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习题练习：Physics Unit12: Sound
本习题练习来源于51fly国际课程 (https://51fly.win)，是在线习题练习的打印版，您也可以访问本平台网站(https://51fly.win/)直接在线完成(注册并登录账号后在首页左侧输入试卷号 70 即可在线作答)，，作答电子化后可随时回放，查看每题答案与详细解析，搜藏保存任意题目；教师使用本平台可以抽题组卷或一键复制他人试卷，布置为在线考试或在线作业，全自动判分成绩一键排序导出，省时省力。本试卷的直接作答链接 https://51fly.win/test70.html
 作者: physics  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 st c hnq,7a q*ixk3r1uh7-ed ep,atement?

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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 fxw,gh5 j th7g.u6rd +s0v:p sconducted 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 souh uov8.,vr *d1f2 ixjlnd 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 b)wji0hy3z 7vthe air increases, what happens to the velocity of sound? (Assume that all other factors remain jhbywv) 7iz03constant.)

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the velocij;b lj 2;j,udg),e mtzty of a 400 Hz sound, the velocity of a 200 Hz sound throu)z;dj2ubjm l ;g te,,jgh 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, ue)u+ )vc1ywj the wavelength of a 200 Hz sound in air)u )vej+w1yuc 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 great+2pg,5i y+kzebge ep89a uc +yer 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 freqqs. lg( uiv:zzi6(:cz cq*0qouency 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 in all gc )68 keuax;5 sl0cutdirections. If you move to a point twice as far away from the source, the frequenc5s;u gckx80eu a6 ct)ly 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 w6basyk/cvpc+hw5 5 4h aves, 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 sou y979gexz*ns xrce is I. What is the int9*nygxex s 7z9ensity 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 distancmf xt gq3ec16:np(n a;e from a sound source that is radiating equally in all directions. What happens to the intensity opten1mq ca(:f; 3g6 nxf 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 f1baiz u)jj2o- rom a sound source that is radiating equally in all directions. What happens to the intensity lea)2u 1bio jjz-vel 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 ;*vjy7tl/n1pl pph( i 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 emitting a pure tone.b-eh(c0 d lz i(q2ut:z What characteristic of thhuzd0b (q i-lc :tez(2e sound increases?

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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 musical jret,* a2 kee mbf3u8)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" ofh u2pwfgx.-e*;4abib-/ iiqo 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 intok k h36av5cqy2 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 wkjoi6dj()pwgez0 t+n c ac8/2aves 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 onp8wmzqu7t:, v+v3 sn w a guitar string and the sound wave generated by the guitar as a resu3np 8v s+mtw 7zu:wq,vlt 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 i nqyada v.cp37 lh**g9s 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 of length L. What are the wk5;yqawcg l0* avelengths of the three lowest tonecyk5w* a0qgl;s 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 i.j c7txl1q v,Hz. Which one of the following.c7j1 li q,tvx 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 is8ba+ux1ni:io/fr hkj bzw02 2 resonating at its fundamental frequency. Which statemenxib28zkrbh02o+ / f nw:aj1iut 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 clp h1ua qc ; 0p5yt,n09-rtyaqmosed 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:k+qw8k hy 7s.0cgksg length L. What are the wavelengths of the three lowest tones produced by tqk0 kg7wksc+. 8ysh :ghis 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 p0gs9 ;dm2*gzc1 fplh dipe of length L is 200 Hz. Which of the following frequencies will not resonate in 10pm2 h g 9sdlzd*fgc;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 resonatr (pukvj1 s( -p(khpwk22xm m4ing at its fundamental frequency. k2sumk(pr (-kx v1pm2ph(4jw Which 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 sam s1c+3t tiea3oe 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 is ot3teia+3 cs1
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 twooy7ou 0ac yd-+*qqm4u)st 8t s 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 together and .s uyrpd25 ld+a particular beat frequency is heard. What happens to the beat frequen. 2lsru5dyp +dcy 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 exps (xypv8ak( t*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 obser0q ta xmm4bisd5+xq::v8bk1y ver. The frequency heard by the obs:1ti 54b:y+d8mxxbs qm 0akqv erver 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 statv(eyty+0lu 2 vionary observer. The frequency heard by the obs0+ev(tvyy lu2 erver 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 it b1x 4:ajk6pm a3*keg2ppcd yoyf75v )s MACH-speed, its half-angle will decrease by a fac3a kx1vbpe)kpf* djy:a75my4opg c26tor 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 i0x f/omvzh11ys 352 m/s. What is the aiohvm1f/ xy 0z1r temperature?

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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 a)t q+qf:tws)ht $0 \; ^{\circ}C$ 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 oyhc 0 pwbk-/qdr1-jgqr; .2z cf sound in air is 340 m/s, a bat emits a shriek whose echo reaches it 0 d;c1qwrb-r-z0 cgk./yqph 2j .0250 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. The temperatur;,2u ho1 xsezmu3mni(e 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 agzt opck-+ m,44xizc8 flash of lightning, the distance to the lightning strike is abcxk4zic ,8 +tm-zp4ogout

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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 tu5,fp5xpl0- z:bkio ahe 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 df95sfpb ,v l;ueep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sound is 340 m,pb fuv95 f;sl/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 mh hh lx--tk wc no9i2sjy5(b(b2 s-3qy9rz (cof 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: 0/dt8p lorlg $23 \; ^{\circ}C$ 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 intenzaksv+55e 7vk vro6 d8sity $10^{-3} \; W/m^{2}$?

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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-dB sound?zj r2jtd q(19j

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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. cg ndyq.9 sr7q(q.t vwcq6+i levels of 70 dB and+rqcvi .y.dcqg.n9t (7 swq6q 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 x456 o s3pnmkth+8pxkthe intensity level generated by k3pxnsm 684o5k+ thpxone 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 radia6pq 0mq(cgmm38kz j+iting equally in all directiqpmmk6i3(8zq jcg0m +ons 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 m from a sourc- n :7fl8bfnesy9jgv 0e that is radiating equally in all :e8f0gv nn-sl 9y7b jfdirections 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 assuum(bfg7r k /:ymed to be uniformly distribu kr u(:m7bg/fyted in all directions. 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 fro 2qxlqecpf z 6g)e28-om a barking dog. What would be the intensity le 26gel- )f2qzec8xqpovel 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 voew:a u ui+jxg8i2zw 8ey:m* n6r1,ym from a sound source the intensity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that e8yy 1u*w6 ewori m,x8v2zj :g:uani+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 leqb4abn; dt8o5j)tc .fvel 5.0 m from a point source is 95 dB. At what distance will it be 75 ot jb)85qnc fat.4bd; 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 hasjwl0tzhx*;l b (fj4 r* a frequency of 1200 Hz. What is the frequency of theh ll 0wbztf4r**j (jx; 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 w/v3e4, dekkyu 8b 2ysis 900 Hz. What is the length of the piue2yb3v k ,/4syed8 kwpe?

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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 pipe7v6q1)a yio8 6fez ges of length L is 400 Hz. What is the frequency of the lowest tone tef 6zeqsaiy8 gov71 6)hat 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. Ii q13zbht -kwfc 25:.fara5yw f the velocity of sound in air is 340 m/s, what is the frequency of the second ha2ac 5tqfikzwaf:b 5 1-yh.3r wrmonic?

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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 temperakka ir(w3h//r dz-th4ture 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 Hpnj*3lo(-lr nnm /ako6u 8 ;yqz. What is the frequency of the third harnnq8j oaou(ny/;kl 6rl3 m p*-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 shortes3v *j,73wtj(mk3zs.d g,xxj/ kwiccwt pipe closed on one end that will have a fundamental freqwxmd( ,3,kg7.tc *xjj / si3vkw3jwz cuency 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 roy/kok03j5xhvbkr0 o u7w79cs om 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 where p d3q1e)+ f xgz15gwc8jcbxk7*sjv s.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 when2)b40rm oqf, 9 nrwrkn the speed of sound in air is 340 m/s. What is the fundamental kob qf0,n4)nw92m rrrfrequency?

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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 oth1k 39* y:1zxb (weudqr zss/doyf-fi8er is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the 3-kz y:( 1qbr1/dfzeo*8dfu9sywix sclosed 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 ttl d/y e69y1lyhe 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 souyledy 9y16 lt/rces 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 sid kgsl05fsa+e557tob,ks: 8fqda mbm .e 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 following is a possible the distance from the person to the other speaker? (The sound speed is qg,l :.bk+a ssde5s0tbm5ao75mf 8fk340 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 44ql;hoj v7- r/y4 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 tune the frequency of a he,b .b,dniw0 musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequhe,bdwi.n ,0bency 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 hns*+ ) zlq4-ke.gqd9m6dc y cdorns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded* q6c-el4)g9zqncdk d d m+s.y 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 arehm eqrq3f .hjt34.dgp ,zvu+5 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 3z3 5jm fpdhqqte4,vg.h. ur+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 ( -f;w0da6r*wy2mzeac o (ocsa stationary 1000-Hz sound source at twice the speed of sound. The observer hears a frequencyyc(-s6d(arfoz;mco 2 waw*0e 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) approaches a stationary observerqcf.7 1l;w -8adutpte az9hs1 at t -fha9a1c.1 szql u7 ;ptde8wone-half the speed of sound. The observer 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 moves with a t* mi/ egg5q-o 8x(cvcspeed of 30 m/s away from the source, what is the frequency heard by the o* 5- m c/8evoq(txcggibserver? (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 r8ag6nii9z/ c(rsdv6 day 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 of frequency does the oag/ r 9ii(sdvr8zcn66bserver 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 stationaryi (zyp( ;mbi7a2agopwrp tr )n .n;r:r:8*dfr observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sbn ro)grm: d8pf ;r((iy2ra:a;pt7n*.p zr i wound 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 towatz ,biir6k t13rd you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 3t k3iiz t6,r1b40 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 g-tlzkw8 w 7i9km/h toward a stationary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do z- igw7lw tk89you 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 dxu83*t k/yyk from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What freqy/* dkt3ux8ykuency 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 yo c*dkyy 2.pgjg;b+qf(u at 120 km/h. It blows its whistle, and you hear a tone of 40 bk2.fpj+g*y( q;dc gy0 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. Assume the speed of sound in air is 34eg 9 tycdq70dose .az;c-vd570 m/s. What is the frequency gds0.cta d59vzd7 ;qe c7-oye 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. Assumph3y 3agsph9f.r,i7i e the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the obser yr,9h7pgshpia 3.3ifver 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 the speed of an object. A 40-k,8g,i 8d eigkeHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. ,eed i8ig,gk8 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 u6.r thkr0b-q 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 half-angle of the conica:ny .yghdq t2j6hc4b(l shock wave formed?q 64ty(d:hncjy b2 gh.

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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 n0yue/ ev p*wnqmtnl3 ppw/0gi)a)z/4 umber of 1.05 whqw 4g0w /muz 0pv3pe*/eai nynpt) l/)ere the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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