phys218-spring-2010-exam-final-practice-with-solution

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Unformatted text preview: PHYS 218, Final Exam T? m 3. 2 Moment of Inertia for Some Common Obiocts“ I=mR3 Solid sphere I = §mR3 Spherical shell 1 = §mR2 Rod pivoted at one end I=§mL2 OBJECT Rod pivoted at center I=fimL2 Pulleyfcylinderfdim I: émRz Wheel or hollow cylinder I = ImERiu + Rim} :_ I 3 Solid square plate with axis perpendicular to plate 0— I: :1an |_ ‘In each case, at is the aural mass of the obiece Name: ______._._.... \DUL& Density of water, pm = 1000 kg/m3 Acceleration due to gravity, Igl = 9.8 m/s2 Ear—1am SIMPE Anne. (Last) (First) (Middle) 1. Record "10” as your two-digit exam vereion number on the scantron form in the field “TEST/QUIZ NUMBER” . 2. Write your name here and on the scantron form. 3. Record your PUID number in the “STUDENT IDENTIFICATION NUMBER” field on your scantron form. 4. A numeric answer that is correct to within 1% error is considered correct. In the case that the question asks you to “estimate”, the answer needn’t be so precise. 5. When you hand in your scantron, please tear off this page and hand it in as well. Good luck! 1. A car is moving along the horizontal direction toward the right. The driver takes his foot off the accelerator and coasts to a stop. Which of the following could be the free body diagram on the car as the car is coasting to a. stop. + C, (e) None of the above. (13) Thu thrft o‘fl’kk {”1" M I‘D" ll 90¢me Lf‘fl +L CM— -i=., «1* ‘5 11“” tins “Ea OW; ii", f-‘L‘rb-élfirr— 17? “Aiken-s . 7&\ ‘13 Was-Tit lax-2., ‘lL, swiW‘H-JQ, £0ch out), ‘ila WMVL ‘QWL 2. Two billiard balls of equal mass, collide as shown in the figure below. Ball 1 is initially traveling along :5 with a speed of 7.0 m/s, and ball 2 is at rest. After the collision, ball 1 moves away with a speed of 3.0 m/s at an angle 6 = 62°. Ball 1; . ,._ f6 Ball _1_ Ball 2 What is the x—component of the velocity of ball 2 after the collision? (a) -1.41 m/s __ (b) 4.00 m/s ‘4 i? ‘ O 0:) +4.00 m/s "P; .. E. :: 0 (d) +1.41 m/s (6) None of the above. 133:" ...._ 13L, K. = b 0 II in 6" m0 elf 3. Which of the following is most strongly associated with the forward direction of time? (a) Newton’s Laws of Motion. (b) Conservation of Energy. (c) Conservatio c U umentum. d) The flow of heat from hot to cold. I (e) The period or he 9. i re a mg around the sun. 4. The figure below shows a plot of the position, a: as a function of time, t for a particle undergoing simple harmonic motion. Where is the acceleration zero? 1);. . i ’15; ‘13 ‘9’“ (a) 4 1 . ‘7'?" 5? ‘68:) 2 f JS‘ ((9 1 (e) None of the above. 5. A roller coaster of mass 100 kg starts at a height of 3,11 = 10.0 In with a speed of 10.0 m/s. Between the first and second peaks, the roller coaster loses 2000 J of energy to air drag. What is the velocity of the roller coaster at the top of the next hill with height y2 = 4.0 In? Neglect the mass of the wheels. ‘5: a : g 5’1 - b m 5’2 (a) 14.8 m/s (b) 10.8 111/3 A E: WWAWJ (!! 11.3 m/s "“ __, w _—l- E. (e) None of the above. t“; “fray: c 5.10003! + 10830 I)— e (8890‘; {149: ZH‘IS; 131 .1 4-? :1 2~EY?_ ~.~_ 13.22 E h‘ Ebb 6. An ideal reversible Carnot heat engine operates between thermal reservoirs at 573 °C and 25 °C. If 9180 J are extracted from the hot reservoir, how much work is done by the heat engine? (a) 15,130 J (b}17,960J TL 25+ 273.15 [K (c)8780.1 2,: :1.“ “T :1— = 0.9%? w 11+ :1 =. --—-E'-"" WOW—it» 6 Q4}. = 0.9m. ‘mo T = 691% I)" 7. The hand gripping this very long string oscillates up-and—down at a frequency of 1.0 Hz for several minutes. The velocity of wave propagation on the string is 6.6 cm/s. You take a photograph of the string, showing its shape at one instant in time. Which of the following pictures would you see? ‘ ~ cows mg so 8. A ball is thrown straight up into the air and falls back to the ground. Neglect air resistance. While the ball is in the air its speed (a) is zero (b) remains constant (c increases (d) decreases on the way up and increases on the way down (e) none of the above it o~—-9L£ ct Eta 9. Suppose that the Lamborghini company decides to use a new, lower mass alloy for the wheels of next year’s model Lamborghini. This would primarily efiect the car’s (a) manomum acceleration (b mammum velocity (0) both mam'mum velocity and maximum acceleration (d) neither maximum velocity nor maximum acceleration ‘83-'- mqw 3)th 10. It is safe to neglect the efiect of air drag in solving only one of the following questions. Which one is Rival loué it? (c) What is the top speed of a Lamborgluni? (d) What is the terminal velocity of an apple dropped from an airplane at an altitude of 30,000 ft? (e) HOW long does it take for a hockey puck gliding on ice at an initial velocity of 5 In / s to come to (-72) JVDQ val 3; 6; Lelebut 3% Ufi‘lc, ‘lilxwgt (la) 3%th gm rest ’5": O ““"Q 59%" “NF «lab (hawk v'w mic-{ll J. ‘lle 3; vue ...
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