A circular lake 1.0 km in diameter is 18 m deep. Solar energy is incident on the lake at an average rate of 223 W/m. If the lake absorbs all this energy and does not exchange heat with its surroundings, how long (days) will it take to warm from 10°C to 34°C? The density of lake water is 1000 kg/m", and its specific heat is 4184 J/kg.K. -1.0 km m

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