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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 followin7)el8h mwq h4)ff/febg 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 conductei ugob z6hulse r804r rke);d93m)h:g d 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 sounds tfnim/z4+ e3 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 increases, what happens to the velocity of sounixd( ix lyp7.;d? (Assume that all other factors remaii7xpxi(; d.l yn 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 in hcm nx+z,b;7ob5h2velocity of a 200 Hz sound throunh7z,bco5 mhb; +xi2 ngh air 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 400 Hz sound, thej rbi1me:davzx- 9rng qu.m)4 p8) j4w wavelength of a 200 Hz sound in air isdvi u.4m)jzg q -e): 8m nxbpr9wjr1a4

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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 k ylx rnigs)26;8)vw oHz 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 fre3c9trqr;pweim,3tv;g vtn g/a* 7o y4quency 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 bw7dw*do,b*bgxnfk+tq l)pjw 5o 4-.pigv8 5 waves uniformly in all directions. If you move to a point twice as far away from the source, the frequenipdl5. xof *-pb kw5n 4*+8d,vqob7bw gg )twjcy 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, intc fjm0; 2zc54/hb4pdo+ xomjt ensity 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 source at a distance d from the source is I. What is/6c xe3 y2ls*ggcacd0t4pik5 the intensity atp/ie sgy d g6*cc40 a3xltc25k 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 equally in v2t;nxtrxlk 8ys al-sttgo30v1 9(9p0cb h*rall directts10t9- bovg s8t2k30 * ha rct9yn r(vpllxx;ions. What happens to the 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)vk 69ljse csn7c n*r(ly in all directions. What happens to the intensity level of the 7 n)n(*l 6ckjvs cr9essound? 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 becomes loudy/qc -.j2z9fs7hbt , lmnu5jaer?

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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 pure tone. Wi m3 v/d ynwhiu-b((g6hat characteristic of the sound incuiy6(miw3-g/vbh( d n reases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudne5- mkdo.z:vhj 2 eun8jss" of a musical 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 7r8xd +un ud15-stqubmusical 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 int,+c1dp 0w q5gg;kwi rvo water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacem im.a6.bp) en:g6c zzey6w)jhent 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 an czbg 3 uut5ht..*unqx/v9om5d the sound wave generated by the guitar as a result of this vibration. What do these two waves tu*t3 qcnb.uo . m5zg 5uh/xv9have 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 bbk61hjx2 4 k9ukcsy.soth 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 the wavelengths of the threjwj 9wo 2e+csy ywa;snl92x+s+;u g9ye lowest toneus + ;ngj yc+xjl9s;9oww 2sy92e+ ayws 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 resonate in an open pipe of length L is 200 Hz. Which oi/0:t bqer-* fb7i)mtm he 7mcne of the followbh7erm mfe7 q)bitt i-*m:c 0/ing 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 resonating at its fundamental frequency. Whichvtu* hug1;/+h(dbe ia statement is bgta+1(v*ue h;ihd/u 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 oted( ny.unr *2dher, 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 wavel, lhj pkvtw8q55f0t (bd4gv/qengths of the three lowest tones produc5dqv5, k0w(qflthb4 t/jvgp8 ed by 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 resona(zou7o8iei 0if3t mgd;d :k)hte in a closed pipe of length L is 200 Hz. Which of the following frequencih8)ii u zi0dfmk : deo73got;(es 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 wu wa*xxdo7x -x./bceag8k/-its fundamental frequency. Which stat ae/*kwxx-. co-ubdag8xx7w/ ement 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 bitb/zg2x:c9 by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the /zicxbg:t 9 2bspeed 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 waves shoul:m*jkbxe39ubqs 49d sd 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 freqck +* d*p(w ui 8f1wnl;gkoo;duency is heard. What happens to the beat frequw+;(d*pf 8d col ku iknwog1*;ency 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 expl pcx1g0k fx)v(qs ehdd0:6wca,gt8u )ains

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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. Tha60 gy:lflcom*r843. ygah ihe frequency heard by the observer ism0fg :lolrh8a*g4 3ci6.ayyh

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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 frequen u-sghl oy rt1ao*0stro,;c,8 c4k,lgcy heard by the o 0;ohcsrksyt rg,,gu1,clt*lo 4 a8-observer 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 half-angle will de7a+b5vl1 )pikmf ur t9 ,kxe:ecrease by a factox 7k1eair+k9f5me pvt l) ,:ubr 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/s. - * zq/myb.,jogas,ar What is the air temperatury-,/ .qsmaj*baoz,rg 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 w6;);hvdqgdr tz(.hq the speed of 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/s, a bat emits a shriekj) .tl2tpw/jx whose echo reaches it 0.0250 s later. How far away was the obj.jtlj2pwx /)tect 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. The tempe;l,pl kx5ym0 urature 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 distance h /) wm5hx8gh:u 9 4jqmdv/igato the lightning strikm hau/ghji4m 5)9xq:/8gwv dhe 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, nfuv 14julo h:lyl,g:kzi5v6 kpl,; cliff 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 intb/a3 almj:x b s,z-q 1vp0zwa3o a deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocitx:l3 / aa0bz,mbqsw jz a3v-p1y 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 bl u 6m.onqxa/a,+;eswave of frequency 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 at q7nj f, k l6ov/lv19oq;whtwta .v61g$23 \; ^{\circ}C$ 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 gi:auf ) y)*/ibvtqp.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 o x:(s5aw4pxb zf a 70-dB 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 ed (;gcj3pn1iz4va q( of two sounds with intensity levels of 70 dB and 40p4z v(iq3 c;de1jnga ( 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 garaaqhqa oo+j/8w6 nd) yw63 dza9ge is 100 dB. What is the intensity level generated by one eaa 3q6d+)o 8zadh9oq/y jw wn6ngine?

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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 souveg ky.*n1 4avk4ui9xrce that is radiating equally in all dxig. kv1y ke*n a449uvirections 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 1en0bpb- fie6 6.0 m from a source that is radiating equally in all directions e1p -bbnfe6 i0is
$6.0 \times 10^{-10} \; W/m^{2}$. 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 m5b+)i5mpm jpl7i *gp gW of power, which is assumed to be uniformly distributed in all directions. il5m g+i7jpgb *5mpp )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 distance 5.0or zd ishfr ;7bk/,.(9sl-;ps-uq oeb0 m from a barking dog. What would be the intensity level if two identical dogs voqbss/r-rekl.bo -h79iz; u ,ps( fd;ery 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 sourzclkq+x, 7f 6gce the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0+,kcglq 76zxf 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 5.0 m from a psl,4r x.elm58gpri +moint source is 95 dB. At what distance will it be, 5m.rllgei xs8 mr4+p 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 frequency of 1200 Hzqzeg )l;r( n) :c1aelb. What is the frequency of the fourth hr c)e1l (l qn)be;gza:armonic?

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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 oz5pejc y(m3 )q7ea. vnpen pipe is 900 Hz. What is the length of te(j. 3ycna)pzv e75qmhe 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 leny3ombu7:m :vs gth L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open p7omsum:y: v3 bipe 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. If ther 8 -w lpb,jg.ho-f;dk velocity of sound in air is 340 m/s, what is g w- hb,prd-fj8;o.kl the frequency 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 where the temperature is ;bi2hssn55. 2,wgaqm b h lrp8$20 \; ^{\circ}C$. 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 pipl.f2(3 mqo rome closed at one end is 330 Hz. What is the frequency of the third harmonic?o2 3lm qo.mr(f

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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 5 n7(ak4c dkas0 )uvkxhave a fundamental frequency of 60 Hzxn5ack) v40 s ku7k(ad 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 the temperature is3xxxrhp *3;w sbb*9pa $20 \; ^{\circ}C$. 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 ()mzyfcj/3v ila9mdac *)ce 32 dc6tqthe 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 lt)bxyv y ay:jb)80az13f1 3hr1qbruqength 0.75 m is played when the speed of sound in air is 340 m/s.tbaj3by xf )buq) 8y301zvqyar:r1 1h What 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 and the otherz 8xf4e5clw +k is closed on one end. If the kez8l4 + f5xcwfundamental 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 800w8kg7 f*mkcc lte*to4/vt2x6 Hz in air where the velocity of sound is 340 m/s. How much farther bax 8t4/ ot7l* c6ckv2g*ew kftmck 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 and driven by the*p+/ahnsvwi4fx h;; n 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 other s4xh *nh /wfp;;+siav npeaker? (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 frequenk;tt : )x)dvw1bp/vn++g asfo 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 totzkrq g )91s pt-fl5. .8igurf tune the frequency of a musical instrument. If the tuner hears ai1-8rtr pkgs g5zu.)f .9lqft 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 pr i 6*ckg di76ahshxi)2oduced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 340 m/x66 dhh )ii2ck*a si7gs?

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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 fo856bix;0 3 e7 kl ze 7a0xpcywrq5ibwwund to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What p3ezxkwl bpw7 758qaxw i5 r 6;00ibecyercentage change 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 t9mxf- hwnm7+ fhe speed of sound. The observ9nf +mhf-wxm7er 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 2 vka+dt 2qs1xstationary observer at one-half the sp1q +sadtvk2x 2eed 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 frequency of 1000 Hz.ac7ifu6c1( 3 ,cywsfc If a listener moves with a speed of 30 m/s away from tfcw(63 7u,siafcy c1c he 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 trave1po iql.rf0u3+e t/- e)fgugp r ra6/zling 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 alurg tr06 p zef/qei3lr-a./fg)p 1u+o ong 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 st b;5on9vfb/hn nb2; 0b 0nr3zwzvd hv9ationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sounw2/zn5b 3f 0or;v9bhn vh0 ;vn n9zbdbd 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 trafiskk)7 8okrw qz, ,f*pj7cd7 in blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do yoodw q)kr,j7 7p,7sf8cz*ikkf u 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 blows .;q+4w b 1hkxk)trunev 9m)byits 400-Hz whistle. Take thee)nmky; + 4.v)h bk9bxr wqu1t 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/vz/z:)x vozzfy: )jb blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency d b vofzz)z)v:zj/x:/yo 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. I,q)ho 9n2 jqgc0y)em kt blows its whistle, and you hear a tone of 400 Hz. Take)o9ng)jq 0mk2,qh ye c 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 traiw ram-3ba,h -in horn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer ia3a-, -brhwmis 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 509y/1xg 8j)xcfa ig)f k-f8jza 0 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed ) 8jay axggz8f/kcji1x9-ff)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 is senvfn t-8inny ;:t out, and a 42-kHz signal is ret:yt ;f8 ni-vnnurned. 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 producu+h7 h ;wpsrg/ed 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. e,u63gitaead cm)n1kg0q . mo5tz.i9 What is the half-angle of the conical shock du9m5cn,o3g0 g. mk 1)taiqa6zei. tewave 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 Europe with vy)( tntxlb9 jbjs807 a Mach number of 1.05 where the air temperature isxj v l70)byts (bj9nt8 $5.0 \; ^{\circ}C$. What is the speed of the plane?

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