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Unformatted text preview: 77777 77777 Instructor(s): Mueller/Saab PHYSICS DEPARTMENT PHY 2048 Final Exam December 12, 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 7680 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 77777 77777 1. A motorist drives along a straight road at a constant speed of 60 m/s. At time t = 0 she passes a parked motorcycle police officer. The officer takes off after her at t = 0 and accelerates according to the formula a ( t ) = bt , where t is the time and b is a positive constant. What is the speed of the police officer when he reaches the motorist? (1) 180 m/s (2) 240 m/s (3) 160 m/s (4) 120 m/s (5) need to know b 2. Three blocks (A,B,C), each having mass M A = M , M B = 2 M , M C = 3 M are connected by strings on a horizontal frictionless surface as shown in the figure. Block C is pulled to the right by a horizontal force of magnitude F that causes the entire system to accelerate. What is the magnitude of the net horizontal force acting on block B due to the strings? (1) F/ 3 (2) F/ 2 (3) 2 F/ 3 (4) zero (5) F 3. A particle moves along the x axis under the influence of a conservative force. The potential energy is given by U ( x ) = A ( x- b ) 2 , where x is position of the particle and...
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