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# exam2ans - KEY PhYSics 111 Exam#2 Fall 2001 Name:” Show...

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Unformatted text preview: - KEY PhYSics 111, Exam #2 Fall 2001 Name:” Show your work! - l. A 60-kg pole vaulter running at 10 m/s vaults over the bar. Her speed when she is over the bar is 0.8 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar. Altitude = 5-1m Hednm'ca! E (s preserved. mama. U1= 'Om/s. Una-8W3 \ h=71 “\$7451: 3%sz +vy/3h ‘ r é'f gee-5‘9 EL ‘00); = at ~ (0.8); 49%)}: C/ 130: 0.32 +01% “.hx5-lm 2. A/EETE;§;9bject (Object A) moving to the right a ‘:EEZ§“6’f#takes and collides elastically with a . object (Object B) moving in the same direction a 6575' Find the velocity of each object after the collision, assuming all motion is along the same line. Object A velocity H.LLCm{s Object B velocity EGJ+CMZS 35.03 {0.03 ®~——->' 20. Gem/g -00cm/3 XE PMGWE’dé ”M «r Um: = What" + U35: UH; -'Ue§ : Uez‘ 41hr? = "5.00 —eo‘o = -190 may: vhf—15.0 P Mew“ % Wigwai + mgh‘ai : annf +Vﬁ9'U‘Bj: i} (ES‘ONBO-OMUOOMB-OO) = (Bee-We; + 00.0%; ,1” C/ ’550 a 85.0%; + :00ng 4’ ,r' :3 HO : ROGUE)? + 3.00%} 1-7 no” :1-5’ '. llo = S 00(VBf - (gm-+6.00%} 0.007163: :85 ,— VB? 5% €8.4- lfﬁé—‘t H.14- _‘_‘_‘ __‘__k 3. A white .. is painted on the rim of a bicycle wheel of radius The tire is rotated on an axle startin from eSt with steady an ular acceleration. Durind (f— "M‘rﬂj. the tire rotatesqﬁﬁgs, -before reaching a final ﬁg angular speed. '3 40min = 80n- vad "" a. What is the average angular acceleration of the wheel? _ _ l - W - I ,_ Y... 0 5 : , CLILl-Omro‘oVa:l t lease m 3 at + 1 9 w Zdt‘ :- — - '60”? a" 801]” : O 4* 72d (60) " 0“ 609' [[5 b. What is the angular speed_of the wheel after 1.00 a 0_ lLI-OVDd/s min? c. What is the speed of the dot after 1.00 min? ”9|qu Ut=Yw :[O-Sm)(8.38movs} =3 LHq d. What is the tangential acceleration of the dot during the 1.00 min? 6.98»: no"? M/52 at: m— ~ (0 5m) 3; 2: 0,06an 4. A @rock is swung in acvert-iﬂlye of radius .50 m‘ such that the mechanical energy of the rock is [.7 constant. If the sgeedhatk‘the bottom of the swing is find the tension 1:17:53 string at the bottom and to? the top of the rock's circular path. t : 3 'WF \\ 3:!3500011? Tension at bottom E.|5Y{O l‘idir HE {1! . \} UM : ””0 ”/3 Tension at top a 014- XIOBHdir_ down .. F Tb " Mach. E Presewed " .1 150;? 7:; -71. +wt 571:1}:th T W %V{U;P * %3(3 (Br) ' iﬁvbotl beﬁnom- Ft: Tb- wt .—_ mﬂtmta. \_ 7_Tb='Fc+wl; =m(U—EPH%) y a [at _ a r - wt ‘1‘? (2 3 ) ‘ m?“ *% :ans. 3, : Um - 13v Us? a». 5C1 .3m :@[email protected]; 3% J 5. If the elastic limit of steel is .leo3 Pasca , determine the minimum diameter a steel ere can have it if is to support a-circus performe ' out its ._._ elasticﬂlimitmlieinl exceeded; (Ystee; 20x10“ 3? “antenna, Minimum dia = LEW 10‘3”. Elastic ' modulus -- d V386” =2’f' \f: F/pl. :FLO P335...- \-F:'m% f: (BL/Lo EAL. ’st ' 5 (Moe : £733.11 T l ‘0 Tit-z] tox 0 . a- 4-(no)(°1-6) , —3 .. d ~— (QOVIOSNT .-dx|.3¥i0 6. The planet Zorgo, in a galaxy far away, has thesame_\ gravitational acceleration at its sunface that Earth (3:15 does, but has a completely different atmosphere. You are going to determine the density of the atmosphere. You t ke a @balloon (when empty) and fill it with @pm, = 0.179 kg/ma) to a radius onZ.50 meters) and fasten it to the ground w h a rope. You measure What is the the will the ro_ at (800 in of the atmosphere? Luffk B . I balloon P B = wt+T = (3 00m ‘3) + (asylum + 800” 2:, ﬁlm-H also. [3 : Vballoon 7 P8 ”9:333“: 3,91 Link/m3 VolumE'—Vhalbon = %N( 3.50)3 : 65145 ngolboh I (3‘ Extra Credit: A-thi‘c}< bar of soap is floating on a m: mQSSoFsmpwater s'Lirface so that @013 the bar is underwater. V‘UoiumeaF Bath oil of specific gravity- is poured into the water Shop and floats on top of the water. What is the depth of the Ps=olensilry09 oil layer when the top of the soap is just level with the Son? upper surface of the oil? Q3 B1=wt' :PW8G1—55 ) L35cm 5‘9 __ H0 mg: 23F Wﬁvm é" \$a€i9m§ "I‘ I 7. a a. —— ”h. _ 3 3 l -sooh-n§t :9“an Wm) WM 2.01-erth —> 6wx%+*m(I—%‘a :qxlooo awﬁmii‘if’mﬂm ...
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