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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 aj (q/ vlom73ii6/krw mp80en 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 co h32om z-l 3s1out0epsnducted 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 is jc:4xhv ut 0bup/9t7n 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 happenvl22yck)6k .b )iatmos to the velocity of sound? (Assume that all other factors remain constak. b yc2lok)ai2vm6)t nt.)

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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 veloclfvh -w2x)/i) 9bqls r;gs5kqity of a 200 Hz sound throug/l 9hx gq ;2)vs-5kq)isbf lwrh 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 v.v2hs;d uea12phdz- a 400 Hz sound, the wavelength of a 200 Hz sound in dhpsv1vu.ha;22- d ez 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 wit5 t)sps . hvl -kp/dj ,qmw;/-ncy8vdwh frequencies greater than 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 are 7(x( 7ujkvkkg p/iu x1called

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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 shrb;/n.5 qas ti)o* iaosn6ttjp*f);ource is emitting waves uniformly in all directions. If you move to a point twice as far away frstb;n*6ap hi/s*noqi)5; f ttor. aj )om 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, intensitytcw8+q,4+epyk -q,mt i2*aysream1l 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 :kiq;4oc +tclthe intensi occk tli4q;:+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 equally 2ex7mpwj u7h /in all directions. What happens to the intensity of px7ue 7/h wm2jthe 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 sourc48rrz (hpp.ibg.)8h ln3 bi hde that is radiating equally in all directions. What happens hg .br4h n 3i8hz8p(.d)bplrito 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;q/q6e oy1 n iczk84xk 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 emifyhd-( zctm( c3ouj 7:ujh-. itting a pure tone. What characteristic of the sound indcj.j iy-(zh-o 7uuhmtf:3 (ccreases?

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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 musicalohg*(l 0r z ts8zw6pb7 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 kyj2wor/cc d1a/;-anmusical 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 iaih+ v ;j:iohmp,,zf- 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 displacement wntn6w /a.2y 3tjs6.n 9jbvg yfaves 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)tqt - wsm2lw/ on a guitar string and the sound wave generated by the guitar as a result of this vibration. What do these two waves qstt - wwm)2/lhave 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 endsrzkkgb,yy ;w72c 0 4af, 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 of06g x ouoid5ki .rc kz..4a*tq length L. What are the wavelengths of the three lowest tones proo r0gukqt.zad6ii. .45ok* xc duced 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 200gs as/s i8 1l0rv1ck)gz.y8sd Hz. Which one of the following frequencies will not resoas)1z0csk/ rg 1ssy8i 8lvgd .nate 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 fu:d,xp9q ikn- dps49q hndamental frequency. Which statement is corre4hikd9- xsn,qp :dq9 pct?

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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 atyum6z4ry2 q4tj a)hzcl/6i 6s 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 thrdt,hd2bo mes4ez- 6k3 ee lowestdeed sbz,3 4h-mk2o t6 tones 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 of length L is 200 Hz. Whichly;f47h3pl51dq kd mg of the following frequencies will not f41mq 3pld75 dklh ;gyresonate 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 fundamentazf rn:9 r6*vt p)s-nxsl frequency. Which statement is corrn fv nx)sz :9t-sr*pr6ect?

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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 6k g y e t-fl6vu0f;x+x1ikq*aspeakers driven by the same source. Each speaker produces a tone with a frequency of 2uvx-60+*i;fx k af1yl6 eqktg 00 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, the two2psf3- ;y ejtesp,w 2n 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 togethn:m ,zsr.- / et/ddyiker and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the tones is inemd/k st . :ryzi-dn/,creased?

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Doppler shift explx-i5f iy9c t+0 (fkvahains

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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 stationn dlx(7v/p./pmx ey8r ary observer. The frequency heard by the observer i8d( /vxx.pyep7m lr n/s

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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 freque3 q6( : +eno:/weynsjp3jmobqx7 l ;qvncy heard by the obsero3y(; oensq+j3:bn q/m7w6qxvl: pj ever 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-ano+n+l xq(klzacy i 1+n;vk /2igle will decrease by a fact /2ak ++ il1xqvi;zloyc+nkn(or 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 3lzmvh44xzn is6j/ (7urw w35uulu0h )52 m/s. What is the air temp)0r4u 4653h7wu liz(xznusw/mujh vl erature?

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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 g5 9nnt *l3dwospeed 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 airu2rr73 t xz6ef is 340 m/s, a bat emits a shriek whose echo reaches it 0.026rtux73f2zr e 50 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. T s(5m am1 8 /mu07*bc0ppigteujpdcf. he 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+.0 nfg)q 7)yi c dc/yxyjdad/ of lightning, the distance to the lightncndf.dc0yqda/ 7)jxi) / gyy+ing strike 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 iozq8ls-2.d 8 g0cmsf es $15 \; ^{\circ}C$. 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 hearsrq zp9yg* 23p the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity ofg9q2ps p *rz3y 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 9np)+w3 wxrpq 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 airwp2ecvj ./(ejog h4e;+9v tp o cnv8g, at $23 \; ^{\circ}C$ 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 intensitng m k1aq0i0e;qi9y8nrasa :1 y level of 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 bi3x.yb +soy-y:/ afwl6pp s2a 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 of two sounds with intensity l8 dvm;g gm2bq*evels of 70 dB and 40 dgm bg d8*;2qmvB?

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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 gr/,(bfzk mca8fp;. k the intensity level generated by kmcb z(k/;a8.frf g,pone 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 that is radj9 ),dcf nnd-wjwx+8eiating equally in all directiojdcx9w nj8fdn, -)we+ns 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 ofzv q 4sg3qh,r9 6.0 m from a source that is radiating equally in all directions is93hsvq g4 rqz,
$6.0 \times 10^{-10} \; W/m^{2}$. 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-thne -y) hps m15;ovj is assumed to be uniformly distributed in all directions. What is the intensity level at -so het nm1 yj)-h;vp5a 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 ebm -hs7a 4yn-m.yi(t at a distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close to each other ar4em- -nyihmt.7(bsay e 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.n) c-6yjzm nvzwg+58uls 4 2hr What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all directionsnv+6yhg ruc lwnm 845)2zzs j-.

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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 onb5z4m jqb ,-5jyh q-a point source is 95 dB. At what distance will it -4n5 ,oh 5mqj bzqyb-jbe 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 Hz. Whatomrf1d7*y sc, is the frequency of17f*odscm, ry 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(, j+myzgq6/hzq; :iooa v(g ubr/9kd)y7xml 900 Hz. What is the lengthlr/(g:9/ , qk qdm+7hojy;b6i()mvg ua zxz yo 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 length L is 400 Hz. Whatkdf(p*6k t.xj is the frequencyk(p.kdt x6 jf* 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 length of 0.80 md3xy bqz k xa+5ysyu n+(z-x mngt .k47ind(8+. If the velocity of sound in air is 340 m/s, what is the frequency of they5d(bq yum(k s 7.8 yz-axk+g zxnx++nnt4di3 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 :;p jdpm-s+vj 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 endh: cshhq,lj+u a(c50 a is 330 Hz. What is the frequency of the third har lh a,s: ucj+05hhacq(monic?

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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 havf 5rri+jo7 yc0e a fundamental freyc7of05 +i jrrquency of 60 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 the c4ewt 1* fp*/hfgu s.xcvk 2u0temperature 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 roommgjp1-d i4 (twzk; cj; 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 speed of sound in aj4)fom.)w * kkfghddxv42-iul5p8 ob ir is 340 m/s. What is the . 4ixljmb d)god42hpw-kk*8 5fvouf )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: y:b5. (e3ofllug : qfqone is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundament(fqq l3 g ebufy:o:.5lal 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 frckvg)aqr,d)ke; -/tb- mxm* oequency 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 xek-)c;madk vg-/qrb)* , tom 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 drvz,e5 6+g3 kch sy1tmbiven 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 s+ ,ghzm be13tc5vky6distance 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 frequen7p/ngd0pces 3 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 of a musqs zj 919-x pi.+f g:dc*ajgvyical instrument. If the tugjv-dz asiyxq +*jp9.g: fc91ner 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 yoec5 qb*+su1:wuze(ms 1t: a respectively. What beat frequency is heard when the horns are sounded on a day when the veloc q sbc(es u ty+::u*e5omz1a1wity 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 iwan ,*6m z3x(kavt6 rjn 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 tensio6 axk,rvma6(3zt* n jwn 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 stationakvy4 78j nw.fv)-k; k9lex bmmp; ptr)ry 1000-Hz sound source at twice the speed of sound. The observer hears a frequenprkvb) m 7vkp m8w4e;j9. xlk-fy;)tncy 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) a((pwdlv1frbo *ta wr )di k-:4pproaches a stationary observer at one-half the speed of sound. The observer heaki1( dowrl):a4w trf-(bp*vdrs 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 li8polvuxlp( d8/) w d5qstener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is lo)88(up vpxd w/qld5 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-Hz7 i ;3r3vhm8vndoec.f zc+k /g siren. It is traveling at 35 m/s on a day when the speed 8rc ; .v o7eg3+v fcn/dmh3zikof sound through 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 ay3hwe4+d5o/1pay mdh train approaches with a speed of 30 m/3+ya4/dohwyepm h 1 5ds. 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 whiyri0m0l8vhbuu * 0xtjhu 5c -,stle. Take the speed of sound to be 340 m/bvl5 ,htu* yix0urhmu cj08-0s. 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 stationary train. The train blow+m2qo8d(w 9i7f,jl qo:po bkds its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do7q ojw9dq +:k 8(olb2dipmf,o 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. Toa*ju( x ( 5lihysa8a:he train blows its 400-Hz whistle. Take the speed of soyo *l (j x(as8i:5huaaund 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 i15*r; 8yrhuy or gvu4yts whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual frequency of the wo*8gvry u5; y ury1h4rhistle?

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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 s4 5j,5qjjgfwbkv(e:l sgq 8*kpeed of sound in air is 340 m/s. Whaefjwjbqj5s5k4*8l,gg (k qv:t 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 train horn is 500 Hz. Assume the speed of sound in ai,,t k o)2q9+sb 0xfhikd8r :;hcysl05fnm odmr is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train with a speed of 30.0shdh;5lkf 92n)+0t0mco8fqo,k ib ,m dy x:rs 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 rpq*3 /yw i:*7 7ju*kolc kvyt40-kHz signal is sent out, and a 4w j**q3pyr7u:k*lcoky i/7tv 2-kHz signal 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 si wpru vncmx48 ,mm6m+/i 2- 0imd9luiupersonic 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 the conical shock /hj.8nahqf*/necebregj z0 hr9+, 181dfi c a* eqh8/ an8d 1crczjj0ifen ,h+f rh.gae /b91wave 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 yr:lr 5dphvh0u2/1jzsbp8 6 afrom the United States to Europe with a Mach number of 1.05 where the airdhyprav5lhp/: 8u1 zbr0j s62 temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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