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What is the luminosity of a star having 2 times the radius of the Sun and a surface temperature of 9000 K?
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Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.
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Considering only the earth's rotation, determine how much later the asteroid would have had to arrive to put the explosion above helsinki at longitude 25˚ e? this would have obliterated the city.
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What is the luminosity of a star having 2 times the radius of the Sun and a surface temperature of 9...
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