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Unformatted text preview: 77777 77777 Instructor(s): A. Hebard/J. Klauder PHYSICS DEPARTMENT PHY 2048 Test 2 October 23, 2007 Name (print, last first): Signature: On my honor, I have neither given nor received unauthorized aid on this examination. YOUR TEST NUMBER IS THE 5-DIGIT NUMBER AT THE TOP OF EACH PAGE. (1) Code your test number on your green answer sheet (use 7680 for the 5-digit number) . Code your name on your answer sheet. Darken circles completely. Code your UF ID number on your answer sheet. (2) Print your name on this sheet and sign it also. (3) Do all scratch work on this exam to the right of the questions, and anywhere else on this exam that you like. At the end of the test, this exam printout is to be turned in. No credit will be given without both the answer sheet and printout, with the scratch work which most questions demand of anyone. (4) You will receive one point for each correct answer and zero points for an incorrect answer or no answer. (5) Use a number 2 pencil on the answer sheet. Do not make any stray marks, or the answer sheet may not be read properly. >>>>>>>> BEFORE YOU FINISH <<<<<<<< Fold the exam so that your name is on top, include any figure sheet inside the printout. Hand in the answer sheet separately. Possibly useful equations: Rotational kinematics ( constant): = d dt , = d dt = d 2 dt 2 , translation rotation = + t + 1 2 t 2 s = r , v = r , a = r = + t K Rot = 1 2 I 2 77777 77777 1. One end of a 1.0-m long string is fixed, the other end is attached to a 2.0-kg stone. The stone swings in a vertical circle, passing the bottom point at 4.0m/s. The tension force of the string at this point is about: (1) 52N (2) 12N (3) 20N (4) 32N (5) 0 2. An automobile moves on a level horizontal road in a circle of radius 30m. The coefficient of friction between tires and2....
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