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Unformatted text preview: meters deep, composed of 50% ice and 50% air. Direct sunlight provides about 1000watts / m 2 to earths surface, but the snow might reect 90% of this energy. Estimate how many weeks the snow pack should last, if direct solar radiation is the only source of energy. (the latent heat for melting ice is 334 J/g ). Answer: The density of ice is 9 . 167 10 5 g / m 3 . So per square meter area there are 9 . 167 10 5 g / m 3 2m 3 50% = 9 . 167 10 5 g ice. It would take 9 . 167 10 5 g 334J / g / (1000Watts 10%) = 3061778s 35days 5weeks to melt. 4. Solve problem 4.8.1 of the class note. Answer: C = QW = T h T hT c Therefore W / (1kJ) = 40 / 313 . 15, W = 127 . 7J. 1...
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 Winter '08
 Vinals
 Work, Heat

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