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Unformatted text preview: aljabr (faa335) Hw26 Ross (89251) 1 This print-out should have 6 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 10.0 points Given: The specific heat of air is approxi- mately 1 kJ / kg C. Take the density of air to 1 . 25 kg / m 3 . The specific heat of water is 4 . 19 kJ / kg C and the density of water is 1000 kg / m 3 . The air temperature above the coastal areas is profoundly influenced by the large specific heat of water. One reason is that the heat released when 2 m 3 of water cools by 2 C will raise the temperature of an enormously larger volume of air by 3 C. Calculate this volume of air. Correct answer: 4469 . 33 m 3 . Explanation: Given : V w = 2 m 3 , c w = 4 . 19 kJ / kg C , w = 1000 kg / m 3 , c air = 1 kJ / kg C , air = 1 . 25 kg / m 3 , T w = 2 C , and T air = 3 C . w V w c w T w = air V air c air T air V air = w V w c w T w air c air T air = (1000 kg / m 3 )(2 m 3 ) 1 . 25 kg / m 3 (4 . 19 kJ / kg C) (2 C) (1 kJ / kg C) (3 C) = 4469...
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This note was uploaded on 01/27/2011 for the course PHYS 251 taught by Professor Gavrine during the Spring '10 term at Purdue University-West Lafayette.
- Spring '10