Chapter 18, Problem 55GP

* In a hot water heater, water warms when electric potential energy is converted into thermal energy. (a) Determine the energy needed to warm 180 kg of water by $\text{10 °C}$. (b) If - $\text{10}\text{.0 C}$ of electric charge passes through $\text{a + 120-V}$ potential difference in the heating coils each second, determine the time needed to warm the water by $\text{10 °C}$.