PHY2054 - Fall 2006 Final

PHY2054 - Fall 2006 Final - 77777 77777 PHYSICS DEPARTMENT...

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Unformatted text preview: 77777 77777 PHYSICS DEPARTMENT PHY 2054 Final Exam Fall, 2006 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) The answers are rounded off. Choose the closest to exact. There is no penalty for guessing. If you believe that no listed answer is correct, leave the form blank . (6) Hand in the answer sheet separately. Constants g = 9 . 80 m/s 2 e = 1 . 6 10- 19 C 1 C = 10- 6 C G = 6 . 67 10- 11 Nm 2 /kg 2 m e = 9 . 11 10- 31 kg sin45 = 1 / 2 k E = 8 . 99 10 9 Nm 2 /C 2 m p = m n = 1 . 67 10- 27 kg = 4 10- 7 Tm/A = 8 . 85 10- 12 C 2 /N/m 2 1 eV = 1 . 6 10- 19 J c = 3 10 8 m/s 1. Electrons in a particle beam have a kinetic energy of 3 . 2 10- 17 J. What is the magnitude of the electric field that will stop these electrons in a distance of 0.1 m? (1) 2000 N/C (2) 1000 N/C (3) 500 N/C (4) 4000 N/C (5) 200 N/C 2. Electrons in a particle beam have a kinetic energy of 3 . 2 10- 17 J. What is the magnitude of the electric field that will stop these electrons in a distance of 0.2 m? (1) 1000 N/C (2) 2000 N/C (3) 200 N/C (4) 4000 N/C (5) 500 N/C 3. Electrons in a particle beam have a kinetic energy of 1 . 6 10- 17 J. What is the magnitude of the electric field that will stop these electrons in a distance of 0.2 m? (1) 500 N/C (2) 2000 N/C (3) 1000 N/C (4) 4000 N/C (5) 200 N/C 4. A pair of insulated parallel plates, forming a capacitor, are charged with opposite charges. The plates are pulled apart to double the original separation. What is the ratio of the final energy stored to the original energy stored? (1) 2 (2) 4 (3) 0.5 (4) 1 (5) 0.25 5. A pair of insulated parallel plates, forming a capacitor, are charged with opposite charges. The plates are pushed together to half of the original separation. What is the ratio of the final energy stored to the original energy stored? (1) 0.5 (2) 4 (3) 2 (4) 1 (5) 0.25 6. A pair of insulated parallel plates, forming a capacitor, are charged with opposite charges. The plates are pulled apart to quadruple the original separation. What is the ratio of the final energy stored to the original energy stored?...
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PHY2054 - Fall 2006 Final - 77777 77777 PHYSICS DEPARTMENT...

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