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Please answer in as much detail as possible. 4. (25pt) A cold wave air drops the atmospheric temperature to -20C for 24h. If the ground

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Please answer in as much detail as possible.

4. (25pt) A cold wave air drops the atmospheric temperature to -20C for 24h. If the ground was initially at 10C, how deep the water pipeline have to be buried to avoid freezing? (thermal diffusivity of soil is 0.0011 m/h) 1) Draw the temperature profile under ground. 2) Calculate the distance in m

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