PHYS-1100 Spring 2009 Final Exam Answer Key

PHYS-1100 Spring 2009 Final Exam Answer Key - Physics 1100,...

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Physics 1100, Spring of 2009, Final Examination, Emphasis: Chapters 1 through 7 Name_____________________________________________ TURN OFF AND PUT AWAY ALL CELL PHONES, PAGERS, iPods, MP3s, ETC . On the provided Scantron® form, using #2 pencil, write, and then bubble in, your name - last name first . DO NOT write or bubble in your SS number or LSU ID number . Examine your paper carefully to be sure it is complete and readable. There should be 30 problems/questions, each counting 6.6667 points, totaling 200.001 points. You may write on the test paper, using the front or back for scratch work that will not be checked or graded. Clearly mark your answer selections on the Scantron® form provided. You will have about 120 minutes to complete this examination. Turn in your Scantron® and your exam paper (be sure to write your name on it) at the completion of the exam. You may review your exam paper with your instructor at a later time, and receive a copy of it if you wish. Facts that may (or may not) be useful: sea-level gravitational acceleration g = 9.80 m/s 2 Earth mass M E = 5.98 x 10 24 kg Earth radius R E = 6.37 x 10 6 m speed of light c = 3.00 x 10 8 m/s Avogadro's Number N A = 6.02 x 10 23 things per mole circumference of a circle 2 π R density of air 1.2 kg/m 3 area enclosed by a circle π R 2 density of pure water 1000 kg/m 3 volume of a sphere: (4/3) π R 3 density of salt water 1025 kg/m 3 surface area of a sphere 4 π R 2 density of aluminum 2700 kg/m 3 density of copper 8960 kg/m 3 density of gold 19300 kg/m 3 Compass bearings: 270 180 90 0
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Questions from Chapter 6 and 7 material not included on previous exams: 1. When a 500 gram spherical object, falling freely through air of density 1.2 kg/m 3 , finally reaches its terminal velocity, the magnitude of the drag force acting on it due to the air will be a) about 12 N * b) about 5 N c) about 1 N d) about 0 N e) none of the above are even approximately correct 2. Which of the following properties of an object DOES NOT influence its drag coefficient? a) its surface texture b) its shape * c) its mass d) all of the above (a-c) influence the drag coeffient e) none of the above (a-c) influence the drag coefficient 3. What is the approximate kinetic energy of a 36,000 kg (about 40 US tons) eighteen wheeler tractor trailer rig as it cruises down the I-12 at 31 m/s (about 70 mph)? * a) 17 MJ (mega joules) b) 5.6 MJ c) 35 MJ d) 21 MJ e) none of the above are even approximately correct 4. Three forces act on a 15 kg object as it undergoes a straight-line displacement. The first force does 45 J of work, the second force does 80 J of work. As a result of the action of the three forces the object's kinetic energy increases from 100 J to 150 J. Approximately how much work did the third force do?
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This note was uploaded on 06/07/2011 for the course PHYS 1100 taught by Professor Giomanico during the Spring '08 term at LSU.

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PHYS-1100 Spring 2009 Final Exam Answer Key - Physics 1100,...

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