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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 falshyyk a q7c 8tjdv:1+v3ei+yin7 i zol6m89xi1e 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 throughft2b e8n /t5uefg;svf wtw*:4

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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 soundnc ppr4 7;cuv: 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 increases, what happens 5r ipn)xloq2)*3xpnf to the velocity of sound? (Assume that all other fa xnfnilx*p) pqor2) 53ctors 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 40-cd*3; c hj5hy4y kmbw0 Hz sound, the velocity of a 200 Hz sound through ai* bmcy5 -chhk w4;y3djr 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, the wavelength of a 200 Hz sound iwd;*hv*sfw jcj*db0 9n0d;wh9bs *w fj**jv dc air 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 greater than 20,000 Hz ar:8rj gcqq+co ,ytz 84ze 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 cav8 tfqa: f61allled

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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 unifoz0uh x9 ;o:ggauo ah3ru4/k 2qrmly in all directions. If you move to a point twice as far away 3hu;oa9g/a u0 4hqkz2g:uxor from the source, 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 proportionry 8 -e)h41h: selgr oali;5msal 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 pointd v, :q7jm 7h(j6;tisjtzh mcmklz:+/ source at a distance d from the source is I. What is the intensity at a distance 2d from the sourceiqmjd:+jh/ ,(z 7c7vmzj s:kt hml;6t?

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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 :y tu9. pxov6t)y :qa d-kt7femxs+9rsource that is radiating equally in all directions. What happxesy+t.pk:)f-t a69v:9t7rdq o xmuy ens 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 that cw.wlkh/rea h 2 dj(hw1u(km12n. c)wis radiating equally in all directions. What happens to the intensity leve(khmhcw(we jducrl a1)2 w2n k. w/h1.l 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 increased55 dh d,*kl)0 vgwjpws 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 towardxhz2) b4x svrd4 5m5bh a speaker emitting a pure tone. What characteristic of the sound increase 4v sdrbxz)5 4xh5mbh2s?

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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 y*z49n lxrc0.wn uwq 4r9vwn4a 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 notj9w bqfr btf 68fadr630r75)yugl3d ge?

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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 iyw9 97qzro fyi+ qx;kte4sc28 5f3cnanto 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;6z xhkh;hkbn2oh/w5 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 slg+a it2vqb+pv oa89(og)x0 mdoth 7;ound wave generated by the guitar as7 2;tqvda +ap)+9th goo(bi8x lvmog0 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 both endrxe6q7rw9k6 9mfc5w7 pt5 uats, 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 t8c lg5(46wrd6po6ve yrburj8*i njk 6he wavelengths of the three lowest toop(nr666 dy4r kjjeb 6ugv5w *i8r cl8nes 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 l8cn x 2sx(q h gt(bc,)m1x+bovength L is 200 Hz. Which one of thegox (bx +812tcv, mq(scbhn)x following 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 is r z, jz58vy3qcp6m jdggvd:,i*esonating at its fundamental frequency. Which statement,6vp5q : gzi8jmj,cvzgdy3d* 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 opec: u. ml9/oup6a zcvl81jtoc:n 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 vuqylztao-og(9g4. 9the three lowest tones produced b.gt ogozq -4y lau9v(9y 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 clos1ug x1(out hc.ed pipe of length L is 200 Hz. Which of the following frequencies will not resonate in that pipe? cuu(hto1.g 1x

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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 frequency.u g6u(rx*y5bn Which statement is cu gry6nu *b(x5orrect?

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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. E0gdl+f6.ml; fbc 2 zxbach speaker produces a tone with a 026d;fbxc zf.+lmlg bfrequency 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) 5 feze.ejlfb3z w4;kmdmq 0- two 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 ssxap,0g p2 74.lxa xnrounded together and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of th p .r4,paxg0lsnx7 x2ae 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 expqd8 qmuc)2z(gv5 pb8elains

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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 frequencpt6i50gz snnrq)7 s6fy heard by the observer isnq70s 6) ipnzf6tr5 gs

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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 art.qx)t4cl 2 the ob rt 42l)tqc.axserver 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-speed, its half-angle will decrea w:rw/01yq axhse by a factor ofra y1 0/whxwq::

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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 (0aav hpnv-8jjy sb ni4nb070 of frequency 45 kHz in air is 352 m/s. What is v07n iba 8 jbs0 -4phanj(n0vythe air 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 (gs wsf77urr 3the speed 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 spee 9r 7m6.k/y l9:xgnktqh* nwfqd of sound in air is 340 m/s, a bat emits a shriek whose ecw *6 gnx.l/k7fmq9nrkh: yt9qho reaches it 0.0250 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 45bh.* sjnunm bf2ezaak62 (3 r.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 afterweqmpy. p,no)z i5(+a seeing a flash of lightning, the distance to the lightning z)o yw, epi+ p5a(m.nqstrike 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 temperatur *6vejnwos+kl 5kw6 v,e 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 well ac-:q9m6xyf;tes u ityyqcww 8i(( :5end hear the splash 2.5 s later. How deep is the well? (Ignore air resise :wct qx6 uqywf8-tiyc (m 5(:i;e9ystance, 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 of a sound wave of frequency 500 Hz ic8g hk h-xuk w.bs+:by: kqn7)s

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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 ue(xab;cry6 5 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/psgf9a)9/g17qgyp co/u(o wao ph+j level 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:)q4lw(jn g)fww yn/ue w 1f3e of a 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:tb4tbz m0wi8 voh+ 7y intensity levels of 70 dtb ov i b4mzw:ht7y80+B 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 )ttr 73p0t yatewm;s4 100 dB. What is the intensity level generated by one eng0resytt3t;a tw7m4)pine?

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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 a2r6aah+r+ d x kx8wdm2 source that is radiating equally in all dix+drk226aa8x +drh mw rections 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 source that is radiating equally in 05csc:ro p/t,lnz: sn,y b 72vyhrwx1 alr2trpy0o hsy5nz 1 c7,xsvn :bl/,:wcl 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 1e m; 2u-qq1dvc mW of power, which is assumed to be uniformly distributed in all directions. Whatd q1c;umv q-2e 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 fr-dm+0jtsq lrb qp)62 um3l1pbom a barking dog. What would be the intensity levebru2) jbl qpmdls 0t +q31-p6ml 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 m rfw 2yx* 3mda,y4i8lu from a sound source the intensity level is 60 dB. What is the intensity level (in dB) at dyal4rx,w3i f2 8uym*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 f.92zztq25sf flq.hbt4c . gui rom a point source is 95 dB. At what distance w5zch uq2lzfstqg b4f.i2. .t9ill 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. What is the frrpw ptg:2( (srequency of the fourth h wrp((gtp:sr 2armonic?

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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 o*8prg0j4z2tia: kh j( kpz7cy pen pipe is 900 Hz. What is the length of the piitgzr: 04z cy* k(j h7p8p2kajpe?

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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 xx6bv9w2 uwg,9tq ,biin an open pipe of length L is 400 Hz. What is the frequency of the lowest tone tb ,wu29tv6xgxq,bi 9what 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 enjs9 (cp2d230nd s f 8+ltplr:q)emgwsds has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is 098spsn tqp2le2dw+m3 jdl(s fr: g)cthe 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 roo:18(e k :f/jgnyme fh3m0ebpom 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 en)tgsbugl8 3 l8d is 330 Hz. What is the frequency)glb38t u sl8g 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 w5o 5 8of / pc3gx7asr5:jyng3,zr bykuill have a fundamental frequency of 60 Hz on a day when the velocitz:ng5arfrkcbj3xuy 8y7,os3o/ 5 5gpy 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 rout17/l uz) d;zhg2ymj9g)rc o 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 the temperature i/t-c8v 7swa kds $20 \; ^{\circ}C$. 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 speed of s3 q drk4 f9.insmgdiu/q (c,-tound in air ismr fs4g.(3k9-ciidn,tqu dq / 340 m/s. 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 other8jg ,jp7k+/ qd)x n voi/qwg)m is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the funv8)7qmj/jq,i xo)k+g / nd wgpdamental 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 :x6(fg, g )mf8 lqeqgqls rj2 *6oitk3velocity of sound is 340 m/s. How much farther back would source 1 have to be moved so an* glgq3, 8geq26lif)ro sm j:q6fx(tk 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 b.*(f8sqdmomp e 4oy w,w.5jtt y 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, whi 8s(.me4jw5 dm fwoq,t.*poytch 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 ol czd;f/ .bh)jf 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 tunzs) l,v e+x*nwe the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is the frequency of the ins,s)wex vn+*zltrument?

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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 produced2diuz + j bdwhe+6is/j7 -b*zk by two horns are 6 m and 7 m respectively. What beat frequency is heard when the horns are sounded on a day when the velocity of sound is 340 m/sjk hd2db7u *bzijz+ie-/ +w6s?

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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 orhff. c59s eaeh ,4oi,xchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentage,. ,hff ei4se9hca5 xo 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 stationary 1000-Hy6 .*x et3ngau:vaxf3z sound source at twice the speed of sound. The observer hears a frequency:.get fn33*xxuya 6va 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 k3tq s7hla9: x2*aoqhHz) approaches a stationary observer at o9hq7h tol:sq2 a*xka3ne-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 mf(zty5 zcj d0d ;m43jgoves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sound speed is 340 m/s.) c jg5mj ;tfdyd430z(z

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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.rxiv6 a4u orpkj2+5m( It is traveling at 35 m/s on a 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 ch6 4xmka5r2ripuo( +vj ange 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 hes j5m.f3o )ll*zyzq/2wmyk y *ard by a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the /sy5wqmlf k *y2zmzoy .)j3*l 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 ydb2mu kc;lx- 6r3p1wqou at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/r p3xw2qck1u;lb6m- ds. 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 trainv)9oja l2 ;rcipxi9a;v.zv g 0 blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do you hea9 ap)i;jl xvz9 0.vi2cor vg;ar?

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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/hd1) h*qmx h+)-lwmpay n9eyk:. The train blows its 400-Hz whistll:m +9 pkm hdh)1-qyxwyn e)*ae. Take the speed 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 at 120 km/h. It blows its whistle, 8g ) sdbr7u2eland you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actual fr7gu2s)br ld8eequency 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 is-h ybz/9zdbvgyrh rsmbs /5)7 i3l ;7n air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train with a speed o by3h-sm 7ivrbgz)/hz/drs5s l9;7yb f 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 speed- jskhh/+ingt;.17 me pofr,h of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approaching the train withhm n-g1e ;iokp+/., h ftsrh7j 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:sv2iu8n +fwr of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the sperfnsu +8:wv 2ied 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 superso0 *ckw 6oxi2bgnic 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 coni t8rsv hfpo450b 91geq pl6rw;n f0hm0cal shock wavet9m0s05b4hr o1qg0hf pep w6 fnrlv; 8 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 flieaxty/,n 6(yst)tki7 ts from the United States to Europe with a Mach number of 1.05 where the aitai76st / )ynx,y( tktr temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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