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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 false sxsz4e)+l / kwttatement?

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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 fast3wix74 o)futaest 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 48aj0hr oy- a*r6tb wnsound 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, whatbm6)wxkqij::zu :+mr happens to the velocity of sound? (Assux: jbrm :+qu 6)w:zmkime that all other 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, the velociawhh bhf wm .eqd;0(+:ty of a 200 Hz sound throug+bf; whdhh m:ew0q(a .h 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, the wavelength of a 200,aul4+u mlgsza8l ,b. Hz sound i ,l,a8+ .zbgusul4m lan 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 with frequ2 jggh4q )i(qaencies 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 208/pt+fmg7i b2e-:0nq .yek;mhomfz l 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 in all direcmx4q ggzdy)p1/5uq c2u t/dx1 tions. If you move to a /15um cg14g zy)u x xtpd2/qdqpoint 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 divergin59 t8-l(3 m8a6 hfdr hzngvklkg waves, 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 froek tdz:7fu f;q3ddr- )m the source is I. What is the intensity at a distance 2d from the so-) dz;tdk: fe uqr73dfurce?

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You double your distq9jtet+eit)* ,t ejp /ance from a sound source that is radiating equally in all directions. What happens to the intensity of teit)pe 9e jtj+t* ,/qthe 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 distzi2gy 6nzm sdtd:i)iuf6 .ms95g;f9 x-l mx4gance from a sound source that is radiating equally in all directions. What happens to the intensf:n)s gis yldzuz. 5fxgt9 mim46m x 9;6-2gdiity 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 in sw ceo8z.l7p*j. k6jzcreases 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 spea; 9gabh;i5wji6mmcm7ker emitting a pure tone. What characteristic of the sound increawm7 ;h9 bg6; a5mjiimcses?

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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 music x qix5 )cg2+dsoeh+r/al 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 tav 0lgvs( p*(4b-)wjnwoc3 k 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 ih*x: nz)asb/ dqz-vo 0nto water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacey,r;cnh 4 pu5ament 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/l1n- 4w njwf 2d5qidq a guitar string and the sound wave generated by the guitar as n i5dd-nwq4lj/1 2wqf 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 j:y jps 9s4et0qo-nf 8is open at 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 o0m i ;7au,1y ne5 4odnv6psvspf length L. What are the wavelengths of the three lowest tones produced by this pipe vnyodvma6p5 7s; s1p0ueni4,?

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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. Whic, h:v1 hc5dcj2cxi)f jh one of the following frequencies will not resona5hf1 c ):hi2 cj,cdvxjte 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. Which stat6d.l /w xalh,,p /w3xfzjm/ iyeme6w,x/lfad hzlw pjyx //,.3mint 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 clovc 09aa) 8;6ipmbgsfnsed 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 length L. 2 w.y14v* ibuy wdh mqdb*5n/i What are the wavelengths of the three lowest t ymw5/db*indyu i4h21*.bvwq ones 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. Which of thp.c+j 7eon (;u -pucgce followingo;u (c+eucgpp7-c. n j frequencies 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 it;vcwqjk8if d99 hwcv r7ll i*:(2r8m qs fundamental frequency. Which statement is correctch:lqd8 27 flj9i(v;w 8wiqr*crmkv 9?

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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 3btn.z7s5u yte+tj6p oz+5 zlby the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound is 330 m/s. The person +zl+oynputs5t. b6 z57tz3ejis
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 wavesx;4 p7n( jhsey 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 ishb6q* u;snyq/yq(7z m 5mgtx 3 heard. What happens to yu h/st( 73 ;qy6 mzmqq5bn*xgthe 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 exptka bgxzc9zab51z nz+l5 3)5alains

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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 obser;x tdu*kfbyt.o-7q-g5uu2 myi9ky 0 u ver. The frequency heard by the observer ismy yy;.u0iuf7 9kkd2tou uqbx-t*5g-

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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 otfz58+t ;z fswm9o ()qtg 9muabserver. The frequency heard by the observ9sogmw 9f t+azq m)t5 8(zu;tfer 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 decrease by1+ szlrksdna 77j (1tb a factor of:a (k7rz1 s djs+nt17lb

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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 ozi n (su-5qqj*f frequency 45 kHz in air is 352 m/s. What is the air temperaturezjiqq5s(nu- *?

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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 air cf8n5pn-b. uf 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 a0ppqkb.3k*2hiru( 3wozj x(o shriek whose echo reaches it 0.0250 s later. How far away was the obj ik b.3(joqk03p*oz wp(x2urhect 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 heplyhdsex1,dyi/n5t1b4) ,a qar the echo in 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 8jm 5e/3am6bq3dmy f2 gyiymhq9a/.k after seeing a flash of lightning, the distance to the lk3bm95mmh.feyja y6q2madqg // 8 3yiightning 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 td;n0 ,yo:vf. uhuq2j ihe 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 later. How deep m,7)ry ksw)0 u em,ceris the well? (Ignore air resistance, and assume the velocity of sound is sr7k)wec ,)um,0yrem340 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 frequency 500 Hzdg;9n3q qh:kgqg.-ciz9m zz: 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 a wb +v79dr igx0.r7zvzir 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 intensity leuqadmn) n7dhj7os3;*5q 1;e z wj uq2uvel 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 a 70-d- tc*xd8y use6B 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 intensityu3kug*hu*x0/ n,t2k hwf ijmcalk;. , levels of 70 dB and 40 dh u,0h.gm/*xuaw ; lck kifk32jn *t,uB?

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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. tr.qix ,8y*l-t uw-jkWhat is the intensity levew-.q*-ury8jxt k ilt ,l generated 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 that is radi)xyov)./ck baating equally in all directionsox byv/.cka)) 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 distancec(kktiz8x-d;h/- r deuy wfdn;j9m 85 of 6.0 m from a source that is radiating equally in all dkwd;;xknc tih8-9dz-jr dmy 8/e u(5f irections 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 assumedwhic-yp yz(0. to be uniformly distributed in all dy0zicpw.-( hyirections. 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 5.00 m from a barking dog. What wtwb7s.vwdosc; . 9m0 c/)6eg 7i7bcuh: ty jllould be the inte9 lc u c:jww;/)gsoh6. c7emvdtsy t.07lb7binsity level 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. What p g- 2e5rv5mx* dw3vq+s1pv dc/ox*xo is the intensity level (in dB) at a point pg5*+e-r5/1wx *d xvsvm pov2dq3oxc2.0 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 m from a poi0 ca68cev(vw) uhb3exnt source is 95 dB. At what distance will it be 75 0wb )a6vcecev3 xhu(8 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 qrje41 3ik( i; 1twgiaof 1200 Hz. What is the frek1rei3g j4 t1(;qiwiaquency 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 harxlx*gve)ud * g m (mu88uod40hmonic of an open pipe is 900 Hz. What is the length of the pip)(mdxuvl dhgx*84 0*oum 8guee?

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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. What isf,pn45mxz pg;4k(yhe k j/o w5 the frequency of the lowest tone that g5on5 x;ep /m44jpy (wkfzh,k 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 m. If the velocity of jk)mz nfe,c05 sound in air is 340 m/me5 ,fjn kz0c)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 tempex,b ap:5f:rxev bnwj1:( x(w 6vql9wkrature 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 onejdzvo+ i 3 lodcz/pg z g8-uxv0+/pv6- end is 330 Hz. What is the frequency of the third harmonicl vg60pz ov 8 /i+dvzx-z3pg-/jcd+uo?

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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 pipepd i+7+c( pwhe.vjzvl dkr2/ ) closed on one end that will have a fundamentadj r(.dcvw+)zhl+2 /i kpp ev7l frequency 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 wher ri2x4fn9 qbat2u3r1 ge the 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 8u+b x j8pp(t+ fs0rlop:d-glin a 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 wu lg2s9/olo rigu t8e199 xsp:hen the speed of sound in air is 340 m/s. What is the fssugt ll91u9ex: opig9o/r 82undamental 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 c3 lu xm;cp(8y4 ivynhx+ t/bkg75 snx*losed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is thmcbup+5(i snyxv4 8y/*n3ghxk x 7tl; e 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 air where tu:qrhnh(ij+ -0i cy6fhe velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an observ(y rjc0-6+hhifn: uqier 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 same frequency of 500 cyi xq::lll(: Hz. If the distance from a person to one speaker is 5.00 m and the person detects little or no sound, whichi:y :x(qlcl:l of the following 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 beat frequebnp/1h7ow-y, nlh o f1ncy?

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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 musical e 3lwh( qy5,om1y1pgp instrument. If the tu 13qg,e oppyl5( my1hwner 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 bz/fku2x,afz5iz 86wsw+n5n wy 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/s?w 55/iwun6w+8 2xzsf anzz,kf

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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 *st* jwr/w0e rviolins in an orchestra are found to produce a beat frequj 0we/s*twrr *ency 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 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 the speed g .npd2in* 4 wnkynx0/1btrk; of sounxdg4 1*tk0nkwn ;.i/y rp2nnb 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 +w+(qcerga ;z frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observe gzra ;qc(++wer 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. If a listener movez 8:s/wger7j,6tx ke ds with a speed of 30 m/s away from the source,e,e7 8rgdxjwk6t:s z/ 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. Iti.s *( utenopi4swm 3l3wl/o4 9tg,lz is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. 3ue,w 4ioz(n3lt t/lgwmso.s i9 pl4* 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 3xvepv+ /5 2tfc yi0j- bnu/gfa train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and theu-vtjc205iv/y/ +be nf x fpg3 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 dwkma,krh (00 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequen( whd,0 amk0rkcy 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. Tboyd) 6 krb + z*6po5;zahvmm-* ai0mdhe train blows its 400-Hz whistle. Take the speed of sound z 5m io6z h+v0)6db-b kyaa*domr*m;pto 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-Hz whis5 qtiy. vddu(:m 8eu;ntlei8m; q5t :(.uyvedund . Take the speed 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 a52*lr; or r jcgewljjy 2+ogax 45ms-5dz0f3 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed rf2grlo gje5s 50 5 xl2r;3azj*amc-+4odyjw 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 train horn is 500 Hz. Assume th .ony9a5vc vz-e speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train withv-nazo9 cvy 5. 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 zp6say7-tct-l jxi 4 1in air is 340 m/s. What i7p1ix t4-syc -lta6jzs 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 the3m o19vqc bxb3 speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is theqb93x c3 obm1v 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 supersonic aircraft vmyz 6eyx u37l .w)e;bis $60^{\circ}$. 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 c6d-ap;- dtg3 ll+ +yhpl w2hlponical shock wave formedp; hg+ p-36wd-ldhayll+lp2t?

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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 a Mach num5d0inkz ji euu +0.1wcber of 1.05 where the air tewki0 +0ji5z.u unde 1cmperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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