2007s_f - Physics 2101, Final Exam, Spring 2007 May 10,...

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Physics 2101, Final Exam, Spring 2007 May 10, 2007 Name : Section: (Circle one) 1 (Rupnik, MWF 7:40am) 2 (Giammanco, MWF 9:40am) 3 (Rupnik, MWF 11:40am) 4 (Rupnik, MWF 2:40pm) 5 (Giammanco, TTh 10:40am) 6 (Gonz´alez, TTh 1:40pm) Please be sure to write your name and circle your section above. For the 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 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. GOOD LUCK! 1
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Problem 1 - 13 points Two blocks of masses M and 2M are connected to a spring of constant k that has one end fixed, as shown in the figure. The horizontal surface and the pulley are frictionless, and the pulley has negligible mass. The blocks are released with the spring relaxed. (a) (3 pts) Write an expression for the work done by gravity on the M hanging block when it reaches the lowest position, a distance H below its initial position, where it momentarily stops. Your expression should be in terms of M, g, H and numerical constants. (b) (4 pts) Write an expression for the work done by the spring when the M block reaches the lowest position, using k, H and numerical constants. (c) (6 pts) Derive an expression for the maximum distance H the spring stretches after the blocks are released, in terms of M, g and k . 2
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Question 1 - 6 Points In the figure below, block 1 slides from rest along a frictionless ramp from height h and then collides with stationary block 2, sticking to it. After the collision, the blocks now stuck together, slide into a region with a coefficient of kinetic friction μ k , and come to a stop in distance d within that region. (a) (2 pts) Circle the quantity (or quantities) that are conserved in the fall of block 1
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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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2007s_f - Physics 2101, Final Exam, Spring 2007 May 10,...

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