2010_exam2 - 77777 Instructor(s): Profs. D. Acosta, H. B....

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77777 77777 Instructor(s): Profs. D. Acosta, H. B. Chan, P. Hirschfeld PHYSICS DEPARTMENT PHY 2053 Exam 2 March 25, 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. Constants g = 9 . 80 m/s 2 G = 6 . 67 × 10 - 11 N · m 2 /kg 2 1. A car with mass 1200 kg was traveling at 5.0 m/s immediately before it hit a large tree. Given that the car came to complete stop in 0.10 s, what was the average force on the car during the collision? (1) 60,000 N (2) 5,000 N (3) 15,000 N (4) 700 N (5) 145,000 N 2. Mass A (11 kg) travels towards the right at a velocity of 2.0 m/s. Mass B (2.0 kg) travels towards the left at a velocity of 3.0 m/s. After they collide head-on, mass B travels to the right with velocity of 5 m/s. Find the speed of mass A after the collision. (1) 0.55 m/s (2) 6 m/s (3) 2.4 m/s (4) 1.6 m/s (5) 3.4 m/s 3. A car with mass 900 kg collided with a motorcycle with mass 300 kg at an intersection. Right before the collision, the car traveled at 4.0 m/s towards the east and the motorcycle traveled at 7.0 m/s towards the south. If the car and the
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2010_exam2 - 77777 Instructor(s): Profs. D. Acosta, H. B....

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