In the old days people thought that the sun might be a, Physics

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In the old days people thought that the sun might be a

In the old days, people thought that the Sun might be a burning briquette of coal. At the Earth, the intensity of the radiation of the Sun is about 1400 W/m2. Assume that the intensity is constant with time. The mass of the Sun is 2.0×1030 kg, and its distance from the Earth is 1.5×1011 m. The heat energy contained in coal is approximately 25 MJ/kg. How long would the Sun shine, if it really were a piece of burning coal?

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Physics: In the old days people thought that the sun might be a

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