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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
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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 99": I=‘°‘°I°
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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.” 41
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UseA Tahiti". deﬁedY 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‘ ii: 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)
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: 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"“
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409 5;; mt Z3lm° QM”: 0.093
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0vm< ' F 5&9 _g rim ismMM = 7'54 sallms
.l .
.(0 Not MvHiJiir'“: '9'” “'=‘ ‘
_ — — '— \l = U
L‘ 092. A11AZ Or A{ (6A1 or Ut'ggl ab ( a 4 059— 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
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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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 Spring '08
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