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Unformatted text preview: Test# 000133 EXAM 4: Fltﬁds, Waves. 5. Smmd
Physics 180A
Fall. 2004
ALL numbers are good to 3 signiﬁcant ﬁgures. Answers may be rounded to 2 signiﬁcant ﬁgures. Use a number 2 pencil for the ParSCORE farm and avoid erasure.
if you smudge the answer farm. switch to another one. Assume on this test that: ﬂiesneedcfsoundisBﬂ we. tiederﬁtycfwaterispﬁm=1000kgfm3
1Atmaspherenfpresstre=L0131105 Pa Put your ParSCORE form behind this page when the test is ﬁnished. _,.. I” I" ‘1” .F' I» 'illf fl Name  Please Print You must hand in this form with
the ParSCORE form or no credit. qo'l’ﬂ A M
70:69 3, ﬁat—lei: a
60* r L 6‘3 *3: E;
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4,. F 96*53 D “34:5? F LTheoperatiunafahydraulicjackismappﬁcationuf e. the continuity equation. Zhuainisblohingitswhistleasit'appmadiesthetminstatim. Tomobservaat
thestaﬁuxmevdﬁsueseemsmhmafrequmcynfwzowatﬁmand IOOOHz
aﬁeritstops. Whatwasthespeedtuthetrainwhenitwasﬁrst heard? Amethe
speed of sound is 343 mfs. 9’
r: r_—'
*F " "w?
R ran: 2 (/31: “N
WEI~15:
LEI? : 1V3. 1' 1
.35 3. The tension in a taut (stretched) rope is increased by a factor of 9. How does
the speed of wave guises on the rope change. if at ali? a.ltisred1.medbyafactorof9.
b. It isredmedbyafactorofl okismdtanged. Fr—
@tishueasedhyafactorofi T, or
e.ltisinu'easedbyafactorof9. ”T" 4.A2.0mlongstﬁngisvihretingmeloops(4antinodes]. Ifthetensioninthe
stringis1DONandmeuibrationalfremencyis140Hz,wl'atisﬂ1emasspermit
length {u}ofthestring? a. 3.09 gfrn
b. 3.91 gfm
5.10 gfrn r’T‘ '1"
.5.94g.rm $1...“ {2.1.
e. none of these 41' ' “" 5. Which will result in beats? 3.1Tresupa'pcsiﬁnnnfwavesﬁuttravelvﬂﬂ1tifferentspeeds
b.Thesupemosiﬁonefidmticaiwavesthattrauelh1ﬂresamedrectian
nmmﬂmmthattmvelinmedmﬁms
d. The mperpasitinn nf wares that are identical except for slightly different
amplitudes
Themmsiﬁonnfwavesﬂmtareidenﬁcalexceptforsligmydiﬁm
uennes 6. A 4 kg block of aluminum (9 = 2,700 kgfmi) is suspended in water by a string
from above. What is the tension in the string? a. 6.2N
b.12.3N , F _
13.5” 3,; f
64.?” 1'
enmeoftmse
Z 13 'J
'93:?“ L:
__ _b —rL1.:;1
fl+F97 ”“3
T1: MS'FED
T: (Itall‘lﬁl’ [gﬂvj
T 252.? ?.Aotatainhangssnafgrtdowninfrontofmopenwindm. Amdengmtofwind
Homepasttheuﬂndomarﬂtheomtainispuledoutofthewindow. Whiohlaw.
principle, orequation can be used to explain this movementofthe curtain? a. Pascal's Principle.
ulli's Equation.
Archimedes' Pﬁnoipte.
d. Poiseuille'e Law.
e. the Wait)! equation. 3.Theeoundievelofahammerat2mi590db. Whatiethesmlevelatapoint
40mawayfromthesouroe? 9: :2 o?6dB ..
. _g;l_l
[5.3de N main“ r.
e.noneoftheoe 1 __.:P;[1:E1r " I,
1 ' .__":"_,'
r . .»
 
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4")
:r ‘ ‘
£1.13.
r .p‘i' 1
_. 'rﬂ ”ﬁrm
.r—
'1 3““. 1“
.1. I =3!" 1
He ;"_
a 'I_..fl,:_.1~.,ilro 9.5upposeyoua'emvingingmaswing. mmﬁmtofywastaﬁmaly
whistloishlowing. Whereinthomotionoftheswingmuywhearthehighest
pitch? @at the bottom of your on: when moving forward.
' . at the bottom of your art: when moving backward.
ﬂat the top of your are when moving forward.
d.atthetopofyowarouhen moving W.
2. mm of these 10.Apipehasresonantfreqwldesat126md162Hz. Hmkmgisthepipe? @4.?6m
13.5.36rn
o.6.13m
d. 115 m
o. mofﬁ'bese ...
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 Fall '05
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