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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 followinyk-ij ax)r(q (8r rl-4 a6lx 47siwwqkg 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 conducted fas7mq6 *nhqe3 *h/kf +ei r3rsritest 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 izvp54z tof)9a7e a9 din 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 hapdo 8wdov5r(n3 pens to the velocity of sound? (Assume o r d(nwdv853othat 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 velocix7:a .xzcp 2iyty of a 200 Hz sound through air c i: 7axxz.py2is

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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 so0rw04xcjl n1rund, the wavelength of a 200 Hz sound in air rc0r wnx0 41jlis

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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 g:ywd1i1: au pireater 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 calledkwgr,:hlc7r f-2yp 3a

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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 g2*ja 6m ud8o2tv hu,cin all directions. If you move to a point twice as far away from the source, toum u8c26 *t2hajd g,vhe 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, intensity :8kgdwsw pc0qm nrdn )+3x p77is 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 dk+ b/ u47mj9oix/1orn6 hsgp the source is I. What is the intensity at a distance 2d fd+ hbi6 g4/os/kp ruxom1j97nrom 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 radiatin4uqpl7 61ahgr g equally in all directions. What happens to the intensity of the sound? p614ra luhq 7gIt 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 f8lzeevqk0z2/x44 pl that is radiating equally in all directions. What happens to the intensity levelv xfp/qlz42e4 kl0e8z 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 incjqb,os r58ao, reases 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 speakk9o;dyg (km-7 )hf/xmfts 4iser emitting a pure tone. What characteristic of the sound inct(mfgfy ;h )ms7/ k94kxso-direases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness0k7cuf,kh(oowdtg 42 " 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 "pn2h,2bnu fw0i itch" 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 aod2cu1 dvi;l6d jq* 0uir into water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacement74142xswvbsu y/c;bim 2x0zn. zat xv 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 one lpc: /5cu1qef7p kzz x 82itnf1vy,. a guitar string and the sound wave generated by thinef2vp eczpu7 c:8/lkzx 1tq. 1,yf 5e guitar as 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 is opou24x( h6tpax r1d ;aqen 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 of length L. What are the wavelengths of the thr u4i1 hf; d3pmbbzi4r9) (qbqxee lowest qdp; q3r1 hzfubmi9 b b4)i4x(tones 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. 3ds) iup ;qnj4 21qzzbWhich one of the following frequencies will not resonaidj4q uq21sz) 3nbz;pte 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 fundameq:p4a:tmp);fl m 9rjg ov9b*ental frequency. Which statement ip; 9to:p vm:bm j*4q)9egfalr s 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 ats( qmvu+pj3 3nx-ul0;d 2xedg one 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 pipe of length L. What are the : hv -4y2 fo4szb4pmnfwavelengths of the three lowest tones prodovbn:fs4-4 mh zy4fp2uced 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 closed7 dlshjd( a52n pipe of length L is 200 Hz. Which of the following frequencies will not rela(jds5 n 2hd7sonate 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 fundamentalvjki1 , k-wh fr50ihb+ frequency. Wh-fbrik5jh+w vi1k , h0ich statement 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 spea1u2rifr6 rp 0x/+fk2 np1 uijgker produces a tone with a frequency of 200 Hz on a day when thk1pf0ujg2xn+i1r i r6 r2p/fu e 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 two sound waves shouldmm6etdn 6). fi 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 freqh5a a3r+-g *wcs-d /d.p7a tkex+ oqmuuency is heard. What happens to the beat frequency if the frequeqd*.xra +ogwutdeck/a 3+5ha -m - s7pncy 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 expcldpzi35p1dy( 8aiwb(p1mg; 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 approaches a stationary observer. The frequency he-gn.2aozavy lin 5 9f)ard by the obse2g nal a9yv )z-fi5on.rver 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 hearlgas: fvg(y+uv m m;n-q 4i5d.d by the observer id+f ;lmagm- nu 4iy(v.g5qv :ss

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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 halg7ov*4mcs e j 0vtl-e,f-angle will decrease by a factorgvj* -7 eetsclm0,vo4 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 3q9 yv.)1hb *uvvkl eo+l5ht+r52 m/s. What is the air tempe+ t1+rvbk)h qvvylleh 5* .u9orature?

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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 +1 3hxydf 4,wtqqlfry b6s-fjc (.at,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 ba,t:s n/tiv)cl fr f.e8t emits a shriek whose echo reaches it 0.0250 s later. How far f c/v ,t8t:nelfi. r)saway 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,jy/2wfq 4 j kahi 6yug,7p3o4t and hear 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 after seeing a flash of lightning, the distance to the1u6xd1my* naq-efaydj7 cg8 8 q .dyq8 lightning strike is abouyf* md71qx1 jecy8g daan6u.8qqy8-dt

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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 ,l q.5hr; hl -+evdj7wt /jgjwa 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 into a deep wek uw;x79 8 e1vcub ma,+a7jcjvll and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume wj cjx8b,9ev ku71cma;v+7authe velocity 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 /hdzb2i .mlys0i :q.csound 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 ain5 2ena.ijzq s2- zt)ev ll,7pr 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 lev(izxjq n7s2 s1el 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 kf51iuyo0 1xiqpfk4 3 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 levels +4(j5iy uwmmgl5(vncof 70 dB 4uj iv(ncm5ml5+yw( g 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 the inz6:o* rm 4v yn+qzjsd(tensity level generated by one engin:j4( dnry zz*mso6vq+ e?

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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 soughj8zah;m0 o +rce that is radiating equally in all directions o0a8 h+g zm;hjis
$6.0 \times 10^{-10} \; W/m^{2}$. 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 a source that d0y*hzs au 9/4y qr1pyis radiating equally in all directions1ya0pzsh9/yq dyu4 * r 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 assu s7 mb-vp*q1bimed to be uniformly distributed in all directions. What is thbi -m*7b1 vpqse 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 d.z2q8p0lb*8/bg+ y rfx sn 45ylxukrm og. What would be the intensity level if two identical dogs very cls4g+88x/ym2 zx.bf nr0u5b p klq*yrlose 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 sound4;lgl fj+ rdjvf89- vl source the intensity level is 60 dB. What is the intensity l4gdl fl;8r+-9vjfl vjevel (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 levetfo7yp18+9bw z1vfpa l 5.0 m from a point source is 95 dB. At what distance p1pz19vtbf87awo fy+will it be 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. Wss o9x6asmtn2x byf0d g :sqr(8 5t1k;hat is the frequency of th6gsx t r2fs s59bxt(y; oa8q1nmsdk:0e 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 900 Hz rseqk3s)j n:k1n6mmf28q5ea . What is the length of the pipejmme15 )2a3qsk8qsn 6 :fr ken?

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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- co5w, wlu)nrx,t qx1 is 400 Hz. What is the frequency of the lowest tone that will resonate inuq,,wtn1wx oc r-5x)l 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 velm : irkia/t4u:v .ceo3ocity of sound in air im u .:to rae3:4vic/kis 340 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 r8 t b60 eumo0ridt bx5.:tp6sbo o,o4room 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 one end is 330 Hz. Whaq7v i *.arrfvn *w0pzw,5 no(ut is the frequency of ther.zpvn,uvwr(n75 qo0* w afi* 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 tmh4 g w31lo7udvuqwp 934 1hkon one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is13ohm 31kuw94p4 u qw7vltdgh 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 tempe)r*1rab ( fbizrature 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 room34 cndx ght.5t ff9r:a 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 plaae. y13hl7eo*0ho yg dyed when the speed of sound in air is 340 m/s. What is the fund0o1l*dy oeh eyag73 h.amental 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 (:k2qb n6l,cf)g+z2 m wtzboh closed on one end. If the fz ktbh, (l:ob)+wgn62z m2cfqundamental 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 air where the vely5t0scw+k;ry 0;azh8csqk m( ocity of sound is 340 m/s. How much farther back would source 1 have to +kq ;0y0 htzwkmc(ss r5y8a c;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 si ms6h2*ymctt9bf* ;xcde 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 follow*hmfm9 xt ct; yb26cs*ing 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 l4a.+2xvof 8hkww5 p4ttx4g f444 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 a 550-Hz tuning fork to x y/q o.1ar +zuoiq7 wc1zj+;atune the frequency of a musical instrument. If the tuner hears a+ /jozqaz w7 a+11;yu.r oiqxc 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 andv5) gx zl,*uhqut2 ob1 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocit*h)bl 5v ,oux1g2uqzty 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 in an orcqi0zbvc ixp1i9a1l), opyc x gt)20k*hestra 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 sa 1gxcp0pk,0iv i1))x* o9ycl 2iqtbzame 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 yw 9li/k6b(x9bgz-f1ra1l) 7i az njlof sound. The observer heal a)1/ z b7yil1(zxnir 6glj-a b99fkwrs 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))yy gq1w45myd approaches a stationary observer at one-half the speed of sound. The observer hears a 5w)gqmdy y14 yfrequency 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 frequencc j7gd(lt3t2b +5buu zy of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, what ijz(3ubltbc7d52 g ut +s 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 isz8keyu4re(ggk3rd( gr ()8qq traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The cgur e d8gzq(ryk8grqk)e( (3 4ar 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 a train sf-wku hb0q4y 1mw+:sapproaches with a speed of 30 m/s. The frequ:k hf+ 0qywus1- wbm4sency 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 whi 8(ek+2mv. ;lbj6pt4ftbr v opstle. Take the speed of s2rofvem tbj(4p;kvl b . 68pt+ound 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 120 km/h toward a stationary train.7d+ 9a ) xysjga:akhb tuh om82th8.8e The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What freqh2kaeaxhsh+8ua:bm 9tytd 8)j. o 78guency 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 youmy)zhlflj ,ou- kej49p pau7 0ce 1)1r at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Whatf jluuc9)-1j7,1mh)0pzoa 4ee kp rly 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 awaygkxc- 2lfo j14d,h yg5h2zx8xbo o- *o from you at 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 42ox-dz o bxx gg1k-,5j2hhoylofc 8*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 the speed of sound ut(d mjept x,.su8k/ 3in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away fr.kp,/t 3xu utm8de(s jom 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 sp :mjq-,bo +vrieed of sound in air is 340 m/s. What is the fri:m+o j -q,brvequency 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 determiz;6 n la3mkt9lne the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed3alnlk; 9zm t6 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 prod0gq3gs.rki k q2vfs 6s( y/u8zuced 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 is the hm9rmts2c2cvc )0m;p+yh i-idji y ( )malf-angle of the conical shock wave for s;-m2jmc9h 2)vm)pcm+ td ryci(0iiymed?

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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 Eu,:k oqbos t. fttif823rope with a Mach number of 1.05 where the air temperature.bfqsokto :8i ,3t2tf is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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