P2213 Prelim Exam 1 S09 - Your Name Recitation Instructor's...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Your Name Recitation Instructor's Name: Recitation Section #: Physics 2213 February 26, 2009 Prelim Exam #1 7:30 - 9 PM PLEASE BE SURE THIS PACKET HAS 16 PAGES ! ( This includes the cover sheet.) This packet contains 5 Short Answer Questions , 4 Problems , 1 page of scratch paper, and a page of Possibly Useful Information . Write your answers ON THESE QUESTION SHEETS in the spaces provided. For Short Answer Questions #1-5, ONLY ANSWERS WILL BE GRADED, unless calculations or constructions are explicitly requested. For Problems #6-9, where algebra or computations are required, BE SURE YOUR METHOD OF SOLUTION IS CLEAR, and SHOW ALL YOUR WORK in the spaces provided. If you need more space, use the backs of the question sheets and indicate the whereabouts of your work for each question. ANSWERS WITHOUT WORK will NOT receive credit (except for short answer questions). WORK ON SCRATCH PAPER WILL NOT BE GRADED. Point values for questions are given by each problem and below. BUDGET YOUR TIME. Don't spend too much time on any one question or part of a question. Answer those questions you can do easily first, and then return to the more difficult ones. It is valuable use of your time to READ THE ENTIRE EXAM before starting to work on it. This is a CLOSED BOOK and CLOSED NOTES exam. You may NOT use any other references or personal assistance. You MAY use a NON-GRAPHING, NON-PROGRAMMABLE calculator. For Grading Only: 1-2 /8 6 /10 3 /10 7 /14 4-5 /10 8 /24 9 /24 TOTAL /100
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 I. SHORT ANSWER [28 points] Write your answer letters in the spaces provided. 1. [6 points] True OR False (Please write T or F in the spaces.) (a) An electrically charged object cannot exert an attractive electric force on an electrically neutral object. (b) The maximum magnitude of electric charge that the 0.25 m diameter spherical metal dome of a Van de Graaff generator like the one used in lecture can hold before sparking is typically around a millicoulomb. (c) It is not possible to have a steady non-zero electric current going through a material with exactly zero potential difference along the material in the direction of this current. (d) When a switch in an electric circuit is open, the voltage between the switch's terminals must be zero. (e) Since a light comes on essentially instantly when its switch on turned on, this means that electrons move from the switch to the light bulb essentially instantly in order to activate the electric circuit. (f) The electric potential is necessarily zero throughout the interior of an electrically charged closed, thin, hollow, circular metal shell in electrostatic equilibrium. 2. [2 points] The heating element in an electric toaster is a zig-zag of wire with high resistance which gets hot because it dissipates electrical power. Suppose you decide to modify your electric toaster by cutting out half the length of its heating element and reconnecting just the remaining half back into place. If your roommate then puts a bagel into the toaster for the same amount of time as usual, how will the bagel now be toasted?
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 03/07/2010 for the course PHYS 2213 taught by Professor Perelstein,m during the Spring '07 term at Cornell University (Engineering School).

Page1 / 16

P2213 Prelim Exam 1 S09 - Your Name Recitation Instructor's...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online