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Unformatted text preview: Physics 2101, First Exam, Spring 2006 January 24, 2006 Name : KEY Section: (Circle one) 1 (Rupnik, MWF 7:40am) 4 (Kirk, MWF 2:40pm) 2 (Rupnik, MWF 9:40am) 5 (Kirk, TTh 10:40am) 3 (Rupnik, MWF 11:40am) 6 (Gonz´ alez, TTh 1:40pm) • Please be sure to write your name and circle your section above. • For the 17-point problems, you must show all your work. Let us know what you were thinking when you solved the problem! Lonely right answers will not receive full credit, lonely wrong answers will receive no credit. • For the 8-point questions, no work needs to be shown (there is no partial credit). • Please carry units through your calculations when needed, lack of units will result in a loss of points. • You may use scientific or graphing calculators, but you must derive your answer and explain your work. • Feel free to detach, use and keep the formula sheet. No other reference material is allowed during the exam. • Be sure to get extra credit by answering the question below. • GOOD LUCK! EXTRA CREDIT (5 pts) : Did you take Physics 1100 during the fall semester of 2005? Yes No If you responded “yes”, then please circle your grade if you remember it. A B C D Did you place out of Physics 1100 during spring testing? Yes No Have you taken Physics 2101 at LSU before? Yes No If you responded “yes”, then how many times before have you taken Phys 2101? 1 Question 1 - 8 points The figure shows the velocity of a particle moving along an axis. Point 1 is at the highest point in the curve; point 4 is at the lowest point. (a) (2pts) What is the direction of travel at t=0? Forward Backward The particle is stopped The velocity is positive at t = 0, so the particle is moving forward. (b) (3 pts) At which of the four numbered points does the particle reverse its direction of travel? 1 2 3 4 The velocity is positive before t = t 3 , so the particle is moving forward before point 3; the velocity is negative after t = t 3 , so the particle is moving backwards after point 3. At t = t 3 , the velocity is zero and the particle reverses its direction of motion. (c) (3 pts) At which of the four numbered points is the magnitude of the acceleration largest? 1 2 3 4 The slope of v ( t ) has maximum magnitude (is steepest) at t = t 2 ; since the accelera- tion is the derivative of the velocity with respect to time, the acceleration will have maximum magnitude at t = t 2 (but notice that the acceleration is negative while the velocity is positive, so the particle is slowing down)....
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This note was uploaded on 05/20/2011 for the course PHYS 2101 taught by Professor Grouptest during the Spring '07 term at LSU.
- Spring '07