Exam1_solutions - Physics 2101 First Exam Spring 2008...

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Physics 2101, First Exam, Spring 2008 SOLUTION KEY January 22, 2008 Please turn OFF your cell phone and MP3 player! Write your name and section number in the front of the scantron form. Bubble in your name on the back of the scantron form, LAST name first . DO NOT bubble in your SSN or LSU ID number. Make sure to mark your answers in the scantron form with a #2 black pencil. You can mark your answers in this exam form too, and keep it for reference. We will show the key at the end of the exam, so you can know the grade you will receive. Feel free to detach, use and keep the formula sheet. No other reference material is allowed during the exam. You may use scientific or graphing calculators. This is a diagnostic exam on material whose knowledge is required for this class, from chapters 1-6 in the textbook, and covered in Phys 1100 (although you may have tested out of Phys 1100). We will make heavy use in the rest of the course of the concepts in these introductory chapters. We will review this material the first week of classes, but if you don’t know the material already, you will not be able to learn it in a week, or do well in the class. The test is expected to reveal any weaknesses that you may have in your knowledge of the material, so make sure you act on the test results! We will announce the answers at the end of the test and link the solutions in the announcements in the course page: http://www.phys.lsu.edu/classes/spring2008/phys2101/ You should know how you did immediately after finishing the test. If you do not do at least reasonably well (60% or better), you should seriously consider dropping the course. The deadline for add a course (Phys 1100, for example) and for dropping without a W is midnight Tuesday Jan 22 (tonight!), so you have a few hours after the exam. 1
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1. During a short interval of time the speed v in m / s of an automobile is given by v = at 2 + bt 3 , where the time t is in seconds. The units of the constants a and b are respectively: (a) m · s 2 ; m · s 4 (b) s 3 / m; s 4 / m (c) m / s 2 ; m / s 3 (d) m / s 3 ; m / s 4 (e) m / s 4 ; m / s 5 Since velocity needs to have units of m/s, each of the terms at 2 and bt 3 needs to also have units of m/s, with time in seconds. 2. Two automobiles are 150 kilometers apart and traveling toward each other. One automobile is moving at 60 km/h and the other is moving at 40 km/h. In how many hours will they meet? (a) 2.5 hrs (b) 2.0 hrs (c) 1.75 hrs (d) 1.5 hrs (e) 1.25 hrs The velocity of the cars with respect to one another is 100 km/h; they are 150 km apart, so they will meet in 1.5 hrs. 3. The plots below show the position versus time for the motion of five different particles. Which particle is speeding up towards the origin of the x-axis?
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Exam1_solutions - Physics 2101 First Exam Spring 2008...

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