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The sun transfers enegry to the earth by radiation at a rate of approximately 1.00kW per square meter of surface. If this energy could be collected and converted to electrical energy with 25% efficiency how large an area would be required to collect the electrical energy used by the United States? 1.0*10^19 Joules per year. If the solar collectors were arranged in a square array, what would be the length of its sides in kilometers and in miles?

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