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Unformatted text preview: Answer, Key – Homework 5 – David McIntyre 1 This printout should have 8 questions, check that it is complete. Multiplechoice questions may continue on the next column or page: find all choices before making your selection. The due time is Central time. Chapter 19 problems. Assume gases obey the ideal gas law where needed. 001 (part 1 of 2) 0 points On a day when the temperature reaches 50 . 5239 ◦ F, what is the temperature in de grees Celsius? Correct answer: 10 . 2911 ◦ C. Explanation: Given : T F = 50 . 5239 ◦ F . From the relationship T F = 9 5 T C + 32 T C = 5 9 ( T F 32) = 5 9 (50 . 5239 ◦ F 32) = 10 . 2911 ◦ C . 002 (part 2 of 2) 0 points What is the temperature in Kelvin? Correct answer: 283 . 291 K. Explanation: From the equation T C = T K 273 T K = T C + 273 = 283 . 291 K . 003 (part 1 of 2) 5 points At 17 ◦ C, an aluminum ring has an inner di ameter of 4 cm and a brass rod has a diameter of 4 . 07 cm. If the temperature coefficient of expansion for brass is α b = 1 . 9 × 10 5 ( ◦ C) 1 and the temperature coefficient of expansion for alu minum is α a = 2 . 4 × 10 5 ( ◦ C) 1 , to what temperature must the ring be heated so that it will just slip over the rod?...
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 Spring '10
 PHU
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