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Unformatted text preview: EXAM 3: Rotation, Inertia, 5: Simple Harmonic Motion Physics 130A
Fall, 2004 ALL numbers are good to 3 significant ﬁgures. Answers may.r be rounded to 2
significant figures. Use a number 2 pencil for the ParSCURE form and avoid erasure. If you smudge
the answer form. switch to another one. Put your ParsCURE form behind this page when the test is finished. ClotIE: (c‘x
Name  Please Print You must hand in this form with
the ParSCORE form 01: no credit. 1. A spinning ice skater of mass M grabs a motionless mass of MK100 with one
hand. Compared to the initial anguiar momentum of the skater alone, the angular
momentum of the skater and mass combination is a. decreased by more than 1% in. decreased by 1%
ETHnﬁtanged :1. increased by 1% e. increased by more than 1% 2. A 400 N weight is hung from the end of a wire of cross sectional area 0.010
cmz. The wire stretches from it's original length of 2000.00 cm to 200.00 cm.
What is the stress on the wire? (100 crn : 1 meter) 3. 2.0 X103 Nr‘m2 r r ' TD'“
b.3.i.'i:i:10it WmE L —_ 'Zw
($4.0 x 108 mm? d. 5.0 x105 WmZ e. none of these .— 3. Aspr‘mgisstretdledacistmﬁﬁunitsmuﬂihﬁmpaintandstma
9:1me Ifthesprimiestretdledmtil'tlustorederlergyis4ﬁm
isthenewcismﬁuntheeqihrmpoht? 3.13M
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PE ' W: 4. Ahelieepterbladestartsfrmreetand. withanmstantangulaaeceleratim.
readmanmlarspeedntﬁrewsham lfﬂuhladehasaraﬁmafﬁ
nyﬁtdﬂuemaeeeleraﬁmofapainmtbetipofﬂmuade. a. 33. ﬁlm's? _ f c a, —. Run.
b.4124 mfs i“ ;. c.5114: mfg? ~~ m Faith“
.613 255'. cw— an 16* 5. The SI units for radians are a. 57.3”
b. 211
c. kgmz d.degreeslsec
@nuneofthese 6. A solid cylinder (I  0.5 ma?) of radius 0.35 m is released from rest from a
heightoftﬂmandrdlsdmnanincﬁnetnaleveltradbelow. WhatWhatisthe
WWGftfecylindermnitreachesthetIﬂ? @103. radfs :; 3%“: 2:32”
W133 radfs LU”: _—
c.1?.6raclf5 ,:= if
d.21.4radf5__\‘r::
amofthese 'T HE_
. .. 4 ,r
!Eai r
“‘5": J— lﬂd': FLIMJI
Z 2 z E 3 ..
HF)
mzmhwmfw I
3 Z i". A pendulum consists of a mass M swinging at the end of a length of string L at
an oscillation frequencyr F. If the length of the string is increased to 4 L. what is
the new oscillation frequency? a.Ff4
@wz c.F _ F , « r:
e.4F  gist: 8. A fan rotating with an initial angular VEIDEity of 1090 rew'rnin is switched off. In 1
seconds. the angular velocity decreases to zoo reufmin. Assuming the angular
acceleration is constant, how manyr revolutions does the blade undergo during this time?
] g I ($10 '94:; “mfg
b' 20 .5:.'‘.':', rruu‘fx
c. 30 "
d. 40
e. none of these
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as? = I“ 9. A car is moving forward 1with a welcuﬁtyr V. With respect to the road. 1what is
thevelocityofapointontheedgeofatiredirecﬂyabwetheoemerofmeﬁre? a. ZV I3. V o. 0 d +V _ ' _ ;
fﬁh+ZV _ _..,.J 10. The moment of inertia of a uniform disc with an axis of rotation through its center is MREIE. The mass of the disk is 20' kg and the rains is 0.25 m. if a 2
Nm torque is applied to the initially motionless disc for 4 seconds, what is the
ﬁnal angular velocity? $12.8 radfs in” ~9 '~ "r _ _:
b.19.2radfs r“ =*"*
4:. 25.6de's __ ‘__._____T._TV_1
d.32.0radfs ‘ L '
e.noneoftheee _, _
r 1 ﬁle"
L.J '5 " ...
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 Fall '05
 Oseroff

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