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Unformatted text preview: Physics 124 - Analytical Physics FINAL EXAM Tuesday, May. 11, 2010 SIGN HERE NOW: 1. The exam will last from 4:00 - 7:00 P.M. Use a #2 pencil to make entries on the answer sheet. Enter ID information items 2-5, now, on the answer sheet before the exam starts... 2. In the section labeled 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; you may ignore the section number. 5. Under CODE enter the exam code given above. 6. During the exam, you may use pencils, a calculator, and one 8.5 x 11 inch sheet (both sides) with formulas and notes. 7. There are 30 multiple-choice questions on the exam. For each 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. At the end of the exam, hand in the answer sheet and this SIGNED cover page. Retain the exam questions attached for future reference and study. 8. When you are asked to open the exam, make sure that your copy contains all 30 questions. 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. Please have your student ID ready to show to the proctor during the exam. 10. Possibly useful information : at the earths surface g = 9.8 m/s 2 , v sound in air 340 m/s, air 1.2 kg/m 3 , I solid disk = (1 / 2) mr 2 , and I = 1 10 12 W/m 2 . 1. A solid disk rolls down a 45 slope, starting from rest. What is its trans- lational speed when it has gone 5 m along the slope? a) < 2 m/s b) 2 4 m/s c) 4 6 m/s d) 6 8 m/s e) > 8 m/s 5 m 2. An object is stationary, in equilibrium, in a uniform gravitational field. Which of the following is true? a) The object must be symmetric it can be a circle, but not a wrench. b) It is possible for there to be three external forces acting on the object. c) Each force on the object must be balanced by a single equal force in the opposite direction. d) All forces must point at the center of mass so that there is no net torque on the object. e) The sum of the torques is zero because the sum of the forces is zero. (They are not independent conditions.) 3. A 2-m wire of negligible mass consists of two 1-m segments, one of steel (Youngs modulus = 2 10 11 Pa) and one of brass (Youngs modulus = 1 10 11 Pa). The cross sectional area of the brass segment is four times larger than that of the steel segment. When a weight W is hung from the ceiling by this wire, the steel segment stretches by 1 mm. Find the elongation of the brass segment....
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