Homework_22

Homework_22 - Nguyen Thanh – Homework 22 – Due 7:00 pm...

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Unformatted text preview: Nguyen, Thanh – Homework 22 – Due: Nov 30 2007, 7:00 pm – Inst: D Weathers 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points A car tire gauge is used to fill a tire to a gauge pressure of 42 . 5 lb / in 2 on a cold morning when the temperature is- 34 ◦ C. Atmospheric pressure is 14 . 7 lb / in 2 and 0 ◦ C = 273 K. What would the tire gauge read when the tire has been heated up to 35 . 5 ◦ C? Correct answer: 59 . 1335 lb / in 2 . Explanation: Given : P atm = 1 atm = 14 . 7 lb / in 2 , P 1 g = 42 . 5 lb / in 2 , T 1 =- 34 ◦ C = 239 K , and T 2 = 35 . 5 ◦ C = 308 . 5 K . Since the rubber is not expanding, the volume stays fixed. From the ideal gas law P V = n R T and P 1 = P 1 g + P atm = 42 . 5 lb / in 2 + 14 . 7 lb / in 2 = 57 . 2 lb / in 2 , so P 1 V T 1 = P 2 V T 2 P 2 = P 1 T 2 T 1 P 2 g + P atm = P 1 T 2 T 1 P 2 g = P 1 T 2 T 1- P atm = (57 . 2 lb / in 2 )(308 . 5 K) 239 K- 14 . 7 lb / in 2 = 59 . 1335 lb / in 2 . keywords: 002 (part 1 of 1) 10 points At 14 m below the surface of the sea (den- sity of 693 kg / m 3 ), where the temperature is 7 ◦ C, a diver exhales an air bubble having a volume of 1 . 2 cm 3 . The acceleration of gravity is 9 . 8 m / s 2 and the atmospheric pressure is 102000 Pa. If the surface temperature of the sea is 22 ◦ C, what is the volume of the bubble immediately before it breaks the surface? Correct answer: 2 . 44279 cm 3 . Explanation: Given : L = 14 m , ρ = 693 kg / m 3 , T 1 = 7 ◦ C = 280 K , V 1 = 1 . 2 cm 3 , and T 2 = 22 ◦ C = 295 K ....
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Homework_22 - Nguyen Thanh – Homework 22 – Due 7:00 pm...

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