Chapter 18, Problem 30P

A 0.400 kg simple is placed in a cooling apparatus that removes energy as heat at a constant rate. Figure 18-33 gives the temperature T of the sample versus time t; the horizontal scale is set by t_s = 80.0 min. The sample freezes during the energy removal. The specific head of the sample in its initial liquid phase is 3000 J/kg·K. What are (a) the sample’s heat of fusion and (b) its specific heat in the frozen phase?

Figure 18-33 Problem 30.