This preview shows pages 1–3. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Gozick, Brandon Homework 22 Due: Dec 5 2006, 7:00 pm Inst: D Weathers 1 This printout should have 14 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 2) 10 points On a day when the temperature reaches 59 . 8424 F, what is the temperature in de grees Celsius? Correct answer: 15 . 468 C. Explanation: Given : T F = 59 . 8424 F . From the relationship T F = 9 5 T C + 32 T C = 5 9 ( T F 32) = 5 9 (59 . 8424 F 32) = 15 . 468 C . 002 (part 2 of 2) 10 points What is the temperature in Kelvin? Correct answer: 288 . 468 K. Explanation: From the equation T C = T K 273 T K = T C + 273 = 288 . 468 K . keywords: 003 (part 1 of 1) 10 points A square hole 4 . 2 cm along each side is cut in a sheet of copper. Calculate the change in the area of this hole if the temperature of the sheet is increased by 74 K. Correct answer: 0 . 0443822 cm 2 . Explanation: Given : L = 4 . 2 cm and T = 74 K . Each side of the hole expands linearly by L = L T . The area, therefore expands by A = ( L + L ) 2 A . Since L is much smaller than L we should keep only the linear term in L , so A = 2 L L = 2 A T = 2 1 . 7 10 5 ( C) 1 /( 17 . 64 cm 2 ) (74 K) = 0 . 0443822 cm 2 keywords: 004 (part 1 of 1) 10 points A steel rod 3 . 7 cm in diameter is heated so that its temperature increases by 86 C and then is fastened between two rigid supports. The rod is allowed to cool to its original tem perature. Assuming that Youngs modulus for the steel is 1 . 58 10 11 N / m 2 and that its av erage coefficient of linear expansion is 1 . 3 10 5 ( C) 1 , calculate the tension in the rod. Correct answer: 189 . 929 kN. Explanation: Given : d = 3 . 7 cm = 0 . 037 m , T = 86 C , Y = 1 . 58 10 11 N / m 2 , and = 1 . 3 10 5 ( C) 1 . The elongation of the rod from the change of the temperature is = T F A = Y = Y T F = A Y T = d 2 2 Y T = . 037 m 2 2 ( 1 . 58 10 11 N / m 2 ) (86 C) = 189 . 929 kN . Gozick, Brandon Homework 22 Due: Dec 5 2006, 7:00 pm Inst: D Weathers 2 keywords: 005 (part 1 of 2) 10 points...
View
Full
Document
 Fall '08
 Weathers
 mechanics, Work

Click to edit the document details