Homework 7 Solution

Homework 7 Solution - Version PREVIEW – Homework 7 –...

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Unformatted text preview: 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. ◦ 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.

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Homework 7 Solution - Version PREVIEW – Homework 7 –...

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