Phy 102 Fall 2007 Exam 2

Phy 102 Fall 2007 Exam 2 - Physics 102 Exam#2 ‘3 A, it...

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Unformatted text preview: Physics 102 Exam #2 October 24, 2007 ‘3: A , .. ,,« it..- PLEASE DO NOT SEPARATE EXAM PACKET! k7" r- 5/ 6-- j. . In order to obtain full credit for problems 17 and 18, you must show your assumptions and work clearly and Iegibly. They are worth 20 points each. For problems 1-15. place your letter answer on this sheet below. Probiems 1-15 are worth 4 points each. You may be asked to show your photo ID. upon submitting the exam. 1, D a. E 2. - {5/ 9. ED - Dr. Sharon T.- Zane 15. $2 . 16. __ - 5 nus A) [01] A device which converts electrical energy to mechanical energy is called a(n) [A] generator [B] capacitor [C] alternator ($910101 yer miracle ”\- ([0an 10 11F capacitor is connected in series with a 20 hi! resistor across a 12- VD? source and an open switch Ifthe switch 1s closed at t== 0 s, what' 1s the charge on the capacitor at t = 15 95 as a percent of the maximum charge, Q0? /, Wc- [3119214. [mm [ma-1% [E]45% [03] Which of the following scenarios will NOT produce an electromagnetic wave? QM AC current in a bare copper loop _/_ i :5“) A charged rubber rod moving at constant spwd<~ t [C] A WWW down electron travelin [B] All of these Will produce an EM wave [04] A solenoid has N = 1353 turns, carries a current of 2.000 A and has a length of 34.00 cm. The value of the magnetic field generated at the very center is .00 mT [B] 3.400 mT [C] 0.1000 mT [1)] none ofthese . voltmeter measures the voltage of a household electrical outlet to be 120 VAO This value 15 the U [A] average voltage [B] voltage [C] peak voltage E) [D] minimum voltage [06] An electromagnetic wave is propagating in the +z-d1rection Ifthe E -field of this wave is u ing in the -y direction, the direction 1n which the B —field points must be ‘1: [B] +y [C] —x [D] -—z [E] none of these ,_ __ . - // [07] A very ‘fiech-saavy” penguin is standing on an ice floe at the South Pole, holding a [if compass vertically. The needle of her compass points [A] to the east [B] to the west [ - straight down into the ground [D] straight up in the air one of these . done by the magnetic field on a charged particle is equal to @g $97 7“ E) [D] BLAE {@9118 of these (I? , [09] Dr.Bruce Bmmer requires exposure to gamma rays of a minimum fiequency 8.5 x 1021 Hz in order to become the lie Hulk. The wavelength of these gamma rays is [A] 2.8x1013m .5x10'14m [C]3.5um [D] frequencies this high onot exist [E] none of these [10] A certain device requires 20 VAC for safe operation. It is plugged into a household outlet rim (120 VAC). The turns ratio, fly— , of the adaptor’s internal transformer is [A] 0.17 [B] 60 [l3] none of these [1 l] A household clothes dryer is plugged into an outlet designated as “220 VAC”. The maximum voltage in the outlet is %fl@l/V5§ [B] 220 VAC [C] 156 VAC [D] none of these [12] Suppose we have a long narrow coil and wish to decrease its inductance. That can be accomplished by fl]? decreasing the length "fBiincreasing-the'cmwnt- reasing the crossosectional area [D] increasing the number of turns none of these [13] The plug-in GFCI (Ground Fault Circuit Interruptor) into which your hair dryer is plugged keeps “tripping”. The most sensible thing for you to do is l the GFCI out of the outlet and plug your hair dryer in directly. your hair dryer to a difi'erent outlet with a different GFCI and try it there. plug a difi'erent device into the existing GFCI to see if it trips. [D] B and C are both good ideas /[EJ*take your hair dryer outside and beat it with a hammer. [14] An unpolarized beam of light of intensity Io passes through two successive olarizers. The axisofthe l‘polarizerisatanangleof20°tothevertical andthatofthe2 isatanangle of 65 ° to the vertical. The intensity of the light emerging from the 2M polarizer is . 510 [310.4410 [C] 4 figs: [E] none of these [15] A 200th particle with a mass of 4.00 x 10" kg moves perpendicular to a 5.00-T magnetic field in a circular path of radius 25.0 m. The speed of the particle is [A] 0.016 m/s .25 m/s [C] 0.5 m/s [D] none of these [16] A tee-shirt, which has printing on the front, appears to be black and white while indoors. However, when the shirt is view outdoors in natural sunlight, vivid colors appear on it. This is an example of [A] electromagnetic induction I: the photoelectric effect [C] magic she photochromic effect [D] polarization IWMF 0K+ Wuhuhq’ : V 0* @ © \Imm ”- Imax R Vrms m TF2 'Uq‘TVZImafiOWSIL\ I20: m I’ISJL V3 WM“: '(DQTIV ® 731% . I Vail 7 El 1 Us?“ 7< 121m: \ " Cr/ Elli!!! UWMD-‘HIH ms 6?) flopow—w—‘oMm-fio ZiHS",/Q, [17] The circuit pictured below has an AC source whose frequency is variable. 1750 QWWSJL L — 010x. 10 J H @Vms=120.0V _ . C _J is; x, W J, F f = 60.0 Hz 130pF Moulate the impedance for the circuit as depicted (f= 60 Hz) Calculate the resonant fi'equeucy for the circuit. in m 'f'l _. . {9] Calculate Innx for this circuit [D] What is the impedance of this circuit in the high-frequency limit (f —r so)? What is the current in the circuit for this fi’equency? What is the impedance of this circuit in the Iow-fiequeucy limit (f -+ 0)? What is the current in the circuit for this fi'equency? 9 Z 1 m1 ”L: ”3LT NULL 'ZTFWOY-‘ws '7— 33 . 01 fl. _ i .. l ' | x _ , fin : _ L ”JR“ 2W1“; ZTTf-‘rbjogfltde :W Eat-(ET Xc 1 . _ __. . - . ._ _. Z? a \iOTfi-D 1‘ (337- Dr (p.391: ELI 8 8 JL 3- imp-Ddancfj 6) Q 98000:“ L“; - mixers-nu x L 2' >< L l i 2‘ ]_I' r "Q. ____.____________..._.___'_._......_.._,———— r’ - _J__ .71 . 1 1 i :3 WWW;— IO 1 {' i)Jb lJ—Lr ii, /’ IJ-(QOK lo- QJUCVI'T) f. 10’ '1?) [18] The figure shows a zero-resistance rod sliding to the right on two zero-resistance rails separated by the distance L = 0.50 m. The rails are connected by a 100.0 (2 resistor, and the entire system is in a uniform magnetic field with a magnitude of 0.90 T. @706) G) G) (r [A] Find the speed at which the rod must be moved to produce a current of 0.250 A in the resistor. [B] Find the force that must be exerted on the rod in order to maintain this current. [C] Find the power dissipated by the resistor. ( [D3 Find the mechanical power delivered to the rod. ® 02.5% EcT‘Bfl/ R: IOQJL I R"; TESL £93”: .FIT ‘9 _ - _; LE; f l' -' ,- '|| __I :2— E; ‘_-__'—— _' -I_:\ ’ ’J k j ) ...
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