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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 fa9r j 1 8)-igvs) (9cudex yrd7vbq*gfilse 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 fastest .+cb*u -6h+wwysu( q+amq cj vthrough

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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 stee6vha, gdvq2x: iqfogn5 ppu +2n6lzc)*ak-3ql 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 sound?pi ja:p2 p5xu7 (Assume that all other 7:52 pijpapxu 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 velocity of a 200 Hz sound th57ter *px7* m ihb-kc f4buk0urough air tukh*7p5m 0uf cb-4bkir7e*x 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 aj) vl*8fcv(jz 400 Hz sound, the wavelength of a 200 Hz sound in air ic(8jjlzvv f )*s

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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 greaterkzsk(aw:8)d j j,(8 ;cpsqw od 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 f7qwi03aix;jrrm4: eupk rdy.z2p4d1 requency 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 wavew1mtj k r)dp39s uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the sountj kdrw )1m9p3d 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, inte,f* el)amnd :n fhq2o0g,r+ylnsity 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 d0kqz,0c 3o u nit;d4pu from the source is I. What is the intensity at a0uq t,c4 pdou3n0zik; 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 all dixo j5ju43g 7jai32 bturections. What happens to the intensity of the sound? 45b3jujo3 i 2x 7tgjuaIt 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 frrcf+ 8;g trm;p.ns-p1cl*g v ad-1zljom a sound source that is radiating equally in all directions. What happens to the intensity levn;r t.pgm +pvf18*1gdc-z r - jallsc;el 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 becov :x4muz k-/c6oakb0q58 yqyfmes 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 characteris r;6afuij-j. ai0ib: ls ;2inmtic of the sound ir.iii l6 :fmsij 2aj0 ;a;unb-ncreases?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudness"z bxj/( hnd,yh co3q3- 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 musical not-.iem7le-4h wqn b g2 kd7*czqe?

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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 dvt20dfhyl+gq m18* c air 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 displacement waves g8s79lx 1*ayca8vb a hare

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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 sr ;lyk5 ;brq(hh ml42n- )v0g+dsmfxgtring and the sound wave generated by the guitar as 5+sbn) ; gr gk04dhyfq;rhmxlmvl -(2 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 open at bjdp0sqk. q(b ,j* 0d q5c,4zshth3knzoth 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 te2p +a.qw6clq- r shd)he three lowest tones producq)p+w2d6 hl.-sraq ceed 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 resonat2,8b a 5pryyvrhp/e.vhk,s* pe in an open pipe of length L is 200 Hz. Which one of the following frequenc,y. 5 bhrpkp/yvr2vs8*,ae hpies 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. W3s6d3c l eba0 u+;is *fu7mtkchich statement is correct?6s3i; saldubc 7u30k+t ecf*m

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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 whid:f mx d(ap+u(ch is open at 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 wavelengths of the three lomqey63;,y x lkwest tones produced by this yxke ;63,lmyq 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 resonatec w) op c*x65p,e5q*sf7uierm in a closed pipe of length L is 200 Hz. Which of the following frequencies will nxeuq*foprp6)c7i s5mw c ,e*5ot 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 itsd)+n. 40jndlwevw (*9c ih ztm fundamental frequency. Which statement0*td4)l n+ chjmdwvn .( eiz9w 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 drivevich;48( im qwa9:dww,b p 0qdn by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the speed of sound 8wwwq0b9,h:pdic;a d(i qm4vis 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 should hav bp+f+z w 4csssba5s (8o2z 3-0i7apchdqxik5e

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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 beatu p:vg1x6-)hkij 9 are frequency is heard. What happens to the beat frequency if the frequency )r1u x9 6:ejip-akvhgof 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 explaioyjyz), 4k5oj ns

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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*idqlkr 4: v 2i0a1nsqard by the obserlkv1as nrqd: q4*0i2iver 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 frfjk03q o nvw+ ua9+2hfom a stationary observer. The frequency heard by the observer no 2f hvajf+w+k03 q9uis

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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-speed5 lyu55bkrx-g, its half-angle will decrease by a factor of-xl k5ug5r 5yb:

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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 84+cdvgz q y(fsound of frequency 45 kHz in air is 352 m/s. What is the air temvy4 (qcfzd 8+gperature?

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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 dpmj4:hn 75xnair 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 sdw . m:zjn(ew q*h5+fh.p4wsair is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s lateqhj fsz*w e5dwpn w:hm4.s .+(r. 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 svo+xb5bd 5 l jjc*82fb. 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 y+gszkn: c*gw.n z oj8e0c+k. after seeing a flash of lightning, the distance to the lightninyzwz+kg *js.cck on ge. :8+n0g 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 is tx2mkal;hx(8 b hg9t8$15 \; ^{\circ}C$. 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 de(ot ss4u+9ribep is the well? (Ignore air resistance, and assume the velocity of so9u4i(ssot+ r bund 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 w 8y xu0w)hn5jaq22gpaave 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 q:3il3 lsg zhn)i6vy)nf2xwg 7:c8 tg 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 level ofr2e kt ;im(v9k 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 7079y d829lq6b zshovt yevzb58 -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 soune3s * 4-qembbgn1px6sds with intensity levels of 70 dB and 4epm 36bnb- sxg* 1sqe40 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 id o9k8pm4o 3vqn a garage is 100 dB. What is the intensity level generaod4qm 3k98pvo ted 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. vezcf xx 50ujn30kg8 radiating equally in all directik.nf0g83jxu x 5 zv0ceons 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 6.0 pq4faro(b+z/ g o1y7,a;tycf2o ebh(m from a source that is radiating equally in al qcoaoa2p7/e ; f4bo(z+fbr(yg1h ,y tl directions 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 abf ur- 3 vmq4.jacun,4iout 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity level at a distance 5.00 m from th 4i,n qca-43uvumrf.je 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 ajfkg ./-pzu l8 distance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very clo-. jzgfku8l/pse 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 -sk td)rk 48 kmnx*us;- utgai;uyy 30is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in all dir--d3yy8kit km4rs k *ua xs )utu;;0gnections.

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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 point source is 95 dB. At what distancclq3+/1fhmd pe will it be 75 dBh+3cdp/lfq1 m ?

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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 120v th.nu y2(b:y-gj tdsd9q,w-gqqd 900 Hz. What is the frequency of the fourth ha,u 0wy-h 9 d 9j2qv:t.(d-gqsq tngbydrmonic?

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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 af8j0;5e+ t2gaa-oxg5kthjci n open pipe is 900 Hz. What is the length of the +cagof htax i08g j-2 ;jket55pipe?

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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 is hp;2kir- dchz uv 4t04yx 8wy9the frequency of the lowest ty4ci9 4 h8zuxpy-t20 v ;rkhdwone 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 m. If the velocity of - .ybsce6ja5j bsf,rcwj ) jpt* 3*s:msound in air is 340 m/s, what is e5sspjby* ,jm .sb3-j farjt6)c :c*wthe 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 temp9;k l7t;epjnfj 6y7 ycerature 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 H8 mg;3phj,ml:pqmvlq z: jb4; z. What is the frequenc3:,jgm4 :m 8pllbh;z;v qjpqmy of the 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 tnfxy o. rikjw (/osz827 hy:.vh63wq shortest pipe closed on one end that will have a fundamental frequency of 60 Hz on a day when the velocityyyk.h:jx (wv2 7/zq3w8o i f6.srn hot 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 room0v /awva h -85jahacdo a46su8 where 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 in a room whg9jdtq9* *f1ho yts f-ere 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 lengt.j8xi9fx1u y8j ayxeq3*u xt-+qu gc .h 0.75 m is played when the speed of sound in air is 340 m/s. What is the fq*q8xugeyi-u yj xau.tf 9xj x+31c.8 undamental 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 othixgqe b,s l:,r 82hs7gj5,e nwer is closed on one end. If the fundamental freq ,g,n2sx:7hi8l, egrsw bjq5euency 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 frequenp, 4fpklcvhr1y*p.lfdk8a01cy of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to bp,yvdklk4 .lf1 frpa 0hpc*81e 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 sk8 b,vfngi g 17rh 9h;qbxz(:came frequency of 500 Hz. If the distance from a person to o z8hiqg, x(gh cfbb97 kv1:;rnne 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 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 44zmr()sl.vqi4u qf 4l5o82j wm)uohb :0 Hz and 444 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 tun8c(n*o- k vgfye the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what foy- nkv8 c*(gis 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 hornsq/mb3gsl0 mq(e ng ,r; are 6 m and 7 m respectively. What beat frequency is heard wrg;mqs, lb3/(eg mn0 qhen the horns are sounded on a day when 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 in an orchestra are foundjxid gi 9xo:ief-+v;) to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. Whaiji) -ve 9+xgd:f;ixo t 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 statiomyvf) msrzizn.27(;d ie jp1) 6k47-qc dtapjnary 1000-Hz sound source at twice the speed of sound. The observer hears a freque)(dfvpmpce6izdtjrjk7 2 . iq z n4yma-1)7s;ncy 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 100 nsreqg ren,*+f b.dax- 19qh80 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a frqx-+9d * qasef1.gr8nnbe, hrequency 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 moves with a speed*o8u5 /ye9x: jj qylu3g /oger of 30 m/s away from the source, what is the frequency heard by tyq j:3 u5// e9reog8oux*gjy lhe 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 day when the s7v )gj5wxv0 edpeed of sound through air is 340 m/s. The cag7j5ewxv 0dv) r 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 whe- glglsov 6-7tn a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound is 340 m/s.ggts67o -ll-v

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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 trsi/u :dc ags m67lr(y3y3)mjfain blows its 400-Hz whistle. Take the speed of sound to be 340 mj s yuy il:cda7f)3m/6s3(gmr/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. The train blows its 400-o69)q re c7yzjcimvp6cx03w(Hz whistle. Take the speed of sound to be 340 z 3p c6orei69vq )m(xc7w0 cyjm/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 w+g:8syd8st,x s5ldo c-hbv.sxs qx: (histle. Take the speed of sound to8qboc g: -.d+ shxx( t lvd,5s:s8ssyx 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 its whistle, and youpy+ie -m.( k n4zcj5kq hear a tonk pk5ny c+q. (i-j4meze of 400 Hz. Take 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 train horn is 500 Hz. Assum/;px1ll0w4lv t qt:-hp bqr7de the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is -p4r/;0q7lpt ltqhwx1 d: vlbmoving 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 scztm4a/lk+6id j5(k ypeed 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 of 30.0 m/s5(4 kl 6ijyck/m +dzat?

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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 sent oibpl86mdh k+2m d *nv w7y(er/ut, aie7rvdmm /y b8wkd(n6lp2 *+hnd a 42-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 sfla8w fy9e( -nupersonic 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 shocqlyd-/ipda9* ;dnic 6k dc / *da 6li-p;dqi9nywave 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 jhuwx+d 7-6z qa Mach number of 1. d-j6q+7zxuwh 05 where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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