P123_F08_FE - Physics 123 Analytical Physics FINAL EXAM...

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Physics 123 - Analytical Physics FINAL EXAM Tuesday, December 16, 2008 Professor R.A. Bartynski Your name sticker with exam code. SIGN HERE: 1. The exam will last from 4:00 - 7:00 p.m. 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 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 123 under COURSE, and your section number (see label above) under SEC. 5. Under CODE enter the exam code given above. 6. During the exam, you may use pencils, a calculator, and two 8.5 x 11 inch sheets 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 the cover page. Retain this question paper 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 SIGN the cover sheet under your name sticker and have your student ID ready to show to the proctor during the exam. 10. If needed, the acceleration due to gravity on earth may be take as g = 9.81 m/s 2 . 1
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1. Why do raindrops fall with constant speed during the later stages of their descent? a) The gravitational force is the same for all drops. b) The force from air resistance just balances the force of gravity. c) The drops all fall from the same height. d) The force of gravity is negligible for objects as small as raindrops. e) Gravity can not increase the speed of a falling object to more than 9.8 m/s. 2. A 100-kg stoplight hangs from the midpoint of a cable strung between two poles. Each half of the cable makes an angle of 3 with the horizontal.. The tension in each half of the cable is a) depends on the distance between the poles b) 1900 N c) 950 N d) 18.6 kN e) 9.4 kN 3. A small car has a mass of 1000 kg, and an SUV has a mass of 2000 kg. They both have the same coefficient of kinetic friction with the road when sliding while braking. Starting at the same initial velocity, both vehicles brake suddenly, eventually they come to rest when sliding stops. Which statement is true?
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