hw23 - khounvivongsy(sk27799 Homework 23 Weathers(17104...

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khounvivongsy (sk27799) – Homework 23 – Weathers – (17104) 1 This print-out should have 9 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points At what ±ahrenheit temperature are the Kelvin and ±ahrenheit temperatures numeri- cally equal? Correct answer: 574 . 65 ±. Explanation: Basic Concepts: T F = 9 5 T C + 32 T C = T - 273 . 15 Solution: Let x = T F = T T C = 5 9 ( x - 32) and T C = x - 273 . 15 , so 5 9 ( x - 32) = x - 273 . 15 - 4 9 x = 5 9 (32) - 273 . 15 x = - 9 4 p 5 9 (32) - 273 . 15 P = 574 . 65 ± and 574 . 65 ± = 574 . 65 K 002 (part 1 oF 2) 10.0 points A constant-volume gas thermometer is cal- ibrated in dry ice (which is carbon dioxide in the solid state and has a temperature oF - 80 C) and in boiling ethyl alcohol (78 C). The two pressures are 0 . 6 atm and 1 . 686 atm. What value oF absolute zero does the cali- bration yield? Correct answer: - 167 . 293 C. Explanation: Let : p 1 = 0 . 6 atm , p 2 = 1 . 686 atm , t 1 = - 80 C , and t 2 = 78 C . Since we have a linear relationship P = A + B t between the pressure and the temperature, we obtain the system p 1 = A + B t 1 (1) p 2 = A + B t 2 (2) p 1 t 2 = A t 2 + B t 1 t 2 - p 2 t 1 = - A t 1 - B t 2 t 1 p 1 t 2 - p 2 t 1 = A ( t 2 - t 1 ) A = p 1 t 2 - p 2 t 1 t 2 - t 1 = (0 . 6 atm)(78 C) - (1 . 686 atm)( - 80 C) 78 C - ( - 80 C)

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hw23 - khounvivongsy(sk27799 Homework 23 Weathers(17104...

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