MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

Transcription

1 Final Exam Version C 1) A piston-cylinder system has initial volume 1.0 liters, and contains ideal gas at 300K and 1.0atm, with Cv=2.5R. The piston is held fixed and cylinder placed in contact with a heat reservoir at 600K. Once equilibrium is reached, gas is allowed to expand isormally. When pressure reaches 1atm, gas is cooled at constant pressure to 300K. This cyclic process is repeated once a second. What is rate at which gas does work? 10W B) 20W C) 40W D) 80W E) 160W 2) A cylindrical tank 2.4m deep is full to brim with water (n=1.3. Sunlight first hits part bottom tank when rising sun makes a 22 degree angle with horizon. Find tanks diameter. 1.5m B) 2.5m C) 3.5m D) 4.5m E) 5.5m

2 C) norast-southwest C) norast-southwest D) northwest-souast D) northwest-souast E) east-west E) east-west What's minimum thickness soap film (n=1.3 in which 550nm light will undergo What's minimum thickness a soap film (n=1.3 in which 550nm light will undergo constructive interference? constructive interference? 400nm B) 300nm C) 200nm D) 100nm 400nm B) 300nm C) 200nm D) 100nm lense with circular aperture 1cm in diameter is just barely capable seperating two A lense with a circular aperture 1cm in diameter is just barely capable seperating two objects that are degree apart. What's length light from two objects? objects that are 1 degree apart. What's length light from two objects? On land, 1mm most massive B) concrete 10mm block you can C) carry 100mm is 25 kg. How massive D) 1m a 1mm B) 10mm C) 100mm D) 1m!"#$%&''##("#&''##)"#&$''##*"#&$$''##+"&'## block could you carry under water, if density concrete is 2300 kg/m 3. Poarizeddlight passes sequence two polarizer whose axes polarization form (Density Poarizeddlight water passes = 1000 kg/ma 3 sequence ) two polarizer whose axes polarization form a 60 degrees angle. The second polarizer has same polarization as incoming light before it 60 degrees angle. The second polarizer has same polarization as incoming light before it hits first polarizer. What fraction incident intensity emerges from set hits 10 kg first B) polarizer. 25 kg C) What 35 kg fraction D) 45 kg E) incident 60 kg intensity emerges from set polarizers? polarizers? 1/2 B) 1/4 C) 1/8 D) 1/16 E) 1/2 B) 1/4 C) 1/8 D) 1/16 E) 0 $%&'("&)'"*+,)&"-./0'*")'*'"+/"123455"6'7-8/'"&)'"-.,9'".'':/ ;."*-:+-./"*-&)'*"&)-.":',*''/3"<.:";"6="5+/&->'"*-."&)'".856' An ideal gas occupying 1.0 cm 3 is placed into a 1.0 m 3 vacuum chamber, where it expands adiabafcally. If 6.5 J energy become unavailable to 480nm. do work, What's what was maximum inifal achievable gas pressure? angular seperation? grating with 6000 gratings across 1cm is used to seperate two lengths 550nm and A grating with 6000 gratings across 1cm is used to seperate two lengths 550nm and 480nm. What's maximum achievable angular seperation? degrees 6 degrees B) 180 degrees B) Pa degrees B) 0.5 kpa C) 5 kpa D) 50 kpa E) 500 kpa C) 10 degrees C) 10 degrees D) 20 degrees The D) three 20 degrees corners a prism are at location (0,0), (0,, and (6,0). White light strikes E) 30 degrees prism E) 30 at degrees (0, exactly orthogonal to prism surface. What's angle dispersion between red (700nm, n=1.51 and violet (400nm, n=1.538)? 2.15 degrees B) 4.3 degrees C) 6.45 degrees D) 8.6 degrees 0.25 degrees B) 0.75 degrees C) 1.5 degrees D) 2.0 degrees E) 4.8 degrees

3 7) A double convex lens with equal curvature radii 38cm is made from glass with refractive index ranging from 1.51 to 1.54 across visible spectrum light (i.e. from red to blue). A white light is placed on lens axis at a place 95cm away from lens. Over what range will it's visible image be smeared? 2.9cm B) 5.5cm C) 8.3cm D) 9.4cm E) 11.2cm 8) Given cyclic processes 1 and 2, which statements is most accurate. Process 1: Isochoric pressure decrease, followed by isobaric expansion, followed by isormal compression to arrive back at starfng point. Process 2: Isochoric pressure increase, followed by adiabafc expansion, followed by isormal compression to arrive back at starfng point. One two processes does not get you back to starfng point. B) In both cases gas does same amount work. C) W is larger in process 1 than in process 2 D) W is smaller in process 1 than in process 2. E) Neir two processes make any sense because neir can possibly get you back to starfng point.

4 9) Three gases 1mol each have same amount internal energy. The gases have 3,5,7 degrees freedom. Which will have largest average velocity for each molecule? gas with 3 degrees freedom B) gas with 5 degrees freedom C) gas with 7 degrees freedom D) same, because average velocity depends only on temperature. Assume that molecules all three gases have same mass. 10) How much ice can a 625 W micro melt in 1min if ice is initially at 0 degree Celsius? (Lf = 334 J/gram) 0.1 kg B) 0.5 kg C) 1kg D) 5 kg E) 10 kg

5 " 6>"" 11) 12) E) prism less at than (0, 10% exactly orthogonal light is left to after prism 10km surface. What's angle dispersion between red (700nm, n=1.51 and violet (400nm, n=1.538)? 2.15 degrees B) 4.3 degrees C) 6.45 degrees D) 8.6 degrees Two mirrors are arranged such that y are parallel to x and y axis rectangular coordinate An High electric quality system. field optical in an fiber EM is rated traveling at 0.25dB/km. norast By oscillates what factor up does and down. light In intensity what direction change A does after laser traversing beam magnetic enters 10km field oscillate? mirror arrangement, such a fiber? hits each mirror once, and exits. What's total change north-south 1.28 in direction that laser light experiences? $%&'"&'"(")(*+,"-./*0*"1/.)+02" B) B) Depends up-down 0.78 on incidence angle. B) C) C) 90 norast-southwest 0.75 degrees C) D) D) 180 northwest-souast 0.5degrees D) E) E) 270 east-west less degrees than 10% light is left after 10km E) 360 degrees Two mirrors are arranged such that y are parallel to x and y axis rectangular 7) A coordinate laser beam system. with length 633nm is propagating in air when it strikes a transparent material A laser at beam an incidence enters angle mirror arrangement, 50 degrees. If hits each angle mirror refraction once, and is exits. 27 degrees, What's what total is length change in direction that laser light experiences? $%&'"&'"(")(*+,"-./*0*"1/.)+02" in material? Depends on incidence angle. 400 nm B) 500 nm C) 600 nm D) 700 nm E) 800 nm B) 90 degrees C) 180 degrees D) 270 degrees E) 360 degrees 7) " 7) A laser beam with length 633nm is propagating 1 in air when it strikes a transparent 7) material at an incidence angle 50 degrees. If angle refraction is 27 degrees, what is 1 length in material? 400 nm B) 500 nm C) 600 nm D) 700 nm E) 800 nm 1

6 it to at at Exam rejects violin. it to a 2000kg block ice at it's melting point. How long can engine operate at its efficiency? 15cm (Lf=334kJ/kg) B) 17cm C) 11cm D) 13cm E) 19cm At a for point ever15m from B) B) a source 1 day spherical C) 12 sound hourss, you D) 6 measure hours a sound E) intensity 3 hours 8) 7) A 1500mW/m^2. small horn emits flute 10.75cm sound at long, a frequency and open at 160Hz. one end. What closed frequency at or is heard is played by an near observer a taut moving guitar 8) 7 A Carnot engine operates between a high temperature reservoir at at 463K and a river with water Exam string How much furr do you need to walk, directly away from source, until sound away with from fundamental source at frequency 26m/s? 600Hz. What's lowest frequency that leads to at at If it it 1 standing intensity 285K. If has it absorbs changed 3200J by -4.4dB. heat each cycle, how much work per cycle does it do? MULTIPLE CHOICE. 140Hz s on both 1230 J Choose B) instruments? one B) 150Hz (Speed B) 1981 alternative J that C) best 160Hz air = 344m/s) C) C) completes 1219 J D) statement 170Hz D) D) 1970 or answers E) J 180Hz question m B) 10m C) 20m D) 15m 7) 1) 7) The B) Two maximum re is an no mols an ideal frequency such frequency gas undergo human a reversible ear can isormal detect is about expansion 20kHz. from If you walk cubic into meters a room 7) in 7) 1) The to which C) to 1800 intensity sound from a localized source decreases as inverse square distance re cubic are meters two sources, at at a temperature one 100kHz degree and one Celsius. at 102kHz. What Will change you hear entrpy anything? What from MULTIPLE if CHOICE. D) gas? 2400 second Choose source is at one one 125kHz? alternative that that best best completes statement or or answers question. E) source Yes, 1200 Does that mean that sound looses energy as it propagates? yes. B) B) 6 C) C) D) D) E) E) Yes. zero 1) 1) The The B) No, maximum no. frequency human human ear ear can can detect detect about about 20kHz. 20kHz. If If you you walk walk into into a room a room in in 1) 1 8) 8) Two B) Two No. kilogram!"#$%&'(%)*'++,' ice ice at at zero zero degree Celsius melted and and converted to to water at zero zero degree 8) 9) which Sound which C) Yes, re re but are are only two two in certain sources, places one one in 100kHz 100kHz room and and for one one first 102kHz. case, Will and Will no you you in hear hear second anything? case. What What 8) 1 C) Depends intensity Celsius. on in Compute its normal its frequency conversation change in in entropy, light. is about 1microWatt/square-meter. 1 What is 9) assuming melting is done done reversibly. The The heat heat if displacement if D) second Yes, second no. source source amplitude at at 125kHz? air in a 2.5kHz sound this intensity? fusion fusion water water Lf=334 Lf=334 kj/kg. kj/kg. E) Yes, No, Yes, 4mm 0 k yes. yes. "Vibrato" kin a violin B) B) is produced 1 k k by sliding C) C) 2 k k finger back D) D) and 4 k k forth along a E) E) vibrating 8 k k string. B) B) No, 4micrometer No, no. no. The G-string on a particular violin measures 30cm between bridge and its far end and is 2) C) If C) Yes, 4nanometer Yes, pressure but but only only amplitude in in certain certain places a places sound in in room room doubles, for for what first first happens case, case, and and to no no in decibel in second second level? case. case. clamped rigidly at both points. It's fundamental frequency is 197Hz. How far from ("nut") 2) D) D) Yes, -2dB 4picometer Yes, no. no. end should a violinist B) place 0dBa finger so that C) 2dBG-string plays D) 4dB note A (440Hz)? E) Note: 6dB As E) E) No, 4cm No, yes. yes. discussed in class, bridge end violin is end that's near your cheek when playing You see an airplane straight overhead at an altitude 1 violin. The nut end violin is end far away 5.2km. from your Sound cheek from when plane, playing however, 2) 10) 2) seems If The If violin. pressure speed pressure to be coming sound amplitude from in body a point a tissue sound a sound back is essentially along doubles, doubles, plane's sane what what path as happens in happens at water. a 35 degree to What to angle decibel is decibel length to level? level? 10) 2) 2 1 vertical. -2dB ultrasound -2dB 15cmWhat is (2MHz) plane's B) B) 0dB that 17cm 0dBspeed, is used assuming medical C) C) C) a 2dB 11cm 2dB diagnostics? sound speed (v=1497m/s) 330 D) D) 13cm 4dB 4dB m/s? E) E) E) 19cm 6dB 6dB 100m/s 0.1mm B) 200m/s 0.4mm C) 0.5mm 300m/s D) 0.75mm 400m/s E) 2mm 500m/s 7) You You A horn see see an emits an airplane airplane sound straight at straight a frequency overhead overhead at 160Hz. at an an altitude altitude What frequency 5.2km. 5.2km. Sound is Sound heard from by from an observer plane, plane, however, moving however, 7) 3 At seems seems away a soccer to from to be be game, coming coming source from from "" at a 26m/s point a point might? back back circulate along along plane's plane's stands path path at at and a 35 a 35 move around angle angle to to stadium. vertical. vertical. 140Hz What What In this plane's plane's B) motion, 150Hz speed, speed, people assuming assuming stand C) up 160Hz a sound a and sound sit down speed speed as D) Hz 330 m/s? m/s? passes. What E) 180Hz type 100m/s 100m/s would this be characterized B) B) 200m/s 200m/s as? C) C) 300m/s 300m/s D) D) 400m/s 400m/s E) E) 500m/s 500m/s polarized At At B) a soccer a longitudinal soccer game, game, "" "" might might circulate circulate stands stands and and move move around around 4 stadium. C) transverse In this motion, people stand up and sit down as passes. What type

7 #" D) E) 2nR on gas D) D) 0.1kW depends depends on on temperature temperature ideal ideal gas gas E) 2nR E) 2nR 2) Consider B) E) 0.3kW 2nR a tank water with 24cm diameter filled with water to a height 70cm. Consider a 2) An very C) engine 1kW small with hole a at mechanical height 20cm power from output bottom. 17kW Find extracts speed heat at from which a source water 420K exits and An rejects it to a 2000kg a block ice at it's melting point. How long can engine a operate at and its An tank An D) engine engine 3kW with with a hole. mechanical mechanical (Density power power water output output = 1000kg/m^ 17kW 17kW extracts extracts heat heat from from a source source 420K 420K and and 17) efficiency? it to (Lf=334kJ/kg) a ice at it's can its rejects rejects E) Area 2m/s it it it to to to a well 2000kg 2000kg is needed block block to ice ice calculate at at at it's it's melting melting power. point. point. How How long long can can engine engine operate operate at at at its its for ever efficiency? B) 3m/s (Lf=334kJ/kg) B) 1 day C) 12 hours D) 6 hours E) 3 hours $" How for B) 1 day C) 12 D) 6 E) 3 C) for 5m/s for much ever ever would a lead B) B) B) 1 brick day day dimensions C) C) in hours hours x 2.0in x 5.0 D) D) in 6 hours weigh hours if placed E) E) in 3 oil hours hours with A density Carnot D) 7m/s 0.92 engine g/cm^3 operates? (Density between a lead high = temperature 11.4 g/cm^ reservoir at 463K and a river with water at 285K. If it absorbs 3200J heat each a cycle, how much work per at cycle does and a it do? A E) Carnot 0.2kg can't tell engine unless operates B) diameter 0.3kg between a high high hole C) temperature 3.5kg is known. reservoir D) at 4.0kg at at 463K and and a river E) with 4.5kg with water Exam at Exam at at at 285K If JIf If If it it it it absorbs 3200J B) 1981 heat heat J each cycle, how C) much 1219 work J per per per cycle does D) it it it do? 1970 it do? do? J A double slit system is used to measure length light. The system has slit spacing %" 7) 1230 J J B) B) B) B) 1981 J J C) C) C) C) 1219 J J D) D) D) D) 1970 J J 18) d=15 micron and slit-to-screen distance L=2.2m. If m=1 maximum in interference Water Water enters at a pressure a house 200 kpa a is pipe flowing with at an 3m/s inside diameter a pipe, 2cm when at an it absolute encounters pressure an 7) 7) Two 400 mols an ideal gas undergo a reversible isormal expansion from cubic meters 7) 7) 7) 7) obstruction kpa. A 1cm to pattern cubic occurs an where diameter an an meters 7.1cm gas at pressure pipe leads from a temperature drops from screen a by center, 10%. ground 25 degree What what fraction floor (where Celsius. What length is pipe's water change area piping is enters 7) house) Two mols an ideal gas undergo a reversible isormal expansion from light? entrpy cubic meters 7) 7) 7) 7) to obstructed?(density to second to to gas? 375nm floor at water bathroom, B) a 400nm = 1000kg/m^ 5m above. When flow speed at 2cm diameter inlet is to 1.5m/s, cubic find meters water pressure a temperature in bathroom.(density C) degree 425nm Celsius. What water D) 450nm = 1000kg/m^ change entrpy E) 475nm MULTIPLE MULTIPLE 0.6 CHOICE. CHOICE. 50% B) 60% C) 70% D) 80% E) 90% gas? 310 kpa Choose Choose B) B) one one kpaalternative alternative C) C) 60 that that 350 best kpa best completes completes D) D) statement kpa statement or or E) answers E) answers zero 390 kpa question. question. Physics!" 2CA Quiz B) B) B) B) 6 6 C) C) C) D) D) D) E) E) E) zero 8) Two 1) A 1) pump You You kilogram want want uses to to a create piston ice create zero a heat heat 10cm degree engine. engine. diameter Celsius Pick Pick that is moves melted set set and temperature temperature a speed 1cm/s. converted baths baths to water that that What at will will is zero lead lead fluid degree to to best best 8) The water in a garden hose is at a gauge pressure 210kPa, and is moving negligible speed. 8) 1) 1) 8) Celsius. 19) heat heat Compute engine. engine. 8) 8) velocity Two a tube ice its ice at 10mm change at at zero in diameter? 8) The Two hose kilogram terminates ice in at a zero sprinkler degree entropy, system Celsius assuming consisting melted melting and and many converted small is done holes. to to to reversibly. water What at at is zero The zero heat degree 8) 8) 8) fusion T1 T1 water = is Lf=334 its C; C; kj/kg. T2 T2 in = cm/s its B) 10cm/s in C) 1m/s is D) 10m/s done The E) 100m/s maximum Celsius. Compute height reached its change by in entropy, water from assuming 999 emerging melting holes?(density is done reversibly. water = The heat heat 0 B) k B) T1 T1 = is B) C; 1 C; k T2 T2 = C) 1000kg/m^ fusion fusion water water is Lf=334 Lf=334 kj/kg. kj/kg. 2 D) 4 k E) 8 Water 0 C) C) T1 T1 = B) C; 1 C; T2 T2 = Kelvin Kelvin k is pumped out B) a k well at 2.0m/s C) 2 ka 9.0cm diameter D) 4 k hose. The well E) is kfeet #" 5m 0 k B) B) 10m 1 k C) C) 15m 2 k D) D) 20m 4 k E) E) 25m 8 deep. D) D) What T1 T1 = power is needed Fahrenheit; Fahrenheit; by T2 T2 pump?(density = Fahrenheit Fahrenheit water = 1000kg/m^ 9) A venturi E) 0.1kW E) T1 T1 flow = meter degrees degrees is used C; C; T2 T2 to = measure degrees degrees flow rate water (density = 1000 kg/m^ 9) B) 0.3kW The interior a pipe a diameter house is 2cm. maintained At venturi at 22 degree (= 1 C constriction) while outdoor flowmeter temperature is -5 20) 2) diameter C) 1kW 2) degree The The interior interior is reduced The house a house to house 1cm. looses The maintained maintained manometer heat at a rate at at tube 40kW. contains What C while while oil with is entropy outdoor density outdoor 0.8 increase temperature temperature times that is D) 3kW!"#$%&'(%)*'++,' is universe ) 2) 1 per second The because The house house looses this looses irreversible heat heat at at a rate heat rate flow? 40kW. 40kW. water. If difference in oil levels on two sides 1 What What manometer entropy entropy tube is increase increase 2cm, what is universe universe!" volume E) Area well is needed to calculate power. per per 12 second second per second because because that B) flows this 13.5 this irreversible irreversible pipe? heat heat C) 15 flow? flow? D) 16.5 E) 18 2 cubic-cm/sec B) B) C) C) D) D) E) E) How B) 5 much cubic-cm/sec would a lead brick dimensions 2.0in x 2.0in x 5.0 in weigh if placed in oil with density C) A 10 reversible reversible cubic-cm/sec 0.92 g/cm^3 heat heat engine engine? (Density operates operates lead between between = 11.4 g/cm^ T c = Celsius Celsius and and T h = Celsius. Celsius. D) kg cubic-cm/sec B) 0.3kg C) 3.5kg D) 4.0kg E) 4.5kg What What its its efficiency? E) 40 cubic-cm/sec efficiency? #"