}-{\text{T}}_{\text{B}}\right)=1\times \frac{5}{2}\text{R}\left(-200\right)=-500\text{R}$