Exam 3 - EXAM 3 Rotation Inertia 5 Simple Harmonic Motion...

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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 Pars-CURE form behind this page when the test is finished. Clot-IE: (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% ETHn-fitanged :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 @wz .C-'-.D €9.20 1 :40 PF" "t“ . 1 L. :E 9 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. kg-mz 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 rfll‘i’f‘c- 2:6 £95.; (0 '3 [33.3 1. 660 t. 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 N-m 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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