A 40-liter tank full of water at 15 °C is to be heated to 50 °C by means of a 1-cm-OD copper steam coil having 10 turns of 30 cm diameter. The steam is at atmospheric pressure and its thermal resistance is negligibly small. Neglecting the heat losses from the tank, estimate the heating time required. (Hint: Assume the coil as a horizontal cylinder.)

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