2048_Spring09_Exam2

2048_Spring09_Exam2 - 77777 Instructor(s):...

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77777 77777 Instructor(s): Hirschfeld/Matcheva PHYSICS DEPARTMENT PHY 2048 Exam 2 March 16, 2009 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 answer sheet (use lines 76–80 on the answer sheet for the 5-digit number) . Code your name on your answer sheet. DARKEN CIRCLES COMPLETELY . Code your UFID number on your answer sheet. (2) Print your name on this sheet and sign it also. (3) Do all scratch work anywhere on this exam that you like. Circle your answers on the test form. At the end of the test, this exam printout is to be turned in. No credit will be given without both answer sheet and printout. (4) Blacken the circle of your intended answer completely, using a #2 pencil or blue or black ink . Do not make any stray marks or some answers may be counted as incorrect. (5) The answers are rounded off. Choose the closest to exact. There is no penalty for guessing. (6) Hand in the answer sheet separately. Where needed use g = 9 . 80 m/s 2
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77777 77777 1. Which of the following has the largest kinetic energy? An object with: (1) Mass 2M and speed 3V (2) Mass 3M and speed V (3) Mass 3M and speed 2V (4) Mass M and speed 4V (5) Mass 40M and speed V/2 2. A 0.50-kg object moves in a horizontal circular track with a radius of 2.5 m. An external force of 3.0 N, always tangent to the track, causes the object to speed up as it goes around. The work done by the external force as the mass makes one revolution is about: (1) 47 J (2) 24 J (3) 59 J (4) 94 J (5) 120 J 3. A particle starts from rest at time t = 0 and moves along the x axis. If the net force on it is proportional to the time t , its kinetic energy is proportional to: (1) t 4 (2) t (3) t 2 (4) 1 /t 2 (5) none of these answers 4. A particle moves through an xyz coordinate system while a force acts on the particle. When the particle has the position
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2048_Spring09_Exam2 - 77777 Instructor(s):...

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