PHY 2054 Exam 1 Spring 2010 Key

PHY 2054 Exam 1 Spring 2010 Key - 77777 77777 PHYSICS...

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Unformatted text preview: 77777 77777 PHYSICS DEPARTMENT PHY 2054 Exam 1 February 12, 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 7680 on the answer sheet for the 5-digit number) . Code your name on your answer sheet and 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 . (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, Prefixes, and Units g = 9 . 80 m/s 2 e = 1 . 6 10- 19 C micro, = 10- 6 G = 6 . 67 10- 11 Nm 2 /kg 2 m e = 9 . 11 10- 31 kg nano, n = 10- 9 k E = 8 . 99 10 9 Nm 2 /C 2 m p = m n = 1 . 67 10- 27 kg pico, p = 10- 12 = 8 . 85 10- 12 C 2 /N/m 2 c = 3 10 8 m/s 1 eV = 1 . 6 10- 19 J 1. Particle 1 has a mass of 1.0 g and charge 6.0 C, and particle 2 has a mass of 2.0 g and charge 3.0 C. While particle 2 is held in place, particle 1 is released from rest at a distance of 2.0 mm from particle 2. After a long time, what is the speed of particle 1 [in m/s]? (1) 400 (2) 520 (3) 660 (4) 290 (5) 870 2. Particle 1 has a mass of 1.0 g and charge 6.0 C, and particle 2 has a mass of 2.0 g and charge 5.0 C. While particle 2 is held in place, particle 1 is released from rest at a distance of 2.0 mm from particle 2. After a long time, what is the speed of particle 1 [in m/s]? (1) 520 (2) 400 (3) 660 (4) 290 (5) 870 3. Particle 1 has a mass of 1.0 g and charge 6.0 C, and particle 2 has a mass of 2.0 g and charge 8.0 C. While particle 2 is held in place, particle 1 is released from rest at a distance of 2.0 mm from particle 2. After a long time, what is the speed of particle 1 [in m/s]? (1) 660 (2) 520 (3) 400 (4) 290 (5) 870 4. Four point charges are placed at the four corners of a 3.0 cm 3.0 cm square, in two different configurations as shown in the figure. The magnitude Q of the charges is 3.0 C. Which configuration has higher electrical potential energy and what is its value [in J]? + Q + Q Q + Q + Q (1) (2) Q Q Q (1) Config. 1,- 3 . 8 (2) Config. 1, 0 (3) Config. 2, 10.8 (4) Config. 2, 0 (5) Both have zero energy 5. Four point charges are placed at the four corners of a 3.0 cm 3.0 cm square, in two different configurations as shown in the figure. The magnitude Q of the charges is 2.0 C. Which configuration has higher electrical potential energy and what is its value [in J]?...
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This note was uploaded on 10/13/2011 for the course PHY 2054 taught by Professor Avery during the Spring '08 term at University of Florida.

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PHY 2054 Exam 1 Spring 2010 Key - 77777 77777 PHYSICS...

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