2010s_2 - Physics 2101, Exam #2, Spring 2010 March 3 , 2010...

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Physics 2101, Exam #2, Spring 2010 March 3 , 2010 Name: ___________________________ ID#: ____________________________ Section: (Circle one) 1 (Rupnik, MWF 8:40 AM) 5 (Jin, TTh 12:10) 2 (Rupnik, MWF 10:40 AM) 6 (González, TTh 4:40) 3 (Zhang, MWF 12:40 PM) 7(Sprunger, TTh 1:40) 4 (Plummer, TTh 9:10) Please be sure to write (print) your name and circle your section above. Please turn OFF your cell phone and MP3 player! Feel free to detach, use, and keep the formula sheet. No other reference material is allowed during the exam. You may use either a scientific or a graphing calculator. Show all your work for the problems that are not multiple choice! There are a total of 10 problems (total points add to 100 pts) GOOD LUCK!
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1. ( Show all of your work ) The figure at the right shows a potential energy diagram U as a function of x for an object of mass 1 kg. (A) (5pts) At the point x =3m the object has a velocity of 2 m/sec. Find the mechanical energy E mech for this system and draw a line on the figure to represent the mechanical energy. (B) (5pts) What is the allowed range of the motion along x given the mechanical energy found above (hint: you can read this off of the graph)? (C) (10 pts) What is the force (magnitude and direction) acting on the object in each regions of the potential energy diagram in the allowed range of motion? Your answers should first describe the region ( x values) and then the magnitude and direction of the force.
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2. (5pts) A massless spring of spring constant k = 25.0 N/m hangs motionless from the ceiling. You carefully attach a mass to the end of the spring with a weight of 5 N without letting the spring stretch
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2010s_2 - Physics 2101, Exam #2, Spring 2010 March 3 , 2010...

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