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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 i -.cmcqw v1mx*/o8gfstatement?

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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 tiqypz w 89in-7hrough

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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 0g 9z33 r fvfa9ttbmk8sound 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 increassli/ fl8e 1pd:ljg3ta4:lji(es, what happens to the velocity of sound? (Assume that all other factors remainadl4tj(j/i1ge:ll3l p 8 sfi: 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 see 7turdn/b 8(ound, the velocity of a 200 Hz sound throu eut8r b(d/ne7gh 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, tl4vlnx.q*x*5f6 w ,r tqyyu j9he wavelength of a 200 Hz sound in air i5lxyt *.,*9 yrlujfxn64qvw qs

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with freqp;gv)qt1 zv o f*f*nq- n,qqo,sr+mv: uencies 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 tg1z+ 7tz3rjew e 1nq520 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 unifolo mf8e*qe uqy ;bv)g/ 2sc-3j+6vmrg rmly in all directions. If you move to a point twice as far away from the sou)grmq; co +yqs l2 /8g6*jefevbmu3v-rce, 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 diverging waves, intensity is proportiop cl/.s.hb(2prq qzm 9nal 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 source is Ib(-ya4apwrj 8. What is the intensity at a distance 2d fromya4r b8ja( pw- 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 edk);.eozv u-j qually in all directions. What -;vk)d euzj. ohappens to the 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 sound source th bo/m5k7xf w1jat is radiating equally in all direction w o7f/5jm1bxks. What happens to the intensity 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 increases as a sound be chn2f b/9a-2 o/i.n1espwov ncomes 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 characteri:kmt:z 8 rcsap2y3ola)f8h3 js(f yw 8stic of the soufyr2z3wmo 3s t88 jpc:8alfs hay(:)knd 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" o ri7w19 5pnrp e,8uqynf 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 k,pm+(- h/y.pj:.z-s h w9qvyevlfjq cqce62musical 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 :k:op lz6c: f9 :;exayq6 wluw7vm0ii water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemet,/.c0(w:p . : wrmynyqenhcen.8 s fknt 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 a guitar string and the sound wave ghjerz )m02ryh7l j9 +penerated by the guitar as a result of this vibration. What do these two waves y)rm2p9h7+l 0 r hzejjhave 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 ope25d2 mn5m uab ka2d8cvn 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 ofyrd*mkd3h*4f gjn1m3t (m j4vjne0z+ the three lowest tones produ h(43mj3jt1v 4ye+ mgzd 0n*jnkdm*r fced 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 pi+ygl +p+mg7h hpe of length L is 200 Hz. Which one of the following frequencies will noml+hgg py7 +h+t 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 resonate av/clca +.k9tdu,6-ljht h5ing at its fundamental frequency. Which statement is correcte+ lc,tt au.h jv95 c/hld6ka-?

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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 othqfz lzc 61 z2 o15xs w;l.d5tyoj/g/pyer, 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 lengthxmbu1 *zl0l v.dl4h07rmv3. .qxt ux k L. What are the wavelengths of the three lowest tones producemvl0h.ztlq3xmu0.v kb xx71l* dr4u . d 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 200gg7afu3ef85f c hx).r(*ifr u Hz. Which of the following frequencies will u8f7 5u fgaf *xc).fer(gi3hr 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 its funda8 +pum/4w3n.q-z,bxz qbkodqtiie+4mental frequency. Which stim3 ,x qnz/zq bb-.d+4iw84pqoteku+atement 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 them7x.*wnu *oeekn-j 4aczqv:rzp/ /*i same source. Each speaker produces a tone with a frecm4ov*ew 7a rxjp/ n*.ni u:e*z-k zq/quency of 200 Hz on a day when the 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 wavedgq4 8o buk;l:s 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 sou )w9zl/et gd.znded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of)gle/zzw. 9t d 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 expla7d4 c kecao66kk)q-wi ins

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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 *u7clr *p 3o8a2retp zt8lo6lfrequency heard by the observer ietl2utr o8 zr3 pc 8l*a*o76pls

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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 heard by t..lcsg . nj5 b ;dybxxo3:p8kjhe observer ij go .3. s:y b5cn8p.xkxb;ljds

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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 h jn ks2dr:-,j 2vi-jq o)y3wiralf-angle will decrease by a factjsnqjijdy rk -,ov32w:)r i-2or 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 ultraso -z6w1 o)yg69 , ru aoz f*mqpfil.3q/zhnct(qnic sound of frequency 45 kHz in air is 352 m/s. What is the air temp)ca/fo6f91lqq*rtn qh z6 gz m,o ypzw(-u.3ierature?

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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 speedik r5kbm(3o+l 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 ngpd 0isg-3/wecho reaches it 0.0250 s later. is d3g0gpn/w -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 t0x v*ah; io n 5-p5um4kds.fxzhe 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 ofh z;6( nsa5gc0k,eqh b lightning, the distance to the lightning stre(zghb k0sc5, qna6; hike 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 fro v(,zsssn+ za8m 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 :d .r 3lxletjd,qj21ra deep well and hear the splash 2.5 s later. How deep is the well? (Ignore air resi1 l:32l x,drjt.qjd erstance, and assume 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 0/j+e+p72flhg fhp cp lx,2dnof 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-4yv(kd h2orj 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 leve hd+wykdarm 2b 23,r-ul 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-dBwx:5 y3du b ;u,3/eim+3refb3ynmj ys 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:av3 m;gg/0c dsf+ofi intensities of two sounds with intensity levels of 70 dB and 40 dfmdfvo3sga0+i/:g c; B?

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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 int*f . r4m+uvcuv(, :q)wzpn pqyensity level generated by one engine(f.w:czmqvr,)n v+4y pu u qp*?

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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 tuv35ay yqkbm8crxkt24 f p 2t;v1 8j7is radiating equally in all directionuv kp rykct5ya q83v2 8b2ttfj1 4m7;xs 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 aal3x7: s2e olsource that is radiating equally in a a3 l:7aeolx2sll 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 about 1 mW of power, which wh la5r9kf.(e is assumed to be uniformly distributed in all directions. What is the intensity level at a distance .9lk rf(he5aw 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 barkin+ 2adyr aomm91g dog. What would be the intensity level if two identical dogs very close to each othem1oayad r9+2 mr 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 601zxtio4g8+hf+wfg / o dB. What is the intensity level (in dB) atofg++o xiz / fg4t18wh 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 dista ip2svj )e,ogkxo2. j*nce will it be 75v ps)o2xij ,.e*gj2 ko 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 complexs; 1wi7hbo/pv8 0i*tcv(npuz tone has a frequency of 1200 Hz. What is the frequency of the fourth vzo v*7sph0/ ;ni8puiw1bct(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. kz6( g ejn;ktk ,,n6yc What is the length of th6 ; zcn6kk(tg,n,ey jke 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. What zdr8 h9z2+6zn6u se-sf nm-t ris the frequency of the lowest tone th-r nfzuz d6m+zse9s-r2n 86 htat 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 llco* qf 8+jz,nsqxe.2 ength of 0.80 m. If the velocity of sound in air is 340 m/s, what is the freqjzq8 +x2s*e qnfc.,o luency 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 temperagfg, b 5(- 4qhwqb3kupture 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. Whay0w ;kfqxovx5m1 1a*it is the frma 1k1wy0vix*;5foxq equency 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 shortest pipe closed on one end that will x 4:vbahka icu k9l21,::cetf have a fundamental frequency of 60 Hz on a day when thf1l vau4c2 cbk9 xh:keit::a,e 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 is26r2kbbdwta*f;:e zb qdwa 11 in a room 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 the temperatb )t*rk:khg)qujc4c 6 ure 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 lengthwtkwxx4 p- c7:q/ao(o 0.75 m is played when the speed of sound in air is 340 m/s. What is the fundamental freq:- wt 4k c(7wxpax/qoouency?

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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 isdv;89*ot;xj6dqmhv( a6 9wz hlj vg7b open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundame a v9;h;v l*mxo9jqzh w6 7dvd(6bjt8gntal 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 velocit-fn+dtm;). tkr f4s86gulg xg y of sound is 340 m/s. How much farther bt) g+d;rtlmf.86xf 4gs -kg unack would source 1 have to 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 ssjzz:zj .b)8vz* si v4ide 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 j4b j z.ivzs:zs zv*)8a 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 frequen i.2lp h;xsy ch;lfb59cies of 440 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 tune the frequency of a m6,iri6 u:xa z n8tdhm7usical instrument. If the tuner hears a beat fretuimd6:n i8h,z xr67 aquency 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 pj2hx+ux) wn1m roduced by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when th1u2x)mx j+hwne 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 tw8eweo,0ci*j q o violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentag0eewo*jciq , 8e 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 stati+n; xme5k 3dy 2xoj(bwonary 1000-Hz sound source at twice the speed of sound. The observer 3joxen;k m+yb2 dxw5(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 frequenc 9)k,p*n 4b3i7ilgkkd1q l0 owxrce l;y of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The obs9lr, *k43q0;7nle ow k gcplb xdi1i)kerver 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 10inekml3s ,g2eb+ 4b c700 Hz. If a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The soundbn l+3escb47giem2k, 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 th)g 7m+y14l v gdhw+tcwe speed of sound through air is 340 m/s. 7t+ c1hw)4gydmvg l +wThe 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 aoqkq97nfxcp f. w7 +j6 train approaches with a speed of 30 m/s. The frequency of theqfo9 nck f76x+. 7jqwp 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 mtqvvsd v/v3 2n0 (hw):a5rb zio2k 0vtrain blows its 400-Hz whistle. Take tht2ndv b0)vzw vs02:3hk5v(ra m ivqo/e speed of sound 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 sta) y4h)qem/tfz ;bnj,h tionary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What y t/ )znhjhbf;) qem4,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 fyflm6 o puu r*a2o;0,120 km/h. The train blows its 400-Hz whistle. Take the speed ,ua omr2o 0l; ffyu6p*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 ab55+vyqiifdr u- qqz a,n74*e t 120 km/h. It blows its whistle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual zi -47 ,e5vr*dayq5 uqibf +qnfrequency 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 344y 5ron- 2lnhm0 m/s. What is the frequency heard by an observer if the observer is moving away from the train omrn2- n4yhl5with 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 ty55xhe5 4bv in-zc af+he speed of sound in air is 340 m/s. What is the frequency heard by an observer if the obserfia 4yev5+cxh5nb-5 z ver 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-kHz5n:3os+ gw7c0zwzh3x 3tv z(tcb uc:r signal is sent out, auv7zc3 c h5 (wo g bw3ztnz3t0rxs+c::nd 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 -q (v2e5 qby 7zdz:a6e(uz xwlshock wave produced 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 zc l-qw/l nllf()ern7ee9 w1 *the half-angle of the conical shock wave formed?w)r c(e lw 9e1 7f/*-lllzennq

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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 nty v5b *i)9 rdq nskj6dyl1;-cumber of 1.05 dybyr9cldt16nv kji5)s; * q-where the air temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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