Physics 213 Quiz 6 - Physics 213/223, Evaluated Review 4:30...

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Unformatted text preview: Physics 213/223, Evaluated Review 4:30 PM, DEC. 9, 2011 T. Bolton Name Instructions. Print and sign your name on this quiz and on your scantron card. In doing so, you are acknowledging the KSU Honor Code: “On my honor as a student I have neither giVen nor received unauthorized aid on this assignment.” Work alone and answer all questions. Part I questions must be answered on the Scantron cards. Put your name on your card. Color in the correct box completely for every answer with a pencil. If you make a mistake, erase thoroughly. Don’t forget to color in the boxes for your WID. If we have to correct this by hand we may take off five points from your score! Part II must be answered in the space provided on the test. The last page is a detachable equation sheet. You may use a calculator. You may ask the proctors questions of clarification. Show your work in a clear and organized manner. You may receive partial credit for partial solutions. Solutions lacking supporting calculations will receive no points. Kirk Schulz here. ‘flE'valvated review”? This looks like a quiz to me! Too bad we ’re not in Hawai’i watching the Wildcat volleyball team. Remember to review all the quizzes for the final, and to keep in mind that I did not hire this guy! o All questions to be answered on your Scantron card (100 points total). The first four questions refer to the graph above showing the velocity vs. time for a light, large surface area object launched straight up in the air from the edge of the roof of a building in such a way that it can fall all the way to the ground. The vertical scale gives the velocity in m/s and the horizontal scale the time in s. A time interval of 0.05 s separates each symbol. 1. (2.5 points) At what time does the object reach its highest point? (a) t=0.15. (b t=0.2s. Vt: t=0.5s. W )t=1.0s. (e) 15:205. 2. (2.5 points) Which statement best describes the acceleration? (a) a > 0 for all times. (in) a < 0 for all times. (0) a sé 0 for all times. (d) a > 0 for somes times and a = 0 for some times. a < 0 for somes times and a 2 0 for some times. (UM QU— “l’ < figmfir {>125 3. (2.5 points) At which time does the object reach terminal velocity? (8.) t=0.0 s. (b) t=0.4 s. (c) 75:083. (cl)t=12s e t=1:65: 0'50 M64 4. (2.5 points) About how high does the object go relative to its launch point? a) h==1m. b) h=2m. I (c) h=5m. LL .5 g Er Ur; (d)h=10m. (e) h=20m. a ‘3’ 2M, 5. (2.5 points) Suppose a star of mass M and radius R has a gravitation acceleration g“ on its surface. If the star cdbtracts to a radius R/ 10 while maintaining its mass, the gravitational acceleration on the surface becomes? (a) 0.0lg*. (c) 9*- gs; ' 9. (3/1032 3 (d) 109*. 1009*. 6. (2.5 points) The planet Venus’s period of revolution about the sun is 0.6 earth year. How far away from the sun is m in mutiples of the earth-to—sun distance (astronomical units or a.u.)? VW I 2 3 (a) 0.18 a.u. l DZ: B (b) 0.36 a.u. —'-— 1VB 2/3 c 0.54 a.u. V, G; T: '6) :— .72 a.u. If”? ’ g ) (e) 0.90 a.u. 7. (2.5 points) A major league baseball hitter playing for the Kansas City Royals can take a 45 m/s fastball (mass=0.145 kg) and hit it back at the pitcher at a speed of 55 m/s. The ball remains in contact with the bat for about 1.45 x 10‘3 s during the process of hitting the ball. What is the force of the bat on the ball. a 1001, W A CST-"Klkt (Ovl‘l’r— ) (b) 100 N. c) 1000 N. UNC’xlDflgS) @ 10000 N. : ‘09 [J (B) (C) .. The free body diagrams for the water in the bucket are shown for the three positi . i agrams to the right, with W = mg the weight of the water, N the normal force of the bottom of the bucket on the water in the bucket, and N’ the normal force of the sides of the bucket on the water. 8. (2.5 points) At positions A and C the bucket’s accelerations are directed, respectively,? (a) Upnm- ’79 W of dimlé b Up, down. own, up. (1) Down, down. 9. (2.5 points)At position A the magnitude of the normal force of the bottom of the bucket on the water in the bucket is? a N: M w N+ Hg, = “(15) £32: m M: "‘6 10. (2.5 points)At position C the magnitude of the normal force of the bottom of the bucket on the water in the bucket is? (3) N20. (b) N=mg. [4 NJ M6 3 (H (’23) @Nv:::: 47w N: 2H3 Consider a box weighing 1200 N resting on a. the flat bed of a truck. The static and kinetic coefficients of friction between the box and truck bed are us = 0.5 and {1K = 0.3, respectively. Before 2:00 PM, the truck moves at a constant speed of 20 m/s from west to east on a smooth level road. At exactly 2:00 PM, the truck begins sharply braking on the same road, with the magnitude of its acceleration a. = 3 m/sz. As the truck brakes, the box does not slide. 11. (2.5 points)The horizontal force exerted by the truck on the box before 2:00 PM is closest to (a) 0 N. (b) 360N. a;0 $9 Fga (c) 600 N. (d) 720 N. (e) 1200 N. 12. (2.5 points)The horizontal force exerted by the truck on the box just after 2:00 PM is closest to a . 12 M ((b):61:N. F :5 M4 :1 ((c; 600 N. m 360” ; d 720N. in ' (e) 1200N. ( MP b Elw‘y 1M5” ;@«CMZW)) 13. (2.5 points)The direction of the horizontal force on the box just after 2:00 PM is (a) North. (b) South. c) East. a < 0 =5) (d) West. (8) No direction— 0 force. 14. (2.5 points)The magnitude of the acceleration of the box just after 2:00 PM is closest to (a) 0 m/sz. @2323: m tot Lt amt t3 m We, ((1) 6 m/sz. (e) 10 m/sz. 15. (2.5 points) If it takes you 60 m to stop your car when it is moving 60 mph, how long would it take to stop the car if it were moving at 42 mph under the same road conditions? (You may find useful our “Driving Safety 101” result D = 1’2 ) Zuxg' (a) 15 m. '1 30 m- Dew 15.4.4) (at; )2, J» (c) 60 m. M :3 2 ff v Z (d) 120 m. FDOLD U0” 6 16. (2.5 points) A device used to stop a 106 kg train that has lost its brakes consists of a spring that can be fully compressed over a distance of 3 m. If the maximum acceleration of the train is not to exceed 29/3, what must the spring constant be? . 1.1 x 106 N/m. ‘F _ (4X ‘: Md .2 x 106 N/m. r1 . 9 2 & 3.3 x 106 N/m. $0 6 __, )t j (d) 4.4 x 106 N/m. 6 1 ii, a 3 V1 17. (2.5 points) A neutron moving with speed on = 1500 m/s collides elastically and head-on with a proton that is moving at a speed up = 500 m/s in the same direction. What are the final speeds of the two objects. Note that Mp m Mn. (a) time? = 1000 m/s, 1000 m/s. n '90: Mary (b) Um'up = 1500 m/s, 500 m/s. P c Um'b‘p : 2500 m/s, —500 m/s. B I map = 500 m/s, 1500 m/s. h E p 3 {ii—rah] 18. (2.5 points) Billy—Bob (m = 120 kg) sits in the left end of a 120 kg, 6 m long boat that has its center—of-mass at its geometric center. He staggers to the right end of the boat to fetch some “refreshments”. Neglecting the mass of the refreshments, what happens to the boat as he moves? A V t moves 3.0 m to the left. }It moves 1.5 In to the left. CM A058 Ml W ' (c) It moves 1.5 m to the right. (d) It moves 3.0 m to the right. b ) —} C l20 J ’ \20+ 1? 0 t3, 3 (*3 i (120 1+ X ‘CWl' m: + 0 0 k0; 6 .9 X =3 0 M ‘ “3 M gram 1+ 19. (2.5 points)Two identical balls are allowed to roll down the two hills shown in the figure. The balls start from rest at the same time at the top of the hill to the left. Which statement is most correct concerning the times each ball takes to reach the bottom of the hill, TA and TB, and the speeds of the balls at the bottom of the hill, VA and VB? a)TA=T3andVA—=VB. M tall twill MM I C) TA <T3 and VA =VB. (e) TA=TBandVA<VB. 20. (2.5 points) Referring to the same situation, if we examine the two b ls at the same horizontal displacement from the starting point, excluding the starting and ending positions, which statement about the kinetic and potential energies (K E, PE) of the balls is most true? (a KEA = KEB. ) (b) PEA=PEB. Cg I ) Vt m a? 6%); (c KEA = FEB. (d KEA —— PEA = KEB — PEB. EA + PEA = KER + FEB. 21. (2.5 points) Again referring to the same situation, the kinetic and potential energies of the balls satisfy which condition? a) KEB g KEA and PEB g PEA for equal horizontal displacements. A (S (m W KEB _>_ K EA and PEB S PEA for equal horizontal displacements. a _ / A>TBandVA=VB. db I"‘(d)TA=TBandVA>VB. A-lr He and “tingle .Qnéé' PEAfléfi .\ p (c) KEB g KEA and FEB 2 PEA for equal horizontal displacements. g3 \> (d) K E3 2 KEA and PEB 2 PEA for equal horizontal displacements. (e) KEB = K EA and PEB = PEA for equal horizontal displacements. 0.7" 22. (2.5 points) Take the room clock hands to be vectors. Which way does the hour hand crossed into the minute hand point exactly at 9:00 PM? to the clock. - Towards the right half of the clock. g (c) Towards the left half of the clock. 4 (d) Out of the clock. 23. (2.5 points) What is w for the from hand of a clack? a (a) 1.0 x 10-1 rad/s. 211—- (b 1.7 x 10‘3 rad/s. t: M g @111 x 10—4 rad/s. w ‘2 KQOX‘QO (d) 2.0 x 10‘7 rad/s. 24. (2.5 points) A truck carrying construction materials hits a bump in the road at the top of a hill, causing several objects to roll down the hill. Which of the following takes the least time to reach the bottom? _ i , e . 1 2. (a) A cyllndr cal piece of ste l pipe. E gm W /H8 O (b) A cylindrical piece of aluminum pipe. @ solid concrete cylinder. ,...._..._—-3 g MAW ‘n 2 l g (d) A spare tire from the truck. ._—-—T-) w A: Q 25. (2.5 points) Referring to the previous situation, some number of the objects may “tie”, taking about the same amount of time to reach the bottom of the hill. What best describes the type of tie. (a) No tie. wo—way tie. (c) Three-way tie. (d) Four—way tie. 26. (2.5 points) Suppose you held 10 kg masses in each hand 30 cm away from your body on either side. You then moved the massas out to a position 60 cm away from your body. By what approximate factor would you estimate your rotational inertia to change with respect to rotations about the central axis of your body? ' (a)I-——>2I. (b I—> 31. —+4I. E...) I—+9I. a 27. (2.5 points) The man pictured abov :" a -‘ on a stool that can rotate freely while holding a bicycle wheel that rotates in 'rection as viewed from above. He then turns the wheel over. What happens .' r u of this process? a) Nothing. He remains at rest throughout the process CflnW L 4‘ He rotates in a clockwise direction as viewed from above, with the rotation continuing after the wheel has been turned over. % gt “(6 K (c) He rotates in a counter—clockwise direction as viewed from above, with the rotation continuing after the wheel has been turned over. (d) He rotates in a clockwise direction during the first part of turning the wheel over, and then counterclockwise during the second part, ending with no rotation with the wheel turned all the way over. 28. (2.5 points)As water flows from a small diameter pipe into a large diameter pipe, what happens? (a) Its speed and pressure both increase [(7 W 95$ +9 (bl Its speed increases and its pressure decreases. 06 H0 S: 3 speed decreases and its pressure increases. ’ P mam/<3 "lo 94005 (d) Its speed and pressure both decrease. ( . 29. (2.5 points)By what factor does the conductive heat loss from your +20°C ouse increase if the outside temperature falls from +15°C to w5‘30? ' B 0) 99%| C20 —- “'5’ a 4x. ' x. ob H t: 5x. 0” Ola/kl (d) 20x. 0b!) 30. (2.5 points). Suppose a 1 m long rod made of a particular material with a coefficient of linear expansion of 16 parts-per—million per °C warms by 1°C. By how much does the length of the rod change? +1211?" AL -—— oz AT (2) —16,urn. L— ) (d) —160;im. t: QM )(léfido'b) (+1» 31. (2.5 points) Liquid nitrogen has a specific heat em; = 1.0 x 103 J /°K/kg and latent heats of fusion and vaporization of LF = 2.6 x 10”1 J /kg and Lv = 2.0 x 105 J /kg, respectively. Nitrogen freezes at TF = 63°C and boils at TV = 77°C. Rank from lowest to highest the heat energies requires to melt 1 kg of frozen nitrogen, warm 1 kg of liquid nitrogen from 63°K—r 77°K, and boil 1 kg of liguid nitrogen to its phase. I}: ' ' it?) i a 2. i. x. to 3’ warm, melt, boil. j (7“ éx bl _ M? (b) melt, warm, boil. L, L - 5“}.x {0 (C) warm, hon, melt. AQW C O l :1 2 .Dxlorf (d) melt, boil, warm. A :tzioya loll Dish-m: potential curve at cw“ng 32. Kat} (2.5 points) The graph above shows the three potential energy functions for a particular chemical process as a function of separation X of the objects participating in the reaction, with the units of X given in angstroms, a. popular choice for chemists. The curves are called V1, V2, and V12; at X = 0, V1 has the highest value and V2 the second highest value. In the case where V2 is the potential energy, how many points on its curve would correspond to a state of zero force? (301- (gal/{:0 as} fledghw (b) 2. , 3. t least 5. 33. (2.5 points) Referring to the same graph as in the previous question, which potential energy curves would allow the most stable equlibrium conditions to exist? @333; V7, as “law teen“ (0) V12. (d) Stability Would be the same for all three potential energy functions. 10 34. (2.5 points) If Mario smells his Mama’s delicious spaghetti vangole thirty seconds after his Mama adds the clams to the pasta on the stove, then when would Luigi smell the dish, assuming the molecules responsible for the aroma perform random-walk type motion through the air, and Luigi is four times as far away from the stove as Mario? (a)2({minute after Mama adds the clams. bit/minutes after Mama adds the clams. / minutes after Mama adds the clams. % c1) )6 minutes after Mama adds the clams. ‘ f .. 3?, M " 35. (2.5 points) How do the average speeds of oxygen molecules (molecular weight = 32 g/ mole) compare to nitrogen molecules (molecular weight=28 g/ mole) at room temperature (298°K). (3) Oxygen moves 7% faster than nitrogen. \JS 9:! Oxygen moves 14% faster than nitrogen. A H itrogen moves 7% faster than oxygen. ' 3‘2; ) Nitrogen moves 14% faster than oxygen. z D ) =5 26 a"; 2 36. ( 2.5 points) Suppose 0.1 kg of ice melts in 1 kg of water initially at T = 25°C inside a well—insulated container. Which quantity vvill increase as a result of this process? @he entropy of the ice plus water. 3 r - l ‘ ' (b) The energy of the ice plus water. Q—c CM ed; l : Jo (c) The average temperature of the ice plus water. 4"“ £04 I (d) None of the quantities above will increase. 37. (2.5 points) This room likely contains about 3 X 109 atoms of radon in its approximately 2 X 103 1113 volume, a typical concentration for a well-ventilated building anywhere. At this level, the number of radioactive radon nuclei you breath in per 10"3m3 volume breath falls far below the level of any health concern. However, if by chance all the radon atoms in the room managed to end up in one breath, the situation might be different. The frequency for this happening, assuming the radon atoms can move independently of one another throughout the volume of the room is roughly: (a) About twice in every 106 breaths. (b) About three times in every 109 breaths. _ About six times in every 1020 breaths. @ ‘ bout once every 101900000000" breaths. 6‘ l. 0?— laced“ While watching late—night TV, you hear another series of ads for products from Bolto—Corp Industries, a little known Kansas manufacturer. You suspect that several of these products violate at least one law of thermodynamics. Choose the lowest numbered one violated, if this is the case, for the following three products. For example, if a product violates the first and second laws, mark the first law choice. 38. (2.5 points) The “Bolto-toaster", a device that converts 6 kW of electrical work directly into 6 kW of heat. (a) Violates the zeroth law of thermodynamics. Neal @lcn‘fa 138% c) Violates the second law of thermodynamics. Q W @ l wfo A! o thermodynamic laws need be violated. d bu 39. (2.5 points) The “Bolto-4000”, a small heat engine that generates 12 kW of mechanical power for every 36 kW of input heat energy. (b) Violates the first law of thermodynamics. (a) Violates the zeroth law of thermodynamics. (b) Violates the first law of thermodynamics. c) Violates the second law of thermodynamics. ® No thermodynamic laws need be violated. 40. (2.5 points) The “Bolto-QOOO”, another small heat engine that generates 25 kW of mechanical power for every 5 kW of heat energy it exhausts to the environment as it operates between temperatues of 600°K and 1200°K. (a) Violates the zeroth law of thermodynamics. b Violates the first law of thermodynamics. iolates the second law of thermodynamics. (d) No thermodynamic laws need be violated. 12 £49.. at ...
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This note was uploaded on 01/29/2012 for the course PHYS 213 taught by Professor Oshea during the Fall '08 term at Kansas State University.

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Physics 213 Quiz 6 - Physics 213/223, Evaluated Review 4:30...

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