103f07solns2 - Name - I ' Physics 103 Exam 1: November 1,...

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Unformatted text preview: Name - I ' Physics 103 Exam 1: November 1, 2007 . 2. A 1,200-kg automobile moving at 25 m/s has the brakes applied with a deceleration of 8.0 m/s?. How far does the car travel before it stops? . A. 47m .2 .2 V, I V.‘ raQAAK 39m ; 4 C. 72m _ D. 55m :. ' : 2; a : -9 E.- 63m \1 O / V: ’ 2:2 ) AX : : >‘7 92-5 3. Samantha pushes a 50.0-N crate up a ramp 25.0 m in length and inclined at 10.0 degrees with the horizontal. What potential energy change does the crate experience? ‘ A. 55 J t ' . B. 2801 AM: #1474314 v Mjiyo’v' C. 13 J ‘ ' 9—} ® 220 J E1201 - pflm‘ AL:;;sin/0 AM: (S’OHQZS’s/n M) . 3 220 J— 4. A Hooke‘s law spring is mounted horizontally over a frictionless surface. The spring is then compressed a distance d and is used to launch a mass m along the frictionless surface. What compression of the spring would result in the mass attaining exactly double the speed received in the above situation? A. 1.73 d ‘ \ : K I: (155.35% ' 5W”? ". '“' D. 4.00d :lwlg‘ 1 1mv E 1.41 d - dzg‘v If Va v/=2V. 4—» aka?! 5. Preston pushes a wheelbarrow weighing 500.0 N to the top of a 50.0-m ramp, inclined at 200° with the horizontal, and leaves it. Tamara accidentally bumps the wheelbarrow. It slides back down the ramp, during which an 80.0-N frictional force acts on it over the 50.0 m. What is the wheelbarrow's kinetic energy at the bottom at of the ramp? (g = 9.8 111/52) A. 6,550J _ B. 8,1501 M Z W. t m? :5’00 N C. 13,1001 1 . a ‘ a .520 fidi) 4,5501 . L. 2 >05... E 14,3001 ‘ U11— = $00 (sosmam) (01”: F a! = Z’O-SO K]; I Ml. — ILA/F] : 500505211510) - 570(50) I VS'SOJ' Name" Physics 103 Exam 1: November 1, 2007 6. Yuri, a Russian weightlifter, is able to lift 250.0 kg 2.00 m in 2.00 5. What is his power .output? I A. 9.80 kW ' ' ~B.500w P: W ._ F'Q’ ‘ Wfi'd C. 4.90kW ' ” « “ ’m D. 10.0kW 4‘5 at at _._'~. FL 2.45 kW ‘ .2 5’0 ($8) .12 7. A 75.0-kg swimmer dives horizontally off a 500.0—kg raft. The diver's speed immwiately after leaving the raft is 4.0 m/s. A micro-sensor system attached to the edge of the raft measures the time interval » during which the diver applies an impulse to the raft just prior to leaving the raft surface. If the time interval is read as 0.20 s, what is the magnitude of the average horizontal force by diver on the raft? : .L‘is’ 12w 8 l A. 1,700N . g V I “B. .525N F : 911 ‘ Fl. : 0) [01C 1 WV D. 900N .. ‘ p 1,500N I: _ WV : (mania. ' N V bf " ‘//;00- j 8.’ A machine gun is attached to a railroad flatcar that rolls with negligible friction. If the railroad car has a ' mass of 6.25 x 104 kg, h0w many bullets of mass 25 g would have to be fired at 250 m/s off the back to give'the railroad car a forward velocity of 0.5 m/s? 6 7L0Punr5/V “Mom cm {Cum 0 plfik‘L‘LV‘ : émcéwardj “I‘m/“4V” h’w“ B. 2,000 _ 0.: and; C. 3,000 D. 7,000 ‘1< ' E 400 x/O {1 (W455 of éA/(Ofb‘) (—250) ‘ ', ‘ _ /~Q5/ L: r m... at 0.02%; = My [.3 r at AMI/of: = v————~ : 5000 . , / .0451? 9. A neutron in a nuclear reactor makes an elastic head-on collision with a carbon atom initially at rest. (The mass of the carbon atom is exactly 12 times that of the neutron.) What fraction of the neutron's kinetic energy is transferred to the carbon atom? , 56.6%. A. , a 28.4‘y . _ 71.6‘y: t’\e/><7L Pfijc 5/ D. 41.4% E 14.4% we, WQV;+' 1"0 19nd 7‘41, FMLCHOA KEcF : fi’m/ L‘E 01‘ Cfiréom n+0,“ KE I [in/+1?! L65 0?” Mcufroy, M4 KE L L V 1 [44 V 0-; : A a CF _ if 145/143 [M : /2 w KEV” ‘91: my, V“? VIM A . 7C, 04 , VC‘C §0 we VI¢¢0I 7"0 ‘V’o/ — /,L ’— V \/ 1 m4 V11 _ v we . 2 A? V + V Lot/'5. 0-} mom : my, le " W‘cv F 4/ mm VHL ' V”, C1C M‘F . ~ - f or VH1; _ vyuv L2 Va; 0 Iv l 2 .1 __ 2 Q C0145. 0'; o fly)“ V“? 2: {MC V0; 1" 1 mph -—-3 VV”, ‘ +' V“; l V A I 1 ® or vm-F ’ VV'4 2 VCF I a 2 —- l a [6+ 5 Siam/c aiumL/ow @ VVHL ’ VN- “ 2 L1 V V.“ 4- /‘4"/ v64. vhf A l‘ivac Vm +/‘4L/ v61; _ v: A /l ch‘z —" ’MVE : —2ch£vl +IVL/ v4 gr— 0 I " 21/ VOL Vt“, + [5‘9 VLF; 1am» Wk v6; vc; ( Kl, v4 - AV vm> 2 0 Va; #0 $0 /5—Cv1£ ‘l‘f VM :0 WM 79v“, ‘éf : :2—‘1 v " lfé ’f’lm! “WIN” {'5‘ KEC‘F 3—: 2 Z /J‘ [Yb KE. 7H H )4 0‘2 ~12 H L) .°<’ 4 o o\ Name A H ‘ ' » Physics 103 Exam 1: November], 2007 10. A 5—kg object is moving to the right at 4 m/s and collides with another object moving to the left at 5 m/s. The objects collide and stick together. After the collision, the combined object: A'.‘ is moving to the left. ' ' B. is moving to the right. - C has the same kinetic energy that. the system had before the collision. D. is atrest. M ® has less kinetic energy than the system had before the collision. 7%; aé‘ca‘s Sf/IC’L/ 7% W?- 50'+/\e_ CQ/llsy‘oy‘ ,‘5 erfécvW «'Aa/a;%;'.( J - 5 I . /” . , 7 _ {s MoiL C0145 ervcp/ f. < K54! ‘- 1 1. A helicopter stays aloft by pushing large quantities of air downward every second. What mass of air must be pushed downward at 40.0 m/s every second to keep a 1,000.0-kg helicopter alofi? ‘ .47 (A) 245 kg . 13- szokg 7LA2, frat/I'ch lam-541%? 7"Ae/ alf- c. lZOkg ‘ , .. p D' 360kg “(owmwafé/ “WI/1‘7" &ZMA/ fzxc 7A0ffic .01L jraufl‘y E. 490kg . 1x It f , in: Mfg 1M 5 1M ‘_ 1m Maj : /'ooo(7,é>) : 3% : IV : V w V0 . a _ p I 12. A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s2. What is the time interval required for it to reach a 4.2-rad displacement after starting from rest? A. 2.0s _/ B. l.8s N’-°25 (3.165 ,1 'D.23s Aezwotfji‘Xt __,@18s I A ' V..1=0‘+ :(IOQS)'C —’ f;"?’ 13. A bucket in an old well is hoisted upward by a rope which winds up on a cylinder having a radius of 0.050 Hi. How many rev/s must the cylinder turn if the bucket is raised at a speed of 0.15 m/s? A. 3.0 rev/s ,. r I B. 0.18 rev/s 5/4¢6o{ 01L bed/Lot" 7' {VII/'7 5W7L’5v/ vo/OCr F7 0 f C. 0.24 rev/s Gym/loyal, __-’> 0.48 rev/s . E. 1.5 rev/s V " a V a /5’ rad / rcv B L” : s: l o: z 3 § < 271' ,VM’ : L/ 8’ - if): V 353A! Name" Physics 103 Exam 1:‘November l, 2007 14. What centripetal force does an 80.0-kg passenger experience when seated 12 m from the center of a Ferris wheel whose angular speed is 0.50 rad/s? ' ' ' _,7® 240 N . . B. 180 N ' _ ,2 “I _ . 4'2 C. 484N E‘ r“ V” “(5) (cool D. 720 N N E 914 N a a? V0 15. Geosynchronous satellites orbit the Earth at a distance of 42,000 km from the Earth's center. Their angular speed at this height is the same as the rotation rate of the Earth, so they appear stationary at certain locations in the sky. What is the force acting on a 1,500-kg satellite at this height? A. 514N Lorna/w WM; ' . 92 ,. a B.457N , _- Ii X3 77' > : C'. 404N Fa — M V“ — Hoop/"2000 w )(27-3000 D 85 N ,2 oi ,2 H d ’9 E. 333 N _ 77 m 71’ :1. w '- / 51a. ; 92 11~ ho a g 7 [/YO D ME ‘ > 594445 QHFWCV 70.4 M5‘C F9 2 G (71000%)z 16. Which of the following best describes the property of the period of orbital revolution for an Earth satellite? , ' ' V ‘ V _ A. determined mainly by the satellite's mass . Ufa V, 7‘ : ; ,4 greater when the orbital radius is larger [0 417' w 2 77- . independent of the orbital radius " _ D. greater when the orbital radius is smaller ‘ . ‘ ' E. none of the above :75 r Incrcqs‘e 5 / T— [Mercaras 17. A rod of. length L is pivoted about its left end and has a force F applied perpendicular to the other end. The force F is now removed and another force F' is applied at the midpoint of the rod. If F' is at an angle of 30° with respect to the rod, what is its magnitude if the resulting torque is the same as when F was applied? 1A.2F,, B4 F —’r>.© 4F ' D. 3F E. 5F L Name ‘ - Physics 103 Exam 1: November 1, 2007‘ 18. Tasha has mass 20.0 kg and wants to-use a 4.0-m board of mass 10.0 kg as a seesaw. Her friends are busy, 3 so Tasha seesaws by herself by putting the support at the system's center of gravity when she sits on one end of the board. How far is she from the support point? I ‘ a F Po 7L5. "Ff-Um A. 1.0m- MIL) ['A:U ' rags: i ZTZM?(§'X>“”3X :0 '1). 0.26m W”? L E. 2.0m 1‘47 x Ma(3—x> : m3)< . L/a I0(2f><’> : '90" 4.1. 19. A bucket of water with total mass 23 kg is attached to a rope, which in turn is wound around a 0.050-m . radius cylinder at the top of a well. The bucket is raised to the top of the well and released. The bucket is moving with a speed of 8.0 m/s upon hitting the water surface in the well. What is the .angular speed of the cylinder at this instant? ' A. 120 rad/s v S/flef’ro’ 07L éuoLe/f : fawgewfl‘fi/ 5/0660/ of by Amie!» (a) l90.rad/s . V —-——> C. 160 rad/s v 111 Z V L) D. 79 rad/s (S; S I E. d/ (F rapt m s w 1 —— : MO :7 .of 20-. A solid cylinder of mass 3.0 kg and radius 0.20 m starts from rest at the top of a ramp. inclined 15°. and rolls to the bottom without slipping. (For a cylinder 1 = 0.5MR2) The upper end of the ramp is 1.2 m higher than the lower end. Find the linear speed of the cylinder when it reaches the bottom of the ramp. (g=9.8m/sz) ‘ p 1 A. 2.4m/s -, Kg; 2 : Mv‘l ri I“: B. 4.7m/s , l ' 1. LC C. 2.2m/s Ll : :mvl+fi(gmra><k) D. 4.3m/s ~ 2C?) 4.0m/s : j. mVl L, MvZKE 4 .C _, 3 _ M Mai! ~7ymvl —" V * L1 ‘F 21. A tetherball is attached to a pole with a 2.0-m rope. It is moving in a circular path in a plane perpendicular to the pole at 0.20 rev/s. As the rope wraps around the pole it shortens. How long is the rope when the ball is moving at 5.0 m/s? g: 2 I / z ’ " ‘ \ _ ‘ ~ teaser/vat lL/(Orx o F an? Vo/Cyt” WOW-em ham ' 1’; ' rev ' VA/ .0.82m *’ L130) .W':,2_§': 027701): ' E 1.8m A ’ I m izmr n=lmjvl=5r ‘1 l 1 V4 V‘ \J : :_ :: [m V‘ LJ C m I" - : Wt L. m V4 4% L; r L c 13 t t 6 . 2 l _ __7 r ~ V; w« / .z f V _ f— I 50 V4 (A)! p 1C 1: v W1 ...
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This note was uploaded on 12/23/2011 for the course PHYSICS 2130 taught by Professor Zhixianzhou, during the Fall '09 term at Wayne State University.

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103f07solns2 - Name - I ' Physics 103 Exam 1: November 1,...

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