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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 is zcq4:y 8gtkr5. v) xuoa 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 tr6)wjpm*sx+d w s 6k-k(w9znkhrough

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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*tv9kym4zc/zn 7se)6 :wcd ka a steel rod?

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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.ai8+ m/0jokr7 i d jcy2j*jqt air increases, what happens to the velocity of sound? (Assume that all otam70j .ki qrijoj/t82jd+ c*y her factors 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, 59klq8g 4 d8o kduic*xthe velocity of a 200 Hz sound through a9l5d 48gkxqo* ku8i dcir is

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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 4009c7 29pkkw)xr)cb ygrk:h / ap Hz sound, the wavelength of a 200 Hz sound in ac: )ygkp w2h9kr79)kbxrac /pir 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 than 20,000 Hz arksy sj;169vfn bqf+a;e 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 tha: ;pxe) hpo)e g)zep2jn 20 Hz are 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 emitting waves oi/s*bw ,4,ki/vfgd iia1qf:6kg*bz uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sound wi1 igi,vq:b/fo/ *kg*ad,izikb6fw4 sll 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 proporty)/jgzf)8hp c ional 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 the sourcegx8+mww i).fd is I. What is the intensiw+wgd.8 mfix)ty at a distance 2d from the source?

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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 equallyl;y-;pgp b( 9kzst/yv in all directions. What happens to the intensity bkyg-/pztvy9; l s(p;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 equally in gab4;ri05c;gamlxo-jh o 3 ugup0j 73all directions. What hapj734;mco gjx ;ag up50uir3gl0o-ab hpens 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 increases as a sound beir8tttj(10)1 :2 tbd vveuyhgm0+oj ucomes 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 speaker emitting a pu3z.4+1mfmd nzq39mxb3qwz0 w si)lk nre tone. What characteristic of the sound qzn s+ 1kfzxq4mmnwb3)9w.3zd3l i0m increases?

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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 m50a fmrux1t:15 qpwjnc / 9nquusical 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 qi:l(ktc(6qvxld 1i 8"pitch" of a musical 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 air igkrjg0 fci*;y ;do 23o0m bhe+nto water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacesa nc 29-d1ricit.:ih ment waves 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 guitar string and the sound wavx7 -zcznw8lv-62 r+ owxcst4qe generated by thews6t7v+8x-wzlx2cq orn -z4c guitar as a result of this vibration. What do these two 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 ends, thereflmn: gyu * g2761wa8a3zhjier w:0kx

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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 ew:*2x3 8fmqeu+cemmyx(5a cwavelengths of the three lowest tones produced eqfc+* (a5:mu8 xwee32 x mmycby 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 opence)h)1xi -0 ii*8zh -tbxukkp pipe of length L is 200 Hz. Which one of the following frequencies will not resonate in the same pi ) u-ixpkc ) 0xie*zhi8b-tk1hpe?

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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 hbk nktp,0:xp dte0akw1101 aits fundamental frequency. Which state n0 b0a011pkk1t kpax,hwedt:ment 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 which is open at one end and closed at the oth7v39 *gruxb loer, 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. Wvd7ff0 6uqtx /hat are the wavelengths of the three lowest tones produced vf 7xd06tf/quby this 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 is 200 Hzk1 k5swkjrk; rd4q,j-pe ue-zm+/ ,iu. Which of the following frep,;irde14-sj-uwkj emu 5 qr+ /kk k,zquencies 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 atyd;d7g+ x65y* -pdjwlqed1t)x svx3s its fundamental frequency. Which -j6pvyd7;wxdx* tly3ssd edgx )+q5 1 statement is correct?

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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 driven by z,rscmj*t+) c the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when ts+,j c *)zrmtche 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, the two sound waervkgz732-tk n ,wp r.ves 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 particular beaua 8s t*1w afr/.bzu8ut frequency is heard. What happens to the beat frequency if the frequency of one ar tf*.a1b/ zu8u8wsu 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(/sfb g6kvmoya*1ir(m )wv; glains

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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. Theb -ayjxj-m )a ;e:ru4zog r)w6 frequency heard by the observer z jaow;-ju4a-xy))grme6:r b 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 from a stationary observer. The frequency heard/a 3d: ,tagd,fbtsr88u20w1 z ohyzje by the observer381 f dztgydwos / ,2aea0:tzj,h8rbu is

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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 harn: b) j n7s3:oguaic3uqw /f3lf-angle will decrease by a factoj 37oiwu :us:qgb ) an3/3fcnrr 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 souk nwxelvb:a +-9kf *+cnd of frequency 45 kHz in air is 352 m/s. What is the air temperatbwex: a flv++-k c9nk*ure?

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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 z(qe,c( dl l8 *pr;dvyof sound in air 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/s1 hda4 nhwi:sk 8gjo 2w/p+8 e(if0den, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected backpddk 2wswa8nihg:+i401 8nh oj(f/ee 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 im4ju.:yu0hy k; lph+nn 4.00 s. 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 after seeing a flash of lightning, the x s1fi:0 ktmeou 649sidistance to the lightning strike is 61 oiif4 mte:0s9u ksxabout

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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 cl;ijckew8w0 y9q6su9wiff on a day the temperature 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 /h/nw)hm h 5ax b/8nkjdeep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the vem/) jn 8 bawhxhh5/n/klocity 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 faa/h. t :sn5qarequency 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 ahlgh uk(p./ 2epd*j5ot $23 \; ^{\circ}C$ 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 a sound with ing4 j30ncwo )j4n a/rsctensity $10^{-3} \; W/m^{2}$?

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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-dB +ya+p6u1otfa+hs mc* 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 the intensities of two sounds witaov z-3+sqjcmt:sk x- 0h q8xb:y5g/gh intensity levels of 70 dB gs jc8+xo:t5ay: zxmvbh0 /3gsq--k q and 40 dB?

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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 engimp6/q tt8s 8cknes in a garage is 100 dB. What is the intensity level g/mktt8p86qsc enerated 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 of 6.0 m from a source th+pni m0qn8.d8oud, itat is radiating equally in all di+ n8.8pdio dn,iq0u mtrections 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 distancetchqq en,aem7*n)t1a 1 ajr01 of 6.0 m from a source that is radiating equally in all directne7jnh1 1a) qc*mq1t0re,a ations 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 delivers about 1 mW of power, which is assumed to bf:oq)fj l( ;pre uniformly distributed in all directions. What is thef;:pjorlq )(f 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 65e z e3r5-qu/jb dB at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very closee /-jbr zqe35u to each other are 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 from a sound source the intensityo mf1-j 8pm7cpq/h5s7dn 1bei level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? As517ji p1-8/ehocdbqmpnm7sfsume that the source 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 aptq sc4 (a(7ms point source is 95 dB. At what distance will it be 7 s qm74a((pcst5 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 cg5 4uuw;xg y.hmu;:o j p5sx w0j7rvh)omplex tone has a frequency of 1200 Hz. What is the frequewxomjr7u g5p:) h ;; usvwg.uj45 yh0xncy of the fourth harmonic?

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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 lpt,2zr d1o*pis the length of the p*po1d l2pr tz,ipe?

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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 rx: :x1:-ycvay rv w/ioesonate in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in /:x-xcyo:1 ywiv:vr aan open pipe of 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 length6uxrlxx3xcx6 q k9 d32 of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of the seconx 923lxdkxq cx6 ur36xd 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 where the te ynut wel.e55+c vf +-b+bhqtn2p r6g1mperature 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;f0 cdc 5p4cgvupgmu xtstu(*; :9w *c end is 330 Hz. What is the frequency of the thirg*tucws utxmc0ufp;p :c94; * ( v5gdcd 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 pipe closed on one end that will hy -m2not)wvhyv-em96 ave a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 m/s? etm9y--ynw2m6v)v oh

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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 the temperature d70 wv4wfazq1 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 tempemqe97 oh )o:d 82jilmurature 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 pla1ijqo 97-z bwuyed when the speed of sound in air is 340 m/s. What is the fundamentq-9ijb ouzw 17al 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 lenw8k2/ s* tsl-p5ucrl8w t+q:d s7rsength: one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the cnl-t*8desk rp5/2 us8 7s+tsww: cqlrlosed 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 emita js5ko)(lwc*4 zv8sil3pkt3 a frequency of 800 Hz in air where the velocity of sound is 340 m/s. How klwsi c 8)(p t4zsl35vj*o3kamuch farther back would source 1 have to be moved so an observer in front of the sources would hear no sound?

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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 z fn9 qnm80txdx1t52d tt,ft w- gjq,0side by side and driven by the same frequency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no sound, which of the following is a possible the distance from the person to the x8 n,tx,tm q 0tt5wnd zjq f9t1g-2d0fother 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 frequenkqq u;:g2l ,ecsaym:*cy?

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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 zxw8,jb71*ulc6 x dwaof a musical instrum, b7wx16 czad8* ujwxlent. If the tuner hears a beat frequency of 2 Hz, what 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 sounds produced by two horns are 6 m and 7 m respecti /(s28fvp+ pt1enf*lo riypdo(x:d w (vely. What beat frequency is heard when the horns are sounded on a day whenpd8rn: lpdio twf/( e1+*fsy (p o(xv2 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 strin1srinwea:go 16usq) 2gs on two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in us61srig1:ew2n o q)athe 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 twicx p32k0an 9mwip6(zbq n)+webe the speed of sounkz p nbwa+wb93e(mxn)02q6pi d. The observer hears a frequency 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) approaches a stationary observer aq:sbkwww +p:)2pmv..sl7g saakiq 88 t one-half the speed of sound. The observer heaq7 ww:+iskms8pa2k).lw v p.:bq8sagrs 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 325urkssg*4a am 6bfv/dtn 0wlistener moves with a speed of 30 m/s awasdtw*/2 ka v6ua4 3rmg0bfsn5y from the source, what is the frequency heard by the observer? (The sound speed 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 tj 4v,colc v)+83ujp 4 hxp.bftraveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along t c,ljp.38o 4p)f u4ctjxh +vvbhe 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 station t5taa,en 0, qoezht7p0ik 7lfayl)59ary observer when a train approaches witlaq77n0y,ftlaai pzeote0)h5 5 k t,9h a speed of 30 m/s. The frequency of the train 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 trahr;;ngv:k ed5 in blows its 400-Hz whistle. Take the speed of sound to : ed 5h;kr;nvgbe 340 m/s. What frequency 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 stati0wh . fi4st9gmonary train. The train blows its 400-Hz whistle. 9shtgi.wm 04fTake the speed of sound 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 from you at 120 km/h. The train blows its 40 zdaah duci(8m4 y2bj3pz/0 e50-Hz whistle. Take the spee jy20azhp 8ua3de/4dmb z (5icd 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/0guwp 2 tcq */rohqv.*h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is thewq c/gr **uhqt2pvo.0 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 500 Hz. Assume the speed of sound in ,gdh .m nh5ar)air is 340 m/s. What is the frequency heard by ah,ar )5hgn. mdn observer if the observer is 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 the skg iyyja+.eg*)iby02,; t hf xpeed of sound in air is 340 m/s. What is the frequency heajkayx )yhfgb 0+e,i.; giy2t*rd 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 40-kHz signal 1nehszvfep.7k8- ,fp mpjc3 (is sent out, and a 42-kHz signal fvm3 ppnse j1e8.h,czpf-k(7 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 supersor 27bd1 2pxbionic aircraft 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 half-angle of tnv jt7po9 rf(ls7)2of he conical shock wavelnf9s7(2f)voo j pr t7 formed?

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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 Europ8i/a (0g x g5qredqbj.e with a Mach number of 1.05 where the air temperature 8jdg/xb0 geirq(5. aqis $5.0 \; ^{\circ}C$. What is the speed of the plane?

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