PHY 2054 Exam 2 Spring 2010 Key

PHY 2054 Exam 2 Spring 2010 Key - 77777 77777 PHYSICS...

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Unformatted text preview: 77777 77777 PHYSICS DEPARTMENT PHY 2054 Exam 2 March 17, 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 = 4 10- 7 Tm/A c = 3 10 8 m/s 1 eV = 1 . 6 10- 19 J 1 mi = 1.609 km 1mile/hour = 0.447 m/s 1. From her police car running at 70 mi/h, officer K sends a radar signal of a 28.5 mm wavelength to an SUV in front of her. The frequency of the signal, as measured on the SUV, is found to be lower by 94 Hz than the original. What is the speed of the SUV [in mi/h]? (1) 76 (2) 82 (3) 70 (4) 64 (5) 58 2. From her police car running at 70 mi/h, officer K sends a radar signal of a 28.5 mm wavelength to an SUV in front of her. The frequency of the signal, as measured on the SUV, is found to be lower by 188 Hz than the original. What is the speed of the SUV [in mi/h]? (1) 82 (2) 76 (3) 70 (4) 64 (5) 58 3. From her police car running at 70 mi/h, officer K sends a radar signal of a 8.75 mm wavelength to an SUV in front of her. The frequency of the signal, as measured on the SUV, is found to be lower by 204 Hz than the original. What is the speed of the SUV [in mi/h]? (1) 74 (2) 78 (3) 70 (4) 66 (5) 62 4. Which of the following units is correct for the product , where is the permeability of free space and is the permittivity of free space? (1) s 2 /m 2 (2) TC/J (3) TC/(sJ) (4) unitless (5) none listed here 5. In the circuit shown, E = 6 . 0 V, R = 100 . 0 , and L = 24 mH. What is the voltage across the inductor L immediately after the switch is closed? (1) 6.0 V (2) 0 (3) 25 kV (4) 1.44 mV (5) 0.40 V 77777 77777 6. In the circuit shown, E = 6 . 0 V, R = 100 . 0 , and L = 12 mH. What is the voltage across the inductor L immediately after the switch is closed?...
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PHY 2054 Exam 2 Spring 2010 Key - 77777 77777 PHYSICS...

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