Determine the thickness of a sandy soil, if during the

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Determine the thickness of a sandy soil, if during the 3 hour through an area of 1 ha J. 511 passes the heat. The temperature at the surface of the soil 20 ° C, and a lower layer 7 ° C. Determine how many times the thermal conductivity of the process in sandy soil more intensively than in the air.

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Task 20684. Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
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