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习题练习：Physics Unit12: Sound
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 作者: admin  发布日期: 2022-09-26 09:56    总分: 87分  得分: _____________

答题人: 匿名未登录  开始时间: 22年08月07日 09:59  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following isjyc 7e j 9ho,e(.rrr4f a false statement?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In general, sound is conducted fastest throuuh/f6 rz27xne gh

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the speed of sound in a steel ro*dc m9e(,m/gsk6 rai3o3ou v2lal4mx d?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  As the temperature of the air increases, what happe: s:z7uxh(70m 2 bqoc+g abdyue- muy)ns to the velocity of sound? (Assume that all other fact2q+ mymygszu odh-u7 0:ab( c uxe7)b:ors remain constant.)

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the velocity of a 400 Hz sound, the velocity of a v.no.x,*tu ya b7qf2 syz+.pd200 Hz sound through air i2xf,ayys.+n..* t puvb7q o dzs

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the wavelength of a 400 Hz sound, the wavelength of a 20yrqalc.yn3 . nab69/0: hcrye0 Hz sound i9..h 3qlyan6n yc0er rca/b:y n air is

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequencies greater thanq 8lcmt(*qx rht * 4k3q7imbse8tx.0j 20,000 Hz are called

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequency less than 20 Hz a*7qrg3 w 73ayeihxc4d oe4:qtre called

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a sound source is emi/f,e*:qybz*+qq4q: gizanrr tting waves uniformly in all directions. If you move to a point twice as faaqn +zqizqg r:yq f: e*4b*,/rr away from the source, the frequency of the sound will be

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  For spherically diverging waves, intensity is proportionam; b j(0wam6m0w /jlnxrkxwg 6-(db3bl to

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity of a point source at a distance d from z, m,)46irfdlv ,g i ua-zy z,1o/nhnfthe source is I. What is the intensity at a distance 2d from the souz -dgoz rn6f14z)h,yi/n,uv,l, f ia mrce?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a sound source that is radiating equsxy 3ah 07x0jbally in all directions. What happens to thehxby07x a03s j intensity of the sound? It reduces to

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distance from a sound source that is radiating equal;0s/x g kexwu.+f ;laa6pbol 0ly in all dir0xapslwxl0 e a.g; kb ;/6uof+ections. What happens to the intensity level of the sound? It drops by

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Which of the following increnq0f8i5 -s7 br-tk cswases as a sound becomes louder?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You move slowly toward a speax-/wc2+fu tf )bcifwx,w-g)o ker emitting a pure tone. What characteristic of the sound increases,ocbg/ fti f wc2wu-w+fxx-))?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness" of a muf 7v.a4igvcc:zdo ey 62bq-a;sical note?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pitch" of a musical;dk0usp/fh 3 y note?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When sound passes from airom+i)bn 2ev;grc8e1kil4 g v( into water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement wsq .7bof6lh8 +mz xu4.eidz/ gaves are

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the standing wave on a guita c.;pb.5y.y e8j3yq tkn i.qkd(ad 8vnr string and the sound wave generated by the guitar as a result of this vibration. What do these two .qqckd.y5.je3td; (b vpa.nk88yy i n waves have in common?

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe which is open at both endg+ yhfq04p st)((rtnas, there

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider an open pipe of length L. What are the wavelengths of the t 5n8tngo jip/6hree lowest tones produced byg5 toinp 8/6nj this pipe?

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an bs; zdjf;qc(0open pipe of length L is 200 Hz. Which one of the following frequencies will not resonate q jzbc(;s;df0in the same pipe?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An open pipe of length L is resonating at its fundamnmb2fti 388kf ental frequency. Which statemkbn2fi8 8t f3ment is correct?

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a resonating pipe 9w,(nqmc()hoipl k p.t6.y qi which is open at one end and closed at the other, there

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider a closed pipe of length L. What are the wavelengths of the three lo2,zfws ,szqp/ west tones produced by thzsw/pq,s 2,f zis pipe?

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in a closed pipe of length L iszug sba.h qkjaa81ys6 -4r2g / 200 Hz. Which of the following frequen/ghz4-68jgak 2. barssyaq1 u cies will not resonate in that pipe?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pipe of length L closed at one end is resonating at its fundamp8+luy f/ w1dpl0xs*aental frequency. Which statement is cor/d 81luap+ lspwy f0*xrect?

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person stands between two speakers d - (7ta1 os;xwb+ueekr ke(o)criven by the same source. Each speaker produces a to eskko war; 1+ux-o7et(b (e)cne with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person is
1.65 m from one speaker and 4.95 m from the other. What type of interference does the person sense?

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In order to produce beats 2gjvo/xaf+i:i:b1 yf-;rvhh , the two sound waves should have

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two pure tones are sounded together and a par-ul*smc;roqd 7r4;su ticular beat frequency is heard. What happens to the beat frequency if the fc 4 o7mr-;su;* qsludrrequency of one of the tones is increased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift exp mh5z7.:c:ko 3nexpyqlains

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approaches a stationary observer. The6h7drp h*u.*e ehxj3 e frequency heard by the observ*edj3.pxe e h7rh* u6her is

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source departs )w5for8py z9axzcle/)(u iz6 from a stationary observer. The frequency heard by the observer islpi8zrf6woay 59 /uz( e)zc)x

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a jet plane were to double its MACH-speed, its half-angle wiw05osv8wbon )ll decrease by a fac )won5v8s0obw tor of:

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The speed of an ultrasonic sound of frequency 45 kHz in air is 352 m/sm4p3l 3g 0zlge1ur+l4fej3a c . What is the air temperatur l3mfl4+a1g3r j 0epul3gcez4 e?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of the speed of sound in aiy2op4dwr b** mr at $0 \; ^{\circ}C$ to the speed at $100 \; ^{\circ}C$?

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a day when the speed of sound in air is 340 m/s, a bar7noj j a26mckohkh(pk6 +1g7 t emits a shriek whose echo reachrm +(knogoc72a 6kkhhp 1j 67jes it 0.0250 s later. How far away was the object that reflected back the sound?

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You shout at a cliff, and hear the echo in 4.00 s.z/1uzb inp(z*hi dt 7: The temperature is $0 \; ^{\circ}C$. How far away is the cliff?

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you hear thunder 5.0 s afte0ws c .z(hyw:r-gj,wmzygl5 /r seeing a flash of lightning, the distance to the lightning strike is abou :- jzgw0swhlm/z5(. ,rygwcyt

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An echo is heard 2.0 s from a cliff on a day the temperat h.8apjj /dme4ure is $15 \; ^{\circ}C$. Approximately how far is the cliff from the observer?

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  On a $30 \; ^{\circ}C$ day, there is an explosion. The sound is heard 3.4 s after seeing the flash. How far away was the explosion?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You drop a stone into a deep well and hear the splash 2.5 s l3flss0y: tuj .ater. How deep is the well? (Ignore air resistance, aluy s:3sj0. ftnd assume the velocity of sound is 340 m/s.)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelength in air of a sound wave of frequen4cq;l:3e 2q 0 xdeneawcy 500 Hz is

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound traveling in air fiu9nq *v*4 w-kd;fsvat $23 \; ^{\circ}C$ enters a cold front where the air temperature is $2 \; ^{\circ}C$. If the sound frequency is 1500 Hz, determine the wavelength in the warmer air and in the colder air.

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity level of p*qozy6xs4y. /qfx4kh3 2r6u-d:m z pcytr s+a sound with intensity $10^{-3} \; W/m^{2}$?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the intensity of a 70-mtyk-zex0p f5aufa /h7 )j68 a1mr*uldB sound?

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of th kwufvk5 i8u++j;unh5p/ yb9x e intensities of two sounds with intensity levels of 70 dB and 40 5j/kh 9+xnvufwuyi+k ;ubp85dB?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level by 15 engines in a garage is 100 dB.5 sq1l6 ddgp;g a41)fpvui np; What is the intensity level genera1lp4ugp1a6; gid;s d vfq np)5ted by one engine?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a distance ofda:7g08u 03rkh ie okl 6.0 m from a source that is radiating equally in all directionl 80k:d r0oh7ia kgeu3s is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the power emitted by the source?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity at a distance of 6.0 m from a source that is radiatingb8rrk 0ysg3 q9 equally in all directioq8ry grk03 b9sns is
$6.0 \times 10^{-10} \; W/m^{2}$. What is the intensity level in dB?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A barking dog delive nn+3 gmyf)3jzrs about 1 mW of power, which is assumed to be uniformly distributed ing3)+yfjn m3 nz all directions. What is the intensity level at a distance 5.00 m from the dog?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity level is 65 dB at a disox 3,,w3-w1ep j ebibqtance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close to each other are j1xewb,e3p-q 3b,iwo barking?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At a distance of 15 m fru(z3o9 mwtsn6 b3e (gaeg1v.eom a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the smzt uwsgave.ge6o 31eb((3n9 ource radiates equally in all directions.

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The sound intensity level 5.0 m from a point sour b 6gcexia*: aw1 ezg;7b5-uwqce is 95 dB. At what distance wix a *-ze7bqwu:eg6b5;wcg1ai ll it be 75 dB?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The third harmonic of a complex tone has a frequenc17 p4cu/ ,jygmo5z bdyy of 1200 Hz. What is the frequency of the fourth hau pz4cod/1y g,jmyb75 rmonic?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of the third harmonic of an open pipe is 900 Hz. What b 0av6bw 9:o xnfm:e1tis the length v en: bx m6a9wbto10f:of the pipe?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The lowest tone to resonate in an open pipe of lengty(w6xc pk-c 4g k-t5r;v5gidgh L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of k-c gw6y4gp- g5xrvtd5 ; ick(length 2L?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An organ pipe open at both ends has a length of 0.q 1 95 b tugen977jeskxyj1gm980 m. If the velocity of sound in air is 340 m/s, what is the frequenmj9 1es yu5tnbkg x7j791 qeg9cy of the second harmonic?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a room v ft+ych+9 .nuwhere the temperature is $20 \; ^{\circ}C$. What is the fundamental
frequency if the pipe is open at both ends?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The fundamental frequency in a pipe closed at one end is 330 Ha-uj1i)wc kiiv l0)p (z. What is the frev(cp1ui) ) 0a-j lkiiwquency of the third harmonic?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the length of the shortest pipeqx qkgr818v+ ; ulup,n closed on one end that will have a fundamental frequency of 6 x1vn;q8 +ulq8g rupk,0 Hz on a day when the velocity of sound is 340 m/s?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a room where thc40nmi2c lg2pe temperature is $20 \; ^{\circ}C$. What is the fundamental frequency if the pipe is closed at one end?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 3.00-m long pipe is in a room where the temperat/4eb d62n js- rvj7wnqure is $20 \; ^{\circ}C$. What is the frequency of the second harmonic if the pipe is closed at one end?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A closed organ pipe of length 0.75 m is played wp k:dqot5a .r7r i4ea-hen the speed of sound in air is 340 m/s. pi.k :to54a drq-a7erWhat is the fundamental frequency?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider two pipes of the same length: one is open abv4lanb14t u1m fqh;0nd the other is closed on one end. If the fundamental frequency of the open pipe4at;b 1nhflvq 1 ub04m is 300 Hz, what is the fundamental frequency of the closed pipe?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two adjacent sources each emit a frequency of 800 tu8t;qcrg.h j04xhe jl/i-z(Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observer in front of the sources would hear no s;i jr.(lq40j-hze ttx/hg u8c ound?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two speakers are placed side by side and driven by the same frequency of 500 Hq .ib;(ot9nn +clx0q7ch3iq fz. If the distance from a person to one speaker is 5.00 m and the persox t 3097i;n+liqq of.(cnchbqn detects little or no sound, which of the following is a possible the distance from the person to the other speaker? (The sound speed is 340 m/s.)

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two tunes have frequencies of 440 Hz and 444 Hz. What is the beat freqa*;kq9f v lp) eck70efuency?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A music tuner uses a 550-Hz tuning fork to tune the frequency 8h m j:vrar(f sfd1cyf.4-0veof a musical instrument. If the tuner hears a beat frequency of 2 Hz, f-v ya 4(fjh:m 8s .f0rdevc1rwhat is the frequency of the instrument?

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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The wavelengths of the souefiy7,v obho,:1zlowiscl r7x-t+ - (nds produced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the h7 +1zv t,o:r ho,ix bwie-7(clols-yforns are sounded on a day when the velocity of sound is 340 m/s?

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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The corresponding violin strings on two violins in an orchestra are+n39 c ;ityfmrypopw-fuwr5/ s8 tf66 found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage chan;rfy6 tui5wpr+w69f ct s 3opmf/ 8yn-ge in the tension of one of the strings would bring them to the same frequency?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An observer approaches a stationary 1000-Hz sound source at twice the gf.z;;sfq /oxi y c/5keko;.v.f da 8pspeed of sound. The observer hears a fr/gq;oofix/.;..ck fdfyv zep 8 ak;5 sequency of

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source (normal frequency of 1000 Hz) approkq,k 9 2r eufj;9ml1 c-f)s8jewf j0uzaches a stationary observer at one-half the speed of soun fzw,fjs29);jj-ce0 ur9ulfm ek 81qk d. The observer hears a frequency of

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound has a frequency of 1000 Hz. If a listener moves with a speed of 30 mx8w qhiqpnw2 1i7(:hf/s away from the source, what is the frequency heard by the observer? (The sound sn1:2qhx8 iip7h f(wqwpeed is 340 m/s.)

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A police car has an 800-Hz siren. It is traveling at 35 m/s on ax cb1o74;s8x kb9i wnw day when the speed of sound th ;sb74o wb8k1ixx9nw crough air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change of frequency does the observer hear?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the frequency heard by a stationary observer when a train qhmlw5k f;a 6,approaches with a speed of 30 m/s. The frequency of the trh m k5wq6;f,laain horn is 600 Hz and the speed of sound is 340 m/s.

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling toward you at 120 km/h. The train blows its 400-Hz wg :; jdc k;1oxpo8;techistle. Take the speed of sound to be 340 m/s. What frequkcg;8 t1do;xjo:p; ce ency do you hear?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are moving at 120 km/h toward a stationary train stozayp o ehou6*yu(uy6y8wa /v+e1 7g.)c,l. The train blows its 400-Hz whistle. Take the speed of sou),ev+7 ( tg*sluu1 cz yy.oa6ah 6o puewoy/y8nd to be 340 m/s. What frequency do you hear?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling away fr./6od/tgk4 j7k aguoh 2/lxydom you at 120 km/h. The train blows its 400-Hz whistle/y7l k k/4dod. hxa/g2tu 6jog. Take the speed of sound to be 340 m/s. What frequency do you hear?

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81#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A train is traveling away from you at 120 km/h. It blows it10,mtbvzvahrcm9.0jeg r 1 9qs whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. Whatg0zjrq19am19 b, m e 0rt.hvvc is the actual frequency of the whistle?

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82#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a train horn is 8o-uw 9ps 5hse500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer ih su-5e8owsp9s moving away from the train with a speed of 30.0 m/s?

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The frequency of a train horn is 500 Hz. Assume then x 98+mtsxp/bu 7wj0a speed of sound in air is 340 m/s. What is the frequency hstm+ 8x an0b ux/97pwjeard by an observer if the observer is approaching the train with a speed of 30.0 m/s?

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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sonar is used to determine the speed of an object. A 4o9 t8case pf h- 4wrb.6*-9e;ks gwatiuil.x:0-kHz signal is sent out, and a 42-kHz s.iwxiwcs.4 8 --s9 obt9 :ptaa h6ef*e rg;lukignal is returned. Assume the speed of sound is 345 m/s. How fast is the object moving?

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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The half angle of the conical shock wave produced by a supersonic ail11urta +vt*wrcraft is $60^{\circ}$. What is the Mach number of the aircraft?

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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet flies at a speed of Mach 1.4. What is the ha ij i8xlc(ps*1lf-angle of the conical shock wave ix l8spi*(c j1formed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplane flies from the United States to Europe with a Maiujdlm 2 p)iw 9owzy5 rd )fhmo0//a2,ch number of 1.05 where the air temperature is hfl/ u2rip)omy/za) , wd90mjow d5i2$5.0 \; ^{\circ}C$. What is the speed of the plane?

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