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Homework 7 Solution

# Homework 7 Solution - Version PREVIEW Homework 7...

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Version PREVIEW – Homework 7 – Savrasov – (39825) 1 This print-out should have 10 questions. Multiple-choice 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. 0 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 = α L 1 Δ T = α L 1 ( T 2 - T 1 ) = bracketleftbig 1 . 9 × 10 7 ( C) 1 bracketrightbig (1 m) (20 . 7422 C) × parenleftbigg 1000 mm 1m parenrightbigg = 0 . 00394102 mm .

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