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Unformatted text preview: Name: EY PHY317K
November 1, 2007 Signature: Exam 2 Unique number 61945 Instructions: 0 No notes. textbooks. or similar aids are permitted. (You may use a
calculator.) 0 Use the scantron answer sheet to provide the answers. Bubble in your name
(last, ﬁrst) and UTEID. Write your name (last, ﬁrst), UTEID, course
name, unique number. Sign and date it. Mark answers for all problems.
Mark your answer sheet using #2 pencil. Mark only one answer per problem.
If you need another scantron, ask the instructor. 0 There are 16 problems on the exam. Each problem is worth 100/16 = 6.25
points. An incorrectly answered problem is worth 0 points. 0 You must complete this exam during the class period. c Any questions you may have about the test have to be directed to the
instructor or a TA. No conversations and/or collaborative work are permitted. 0 You may use the blank sides ofthe handout for notes and calculations. 0 Some equations and other information that may be useful on this exam are
provided on the last sheet of the handout. You may not ask questions about it.
You may detach it from the exam, but will have to return it with the rest of the
exam handout at the end of the exam.  2
0 On this exam you may always assume 3 = 10 mfs . 0 Sign the exam handouts and return them with the scantron form. C 1. A weightless strut is hinged to a wall and is used to support a block, as shown. A 3 m
cable. which is horizontal. is attached to the wall and to the end of the strut, as shown.
The hinge is frictionless and does not exert any torque on the strut. lfthe tension Tin
the cable is equal to 900 N. what is the weight W ofthe block? 3m T 4m ~" 7? A) 900N TJ’C’M‘
B 0N 
GB) i380}; Net {0.3% cQoaocLL “My" klpci‘wlt—F?\ M‘sh. can‘tAA
D) 1400N
E) lSOON =3 0 '2 (‘dwAT— BMW/Q
_ = i
.3 \Al 3 T N:\‘2_DO’\J . A spherical shell has inner radius R], outer radius R2, and mass Mdistributed uniformly
throughout the shell. The magnitude ot‘the gravitational force exerted on the shell by a
point particle of mass m which is located outside the shell a distance d from the center
(i.e., d > R3) is:
A) 0
B) GMm/Rf Q GMm/dz
GMm /( Rf — d3 ) E) GMm/(R. — (1)2 5w.“ W ‘m—er‘s w: Mugs ec.\\
mass is MWWQM ox. \K—A WW :5 tr: Q12"
AL rg 3. A uniform meter stick has mass 600 g. The meter stick has markings spaced 1 cm apart,
from 0 to 100 cm. The meter stick can be balanced by a weight of mass 400 g placed at
the lOOcm mark ifa fulcrum (i.e.. balance point) is placed at the point marked: A) 80 cm 0a“. x 5.0 ”L we m
CE? 70 cm
60 Cm 4 foamJ“, L
D) 50cm ’L in LM N 44mm F: :53¥i‘k\°ﬂfs)
E) none of these “3'9 NC‘E ﬁr)“ MUStb‘t W“
EULlwutL thr LouL m
duh—L L .p...lu‘u 3 (1010),; :QDOH) 253.220 :5) MMLTS “t
=> (Cam13L: (4~)(ro—x.3 x+ro;,.: q—oLM 19> Ozxmg—(§0&\F A 4. At time t = 0 a particle of mass 3.0 kg has a velocity of ‘3, =(5'3 m/s)f + (4 m"s)j. At I = 3 sits velocity is G, = (—5 m/s)f. During this time interval, the net work done on the particle was: \Al =AV—7Vp ~L‘. “GI. mar«M? 44440—31
@ ZCTO J“ b 1172:5345
B) —42 J 2 ng;1_%Mv.iz ' :r
C) 8] 17:0 snug l
D) 25 J A = mev/mfa V,”
E) (6 J)f+(—8 J)j "r ' ‘ +
\le =0 @ S. A particle ofmass 5.0 kg moves to the right with velocity 4.0 m/s, as shown. The
magnitude of its angular momentum about the point P is: 4 mls
5 k9 .———> 
F ‘ ‘
\x \
\\ 30°
\‘\
\t
10 m. \\\ x
\\ 'P
a \ 99 = 3°”
A zero L ﬁr it? (ﬂow.
élOOkgmzls =‘7 L2r175w$9 “=5”?
) 50 kgmzi’s =rmv‘5L“7P V : qﬂb
D) 200 kg  mZ/s
E) 20 kg 1112/5 : (\DWXiylcaXLdivlsls‘m 50" L : /00 Keg “ML/S 6. A wheel,with rotational inertia 1, mounted on a vertical shaft with negligible rotational ' E inertia. is rotating with angular speed am A second wheel with rotational inenia 31 is
initially not rotating, but is then dropped onto the same shaft, as shown. lfno external
torque is applied, the resultant combination ofthe two wheels and shaft will rotate with what angular Speed?
3 I
“23/
© l l I.
U
Li'k emstruLd
A) COO/2 ND ryeL BK'LL'WGl {onMf—D» CLI:Lf3
B) 2600
C) can/3 L; =—T°°o L;=_I'.r~=&_+ 31w; D 3600 .__
@W ”a z» leaﬂztxﬁ =w we ever.
:» (AR’:LJDo/4 C, 7. A wheel has an initial angular velocity of 8.0 rad/s, but it is slowing at a rate of2.0
rad/s3. By the time it stops it will have turned through an angular displacement of:
A) Brad ’6.“ 9.: 0 mo: Bond/s ecu2.0 mat/gr.
13) 32 Tad what st—n‘eﬁ yew.“ out'ld‘MD gigs: www 3.0 PM”:
—. 9'30 =
E) 48 rad =5 t 1 —r"' T " ?.Or.d/1"3 4.5 S05) : 9;; "VbJot +£Atz
:5 804$ ; (9.0rhd[§\ (As) + i(iﬁmd/st) (4.Os\2'z jbf‘LCl \ 8. Cart A; with a mass of 8.0 kg, travels on a frictionless horizontal air track at 3.0 m/s and
3 hits cart B which has a mass of 12 kg and is initially at rest. After the collision the center of mass ofthe two cart system has a speed of: ____
A) zero /V9 rut 9;le {ﬂan.1; 51> VW : V; GM
B) 0.5 m/s .
C 1.0 m/s v; W : (8033L10w/s warms,
1.2 m/s ' 8.0 + 12.
E) 2.0 m/s 5* "t zobg. 9. A solid uniform sphere and a uniform spherical shell of equal mass and radius are
® simultaneously released from rest on the same inclined plane. Both roll without slipping
down the incline. Then:
A) the shell reaches the bottom ﬁrst because it has the greater rotational inertia
® the solid sphere reaches the bottom ﬁrst because it has the smaller rotational inertia
‘) they reach the bottom together because they have the same rotational inertia
D) they reach the bottom together because they have the same kinetic energy E none ofthe above is true
) ﬁfauhi on \patk Duet ejwl (Ftsolid :rtsluu\ Inhalt " 19M.“ 1...
H) Isdic‘ "is“*5 : ism.“ "an“ S 5 5a\‘:c\ ”Lat“; 5.4km.
K I . ‘5 : _ __—" ._ .
“H. and cm.“ ) °4¢\.=\ >d~suu *tﬁ’ﬁ. aquL 1;th 41‘ “ C 10. A constant force of magnitude 20 N is the only force acting on an object of mass 1.0 kg
that starts initially from rest. At the instant the object has moved 10 m_._ the instantaneous
rate at which the force is doing work is: A) 5W F210N=wst =\4’Q.‘—‘:'_/m =wst: 243—151. B) 20W M'‘\\‘—} ‘=‘) ctr(EX: ﬁkmtzmt C) 400W 1"” ma: n*m“i:a~+—“‘:«e1
) IOOOW Xu=0 E) 2000W xxx—325.0.» :15 +_: LuciJ O.
3 U‘CT): oCia 22,06 ’t’LL ban—mo LLe. HH ‘1‘“ “'inth 4"” S‘oﬂt 0 ;5 «$0ng work—3 T‘ ‘3‘M “‘5 :m ’?(T\: F¢LT\=(20~\(2(wls‘)i\°w\ ::_ 400W
A l l. The rotational inertia ofa solid uniform sphere of radius R and mass M about an axis
through its center is (2/5)MR2. A massless string, oflength R, is attached to such a
Sphere at its surface and used to suspend the sphere from the ceiling, as shOWn. The
rotational inertia ofthe sphere about the point of attachment to the ceiling is: 902/5th2 ) (7/5);er2
C) 16MR2
D) (cu/sum?2
E) (125le2 TD 12. A block of 4.0 kg slides along a horizontal frictionless surface with velocity 5 m/s. It is brought to rest by compressing a very long spring of spring constant 100 N/m. The maximum spring compression is:
A) room when mm WMVM’M “CNS 0“ ‘4 “A 5m“ B) 20 cm lL'I'VtL‘rJL emerges Mm Gyms ‘wtn tw powered awnr35
C) 50cm 0‘ tMt 5‘?“l““§3 (D))100cn1 M24¢3J v3: gMIs, bk: [cow/w:
200cm ﬁrm I
/z./MUTL72’4 “1:.“ :3 x"“’" 2 :72" U: ~ 41.: '
_/ (1' (S—Ml‘) [DUN/M XM", : lM: {ODLM ”V; 13. A ball of mass 2.0 kg is initially moving horizontally with constant velocity of2.0 m/s.
it strikes a wall and then rebounds from the wall with horizontal velocity of 1.5 m/s in the opposite direction. The change in the momentum of the ball is: A) zero ’3 . X T h; j 2 w‘ v”
7.0 N  s away from wall ! \V M3 :M h 4“ ”$5 \
/ A. . W m.\ C) 7.0 N  3 toward wall D) 1.0 N  s away from wall \" =' (2' ° “QC" 2 can/.0
E) 1.0 N . 5 toward wall " ’— 4%? vaseM. :5 an“: Q‘rm hm“
Nabz h: (2.01ca\W$_mis)
/ . \aublﬂ‘lr
N5:(::_t__)5 _ gJD ka'M/S shamwuﬁ S‘rcMuun‘
= regMl: AV: Va“? / =(3.0 kg'v‘isb— (* 4.0lcﬁ'vH/s\= 4.01%.,“15 C 14. Block A, with a mass of5 kg, is moving with a speed of l .0 m/s. Block B, with a mass
of 10 kg, is moving in the opposite direction with a speed of 3 m/s. The center of mass
ofthe two blocksystem is moving with approximate speed: A) 2.3 m/s in the same direction A is moving MA = Yb} 1);. i I. Ovals
B) 2.3 m/s in the same direction B is moving _ @ 1.67 m/s in the same direction B is moving M“ '10 b} U”rt. = " SMI“
D) 1.5 m/s in the same direction B is moving u; E) 5.0 m/s in the same direction A is moving “3
___~5 .1 \luM : EX L‘Jﬂr’rwt't la UE‘MnB
A l 13 l >1 ‘ 2‘ J.— CZS'J: ”en/$3
{51:}. 3 AWLCCTOM r? B \/¢M:P§fM/$ / __":_nI.G4wn/S p 15. A block ofmass 5.0 kg is released from rest 100 m above the ground. Ignoring air
resistance, when it has fallen 40 m, its kinetic energy is approximately: A) 4.000] Emu33 F5 Wmvgd 5;) AV. 2 _ ALX .
B) 400.] h .. Mt“: 1:?“ l
C) 200] AL\:M%A\A rm Ax. :wtw n
® 2000] (tuned. {EWM — ‘40 H ‘V'n‘ "‘3,
E) 50‘” :3 "‘“l’r =0 :3 AL: V.
AV“ 1 “Mabk ° 5". _ Lo
_ J— 1_ mVaL
’Z'F' = CS.DL33(10*~/s‘)(—4OM3 ‘ LMVP/
: .1— vI.
[Z T: 2. DO 0 I 2— M f
74 , AL 3 tit 16. An object, which is initially not moving, is released a distance d from the center of the
Earth . If M is the mass of Earth, R the radius of the Earth, and d : 4R, the speed of the
object at the instant it hits Earth‘s surface is: ‘J/ m“ °3r alt‘y—rt A) JGM/3R u=_ 1 Tim ninth“;
B) 2JGM/3R r gr; 9;
© J3GM/2R ‘U'. :0
D) ‘lGM/Rz Eﬂﬁrjj mervLiu E) JGM/zre2 :5 Al’— ‘ A m;
: ZCAH ( “L _ ___l.._.
9 4?» ll "U; : '2/ 361M /2_,[7_ ...
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 Spring '07
 KOPP
 Physics

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