Task 50358.
Assuming that the atmosphere absorbs 10% of the radiant energy sent by the Sun, found the radiation power N, obtained from the sun, level ground area S = 0,5 hectares. Sun´s height above the horizon 30 °. Radiation of the Sun considered close to the radiation from a blackbody.
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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