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How long would two handfuls of coal (approximately 3 cups) keep an 9.5 W LED bulb...

How long would two handfuls of coal (approximately 3 cups) keep an 9.5 W LED bulb burning? Assume a density of 1500kg/m3, a high effeciency coal power plant, and a caloric value of 10,000 BTU/lb. Give answer to the closest hour.

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