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Unformatted text preview: Name: Student ID# ID CODE: C Section # TA Name_________________ ___________________ . Fill in your name, student ID # (not your social security #), and section # (under ABC of special codes) on the
Scantron sheet. Be sure to ﬁll in the letter for the ID code on the upper right of this page for the ﬁrst question. This
determines which version of the test you took, and it is very important to get this correct. Make sure your exam has questions 2—21 and 7 total pages.
Physics 103 Exam 3 A ' November 29, 2007 Multiple Choice
Circle the letter of the choice that best completes the statement or answers the question and also mark this answer ‘ on your Scantron sheet. You must do both. . Possibly useful numbers: Density of Water: 1.00 x 103 kg/m3 B_
latm = 1.013 x 105 N/m2 1 u = 1.66 x1047 kg Please be very careful with the ﬁrst question: 1 . ENTER THE ID CODE ABOVE IN THE UPPER RIGHT CORNER A. ID Code A
B. ID Code B
C. ID Code C
D. ID Code D
E . ID Code E Name: Physics 103 Exam 3: November 29, 2007 2 . A rod is 2.40 m long and has a diameter of 2.50 mm. A force of 2000.0 N is applied to the end .to
stretch the rod by 1.40 mm. What is the Young’s modulus for this rod? ‘ I A. 4.90x1011N/m2 Y” ’ F) Lo
e63) 6.?9x1011N/mf 5 \A LBL
' C. 5.54x1011me"
D‘. 4.02x 1011N/m2 ' good M Q , L4 M
11 2 : H____.____._._,_ .__,._
E. 6.05X10 N/m (W(,oaa§)l> ,OOIVM
,1 t . .
:é,9§~f‘—/ >< /O”H_’\ia
m 3 . A submarine is at a depth of 500.0 m under the water. The force on a circular hatch of 1.00 m in
diameter due to the seawater (density = 1,025 kg/m3) pressure from outside the submarine is
' resume, (2 ijﬂf’lin 01C 5000 m I F : af 1. ﬂj h
6 f’ m . , Q
A' 2.45x10 N : lD/nga' (/Oa§)(73)(§00§ B. 5.50 x 105N
C. 6.34 X IOGN ,lﬂsr‘plg/ +i’7t 514/9} P : '91;ko ——‘> D 3.95x106N . .. , ~, _
CE) 494x105N 5'0 7710 frtﬁsurz/ d/H—ar‘ahco [S 5.5,. 7703“ (27% _/7A lack/i" :3 ‘“ FZﬂiA'A 4 . A hydraulic lift has a small piston with a diameter 5.0 cm piston and the large piston with a diameter of
25 cm. What force must be applied on the small piston in order to lift a car on the large piston that weighs 13,000 N?  /\
g). 5200N A /\ .2 I A,
,9 c. 520N i 2 p . ‘
D. 2600N i7 ( if? V \
E. 260N F; : (/3 OOO N> u : >,'72© {\l «Hi—>5 5 . A ball with a diameter of 20.00 cm is placed in water with 75.00% of its volume out of the water. The
buoyant force of the water on the ball is A. 14.75N B : m . : wag. M
4?!
b... 10.26N \
c. 16.67N ‘ p _
D.‘12.56N M : \/ whom V ,5 WWW W
E. 13.60N LI ﬂm, Suéwérjéd POM 01L ball L :mw>w>ew3> (9.0,. 0% 7......» . _. . .6
*>(< Ho‘f’L +Wi’ P017“ +/)31’\ ’ £— ﬁll/(7,5 [:5 (1,0_l X/O /\/ 50 VA: Name: Physics 103 Exam 3: November 29, 2007 6 . An incompressible ﬂuid is ﬂowing through a horizontal pipe with a constriction. The velocity of the ﬂuid in the wide section of the pipe is 6.00 m/s and the velocity of the ﬂuid in the narrow section of
pipe is 8.00 m/s. The pressure of the ﬂuid in the wide section is 250.0 kPa. What is the pressure in the narrow section of the pipe (density of the ﬂuid is 1000.0 kg/m3)? .1. 183kPa , BMW/(1"; azmwmz q B. 298kPa ,2 , + L A
9. 285 kPa FWI‘p/Cdf h/ wde/ v narrow R/V/larfow
h>@ 236kPa
E. 268kPa , ,
. 2S0 ></03 + :(mooﬂg) 2 : fig/[Ow + ’[j(/OOO)(£).Z
P =.—: 23¢ X/O; F4 : age 161‘; ﬂ 63> 1.93 x 10‘4.m3/s Wat/VD W . A small hole is cut in the bottom of a water storage tank. The initial depth of the water is 12.00 m. If the
> diameter of the small hole in the bottom of the tank is 4.00 m, then what is the ﬂow rate of the water . ., ﬂ
leavmgthetank. : gammy/qu eiwh'om .1 A. 1.05x10'4m3/S ”7.1M ””””” f . B. 2.53x104m3/s {W 'K ”I” ‘ 5+”. +£30me C. 2.65x10'4m3/s \. . J‘ {Mfg/V ﬂow»)?
.  ”“6““ . _ 2 D. 1.36x104m3/s &, [mew )jm + Nov W 3 1mm /; pub g trnOI/oAEV/c )fes'sot/e/ 3 R 50 £303) 2 j/OV ’“> 02/53:; ‘V 140.,“ rap/"e, :— V A :W‘ 3] ~79wo‘3>2 : [3] X/D ’53.? . A copper plate has a hole with a diameter of 2. 507 cm. A copper shaft with a diameter of 2. 501 cm is to be inserted into the hole. If the linear coefﬁcient of thermal expansion for copper is 17. 0 x 10 5 / °C,
then what is the decrease in temperature the copper shaft has to be subjected to in order to allow the
shaft to just ﬁt inside the hole? A 30.1°C Lalo/06" 5AA117’ mmf‘l" JCCWCQJ¢ Pow/[us
B. 333°C
———=r Cc; 235°C 571(100/3cm
D 395°C FL ‘
E 264°C [31’ : ,_ 3‘ ('00! cm)
i J.
i Q ,‘ .2 so; 5
AL — “L9 4’) / Lo ’5 0V/ﬁrna/ rad [/3 ( >141 Name: Physics 103 Exam 3: November 29, 2007 9 . An ideal gas at a temperature of 390°C has a pressure of 2.00 atmospheres and a volume of 2.10 liters.
What is the temperature if the pressure is halved and the volume is tripled? A. 175°C f: V. 1 V' K To Ara/2C H... rah‘o
B. 204°C c. 188° PVm/ﬁ'r )3? _ .7
Pﬁ®195°c p "L 4 W M ° 0 __/; \ . __
E 1550 E7217; , 03% 493 3% ya 719 so I1C ; I; : :(S‘u 175):L{é?‘K‘—a /¢75“C'
1 0. What is the root mean squared velocity of the nitrogen molecules in one mole of an ideal gas at a
pressure of 1.50 atmOSpheres and a temperature of 200°C (N2228u)? H A 425m/S 3‘33 T W 5 W455 of / mo/CCw/C/ of," jaj
\/ . '= .
B. 3lOm/S fw} 'l/l/l w 25/
a (Q 511m/s . ~ I»! 5
_ 7 p D. 525m/s :725/(/.é~£,></0 ) 123
E 367m/S 7 _23 kﬁw'z O . ‘ [06: //?57></0 a 7': £0656133l< K s .
50 erg = 5’ ll {g— 1 1 . A 100 g glass container is at 10. 0°C. 200 g of water at 90. 0°C is added to the glass container. What is
the ﬁnal temperature of the water and the glass 1n °C (speciﬁc heat of water: 1 .00 cal/g °C, speciﬁc heat of glass =.200 cal/gm °C)? ~ A' 75'0 ) GIMD I Z / QWVLOF 7;}6; < 7:5 4 IW“ 7‘5"
B . 46.9 91955 WQW V .— T.—
C. 68.2 I (E  homer) ( : Twa far ‘— 7C . 50.2 .
aé 82.7 I My...» C57... (7} ’ EMU : [mu/m, Cambjﬁ 7:27.32” .(l00)(.23(T1L"’/0): (200></)<6O—7—4) A «Q 3312.7 12. The heat of fusion for lead at 327.0°C is 22.9 kJ/kg and the speciﬁc heat of'lead is 0.130 kJ/kg° °C.
What is the energy needed to melt 100.0 grams of lead starting at 000°C? A. 4.23kJ : . .2 +
B. 7.76k Q m; A‘ m L
c. 3.56kJ 7‘
702k] .
(3917,03
%. 6.54kJ ‘
Q :./00[ /3<5J\7 ”DB 4— 212 7]: (7 7% ET
7‘
/‘/‘ [Cj Name: Physics 103 Exam 3: November 29, 2007 l 3 . i A brass rod is placed between two temperature sources so that heat can ﬂow between them. one
temperature is 80.0°C and the other temperature is 200°C. The length of the rod is 50.0 cm and the
cross sectional area is 15.0 cmz. If the coefﬁcient of thermal conduction for brass is 100.0 W/m °C, then what is the heat ﬂow between the hot temperature and the cold temperature? . f 19,4st
A. 9.4W .. {low ; “16/: .
a &2W’ A”* £ ”5 g L
cr75wr
4—4)? 18W .. (/00)</5;)(5/0~2~o) . 12w  . ’00 3 /X L/ . 50 (7:; 1 4. A Styrofoam cooler has a surface area of 2,700 cm2 and a wall thickness of 3.0 cm. Styrofoam has a
‘ coefﬁcient of thermal conductivity of 0.01 W/m C. A 2.0 kg block of ice is placed inside the cooler that
has a temperature inside of 2.0°C. If the heat of fusion for ice is 333.7 kJ/kg and the temperature . . o _ . 9 ___
outSide is 35.0 C, then how long w111the we last. . , 144 a I 5 P
.l/‘zm‘ ' Flaw 1411/0961. coniﬁwnar . L
A.‘ 24 hours ., _ 35 2 >
a. 62hours : .ol'  .1700 ‘ ,—
C. 42 hours F ( )< ”>09“ ( . 03
D. 55 hours ‘ ‘ J _
 . —~ A i:
E. 74 hours hf” Aw+ Q 10 . 3 I I L
7L0 nag/l7“ /'CC I QZ<333,7 X/o 1:5)(2L33 : m
59 Fét 3'WL “=2 Afz2'2177/‘7’5 _; (a; ADM/5 l 5 . A wood burning stove in a cabin in the woods has a surface area of 0.100 m2. If the stove radiates heat
like a perfect blackbody radiator with a temperature of 150.0°C, then what is the energy per second that the stoves radiates? _.L4
A09 182W 10 : 5A0}
B. 212W
3 2:33: M... W...
E. 432W , '37 , ‘1
P:(5.é7>‘/O )(./)(/)(/50+273)
i
ii
mJK”
Z /72 LJ Name: ' Physics 103 Exam 3: November 29, 2007 1 6 . One mole of an ideal gas undergoes an isobaric process from point a to point b in the ﬁgure. P1, = 3.00
atms, P2 = 1.00 atm, V1: 7.00 liters, and V2 = 21.0 liters. What is the work done by or on thesystem? P a a [o ,\S /‘50 bar/IQ Vv‘mﬁm'hg/e, 0F Worlo 40V 1'51; Lav/c frvccss X: l/ 3 P 5V
A. 1,850J _ m,
B. 5,720] w:[3a¢mx/0,32;)(;/_7 L)(,ooI_L;—>
C. 6,230] ,
D. 3,030 /
,[email protected] 4,260] : taco J 1 7 . Suppose that in the PV diagram for an ideal gas shown in the ﬁgure for problem 16, P1 = 4.00 atms, V1 =
1.00 liter, T1 = 200.0 K, P2 = 1.00 atm, V2 = 4.00 liters, and T2 = 800.0 K. What is the heat gained or lost by the gas in the isovolumetric process from point b to point c? 3 :1'34’084600]J la 2’ C. [5 1‘50 Volga/rug, [GrOCCSS
4? 318822002 Q : ”‘ (Ev A T, ”W“ ’ CV : i K
E: +3:040J 7L 7: ,G/C / _ /4 , m 2 *7 V1
. A Van» I '4 as W‘ ‘ .
(jcP'lv ' ? E 7;
50 Q: (éﬁﬂiﬂﬁﬁ '71) :, ~ /820 3“, 1 8 . An engine goes through a cyclic process. During the cyclic process the engine takes in 3200 J of heat
and has a heat output of 2400 J. What is the efﬁciency of the engine? A. 52% . w Q
a .f ._ ,_ C
B. 10% c ~ Q — l _,
c. 40% H 0,.
D. 15%
a—a”. 25%
LE) 0 QC :. 2900 7
QM : 3200 T Name: , Physics 103 Exam 3: November 29, 2007 1 9. A refrigerator uses 40.0 J of work to extract 90.0 J from a heat reservoir at 0. 00°C. What 1s the
coefﬁcient of performance for the refrigerator? ' A. 1.85 QC
‘B 2.85 C010 (VF/fw‘ﬁerafor) b:
c. 1.50 _ . _
/<\3® 2.25 _ ; <70 f 90
1342/05 ' QC , eCoF — .7; 2.5x?
L1 1 L10 j 3’; o 2 0. An engine takes 1n energy from a 500.0 K thermal source. If the engine discharges 120231 energy into
a thermal reservoir at 200.0 K, then what 1s the maximum amount of work one can get out of this engine?
[AC/4+ onji‘k‘e/(v L W V QH—
A. 350] T
. . C3?
2 2:2; M _. .3  g;
D. 267J ' T .
*  #
”=7. 480] 50 QH _ ? QC 9 t1: Q:<%
. C/
_*V:UQO)<:’:§" : £71530 3’
21. When 1.000 kg oflce melts, 33 .00 x 104 J/kg of heat are needed. What 15 the entropy change 1n the
melting process?
" 9 S :: Q.
2§>1227HK ,‘Cg/ Vino/7L5 Q 0Q: Q73l< / A . T
. 1,684J/K Q
C. 758.0J/K . g:
D. 1,967J/K 435 : 27}  ’2 7 LC
E. 2,316J/K ...
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