sp07exam2soln

sp07exam2soln - Phys 222 Spring 2007 Exam 2, Wed 28 March,...

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Phys 222 Spring 2007 Exam 2, Wed 28 March, 8-9:30pm Closed Book, Calculators allowed Turn off all cell-phones, beepers, pagers, iPods, MP3s. . Any call will result in the end of your exam Each question is worth one point, answer all questions Please START from Question 25 Fill in your Last Name, Middle initial, First Name Your ID is the middle 9 digits on your ISU card. Please fill in your recitation section in special codes K to L For the H1 section please use section 18 At end of exam, please put exam writeup back in the folder, this allows you the chance to appeal the grading Best of luck, Craig Ogilvie
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25. Weak background noises from a room excite the fundamental standing wave in a cardboard tube of length L = 67.0 cm with two open ends. Assume that the speed of sound in the air within the tube is 343 m/s. What frequency do you hear from the tube? a. 256 Hz b. 512 Hz c. 1024 Hz d. 10.2 Hz e. 2.56 Hz 256Hz 0.67m) * 2 343(m/s)/( v/(2L) v/ f , 2 = = = = => = = λ f v L 26. The figure shows a sound source S that is moving to the right. The source emits sound at a certain frequency, and three stationary sound detectors detect the sound. Rank the detectors according to the frequency of the sound they detect from the source, greatest first. a. 3 larger than 2 which is larger than 1 b. 1 larger than 2 which is larger than 3 c. 1 same frequency as 3, both larger than 2 d. 1 larger than 3 which is larger than 2 e. 1 larger than 2 which is the same as 3 There is no Doppler shift for observer 3 since the motion of the source is at right-angles to that observer.
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27. A heart surgeon monitors the flow rate of blood through an artery using an electromagnetic flowmeter. Electrodes A and B make contact with the outer surface of the blood vessel, which has interior diameter 3.00 mm. For a magnetic field magnitude of 0.040 T, an emf of 160 V μ appears between the electrodes. Calculate the speed of the blood. a. 16.2 m/s b. 8.2 m/s c. 5.6 m/s d. 4.2 m/s e. 1.3 m/s Magnetic force moves +ve charges to the top of the artery, negative charges to the bottom. This continues until the electrical field builds in strength large enough to oppose this force. Equilibrium occurs when these forces have the same magnitude but opposite directions => the force on a moving charged particle is zero. s m T m V lB V v vB l V vB E qvB qE / 3 . 1 ) 040 . 0 * 10 * 3 /( 10 * 160 ) /( / 3 6 = = = => = => = => = 28. In the figure below, assume i 1 = 2 A and i 2 = 6 A. What is the relationship between the magnitude F 1 of the force exerted on wire 1 and the magnitude F 2 of the force exerted on wire 2? a. F 1 = 6 F 2 b. F 1 = 3 F 2 c. F 1 = F 2 d. F 1 = F 2 /3 e. F 1 = F 2 /6 Forces are equal and opposite by Newton’s 3 rd Law
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29. A solenoid carries a current I. An electron is injected with a velocity v along the axis AB of the solenoid. When the electron is at C, it experiences a force that is a. zero b. not zero and parallel to the direction from A to B c. not zero and parallel to the direction from B to A
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This note was uploaded on 03/26/2008 for the course PHYS 222 taught by Professor Johnson during the Spring '07 term at Iowa State.

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sp07exam2soln - Phys 222 Spring 2007 Exam 2, Wed 28 March,...

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