2008s_f - Physics 2101, Final Exam, Spring 2008 May 8, 2008...

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Unformatted text preview: Physics 2101, Final Exam, Spring 2008 May 8, 2008 Name: Section: (Circle one) 1 (Rupnik, MWF 8:40am) 2 (Giammanco, MWF 10:40am) 3 (Gonzalez, MWF 12:40pm) 4 (Rupnik, MWF 2:40pm) 5 (Rupnik, TTh 9:10am) 6 (Sheehy, TTh 12:10pm) Please be sure to write your name and circle your section above. For the 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. For the problems, explain your reasoning as much as possible. Partial credit will be awarded, and correct answers with no work shown will not receive full credit. GOOD LUCK! 1 Question 1 (7 pts): The figure shows a plot of potential energy versus position U ( x ) of a conservative force F ( x ). A particle is at point x = b at t = 0, moving towards the left. It temporarily stops when it reaches x = a , and then it begins moving towards the right. (a) (3pts) What is the maximum kinetic energy that the particle will have ? U ( a ) U ( b ) U ( a )- U ( b ) U ( c ) U ( d ) (b) (2pts) Will the particle ever reach point d ? Yes No We need more information to decide. (c) (2pts) What are the turning points for this particles motion? a, b, c a, c a, c, f b, d, e 2 Question 2 (6pts): In the figure shown, block 2, with mass M , is at rest on a frictionless surface and touching the end of a relaxed spring of constant k . The other end of the spring is fixed to a wall. Block 1, of mass 2 M , traveling at speed v 1 , collides with block 2, and the two blocks stick together, beginning an oscillation with frequency . The collision happens in a very short time. (a) (2pts) What is the velocity of the two blocks together just after the collision? v 1 2 v 1 2 v 1 / 3 v 1 / 3 v 1 / 2 (b) (2pts) If the collision happens at t = 0, and the origin of the x axis is at the position of block 2 before the collision, with the positive direction to the right, which of these expressions describe the...
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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.

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2008s_f - Physics 2101, Final Exam, Spring 2008 May 8, 2008...

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