Physics - Heat & Thermo Question with Solution | TestHub

Slope is the temperature change per unit energy, so it is inversely proportional to the heat capacity.
$$\text{slope}=\frac{\Delta T}{\Delta Q}\propto \frac{1}{s}$$
Water has the highest specific heat, so portion C has the smallest slope. Ice (A) is next and steam (E) is the largest.
Using the graph values:
$$\text{A}=\frac{30}{62.7}\approx 0.48$$
$$\text{C}=\frac{90}{815-396}\approx 0.21$$
$$\text{E}=\frac{30}{3110-3070}=0.75$$
Order: C, A, E.