## A cork bobs in water, 1.5 m from shore. Waves traveling

## A cork bobs in water, 1.5 m from shore. Waves traveling

Physics 2CQuiz 14/8/2011Directions: Use pencil only. On your Scantron, you should have already blackened in your Student ID,using â1â for âAâ, making a 9-digit number (for shame if you havenât). Now, fill in ?? in the Test Formbox. You should also have already filled in your 3-digit quiz code under âExam numberâ.Choose the one best answer. Questions may include more or less information than is needed, so sometimesthe answer is ânot enough information.â Pay close attention to the units of given numbers.You may find some of the following formulas and information useful:v F /vkP2 y12 A2v22 x21 2 yv 2 2t 2speed of sound in air = 330 m/s, in water = 1700 m/s. speed of light c = 3.00108 m/s.1. A cork bobs in water, 1.5 m from shore. Waves traveling toward shore hit the cork. If I double theamplitude of those waves, how many times longer does it take the cork to wash to shore?A) 0.71B) 2C) not enough informationD) 1/2E) 1/42. The frequency of a violin string is too high by one half-step (6%). About what fractional change intension must be applied to get it in-tune?A) -12%B) 6%C) 3%D) -36%E) not enough information3. A solar panel on the moon is 1.0 x 2.0 m. The intensity of sunlight on the moon is 1.4 kW/m2. At sometime during the lunar day, the panel is at an angle of 30 deg to the line joining it to the sun. What is thesolar power hitting the panel?A) 2.8 kWB) 3.2 kWC) 1.4 kWD) 4.8 kWE) 2.4 kW4. What is the wave number (spatial frequency) of a 2.0 kHz sound wave, in rad/m?A) 240B) 6.1C) 660D) 660,000E) 385. A wave pulse is given by y(t, x) = 3/[(2x – 3t)2 + 1]. When t = 0 s, the pulse has its maximum at x = 0m. 5 seconds later, at what x value will the maximum be, in m?A) 47B) 1.2C) â7.5D) â47E) 7.56. Which of the following is not a solution of the wave equation?A) ln(3x â 4t)B) A cos(kx â ωt)C) A/(x-t)2D) A cos(kx2 â ωt2)E) A/(x – t)7. Two stereo speakers are mounted on a wall 4.0 m apart, and emit identical harmonic sound waves. Youare on the opposite wall, 8.0 m from the speaker wall, and on the midline between the speakers. You walkparallel to your wall and find a sound minimum 2.0 m from the midline. What is the wavelength of thesound, in m?A) 0.94B) 180C) not enough informationD) 11E) 1.98. A cork bobs on a passing water wave, with an amplitude of 2.0 cm, completing one cycle each second.Similarly, a second cork 15 m away bobs to its minimum exactly when the first cork is at its maximum (andno nearer cork would do this). What is the speed of the water wave, in m/s?A) 15B) 4.8C) 30.D) not enough informationE) 1909. A sound wave of 2.0 kHz takes 40. ms to travel in water between two boats. About how long will awave of 1.0 kHz take, in ms?A) 20.B) 160C) 40.D) not enough informationE) 10.10. A tight wire has a tension of 7.0e2 N. A length of 2.0 m has a mass of 1.0e1 g. What power is neededto send a 1.0 kHz wave with 1.0 mm amplitude?A) 37 WB) 74 WC) 1.2 kWPhysics 2C Sp11Quiz 2D) 14 kWE) 0.037 W4/22/2011Directions: Use pencil only. On your Scantron, you should have already blackened in your Student ID,using â1â for âAâ, making a 9-digit number (for shame if you havenât). Now, fill in A in the Test Formbox. You may also fill in your 3-digit quiz code under âExam numberâ.Choose the one best answer. Questions may include more or less information than is needed, so sometimesthe answer is ânot enough information.â Pay close attention to the units of given numbers.You may find some of the following formulas and information useful:v F /vvPEdkPdB 10 log10P2P12 x2(sound ) dB 10 log10Bt2 y12 A2v2B d 0 0Etf ‘f1 u / v1 2 yv 2 2t 2I21012W/m 2f ‘ f 1 u / vspeed of sound in air = 330.0 m/s, in water = 1700 m/s. speed of light c = 3.00108 m/s.1. Which of the following waves can be polarized?A) water and EM wavesB) water waves C) EM wavesD) sound wavesE) none of these2. A parked car honks its horn at 200.0 Hz. You approach it on a bullet train at 90.00 m/s. What frequencydo you hear, in Hz?A) 255B) 275C) 145D) 157E) 553. A train whistle emits a tone of 400.0 Hz. The train approaches at 30.00 m/s. Standing on the ground,what frequency do you hear, in Hz?A) 367B) 437C) 363D) 37.0E) 4404. I increase the power of a wave by 10. dB. By what factor does the amplitude change?A) 0.10B) 10.C) 5.0D) 2.0E) 3.25. An EM wave travels through a loop of wire, perpendicular to it, carrying 800 W of power through theloop. The area of the loop is 0.10 m2. What is the voltage induced in the loop?A) 80B) 8000C) 8.9D) 28E) 06. A spherical speaker 5 cm in diameter emits 50 W of sound equally in all directions. What is the soundintensity, in dB, 100 m from the source?A) -34B) 175C) 97D) 86E) 467. Vertically polarized light passes through a polarizer. 10% of the light intensity remains. What is theangle of the polarizer axis, in degrees measured from the vertical?A) 84B) 72C) 26D) 18E) 5.78. A 1.0 m wire is stretched and clamped at both ends. The lowest standing wave frequency is 100 Hz.What is the wave speed?A) 400 m/sB) 100 m/sC) 200 m/sD) not enough informationE) 800 m/s9. The output power of a car radio is reduced by a factor of 4. What is the change measured in dB?A) -3B) +3C) -6D) +6E) 0.610. What is the phase difference between the electric and magnetic fields in an EM wave, in degrees?A) 0B) 90C) 270Physics 2CE) â90D) 45Quiz 35/6/2011Directions: Use pencil only. On your Scantron, you should have already blackened in your Student ID,using â1â for âAâ, making a 9-digit number (for shame if you havenât). Now, fill in A in the Test Formbox. You may also fill in your 3-digit quiz code under âExam numberâ.Choose the one best answer. Questions may include more or less information than is needed, so sometimesthe answer is ânot enough information.â Pay close attention to the units of given numbers.You may find some of the following formulas and information useful:v F /vvPEdkPdB 10 log10d sin max mP2P1B d 0 0d sin min m 1/ 2n1 sin 1 n2 sin 22 x2(sound ) dB 10 log10Bt2 y12 A2v2Etf ‘f1 u / va sin min m1 2 yv 2 2t 2I21012 W/m 2f ‘ f 1 u / vtan p n2 / n1tan p n2 / n1speed of sound in air = 330.0 m/s, in water = 1700 m/s. speed of light c = 3.00108 m/s.yθfar awayscreenmirrorlightLaxistop view1. A light beam fully illuminates a 4-slit diffraction slide, creating a central maximum of intensity 2.0mW/sq cm. The slits are 0.1 mm apart. What is the intensity of the central maximum from the same beamwhen a 5th slit is added to the slide, in mW/sq. cm?A) 1.3B) 2.4C) 2.9D) 10.E) 1.62. A soap film illuminated by the sun looks mostly orange (lambda = 600 nm). The index of refraction ofthe film is 1.3, and the solar spectrum peaks at 500 nm. How thick is the film, in nm?A) 115B) 230C) 190D) 96E) 1503. A grating with 300 lines/mm is illuminated with light of wavelength 500 nm. At what angle, in degrees,does the bright line of order m = 1 occur?A) 37B) 22C) 17D) 0.017E) 8.64. A single slit is 10.0 micro-m wide, and illuminated by yellow 500. nm light. A screen is 2.0 m away.How far from the midline of the screen is the first minimum, in mm?A) 50B) 200C) 150D) 160E) 1005. Two plane mirrors make an angle of 78 deg. A light ray enters the system, and reflects once off eachmirror. Through what angle is the ray turned, in degrees?A) 516B) not enough informationC) 24D) 156E) 2046. White light passes through a diffraction grating with horizontal slits, onto a screen. The screen iscentered on, and perpendicular to, the incident light ray. The screen can show what pattern?A) two rainbow spectra, with purple on the outsides of the two, and red on the insidesB) 3 white linesC) a rainbow spectrum, with red on bottom, and purple on topD) a white line in the middle, and two rainbow spectra, with red on the outsides of the two, and purple onthe insidesE) a rainbow spectrum, with red on top, and purple on bottom7. Light incident from a material with n = 1.2 is reflected from an interface with n = 1.7. At what angle willthe light be completely polarized, in degrees?A) 35B) 45C) not enough informationD) 60E) 558. A light ray is reflected from a flat mirror (see diagram above). As the mirror is rotated, the reflected raymoves through an angle of 40 deg. Through what angle was the mirror rotated, in degrees?A) piB) not enough informationC) 20D) 80E) 409. Light passes through two thin slits, which then produces a pattern on a screen. This is an example of:A) reflection and refractionB) diffractionC) diffraction and interferenceD) refractionE) interference10. The speed of light in a material is 0.65c. What is the critical angle for light crossing an interfacebetween the material and vacuum, in degrees?A) 41B) 49Physics 2CC) 33Quiz 4D) not enough informationE) 575/20/2011Directions: Use pencil only. On your Scantron, you should have already blackened in your Student ID,using â1â for âAâ, making a 9-digit number (for shame if you havenât). Now, fill in A in the Test Formbox. You may also fill in your 3-digit quiz code under âExam numberâ.Choose the one best answer. Questions may include more or less information than is needed, so sometimesthe answer is ânot enough information.â Pay close attention to the units of given numbers.You may find some of the following formulas and information useful:d sin max m , d sin min m 1/ 2 ,11 1 11n 1,l l’ fR1 R2L / LTf R/2MT 273.16V / VTcwater 4.184 J/g-KPPT0P3P0n1 sin 1 n2 sin 2h’l’hl5.67 108 W/m2 -K4P H e AT 4 ,Q Lm,a sin min m , tan p n2 / n1 ,Q mc TPV nRT ,H kATxR 8.314 J/K-molU Q WL f ( water ) 334 J/gLv ( water ) 2260 J/gsteel 12 106 /Kspeed of sound in air = 330.0 m/s, in water = 1700 m/s. speed of light c = 3.00108 m/s.index of refraction of water nw = 1.33.1. Alice puts her face close to the front of a fish tank, and sees a fish at the back of the tank in the water.The fish is 2.0 cm long. The tank is 25 cm from front to back. How far away does the fish appear to be, incm?A) not enough informationB) 13C) 19D) 2.7E) 332. A thin, bi-convex lens is to focus an image onto a screen such that the image is life-size. The lens hastwo equal radii of 120 cm, and a refractive index of n = 1.3. What is the total distance between object andimage, in cm?A) 8.0e2B) 4.0e2C) 92D) 180E) not enough information3. The image of a tree on a photographic slide is 1.0 mm high. It is to be projected onto a screen 2.0 mfrom the slide, and is to be 2.0e2 mm high. What focal length lens is needed, in m?A) 89B) 0.0050C) â0.010D) 0.20E) 0.0104. A double-concave lens has equal curvature radii of 12.1 cm. An object 11.0 cm from the lens forms avirtual image 6.02 cm from the lens. What is the index of refraction of the lens material?A) not enough informationB) 2.55C) 2.10D) 1.55E) 1.455. A steel washer has a 18.0 mm diameter hole at 300. K. After the washer is heated to 450. K, what is thediameter, in mm?A) 18.2informationB) 18.1C) 18.0D) 19.0E) 18.3F)notenough6. A constant-volume gas thermometer has a pressure of 75.0 Pa at 300. K. What is the pressure change foreach kelvin of temperature change, in Pa?A) 3.64B) not enough informationC) 4.00D) 0.250E) 0.2757. A 0.10 kg ice cube is at 0.0 C. How much heat does it take to melt it, and raise the temperature to 42 C,in kJ?A) 37.6B) 240C) 170D) 51E) not enough information8. 129 g of water is heated with a small 40. W electric coil immersed in the water. About how long will ittake to raise the temperature from 15 C to 25 C, in seconds?A) 130B) not enough informationC) 32D) 13,000E) 32009. A concave mirror has a curvature radius of 130 cm, and is 10. cm in diameter. An image is virtual,upright, and larger by a factor of 2. What is the distance from the object to the mirror, in cm?A) 200B) 32C) 64D) 98E) not enough information10. An ideal gas is at 12.0e2 Pa and 15.0 C, in a closed container. The temperature is raised to 60.0 C.What is its new pressure, in Pa?A) 1390B) 1040Physics 2CC) 3.00e2Quiz 5D) not enough informationE) 48.0e26/3/2011On your Scantron, you should have already blackened in your Student ID, using â1â for âAâ, making a 9digit number. Now, fill in A in the Test Form box. You should also have already filled in your 3-digit quizcode under âExam numberâ (for shame if you havenât).Choose the one best answer. Questions may include more or less information than is needed, so sometimesthe answer is ânot enough information.â Be careful to note the units of given numbers.You may find some of the following formulas and information useful:5.67 108 W/m2 -K4P H e AT 4 ,T 273.16PPT0PP03PV const,PV nRT ,L / LTQ Lm,U Q WQ mc TH kATxTV 1 constV / VTVW nRT ln 2V1S2 dQ1TCOPACQCWCOPHPQHWTcTh Tcemax 1 Tc / ThCOPmax, ACR 8.314 J/K-molcwater 4.184 J/g-KL f ( water ) 334 J/gLv ( water ) 2260 J/gsteel 12 106 /Kspeed of sound in air = 330.0 m/s, in water = 1700 m/s. speed of light c = 3.00108 m/s.index of refraction of water nw = 1.33. acceleration of gravity = 9.8 m/s21. A complex gas with 4 internal degrees of freedom (plus 3 translational degrees) starts at a pressure of 10.Pa and volume 5.0 m3. It is heated so it expands to 20.0 Pa, and 8.0 m3, such that the expansion follows astraight line on a P-V diagram. How much work is done by the gas, in J?A) 45B) 30.C) not enough informationD) 60.E) 1602. 5.0 g of a solid is melted at 20. deg C. Its heat of fusion is 200.0 J/g. What is the entropy change of thesolid when it melts, in J/K?A) 3.4B) 10.C) 0.68D) 50.E) not enough information3. A heat pump with a COP of 4.7 absorbs heat at a rate of 14 kW. At what rate is it doing work, in kW?A) 66B) 52C) 3.8D) not enough informationE) 3.04. A reversible heat engine operates between 412 K and 264 K. What is its efficiency?A) 0.36B) 0.64C) not enough informationD) 0.56E) 1.565. A very good refrigerator with a COP of 4.2 cools down to 7.0 deg C. What is the maximum hightemperature the refrigerator can use, in deg C?A) 36B) not enough informationC) 8.7D) 74E) 296. A nuclear power plant creates steam at 600 K, and during operation, cools it down to 300 K. Itsoperating efficiency is 30%, and it produces 500 MW of electricity. How much heat does it exhaust, inMW?A) 1700B) 250C) 1200D) 300E) 10007. An ideal gas in a balloon is in equilibrium at P = 845 Pa, and V = 0.30 m3. It is kept at constanttemperature, while the outside pressure is slowly lowered. The balloon expands to 6.0 times its originalsize. How much work does it do during expansion, in J?A) 500B) 450C) 7.3D) not enough informationE) 15008. A piston filled with a diatomic gas is heated at a rate of 210 W. At some time, it has a volume of 2.0 m3,and is doing work at a rate of 130 W. How fast is its internal energy changing, in W?A) -40B) 40C) 80D) 25E) not enough information9. An ideal gas, initially at 300.0 K with V = 0.020 m3, is adiabatically compressed. Its final temperature is400.0 K. For this gas, gamma = 1.3. What is its final volume, in m3?A) not enough informationB) .014C) .022D) .0077E) .05210. An insulated steel thermos holds 2.0 kg water. It falls 3.0 m to the floor, where the water sloshesaround inside the thermos, and comes to equilibrium. No heat escapes from the water. How much does thetemperature of the water increase, in K?A) 273.16B) 0.007C) not enough informationD) 7eâ4E) 0.014If you havenât already, be sure to fill in you Test Form, student ID (9 digits), and quiz code, according tothe directions above.

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