124_s08_fin - Physics 124 Final May 13, 2008 Your name...

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Unformatted text preview: Physics 124 Final May 13, 2008 Your name sticker with exam code 1. The exam will last 3 hours, from 4 - 7 PM. Use a #2 pencil to make entries on the answer sheet. Enter the following id information now, before the exam starts. 2. In the section labelled NAME (Last, First, M.I.) enter your last name, then fill in the empty circle for a blank, then enter your first name, another blank, and finally your middle initial. 3. Under STUDENT # enter your 9-digit RUID Number. 4. Enter 124 under COURSE, and your section number under SEC. 5. Under CODE enter the exam code given above. 6. During the exam, you may use a calculator and are allowed two 8.5 x 11 inch sheets of paper with whatever you want written on them. 7. The exam consists of 30 multiple choice questions. For each multiple choice question mark only one answer on the answer sheet. There is no deduction of points for an incorrect answer, so even if you cannot work out the answer to a question, you should make an educated guess. 8. Before starting the exam, make sure that your copy contains all 30 ques- tions. Raise your hand if this is not the case, and a proctor will help you. Also raise your hand during the exam if you have a question. 9. A proctor will check your name sticker and your student ID sometime during the exam. Please have them ready. 10. You are not allowed to give help to any other student, ask for help from any- one but a proctor, or change your seat without permission from a proctor. Doing so will result in a zero score for the exam. 11. Hand in this cover sheet along with your answer sheet. 12. Please sign below to indicate that you have read and understood these in- structions. Useful physical constants : The gas constant R = 8.314 J/mol K, the Boltzmann constant k B = 1.38 10 23 J/K, Avogadros number is R/k B = 6.02 10 23 , 0 C = 273 K, the moment of inertia of a sphere about its center is I = 2 Mr 2 / 5, the speed of sound in air is 343 m/s, 1 atmosphere pressure = 10 5 Pa, the gravitational constant G = 6.67 10 11 m 3 /s 2 kg, at the earths surface g = 9.8 m/s 2 , and the volume of a sphere of radius r is 4 r 3 / 3. 1. A standing wave is described by the equation y = 0 . 030 m cos5 . x cos2 . t , with x in m and t in s. This corresponds to a superposition of two traveling waves of what speed? a) 2.5 m/s b) 0.4 m/s c) 0.06 m/s d) 0.12 m/s e) 0 m/s - standing waves are not moving 2. A string tied at both ends is oscillating in its second overtone (third har- monic) with a wave length of 0.66 m. How long is the string?...
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124_s08_fin - Physics 124 Final May 13, 2008 Your name...

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