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CU 2009 sp final exam key

CU 2009 sp final exam key - 1 of 15 Final Exam vers 0001...

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1 of 15 vers 0001 5/7/2009 Final Exam, vers. 0001 - Physics 2010 - Sping, 2009 NAME_______ANSWER KEY________________________________________________ Signature_____________________________________________________ Student ID #__________________________________________________ Circle your TA’s Name : Uriel Nauenberg, Alysia Marino, Gabriel Ycas, Weisen Shen, Chen Zhang, Joseph Yelk, Qi Hu Please write the DAY/START TIME of your recitation/lab section in the box. Enter Mon/10am, Tues/Noon, etc. Please do not open the exam until you are told to. Your exam should have 13 pages, numbered 1 thru 13. The last sheet is for scratch paper. This exam consists of 40 questions, worth 5 points each for a total of 200 points. Fill in the bubble sheet with a #2 pencil. Please fill out your bubble sheet according to the following instructions or you will automatically lose 10 points . Check each box as you complete the instructions. Please circle your TA's name above and place DAY/START TIME in box. 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. 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 and mark them on the bubble sheet. That way we can grade the exam, if your bubble sheet is lost. Possibly useful information: The magnitude of the acceleration of gravity: g = 9.8 m/s 2 . π ~ 3.14. G = 6.67 x 10 -11 Nm 2 /kg 2 . I ring = MR 2 I disk = (1/2) MR 2 I sphere = (2/5) MR 2 I Hollow Sphere = (2/3) MR 2
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2 of 15 vers 0001 5/7/2009 1. A bicycle is moving in the positive direction with a constant velocity of +5 m/s. The brakes are applied and it takes 2 seconds to stop the bike. The acceleration of the bike while the brakes are applied A) is zero B) is positive C) is negative D) changes sign. 2. If you drop a ball from rest, what is the change in speed of the ball during the time interval between t = 1 seconds and t = 4 seconds? (Assume no air resistance). A) increases by 2.45 m/s. B) increases by 4.9 m/s. C) increases by 9.8 m/s D) increases by 19.6 m/s. E) increases by 29.4 m/s. Δ v = gt 2 gt 1 = g Δ t = (9.8)(3) m / s = 29.4 m / s 3. The velocity of an object that is moving with constant acceleration is shown at two different times: v 1 is the velocity at an earlier time and v 2 is the velocity at a later time. What is the direction of the acceleration of the object? A) Up B) right C) Down D) Left E) Some other direction. Δ v = v 2 v 1 = (3, 1) (3,1) = (0, 2)
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