일반물리학 1 — Temperature, Heat, and the First Law of Thermodynamics: Problem 7

7 When a system is taken from state $i$ to state $f$ along path $iaf$ in Fig. 18-25, $Q = 100 \text{ cal}$ and $W = 40 \text{ cal}$. Along path $ibf$, $Q = 72 \text{ cal}$. (a) What is $W$ along path $ibf$? (b) If $W = -26 \text{ cal}$ for the return path $fi$, what is $Q$ for this path? (c) If $E_{int,i} = 20 \text{ cal}$, what is $E_{int,f}$? If $E_{int,b} = 44 \text{ cal}$, what is $Q$ for (d) path $ib$ and (e) path $bf$?