2048_Spring10_FinalExam - 77777 Instructor(s Matcheva/Sabin...

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77777 77777 Instructor(s): Matcheva/Sabin PHYSICS DEPARTMENT PHY 2048 Final Exam April 24, 2010 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. A motorist is driving along a straight road at a constant speed of 60 m/s. At time t = 0 she passes a parked motorcycle police officer and begins to accelerate at a constant acceleration a . The officer takes off after her at t = 0 and accelerates at a constant acceleration of 2 a . What is the speed of the police officer when he reaches the motorist? (1) 240 m/s (2) 180 m/s (3) 160 m/s (4) 120 m/s (5) need to know a 2. If ~ A · ~ B = -| ~ A × ~ B | and neither ~ A or ~ B is zero, then the angle between them is: (1) 135 (2) 45 (3) 0 (4) 180 (5) 150 3. Near the surface of the Earth, a shell with mass M is shot with an initial velocity ~v 0 , at an angle of θ 0 with the horizontal as shown in the figure. At the top of the trajectory, the shell explodes into two fragments with mass m 1 and m 2 ( M = m 1 + m 2
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2048_Spring10_FinalExam - 77777 Instructor(s Matcheva/Sabin...

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