8. Problem 2-33 (modified), Davis and Cornwell, Introduction to Environmental Engineering, 6th Ed.: The discharge pipe from a sump pump in the dry well of a sewage lift station did not drain properly, and the water at the discharge end of the pipe froze. A hole has been drilled into the ice, and a 250-W electric heater has been inserted in the hole to melt the ice. Assume all the heat goes into melting the ice. a. Is the system an open system or a closed system? b. Construct an energy balance for the system. C. If the discharge pipe contains 3.75 kg of ice, how long will it take to melt the ice?

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