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Unformatted text preview: Winter 2011 RED barcode here Physics 123 section 2 Exam 1 Colton 2-3669 Please write your CID here __________ No time limit. One 3 5 note card (handwritten, both sides). No books. Student calculators OK. Constants which you may or may not need: g = 9.8 m/s 2 G = 6.67 10-11 N m 2 /kg 2 k B = 1.381 10-23 J/K N A = 6.022 10 23 R = k B N A = 8.314 J/molK = 5.67 10-8 W/m 2 K 4 I = 10-12 W/m 2 c = 3 10 8 m/s m electron = 9.11 10-31 kg Density of water: 1000 kg/m 3 Density of air: 1.29 kg/m 3 (standard conditions) Density of aluminum: 2700 kg/m 3 Density of liquid nitrogen: 808 kg/m 3 Linear exp. coeff. of alum.: 24 10-6 / C Linear exp. coeff. of copper: 17 10-6 / C Linear exp. coeff. of steel: 11 10-6 / C Specific heat of water: 4186 J/kg C Specific heat of ice: 2090 J/kg C Specific heat of steam: 2010 J/kg C Specific heat of aluminum: 900 J/kg C Specific heat of copper: 387 J/kg C Molar mass of O 2 : 32.00 g/mol Molar mass of N 2 : 28.01g/mol Molar mass of aluminum: 26.98 g/mol Latent heat of melting (water): 3.33 10 5 J/kg Latent heat of boiling (water): 2.26 10 6 J/kg Latent heat of boiling (liquid nitrogen): 1.98 10 5 J/kg Thermal conduct. of alum.: 238 J/s m C Thermal conduct. of copper: 397 J/s m C Speed of sound in air: v sound 343 m/s Index of refraction of water: n water 1.33 Index of refraction of glass: n glass 1.5 Index of refraction of air: n air 1.0) Conversion factors which may or may not be helpful: 1 inch = 2.54 cm 1 m 3 = 1000 L 1 atm = 1.013 10 5 Pa = 14.7 psi 1 eV = 1.602 10-19 J 32 5 9 + = C F T T 273.15 K C T T = + Other equations which you may or may not need to know: 2 4 2 b b ac x a- - = Surface area of sphere = 2 4 r Volume of sphere = ( 29 3 4 3 r Instructions: Record your answers to the multiple choice questions (Problem 1 on the next page) on the bubble sheet. To receive full credit on the worked problems, please show all work and write neatly . In general, to maximize your partial credit on worked problems you get wrong its good to solve problems algebraically first, then plug in numbers (with units) to get the final answer. Draw pictures and/or diagrams to help you visualize what the problems is stating and asking, and so that your understanding of the problem will be clear to the grader. Unless otherwise instructed, give all numerical answers for the worked problems in SI units, to 3 or 4 significant digits. For answers that rely on intermediate results, remember to keep extra digits in the intermediate results, otherwise your final answer may be off. Be especially careful when subtracting two similar numbers....
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This document was uploaded on 02/29/2012.
- Winter '09