physics exam 1 solutions

physics exam 1 solutions - 1 Exam I, Version 0001 - Physics...

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Vers.0001 1 Exam I, Version 0001 - Physics 1120 - Fall, 2008 NAME (print please)__________________________________________ Student ID #__________________________________________________ TA’s Name (Circle one! ): Carr, Chen, Gaebler, Kalkwarf, Meyer, Morrison, Xie Starting time of your Tues recitation (write time in box: 9am, noon, 1pm, etc) Please do not open the exam until you are told to. Your exam should have 10 pages, numbered 1 thru 10. This exam consists of 16 multiple-choice questions worth 80 points total (i.e., 5 points for each question), and two multipart long-answer questions worth 20 points total. Fill in the bubble sheet with a #2 pencil. PLEASE follow all directions carefully – if you don’t, we may not be able to identify your exam (which would be a disaster for you!) Place a check in each box on the left as you complete the instructions. Circle your TA's name. Print and bubble in your name on the bubble sheet. Print and bubble in your student Identification Number. Print and bubble in your Exam version, 0001 or 0002, in the upper left of your bubble sheet in the area marked 1234. Please leave the areas labeled Code and Date blank Erase mistakes as thoroughly as possible. Ask for a fresh bubble sheet if you fear you cannot thoroughly erase mistakes. As you take the exam, circle the correct answers on your exam as well as mark them on the bubble sheet, so we can grade the exam, if your bubble sheet is lost. At the end of the exam, check that you have filled in the first 18 questions on the bubble sheet, with only one bubble filled in for each question. I have read and followed the instructions above. Signature______________________________________________ Possibly useful information: eC 16 10 19 ., ε o SI units) 885 10 12 . ( , k = 1/(4 πε o )
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Vers.0001 2 1. Two charged particles are fixed on a line. The charge on the left has positive charge +2q , and the charge on the right has positive charge +q , as shown below. A proton is placed somewhere on the line in between the two charges as indicated on the diagram. If the proton is released from rest, it will initially A) accelerate to the left, no matter where it is placed. B) accelerate to the right, no matter where it is placed C) accelerate right, left, or remain stationary, depending on where it is placed. D) remain stationary, no matter where it is placed. Answers: C), this is because the E field between the two charges could point to either right or left, or could be zero, depending on the exact location. 2. A block of mass m and positive charge + q is placed on a frictionless ramp that makes an angle θ with the horizontal as shown. The magnitude E of a horizontal electric field is adjusted until the mass does not slide. A student draws the following correct force diagram for this situation, where N r represents the normal force of the ramp What is the magnitude of the charge q ? A) sin E mg B) E mg tan C) sin mgE D) tan mgE E) E mg Answers: B). Consider force balance in horizontal and vertical directions: qE=Nsin θ , and mg=Ncos θ . Eliminate N, and q=mgtan θ /E.
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This note was uploaded on 10/08/2008 for the course PHYS 1120 taught by Professor Rogers during the Fall '08 term at Colorado.

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physics exam 1 solutions - 1 Exam I, Version 0001 - Physics...

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