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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 a+cx q-i 8.jk, kwb 0ef9qttq(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 conductg / r 2 di 9wuzs.:oixeeht0w*qn za3iw8;zf*)ed 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 sound in a steel hgu6i0tt9d.p 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 iy( r2rx/de 18 b(6tvby7gzqwthe air increases, what happens to the velocity of sound? (Assume that all other fac/z6(yiq1b8y r ewt r(7g2b xdvtors 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 pah3hrrd2gs()w8s wi+ tiw.0of a 200 Hz sound througi30rs +ihd8)t .2(prswgww ahh 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 wavelei9fy,o n 00q0m jc+jbmf ltz61ngth of a 400 Hz sound, the wavelength of a 200 Hz sound in aizj+jic0b0f1q,m6f9 0y nmo tlr 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 callm 7mx0uux6. fded

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frequenz3* qkns hd pp:f*:k*tcy 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 uniformly ;rd*sv ;)*as wx.y nutin all directions. If you move to a point twice as far away.wa* rsyv n;xu s;dt*) 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 wapek.wl vrka+gq f67 8,ves, 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 source at a distance d from the sourcf4zxm+)d9d dd e is I. What is the inten4z)x d9mdf+ddsity 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 rfx/c)fssh .r.un ,gz 8adiating equally in all directions. What happens to the intensit 8g/n,rxu.s .)ffc hszy 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;fpanuyuq+ rlit+ )9 , from a sound source that is radiating equally in all directions. What happens to the intensity level ;9u+ytf+qap nr, )ilu 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 b1d5hplfm2op ah / bgj:g0z +ydl;q3;zecomes 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 pure tone. What characte0ns q*7ks,;qi1o y.s/qd lz pdristic of the sound increase d7so0.zpsqql,nsdkq y *i1 ;/s?

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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 a3yif+cyo1/nbkzib4-v x:ra n-g.h0 h 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 musggcl)a/ jd gr -**gl)1qm2uig ical 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 ) 8 /zuy 1j6dq s5m jg(1pyzf1vnbvf2twater

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemem ;lgy5wt)z*;do6n zent 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 st /swddxz 70yd)ring and the sound wave generated by the guitar as a result of this vibration. What do these two waves have in x/0ds7dw) yd zcommon?

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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 e56 e*wo-h p/atif0(w w 7mbzegnds, 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 p-xoh pm;s-*w the three lowest tones prpsw; xm*-h-opoduced 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 lengw 1w0u jf.9nwb7zv9bjj36k kapl 2ix2tc/m:b th L is 200 Hz. Which one of the followinj jx6j91 t0w kb932z.2a b7f/p b:nmulc vikwwg 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 reson si:r+sg b.a-0:djx4 qom,ziuating at its fundamental frequency. Which statement is correct?j b:s xgr 0.us-aqmi +:odz,i4

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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 onec yzs qb-*,(z*kg7zmgg en:7r 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 pipeyjriht- 9t 3j0 of length L. What are the wavelengths of the three lowest tones i93hr-t0 ytjj produced 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 resonate in a closed pipe oftt6eoz* f 0efr/wzs/2 length L is 200 Hz. Which of the following frequencies will notfo f set/ /2w0*zezr6t 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 funlnabc4vo33fvxwa4 :: )on fr7damental frequency. Which statem: fv4nolv : bao7r3cxnw4a3f)ent 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 the same source. Each speakx5e4 nmy .cjpgv*53im3c dfs)er produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. ymsx 5cmfc*3gp3 ).jn ive5d4 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 soundq)(dmqfh/1+r4b :g y wjkf8hi u1qgs5+etjt; 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 az pbk1(dtp.z6e (4umy particular beat frequency is heard. What happens to the beat frequency if the freqkz4utmyedz(.(6p p1b uency 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*czpuawp b7li( f)h) -lains

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound source appro2 7is(3jadz-wxcwmd55frc. jaches a stationary observer. The frequency heard by the obse3-wf js7i(5jr5cdda.w cz2xmrver 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 by the zyxzlnn)6qy(u, , kxb c;*jmr ./5xhcobsb x, *.y nzhk(ny5lx j ucz6,)rm/cq;xerver 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 to2c-9ap-(jgyr r qfx2c9gqu g4 double its MACH-speed, its half-angle will decrease by a factor qc f2xa(rg qyrp2-- g94ugcj9of:

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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 ultrasn (f8 6wopuff9onic sound of frequency 45 kHz in air is 352 m/s. What is the air temperaturenfufw p9f8( o6?

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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 soud rnt z4g/(l4and 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 pjb-fkceog- 9rv /;0x of sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away was the object that reflected back thk j-vxf; 0-/c9 epogrbe 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 xzf:6 pf1:ogl kf 6;yytemperature 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 flcl v-1t lx:kuwlw.z76ash of lightning, the distance to the lightning strike :v 7ull6kx .c1ztl-ww 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 the temperature idc/56mvdsb .v7 gd vc4s $15 \; ^{\circ}C$. 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 ak p3auw7 0pz 7aq/il0hk hg0 ;fogf.l0nd hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocit;0k g /7l0hug7aahw3 . pkp0of0fqizl y 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 ofhnnv9 19x( q7dceo.qs a sound wave 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 5fjdk+m ytj:u o6 w-r*$23 \; ^{\circ}C$ 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 ig9 zti 8/j+xrzntensity $10^{-3} \; W/m^{2}$?

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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- 4rzv23 /tfvyd,cjo t-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 oxpc6 n-;a/nvj uu lzx88 82torf two sounds with intensity levels of 70 du8 l c;rna8x-6nuozxjtp 8 2v/B 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 engines in a garage is 100 dB. What is th3y0my1 v)sm ut57hypie intensity level 5t uvmyi 1m0y)y3s 7phgenerated 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 distau/o 6f5w* k su:kwl/kznce of 6.0 m from a source that is radiating equally in u 5kfo /kzskuw:* l/6wall 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 j jt40a31wt7e,kxvqmy4vu 3 l of 6.0 m from a source that is radiating equally in all directions74 1y x3mtjja,qvk3etu lw40 v 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)o4h xe5jhof3 assumed to be uniformly distributed in all directions. What is the intensity level at a distoeho x5h4f) 3jance 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 a barking dog. x,hmr;clq- iofl-47 x+zad /gWhat would be the intensity level if two g7x,d+ il c-qomfla/ ;4xhzr-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. What i vqr/vay ),if0s the iv)ar yi ,f/vq0ntensity level (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 5.0 i,7x5gs 0blec m from a point source is 95 dB. At what distance will it be 75 ls, ix 05becg7dB?

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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 com 3md sskhf;-bv3v51 mlplex tone has a frequency of 1200 Hz. What is the frequency of the fourth h1vk;bml 3hsf- m5vs d3armonic?

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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 is t f8 -+ /hs1ajib iiyltbq2kh68he length of the piikb6hts+b8fl -ijiq1y2/8 ha pe?

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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 length L is 40sq 2a+kud l00)cuav 8g0 Hz. What is the c)sk0q2u8av0l+ a dugfrequency of the lowest tone that will resonate in an 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 lengthd hwd7fvgwfkaz,- r,ou25r81 of 0.80 m. If the velocity of sound in air is 3or5-2dg , w,k 7 a8uvffhzdr1w40 m/s, what is 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 vc:zmavb:irq3i0ad4-z0s fw .5 roj4$20 \; ^{\circ}C$. 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 pip,z30l7-zvabt.c ejn1xkf)m oe closed at one end is 330 Hz. What is the frequency of the third hko)e10z f bl cmnt. x-j73v,zaarmonic?

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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 .p:divi*r+ ecshortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sdi:* +vepcir .ound 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 temperaturjgxn53xi 14i le 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 temperature isl,52q0exbb84f jkan7ls1i r x $20 \; ^{\circ}C$. 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 mkvak (g3-wr bp9.yym : is played when the speed of sound in air is 340 m/s. What is the fundamental frequencmb3gy y.vr -ka wk9:(py?

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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 theu*/ z9 2hha6p79nyrb re59snkwo pj )w other is closed on one end. If the fundamental frequency of the open 9 bpnou*w 2p r9en w7zsahky9h 6/j5r)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 sources6hn a k-/aos:cl86 h*idi9gpv each emit a frequency of 800 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 sog8/*a9ho vi6nkc p:-sh dila6und?

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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 sideyzg3ya;yyr * (*nlqw5 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 foll;g wr(azl3 n5y* qy*yyowing 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 bpq 9;u q.ylz1rw- ai/jeat 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 a 550-Hz tuning fork to tune the frequency of a musihu 7wy u.j , 8wl;-buv()plzilcal instrument. If the tuner hears a beat frhlwvyj;l ,. i(7pbl zw u)8u-uequency 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 -vp r9bwdaof;; ok9/e two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day 9 d;fovb / epark;-wo9when 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 i gs3 ux8g.-a/j nn mhbsq3m+2un an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage change in the tension of one of the strings would bring them to the same freqa+unn3x 8s-uh3gmbj2m/. gs quency?

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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 stationcp-a ffq9 3k3 8sw t2fgn6ems*ary 1000-Hz sound source at twice the speed of sound. The observer hears a fre8cqpwgmf*693f a f 3nsk2e s-tquency 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 1qf ,bk0iqk2vo6(u 0,6gmdeyr 000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hea,0fq,g b r (q0u6yveimdk6ok2rs 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 freque/ aeq1eqvf,0 ancy of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frfe,v1/ qae0 qaequency 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 traveling at 35 m/s on a da6f:w;ca ;co*uooj/iu y when the speed of sound through air is 340 m/s. The car approaches and passes an observer who is standing along the roadside. What change/aicw6juoou;of; *: c 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 (ev ql r)yqf9 i5g(fmp:ulm4g(z3n 2dwhen a train approaches with a speed of 30 m/s. The frequency of the train horn g9f4(l)veigu((5mm nf3z r: qpql 2dyis 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 toq -t1jwm(yua blc. ()k- r2tptward you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of 1c .rpla2mb j)u- kt (twq-(ytsound to be 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 1208y4bg vt2m cp;2 zy,yz km/h toward a stationary train. The train blows its 400-Hz whistle. 4ty8 g2zy ,ymbv;cz2 pTake 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 400-Hz5j7(dhd a2bj f whistle. Take the speed of soudfa5h bdj(j72 nd 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 atra0zc4r(s tq **b82 26wh zu eaflybt* 120 km/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 the actual f0far*h84*sq6er*(ttbw uc by22 lazzrequency 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 /ds5a it,8l,je.nc ec -fdzxxm6;;fd 0hjtp6sound in air is 340 m/s. What is t zd.ld ,ex,ihm;/ jt8es;f 0 nd-axpcjc6f56the 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 train horn is 500 Hz.+y 7cpgyyd zwz sg7.7. 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 wpzgy y.c 7w zg7+.syd7ith 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 sre3fn1 f4yf/i v r*vj8c 3xdf;peed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assum ;dc/3ifvxreyf4 3 1fn r8j*fve 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 supersb(cw 2olloc1 c/b7 a/lcp.hz3onic 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-anglee h0 qq/ohw.3xu*c-uvqx4bk( of the conical shock wavx o(-4 x0bkh.3q*hvquuwqe c/e 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 th)y+ar 9yik,poe United States to Europe with a Mach number o a,)9okyri+p yf 1.05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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