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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 statet.tn6 vl 2f3,q1czmhpment?

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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 cond9qmlxt+nij -0ucted 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 in a ste +djr4z7o 2nrh,mqz-bn *jk2kel 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, wzti4;wsy (8hsi/ pi1dn /qirt.dyi 12 hat happens to the velocity of sound? (Assume that all other ftyqhz(.id;t 4i2i iry// diw81ns1spactors 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 o .mo4 oz:a l/qdsjq9n6 8z9rgdf a 400 Hz sound, the velocity of a 200 Hz sound through ail r69qmqj o zos8:d 94.zagnd/r 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 wavelengthhr-0a7 gy8wppyw fx .. of a 400 Hz sound, the wavelength of a 200 Hz sound in air xw.0a r .-8fypp7hgwy is

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations wita1otpz u)d8;dh 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 2 y(m, uepug,c,ai+n e20 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 directions. If hmlbm0: k.jrwnu myg*v ;8u2) you move to a point twice as far away from the source, the frequeny m*mr :mvjk;l0u2.u8 wb g)hncy 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 is propordgjia 4,6od, r)do n1ktional 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 fr1; mozq4q)id55dvwkh om the source is I. What is the intensizodh5m )q i1wdv45;q kty 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 apj ri(tusig)925ig9 o sound source that is radiating equally in all directions. What happens to o2s ipju95)i ir9 g(tgthe intensity of 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 from a soub:7x 2zgoc2hznd source that is radiating equally in all directions. What happens to the intensity level of the sound? It dropsz7oz2 xhgc b:2 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 beihb8/ gq0u l6zcomes 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 towar1avwlc 7m 2lt p2;wzn)d a speaker emitting a pure tone. What characteristic of the sound wl;)ctw avnl21m27pz 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 notnz y6m8 +eybv2e?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "q6fds xr q;l4b *) ehh:sefnnjga475(pitch" 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 air into wate4q zque nenm)m1 do5kf 33uf/cgx-/ p6r

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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 arem9hy7d ie(1k48;kht8fiuhf 8an r a (n

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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 gbrlsf1ks f j2*nr 1:*auitar string and the sound wave generated by the guitar as a result of this vibration. What do these two waves have in ca j**:1fns21lrrskbfommon?

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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 itmxmi/06chnes)( 6 cat 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 three lowesv-4qoor s-mkwdb/j3k j- o8hj k;jv 5(t tones produced by this pirdsv/jo o4qhk;ob-(k 8 j5j3 -kjvwm-pe?

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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 pv/ 3thvit227i sss*wbipe of length L is 200 Hz. Which one of the following frequencies / 2tvi2 sw3hbts* 7isvwill 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 is7c(x z0yr)-9f2 jdrzxbhjwe. resonating at its fundamental frequency. Which statementhjcybw x( zr2-f0)jz.xre79 d 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 closed at the o qa3/y3,v pq2-7ao tlk e6ywbvther, 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. b zjpc;wqz. +,py +;fqx6cu9 k What are the wavelengths of the three lowest tones produced bpc zq c,k;+ ;9.pj6xy+uzqwfby 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 L1nk(m *-pdm1s7x pas t is 200 Hz. Which of the following frequencies will not resonaten a1-*kmp dsm(7xpt1s 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 fundamental fqzy -b6 du:5egrequency. Which statement is correc-5:6ygb uzqdet?

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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 . +fyj xy: *ibi7f l28ya8jzmu/3wftadriven by 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 isyimff8y * + /l3ab2xuywztjj:.a8i f7
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 s l3vj2 vnedrcy836ch9hould 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 fclhr;kle c( 7g)r )3pr+pfse7requency is heard. What happens to the beat frequency if th(c+pe )r c7p7kgl )e3;fr lrhse 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 exp7zvn -3w;e;cf owjiocajp . -/2w8y zaqs9tg5lains

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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 heard by tva97 lo;slh3ojrf;f9. ktfa : he observ s3 flt 7jofavl9:a9h;o;r kf.er 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 stationao6;y9qo k3,lfmr8jen ry observer. The frequency heard by the obserqf k9l6; 8,ny3oejmrover 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-spe+ 2ue1* lxxjpmed, its half-angle will decrease by a fac e1xx p+l*uj2mtor 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 freq ufhz0t )wm +ep-9gd0xuency 45 kHz in air is 352 m/s. What is the air temperature-+d h09p0mf zewxg u)t?

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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 spee c//9(naoxw ytzn0y3v d 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 bat emits a shriek whose qnpkp/ 87g2 gq/z5umwecho reaches it 0.0250 s later. How far away was the object thatqq/gg7up8pmkwz 25 / n 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, andm,c34 k)yenl g 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 dis1pobeyz s /)lg; hj/x/tance to the lightning sth1 l ;szbg)oye px///jrike 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 2.0r 7r0 smqbus986(jc km s(g+zc s from a cliff on a 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 wetgcql 34 ulwcwa--:j1ll and hear the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume-3w u : clclj-4tgqwa1 the 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 yb y+5o1qjq7r 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 gx1/krfq/+7kbx q 8m 5ps* ipnat $23 \; ^{\circ}C$ 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 level3fm /i3 zf yii ryifd8qum+2rq *f3(s) 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-dB sound?21 bs;rh2a ed3(m/1i f e emok(v)smom

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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 1c qiw1j.nt5s6 q0y gkintensity levels of 70 d jkq6yg0 15n wcqs.1tiB 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 10;u2y,f h(s(yqeec n)elhm 1 (f0 dB. What is the intensity level ( ul h f1(y2ehceye,;)qfsnm(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 radiating equall/ae e gw3si72ay in all directions iss7 ge3aa 2/ewi
$6.0 \times 10^{-10} \; W/m^{2}$. 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 is radiating equhnfs0mh xw/k(o //ciha2ifo: 2 qv00 rally in all do200 i fsqmikx//hf ow (av/:02rnc hhirections 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, whts u-)fepwdy1p(r q /-ich is assumed to be uniformly distributed in all direction)(wt us1dpy q-fre/-ps. 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 ayts 65n8d zs71 lmen:is 65 dB at a distance 5.00 m from a barking dog. What would be the intensity level if tz:ley6 s58 a1n 7sndtmwo 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 dBc77 ( 6wdrxl ,wocxxf xr;q::c. What is the intenrdl( qfxx;,7cxwc 7::wxco6 rsity level (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 level 5.0 m from a point source is 95 dB. At what distymhv8: *luk 8vzpk/ 2 u.v1yjeance will it be 75 d2eyk *z v kp8.v/yu8hum1:vjlB?

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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. 0 9e;fm;jaq/rvvi5gzWhat is the frequency of the f/g ie q;;95vz rjafv0mourth 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 texm fn0zpf-35tvh 8b7hird harmonic of an open pipe is 900 Hz. What is the length of mb 38 pe7znthf50-xf vthe 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. Whatxh,gh ke z j,:l j-r-x1k-1-cwa bty)z is the frequency of the lowest tone that will resonath,e j tjkxwy-bc1r)z a--h1zk x-:gl,e 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 hamjp3*phero h41/ ;gp eydxe.b3ck k37s a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequenc;hr bjpy 3o.hp1mx g/7eeec3d 43pkk*y 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 temperatubu la8u,;hv d u, 9.nt/hlg 4a7qcbz9bre 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 ij)b463*dnm nfy xm9 h3h k7ybqn a pipe closed at one end is 330 Hz. What is the frequency of the third harm hbn37y 69)43yqknf *djbhxm 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 closed9h2my owe-a/0 kbvs p) on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 3key om/sw2)a h -b09pv40 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 temperature i0.y (zy8zdv,m6jul cgs $20 \; ^{\circ}C$. 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 n;o 0, 0bapgemin 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 when the bcw r446s3o3iw eu;zjspeed of sound in air is 340 m/sozcsw3jb; re43 u4 i6w. What is the 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: one is open and the other is c;86f r t ocup1yr:s jz)*syyw.losed on one end. If the fundamental frequpcyr yysoru.zf;s)t* 16w: j8ency 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 frequencxh2zsp(c2 6cvo+kir2 y of 800 Hz in air where the velocity of sound is 340 m/s. How much farther back would source 1 have to riox pc2 2+vsh zc(2k6be 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 lop o89ux,4.hx 8n-a2(e v bbsd*q einside 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 2nxu np8v8x qoo9s-deb . hle (ia,b*4or 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 440 Hz and 444 Hz. What is the b5 . -ig6 t/ydqwqpy)in 4u;d,/gcvijn eat 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 aei *;yrny/sm 7 musical instrument. If the te n*sy/mr7y;i uner 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 q*mwhh48tm;nqj se, (m and 7 m respectively. What beat frequency is heard when the hornqn(mw* ,mj8 qt;esh4hs 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 twz4fj+ c4lcgk /9ueco e .d-rw7o violins in 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 tension of one of the strings would c4cle/4jouc.wr9zf+ke7 dg-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 sourzrzmj as h3k/,2ep39 g 48npw-5eutlo7arf j8ce at twice the speed of sound. The obsetnr 9z5a4e83hr3 p j, z/e72ap-fs uj8w kogmlrver 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 frequency of 1000 Hz) approaches a stau/sy y iv8hd5jli5, .ktionary observer at one-half the speed of sound. The observer he u/v 55k.i,his y8ldjyars 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 speed of 3k 4z dsvyq()x.0 m/s away from the source, what is the frequencyky dxz.4( q)sv 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 is traveling at 35 m/sxbyrp+q (g 7(b3tprs( on a day when the speed of soundpxg +p(7r((ry3bstqb 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 hea8 jj3bad+ wa6 0jrvobqgin(-0 rd by a stationary observer when a train approaches with a spevq8 aiwn3+g b jrjj0a0( -o6bded of 30 m/s. 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 whi nwxga81eh0n ,l.dp p;stle. Take the speed of sound to be 340 m/s. What frequency p0anhngxw1 lde,.;8 pdo 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. ra , uy7d9xa.(3c th;jijx.vu The train blows its 400-Hz whistle. Tac7jvyauxh. j,t.3 ixd9ua r;(ke the speed of sound to 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 tra: nwsbgnu/m h :2wb ae*gqz/27in blows its 400-Hz whistle. Take the speed of sound to be 34hwg q g2m/en:bn72a/ sbz:wu* 0 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 youht0sj(qt6uc dkz647k at 120 km/h. It blows its whistle, and you hear a tone of 400 js66 kthc0kd7(ut q4zHz. 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 av yq 5,a/moiq/nu k0(db*u8dj ir is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a speed 0m ,n8a/ *v/dui(ybudkqj 5oqof 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 hordpnf7 8i kxdb*jf+(fmo k3;1 yn is 500 Hz. Assume the speed 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 o + d;n yk fxkb(oj7m3fd1fp*8if 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-kHz signal is bz/tbx,q(uy g 8sf+6x sent out, and a 42-kHz signal is returned. Assume the speed of sound is +u8fg,b6bxxqyzs( t/ 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 s2cqi9x9b2wyw8)rh l lupersonic 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-ang/f9eeiud/3-/bh/lh s, 4intvu f6yable of the conical shock wave forme 6huft/v9 dby4a//ibuhsi,3 /n ele-fd?

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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 t,1 zv1irj9l:k qo toiphx 1pye21ox* 1o Europe with a Mach number of 1.05 where the air temperature is,1 pil1xh12x*kp1z j1oqy to v rie:o9 $5.0 \; ^{\circ}C$. What is the speed of the plane?

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