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Unformatted text preview: Version PREVIEW – Homework 7 – Savrasov – (39825) 1 This printout should have 10 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. Celsius vs Fahrenheit 001 10.0 points The coldest temperature possible is 273 de grees Celsius, which is called absolute zero. What is this temperature in degrees Fahrenheit? 1. +491 . 4 ◦ F 2. 523 . 4 ◦ F 3. 459 . 4 ◦ F correct 4. +459 . 4 ◦ F 5. 491 . 4 ◦ F 6. 32 ◦ F 7. +523 . 4 ◦ F 8. 32 ◦ F 9. ◦ F 10. 119 . 667 ◦ F Explanation: Let : T C = 273 ◦ C . T F = 9 5 T C + 32 = 9 5 ( 273 ◦ C) + 32 = 459 . 4 ◦ F . Pendulum Changes Length 002 10.0 points A clock has a 1 m bronze pendulum which is accurate at a temperature of 23 ◦ C. g m 1 m a r a t a φ θ What is the change in the length of the pendulum when the temperature reaches 43 . 7422 ◦ C? (The linear expansion coefficient of bronze is 1 . 9 × 10 − 7 ( ◦ C) − 1 .) Correct answer: 0 . 00394102 mm. Explanation: Given : L 1 = 1 m , T 1 = 23 ◦ C , T 2 = 43 . 7422 ◦ C , and α = 1 . 9 × 10 − 7 ( ◦ C) − 1 . We have this formula to calculate the expan sion Δ L = αL 1 Δ T = αL 1 ( T 2 T 1 ) = bracketleftbig 1 . 9 × 10 − 7 ( ◦ C) − 1 bracketrightbig (1 m) (20 . 7422 ◦ C) ×...
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This note was uploaded on 01/10/2010 for the course PHY na taught by Professor Richardscalettar during the Fall '09 term at UC Davis.
 Fall '09
 RichardScalettar
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