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exam2_2007f_sol - PHYSTCS 221 Fall 2007 EXAM2 November...

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PHYSTCS 221 EXAM 2: November 14, Fall 2007 2007 8:00pm-10:00pm Name (printed): Recitation I nstructor: INSTRUCTIONS: Section # This exam contalns 25 multiple-choice questions plus 2 extra credit questions, each worth 3 points. Choose one answer only for each question. Choose the best answer to each question. Answer all questions. Allowed material:Before turning over this page, put away all materials except for pens, pencils, erasers, rulers and your calculator. There is a formula sheet attached at the end of the exam. Other copies of the formula sheet are not allowed. Galculator: In general, any calculator, including calculators that perform graphing, is permitted. Electronic devices that can storelarge amounts of text, data or equations (like laptops, palmtops, pocket computers, PDA or e-book readers) are NOT permitted. lf you are unsure whether or not your calculator is allowed for the exam, ask your TA. How to fill in the bubble sheet: Use a number 2 pencil. Do NOT use ink. lf you did not bring a pencil, ask for one. Writeand fill in the bubbles corresponding to: - Your last name, middle initial, and firstname. - * * Your lD number (the middle 9 diqits on vour ISU cardl * * - Special codes K to L are your recitation section. (Honors section, please enter 24). Always use two digits (e.9. 01, 09, 11, 13) Please turn over your bubbte sheet when you are not writing on it. lf you needto change any entry, you must completely erase your previous entry. Also, circle your answers on this exam. Before handing in your exam, be sure that your answers on your bubble sheet are what you intend them to be. You may also copy down your answers on a piece of paper to take with you and compare with the posted answers. You miy use the table at the end of the exam for this. When you are finished with the exam,place all exam materials, including the bubble sheet, and the exam itself, in your folder and return the folder to your recitation instruitor. No cell phone calls allowed. Either turn off your cell phone or leave it at home. Anyone answering a cell phonemust hand in theirwork;their exam is over. Besf of luck, Paul Canfield and paula Herrera
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28. Which of the following changes to an oscillating system will cause the smallest change in the system'speriod? A) For a spring / mass system, double thq mass. B) For a spring / mass system, double the spring constant. $For a simple pendulum (point mass on a string), double the length of the string. 'p)/For a simple pendulum (point mass on a string), double the mass. D All of the above changes affect the period in the same manner. 29. An insulating rod with charge Q is placed at distance d froman uncharged metal surface. The electrostatic force between therods is: A) Zero. B) Attractive it Q > 0, repulsive if e < A. A Attractiv e if Q ( 0, repulsive if Q > 0. (92Attractive, independently of the sign of e.
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