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2048_Fall09_Exam2 - 77777 Instructor(s Mueller/Saab PHY...

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77777 77777 Instructor(s): Mueller/Saab PHYSICS DEPARTMENT PHY 2048 Exam 2 October 26, 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) Hand in the answer sheet separately. Where needed use g = 9 . 80 m/s 2
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77777 77777 1. The weight of an object on the moon is one-sixth of its weight on Earth. The ratio of the kinetic energy of a body on Earth moving with speed V to that of the same body moving with speed V on the moon is: (1) 1:1 (2) 6:1 (3) 36:1 (4) 1:6 (5) 1:36 2. An object of mass 1 g is whirled in a horizontal circle of radius 0.5 m at a constant speed of 2 m/s. The work done on the object during one revolution is: (1) 0 (2) 1 J (3) 2 J (4) 4 J (5) 16 J 3. At time t = 0 a particle starts moving along the x axis. If its kinetic energy increases uniformly with time, t , the net force acting on it must be: (1) proportional to 1 / t (2) constant (3) proportional to t (4) inversely proportional to t (5) proportional to t 4. An ideal spring, with a pointer attached to its end, hangs next to a linear scale. With a 100-N weight attached, the pointer indicates “40” on the scale as shown. Using a 200-N weight instead results in “60” on the scale. Using an unknown weight W instead results in “30” on the scale. The weight of
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