q4-ef152-2008-08-soln

q4-ef152-2008-08-soln - EF 152 Exam #4, Fall, 2008 Name: 3...

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Unformatted text preview: EF 152 Exam #4, Fall, 2008 Name: 3 ecu Ti 0 N Guidelines: Assume 3 significant figures for all given numbers unless otherwise stated Show all of your work — no work, no credit Write your final answer in the box provided Include units for all answers Include directions for all vectors Fluids p — pressure h — height p — mass density v — velocity K — empirical constant A — area BemouiI/i's Equation 1 p.+§flv5+pgii: 1 pz+3pv§+Pgla M LEpKsz _| Speed of Sound in Air v : (331+0.6OT)m/s Tin “C Density of Water 624 ib/rt3 1000 kg/m3 Uniform Circular Motion u” — centripetal acceleration v — speed p e radius of curvature w — rotational speed T— period f —frequency 05 — angle v2 [1" : — (any curve) p an = 0502 v : (up T : 21 a) = i 7 T As = pA¢ a) : 24f Natural Frequencies: Air Columns ll — wavelength L — Length f — frequency v — velocity v = N First harmonic: A = 4L (closed pipe) /l = 2L (open pipe) Page 1 of 6 Doppler Shift fa — frequency f' — shifted frequency v — velocity of medium vs — velocity of source v, — velocity of observer Moving source towards w ._ f0 f _1~(v\/v) Moving observer towards source #4134] V Opposite signs (+,-) used for source/observer moving away from observer/source. Section: L l3 Beat Frequency: 1‘; — f1 Sound Level I0 — reference intensity. 1x1012 WIm2 /— intensity ,8(in dB)=1010gIL U Page 2 of 6 EF 152 Exam #4, Fall, 2008 ‘la (4pts) How must the intensity of a sound he changed to cut the loudness of it in half? Fa;\pr of? \D C“ ortrlgr oi Munich/Ac 1b (4pts) A musical instrument is tuned to play at a frequency of 432 Hz. When another instrument is played with this instrument, a beat frequency of 4 Hz is heard. What are the possible frequencies of the other musical instrument? 4—32: 4 : 4 28 H; gr 4343 Hi 10 (4pts) Circle the correct relationship of the pressure at the base of the darn. assuming the water level is 80 ft in each case. Amount of water impounded Dam is 100 ft long and impounds 1 mile of water Dam is 300 ft long and impounds 3 miles of water Dam is 100 ft long and impounds 3 miles of water Dam is 100 ft long and impounds 3 miles of water presSurL onlfi a. ¥UAL*»DK a; del3LL\. ength of darn" 1d (4pts) Determine the required area for an airplane wing to lift a 40000 N plane when it is flying at 150 m/s. (K= 0.12 and p = 1.2 kg/m3) L‘QKHVZ . 7. Accrcott: Liza (0.1L}Q(\So )5) 7. 919.3 m Page 3 of 6 EF 152 Exam #4, Fall, 2008 2‘ Six drummers produce a sound level of 110 dbel. If each of the drummers produce the same intensity, what is the sound level in decibels of one drummer? [- “i at ; M ”" L a: Bn"\o\o=5’1: a 9-9": I=‘°‘°I° BUG) ‘ ‘°‘°i\ It ~ 9: °’t (0’1 l*\D_n DJ/M 7' \\o AB ; l0 \o<3 3‘ -_ Bn‘ ‘o‘o=]("\ -1 GAV‘iha T, INA> & C Cycle—7 w/M 2 0(L3722>( [Menu/~13 \ I t W (a 1 09.37911]: 8 : 102,7. <l B J. _ Boat. 1 \D‘cfi—‘E: — \O\°3 l"\)"l°‘J/Mz 3‘ An open organ pipe needs to produce a frequency of 192 Hz. Determine the required length of the organ pipe if the organ is played in a room with a temperature of 15°C V : Zslyotco‘i‘: 33i+o.co(\s‘<) = 34o M/s M EL: 3—41—11— : invlm ifile V=1§ or 1" . =1:- LQ—M 20.8857» p'ipe' L- 1 ‘ Z. O P‘A i L —4 1, w «J EF 152 Exam #4, Fall, 2008 Page 4 of 6 4‘ You are driving at 80 mph. while being chased by a police car that is moving at 100 mph. The police car’s siren emits a sound at 400 Hz. Determine the frequency that you hear. Assume the speed of sound is 767 mph. emu” ‘.=\.4i.,_,\ i, PM c, Tart 3, Ram.” 4-1 4 l 7. H: l l_ Shana Source. ‘1: 49° v You are. oios<ru¢r Gwax‘ l J... 4DW‘,J5 aLficlutr g : :0 < ‘_ Y\% 9 AA M \I\ J Fc\‘\ce Cof is Sovrt—a (‘V‘D'v‘ircs v \ _33 F: - 7E1 _ l 19:: ‘_ V ': AOOHZ _/_._ _ [UZVOHz Comk‘mcd 0 Vs ‘ Lie — 7 7L7 Uxar th<V~~\BI gr Adafihln-{sl bdrm»:E 633* 1" V ‘ UseA Tahiti". defied-Y 5. Determine the total force on one side of a 30 ft wide x 30 ft long x 12 ft deep swimming pool that is filled with water, 05.; overeat“; ran—.15.”; (\1QP)<LD?..4\L/g‘i1>= 374,4 .958- .3 (eatiulm ’ ‘34?“ [L‘ i-i: Lieric¢ ar1q Uslnni FVCLJI" gs» Lam Fail; “kaolin. .0 ml Q) A l 69 05...: 91,4 a: war; as. 7 l EF 152 Exam #4, Fall, 2008 Page50f6 6. An engine block weighs 1200 N. When hung from a scale and completely suspended in water, the scale reads 800 N. Determine the volume of the engine block. 3 = \l ever” 9 o, \LcJ M 1> T Flawed 400M 1 V( LL (q‘gt )5 m1 u) @‘)Sir.: Sufi New“ of lei-KL FED just l’wmi F3 7’“ t M + F J goo M 0 08 W l 5W @ we FEW”: w-T ’—'\‘2_ool\i “BOOM @ -: 400N 7. Water moving at 5 ft/sec enters a lawn sprinkler system through a 1 inch diameter pipe. The pipe is divided into eight different sprinkler heads, each having the same amount of flow. Determine the number of gallorE of water one sprinkler head provides to the lawn in one hour. (1 gallon = 231 in3) ’4 _ do 51-]; fl ' 1. ai/itr “Winkle UM: - 95m 7‘ 3 a: r a ‘7 m O‘\.E\ OQRUMS gilt; 9/5 (h [£31m = 0.01717 FP/SQL Q . : V9 ‘ 5 7' 17m l\31(l¢. . 9+7 5"“ Q _ 0P": _ O,co’340°l 5:; \\<¢—J “ 8 £13 .3 .Lcigi ': 0.028S01a113<g 409 5;; mt Z3lm° QM”: 0.093 \/i ~ Qt - seminar) Mar - géfii‘e-L : Weevil“; 0vm< ' F 5&9 _g rim ism-MM = 7'54 sallms .l . .(0 Not MvHiJiir'“: '9'” “'=‘ ‘ _ — — '— \l = U L‘ 0-92. A11AZ Or A{ (6A1 or Ut'ggl ab ( a 4 0-59— A 367 3.111 EF 152 Exam #4, Fall, 2008 Page 6 MB 8. Water is flowing through a 4 inch diameter fire hose with a speed of 7 ft/sec. The hose goes up an 18 ft high ladder and exits through a 1 inch diameter nozzle, Determine the required gauge pressure at the bottom of the hose. \5 \3ZDO 5L \[\Q\‘-\/1A1 2 if mural = Mm “6 - fill“ V'L ’ \\Z S \ L self CKQ‘UM \‘x i ‘?V * \be‘flw i 9V1 : Vitecl 1 7. 2 a laith 2 ' i.) z _. lb 3 Z .1 my 9 P. + o *éié-mflf“ WW) = c» wildieiizlm 2. 5‘ \5 Lil t aye i. iZl‘S‘l‘fi P ‘4' 45$¥L 1 QU- Sr? 15 - ?\:‘312q§;z - Cli.9r>s @ 051% (3214 A: Mag: agtg‘lj C l r . ‘ z i . “9+ ira‘ulll‘s {QVI :«J t we: 42 @ Hind 5:- and Easlish unit’s Please remain seated if there are less than 5 minutes to go in the exam so as not to disturb those still trying to finish. If you finish early you should go back and check your work. Z )w/J ...
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q4-ef152-2008-08-soln - EF 152 Exam #4, Fall, 2008 Name: 3...

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