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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 followiv+mtu bgy a(t -vdt+.(ng is 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 co65rff owiyef2j t55v :nducted fastest through

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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 sou0t, lemgy*5tbnd in 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 air incr5y;)a 4y m0,deg1 uh -rupuxlreases, what happens to the velocity of sound? (Assume that all other facto4u1;u,0a emy pxy)uhrgd5 l -rrs 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 400f*trd mov:h-l c) y4m) Hz sound, the velocity of a 200 Hz sound through air isdmh:t olfr ))* yvmc4-

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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 Hzqu5t)s) .i7 ;z vbmqxr3gmbw4x 4u )pd sound, the wavelength of a 200 Hz sound in a q. buwimpxxv )qsm)g 4br7;z5u)t4d3 ir 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 are calledphx2o5 xd2x a1+szk u9

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequen7b beln0o+ xnwhq.a*q+fj*r5 cy less than 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 ha ( - p;6;xryksyat7uuniformly in all directions. If you mo;y uhpr7tsa(k6x- ;a yve to a point twice as far 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 om fven(kz7*ms+58hx 5 xd8kcwaves, intensity is proportional 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 sgpzl -3ncqm 2.ource at a distance d from the source is I. What is the intensity at a distancegp .z -c3n2mlq 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 s:ni,5 ry-m*2jt hm jxnound source that is radiating equally in all directions. What happens to the intensity of the sound? It redurj:ynn m,hjm* x5-2itces 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 all d+bpo p6+mk(a4uqs/ e)tgm1zmirections. What happeempa /t+ qbz(gmkspo)m14u 6+ns 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 incroskd ase3n-*8eases 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 speaker emittioy4pci eiw3 1ww0*y, bng a pure tone. What characteristic of the sound in14cyy wi*io,wp3 0ebwcreases?

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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 musical note?.o tpcef( 1oo os+9 rq. ;x8zo1krk;sr

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "isq10yka *(kz5.)o ff v(pd f2z rq*jjpitch" 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 into u i+*ed*hapoh ;zim38 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 waves 8awf*9a 9tdnjare

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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 wave generated byysns i/c;/b 1f the guitar as a result of this vibration. /yc bn/ss1fi; 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-mwgi 6chzep u s5v90+ both ends, 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:v vi u4jt55.;tdp)g2gptlxfs1s 5 p s the wavelengths of the three lowest t p )t1i:v5gtvtpssd 4xp j .g55f;u2slones produced by 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 resonatlbia 4, bms*e1e in an open pipe of length L is 200 Hz. Which one of thamb4, *e1sblie following frequencies will not resonate in 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 res/ ad+ pufc+us o8e56ywonating at its fundamental frequency. Which statement oc+despuw 6 ya+/f85 uis 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 closedxpzy+23 1gvl b 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 lenre7 57axe16w3 ohbc5 ab5*hmpxl5j dpb:ug b(gth L. What are the wavelengths of the three lowest tones produced by thi5r1xh3 dbpc:l7a p56* m(ohgab5xje 5e 7bbwus 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 resona7.wfp*qwtoo2 wh00,khq b 1vmte in a closed pipe of length L is 200 Hz. Which of the following f*o0ov.7w,twh qbq 1k20mwhpfrequencies 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 closedxj 4( man;jod8 at one end is resonating at its fundamental frequency. Which statemenxajn ;djo4(m 8t 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 speak6nl ej;fsn ;wrgnv. /z.kw :a8n8a)akers driven by the same source. Each speaker produces a tone with a .n k;8k6n w wzn)8a je l.nfsv;ar:ag/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 beat7)xn uixi .-wc*y0tvu s, 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 particular beat frequency i w.b) 03+r7f qkqrqnl34 amemzs heard. What happens+4z0kflr. 7)qmw3m ab q3rneq to the beat frequency if the frequency 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 explap)ftts59 o rk svb2yps -,4.wyins

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source approachy++zwt3m (n xyes a stationary observer. The frequency heard by the observer is tnzw +yxy3(m+

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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 ey 05nv2it1jf s4m wa2by the ob 2m52f 0sa1vnetjiw 4yserver 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, itsj 7b s3c)fhx,1iodnk) half-angle will decrease by a factn7xd)cf31 )oj h, sbikor 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 ultrasoni m*,x7;zsrg: eg qdh9ic sound of frequency 45 kHz in air is 352 m/s. What is the air temperatureg m9,r7e: q;xihs zg*d?

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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 asz *vg q(plgq;47h-.fplx+)s*bcmf 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/s, a bat emits a shriek whosewwxik 6 )6ff(g echo reaches it 0.0250 s later. H(fxi6 wwfkg6)ow 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 4.00c4/nj1:m xh8jpwbhru ni bqqq o8)*i,w x.,t* 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 dio1tje:tjk:ofzp5g- z / t, 9bdstance to the lightning strike ttfjtk/gz:z d1 9o5,ope -bj:is about

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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 thb+zs y,j(lgyz7(*ei,n ox9lh e 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 deep well and hear the splash 2.5 s lategr2w uf15 k,siiwjp; 1r. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 340 m/s.5uirj, gs1i;ww p f1k2)

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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 frequency 500 )-*sfa0i 8juo1 *v(bljljmek 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 *c6 e8ufpj f+nat $23 \; ^{\circ}C$ 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 intensitygeby- zbn 942t $10^{-3} \; W/m^{2}$?

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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 souns7f nba0+y m z9e4lqm*d?

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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 ikhcy2yh2i 3:qntensities of two sounds with intensity levels of 70 dB andh2 :3yhic2ykq 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 engines in a garage is 100 dB. q2 vzs/ i*fx79i5he7wao(lhj6a) dxw What is the intensity level generated by one engino 6()ai* sflh2h w q9/awxi7vxejz57de?

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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 that ifs2 6aj-cbt4u.; 3; hky hziqgs radiating equally in ah;c; i.hta bjgqu426 yz3f k-sll directions 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 n pp11bw.1 tnka source that is radiating equally in all directions w1t1npkp. b 1nis
$6.0 \times 10^{-10} \; W/m^{2}$. 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 bpeezc g 1ra;s041j.klr ;drl-e uniformly distributed in all directions. What is zr ega40cpe.j1;1kr-;ldrls 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 distance 5.00 m from att+:p4o3er7e*k-a qj bfj 3-7uw3xnzav ig4v barking dog. What would be the intensity le bqo+kvv 7a ng- 3ej*:p 4wu 3t3trzea7j4-xifvel if two identical dogs very close 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 intensity level is 60 dB. W;f ozb0o,yc,k hat is the intensity l 0o;f ,zkybco,evel (in dB) at a point 2.0 m from the source? Assume 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 o.of/ v0 vmbd 07))a fk,;p*ux+2fjy bhaiwjg5.0 m from a point source is 95 dB. At what distance will it befd7j yb))xmg bv,k oa0phw j/*+ f0oa2vuf;i. 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 compl o)h/tnswvg7s0c-z:j ex tone has a frequency of 1200 Hz. What is the frequency of the zss)w0ochnv - :j gt7/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 yntr:8 ha,y3f,ojdv ( of an open pipe is 900 Hz. What is the length of tf (ynda,tyrv o3:,j8hhe 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 picr6j,tm/z 6: .r-yok:pecv pnpe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open n66p,z c-om ykve /r tcp:r:.jpipe 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 length of 0.80 m. Icgp1ec5z* 2d i/zcgh* f the velocity of sound in air is 340 m/s, what is the frequency 2**ic ecgzd1zh/ gc5p 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 iz9+kqa m-qk.ue k3ta6n a room where 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 ononv7b0lfd j2 ) ;cojd1ig*8.elg ,j x ybx0s+ve end is 330 Hz. What is the frequency lxg xfg2v. dlovjs)ec*0by b ;dn1087+oji,j 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 pipe closed on one end that will have jv fbz8q/o(( xa fundamental frequency of 60 Hz on a day whe/ zbv f(oj8(qxn 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 t;l ufrh 0hnij3l ;*6l ozh;0jihe 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 s 5wz9s cu d8/gw392/ou gr7phycp c.pa room where the temperature 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 when the sy5neez c96y2 wpeed of sound in air is 340 m/s. What is the yw6e z29ycn5efundamental 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 and the other is f-pg3:p-azsnp ; *miqclosed on one*: s -gifmpppa q3nz;- end. If the fundamental frequency of the open pipe 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 Hz in ailz 6v+w)g).sahaxny 5r where the velocity of sound is 340 m/s. Ho+ n.g6s)wva5ahlz y)xw much 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 side by side jr2 u5v3qh z k 9tuwr-y74ee:land 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 ur:q hlk-u25jyw7er4 zv3t9 eis 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 444nb9u n5mw*o nexwq+)l+qj* x i0az10e Hz. What is the beat frequency?

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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 a80 i mjqj,jwzbq-9c8 odrl,x ox-;vi- 550-Hz tuning fork to tune the frequency of a musical instrument. i z-wiv,dxj j;-x9oc8 lqm-o qjr,b0 8If 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 6h/pm ,am)6dz0 fbbaj( m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity b(6z)b/fh , jpdma 0maof 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 cavpc;z 1 h1ft6o, /wrx lprk,,x5vd6orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension otw ho5c zr,cv/6fxval,d11, x;r p6kpf 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 twic hbc1 9b0atr lb2jff(.e the speed of sound. The observer hears a frequency obfh c (01j bt9fl.rb2af

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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 H p) lj6ouaj: qf,:3ugh*j2hhuz) approaches a stationary observer at one-half the spee:f)g,: 62ju uqjhajhh3o*l up d of sound. 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 frequency56bge4nbhbkv6zy:8l of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340blzgbn:6h4 v8y5k be6 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 knpe,owe+.+m3;4uw4 kps cxhat 35 m/s on a day when the speed of sound through air is 340 m/s. The car approaches and passes an obserk, p uew;nhxp+k we+mos4 c34.ver 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 wdtfk*z/wyo 0t3 i-fa3hen a train approaches with a speed o d3w/oi* yt-tfzak 3f0f 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 train blows its 400-Hz whi3)d9z 6q b wqjh+j) tyx,nj6xkstle. Take the speed of sound to be 340 m/s. What frequejj)hnk)j+xzw 9qb6t yxq6 , d3ncy 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. The train b 2veymf3cf7a .lows its 400-Hz whistle. Take the speed of sound to be 3fe 7vy.3m2 caf40 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 400-Hz qfj kjm,xa bc 0a/..oz012c.ibo*z nqcu.qu )whistle. Take the speed of sound to be 340 m/s. What frequency don iq0ju*0am,. o c)zfk 2j/cb.q.zu.1qabcox 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-0ow5pp,ap 3 j,icwyr its whistle, and you hear a tone y3w-o,, pprci5aj p w0of 400 Hz. Take the speed of sound to be 340 m/s. What 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 trainxwa7sd ( ht4z53d rwqg1hze /yi7s9i ; horn is 500 Hz. Assume the speed of sound in air is 340 m/s9 aw d4sh 7s;zrqi7/51h(zxd ygeti3w. What is the frequency heard by an 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 trcs.x 4v3go5/n)bru wz ain horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What4 /.nc5)ws oxurg zbv3 is the frequency heard 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-qt3t.( uw)n0xdq qh-o kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is the object movixno(d 0 ut wqh3tq-.)qng?

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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 shov:x g 6thn1r-tck wave produced by a supersonic 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 id ftxmi0y q.xes-1h58 d.-gxss the half-angle of the conical shock wave forgmxdiq sy8 .xex0. t-1s5df h-med?

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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 Unimsta1+g(wk8ukd ( 5o vted States to Europe with a Mach number o(vs1kk5tugmo w+8 d(a f 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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