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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 isc3. hpc5+;ax4;s nuuw6i 2az hyb 5sup a false 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 fawsl pbh 7x/2h*stest 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 steel2u h7 u9+ nm/ehv4f bohxsbf:4 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 increases45vi+0+k3mx wve pdcv8l l +ms, what happens to the velocity of sound? i5d3 m 48 cme+vx+ lwvp+vlk0s(Assume that all other 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 om foqnw r*4 w:5)i :qcr:;crlaf a 400 Hz sound, the velocity of a 200 Hz sound through air4 ow5aw nmrr:c: q;l :i)*frqc 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 206 b7sln idk u9nxu j-j:-25k,n,x d0b4knpzlm0 Hz sound iudnb ,lx-2 lsn i94 ,jjz7n0 xdm:5kpk-6unbkn 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 frequenql 2r8wp gyo0d 2k*xl3cies 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 fr ;mlg:btdw idq)w *3v:equency 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 ce l 1b(qy cjbrm:ib8zvh+2.9uniformly in all directions. If you move to a point twice as far away from the source, the frequency of the souc 8c.zj:(v+iyhm 2qrl 19 bebbnd 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 proportionalh9v ys6bd.txa2qt 5 2d 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 sh;h sje)uzj/2fgfs -2 ource is I. What is the intenfhs ;/z 2ge -)jjhs2ufsity 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 a sound source that is radiating equall lmi;,yb kf.o*y in all directions. What happens to the intensity of the sound? It reduces toy lom* b;ifk.,

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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 is radiating equ/.kt el-faq,p*y i(lm ally in all directions. l/- le(may fi*, t.qpkWhat 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 becomes louder?1tq )qo4nxru(

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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 emitvd 8;0 a8wuastqg3 lk8ting a pure tone. What characteristic of the u8;vadak8gl3wt08q s 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 rl-;qxy hq3m-yy em )c6ft+a2 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 note1;tdtu7 czi.vkaa.8w?

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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 +s/hhz b4p0 0mgtv)/+eo0/qeumyy we 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 k;)dau2xymi : 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 strzqat5 .o-i g.v4w or9ling and the sound wave generated by the guitar as a result of this vibrati l45rq.t.o9go zavw -ion. 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*15i zj-dprzg1v4vv vs 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 wavelengrd 7j1p7wn: vlp.a3q eths of the three lowest tones produced by this pipwv1.r7 37en:aq ppd lje?

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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 Hz. lxx4e5rjed31 y;a4 v y Which one of the following frequencies will not resonate in th34lyxyxj;ee4 rv 1d5a e 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. spkp+ ga 5jzo or2/n.;Which statemzjo/ 2n.pgrk ao+s5p;ent 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 endr xq 2dv ivczsb7dy9( +r056 1xvjro7o 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 thewexx/,i0-yly l4(cjg wavelengths of the three lowest tones produced by thi,-y4elx( g/i0xcylwjs 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 200 Hta02 kfok f7z)ip id(kn4 u,r:l.o -dsz. Which of the following frequefi in7zk -d u(otda,oks:. 24rpk )0flncies will 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 fund w-lu2tw8pj1e/vx ph (/uwm 8zamental frequency. Which statement is(e2m8wwvt /luu1 hwx/8p zp- j 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 same source. Each spta:n qv*jrnx6v+s )68q efzc6 eaker produces a tone with a frequency of 200 Hz on a day wheznq+e6af :cvvtn6)rs8 qj*x6 n 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 bea j-o,e/i-sn pzts, the 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 sounded together and a particular beat8hobry q1tb+ ( frequency is heard. What hbyr 1 b(qo8+thappens to the beat frequency 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 expla3orf61 ml9uf eins

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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. T/+ 07ci7wwt 7wdx:g3ep gjr duhe frequency heard by the obs du/+ w0cg:we jix7737rgtd pwerver 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 fromt7rp mu9 6wmaonqc(,1 a stationary observer. The frequency heard by the observer iupc1w7tqn(m r 9ma,o6s

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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 MACHlqkd(l9yo pklxs-w e.ex ;z 9 e,yg n:ak,12;v-speed, its half-angle will decrease by a factor9el;x,kkxys9d, nw;:o.avl( - 2 1 ezyplqkg e 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 ultrarv- uzr8(wfpfib*k3)d (z5ahsonic sound of frequency 45 kHz in air is 352 m/s. What is the air ) hkpbfw -iaf(r (8*drv3zz5u 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 atlmczo4caed6li-0,rc d 7c10 cfbc o2, pm)nj) $0 \; ^{\circ}C$ 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 whx(er8pc() eb, fi8s -(h zl8axd hxc0mose echo reaches it 0.0250 s later. How far away was the objec,cmxz(rfe x(sli8 e)(8 a8pdhx -bh0ct 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 te /gyex40 6qge ai;ieenf8eq/r k72c:smperature 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 distance to: oo 1l. iq k0d8+io8 ,feknufqid ra6-ahf)+u the light6.o1du o, arh+nkof+ au):qi0iile8 -8fdkf qning 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 thend73h: jdqko. 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 well and hear the splash 2.5 s ld)(cfwz2xp b ;9a6gtxater. How deep is the well? (Ignore air resistance, and assume ta) c;dpx2zxf6gbw9t ( he 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 frequencyp*:h chr*h01 tnlm2oh fj n(y; 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 m 0z;f7hdtsmu5b3i4b 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 of a sound wiwwqd *gus1yfw752px 3 th 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 ah3h4zs:d .jqa 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 intedwg-)dmpj+e2 nsities of two sounds with intensity levels of 70 dB and 40 2d gw)djm ep+-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 yuy rxve3ys: rhz7r w/0i,cgv/ :.x*h the intensity level h ,u7ix vy.ryy0rsr/zc :egw:/hx v*3generated 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 *;gimvk1ll- m from a source that is radiating equally in a-gi 1vlk*mml; ll directions 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 2egn)p8v oi 59u(z,d-m:n hcpn4e uh gm from a source that is radiating equally in all direh:p 92 nn) epid5g84zcn,u- (hoegvm uctions 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 assumed to be uy83ygr d :r;fdniformly distributed in all directions. What is thgrdyrf:; 38dye 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 from a barking dog. Wha3,33owgdx4dwp7ix pu1 jn 1mk:rtk 0qt would be the intensity level if two identical dogs very close to each other are barpn wxw1mo 41u,37iqk j: d3dkrp3gt0xking?

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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. Whal.ujc 8cv2 2wuzh3 03 qvkykw*t is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiate2*z0 2y3.w whccvv q ul3kuj8ks 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 souj8v )oe csgtl/a+c*4gyx xp-1 rce is 95 dB. At what distance wl+pxa* sgcc tjxg841 e- /yv)oill 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 arwiub nv;:)s7 complex tone has a frequency of 1200 Hz. What is the frequency of the fourth harmonic?:i)bun7 ;svrw

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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. What is the lencyyt, 51 j4tr,mjf1i wgth of the pipe?,wc5f, y 4i1tyt1 rjmj

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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;c jt itkk2(z+ in an open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will re;(j ktzci2k+tsonate 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 v;bfvpj -+k *s0.80 m. If the velocity of sound in air is 340 m/s, what is the freqs ;kfbjp+v *-vuency 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 tiv0q03em cdp*d xdq u)k*vx-*bwkl 4 9he 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 end is 330 Hz. What is klfzw77 +e ,o6l/r09n kz zwzhthe frequency of the third harmonic?zzh kllz 6r,ze+9o/7kw07nwf

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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 en i63(ufd hhfs2 l5bl0 *+tpfuqd that will have a fundamental frequency of 60 Hz b 6h f l2+dfitqhlf5p*u(s03u 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 room where lf9rw)evmdo6ti67p. 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 t:1atzbcpnly p09 ,fr 3he 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 speed of sound in air is2)n)ain rp3qe 340 m/s. What is the fundamental freq 2ear i3n)p)qnuency?

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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 othe zk)itf dj4j/2x)i ig)r is closed on one end. If i4dtj)z )fxj i)i2gk/the fundamental frequency 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 frequency of 800 Hz in air wherizufqe8yva 5b jn5q:5 ve22-te the velocity of sound is 3vi ujq z:ebnq82ay5v e- t25f540 m/s. How much farther back 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 side by side and driven bym grt eo*-24hl 1 *hwmb4wo)mn 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 possl4b whmtm*g h*1rmw- 2no)4eoible 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 beat. 6 xl6m+ up fudk9qffo-;jzx+ 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 550ha83(qznnww )- -rfft-Hz tuning fork to tune the frequency of a musical instrument8a3 hrz--fwnwf (ntq). If the tuner 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 so9oc. 6jr(depel7:a v bunds produced 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 vellj v:bea67p(e docr. 9ocity 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 iq ;8*pm5ffblmk y 0g/fn 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 ty*bfm k5lm/8p0;f gfqhe 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-Hz sound soujr.,.5:n3b ojhb xuo brce at twice the speed of sound. The observer hears a frequency x :n3 rbu.bj,oo5.h jbof

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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 Hzdz,l)rq; yn 2q,q9 gkquga 99w) approaches a stationary observer at one-half the speed of squng ,q 2qw l99da)qrg,k9z;yound. 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 10d1a1 pr0u f. 0oora4zd:lj-v d00 Hz. If a listener moves with a speed of 30 m/s away from the source, wdo lo:rajdp .0zad1 40-ufv r1hat is the frequency 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 *vmqd .29ul2g amvu0 jnx4mj3800-Hz siren. It is traveling at 35 m/s on a day when the speed of sound through air is 340 m/s. The ca*u g9uam xjmvvjn034ml. q2d 2r 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 a trainbhc svk,k ,vx9v2pl7(v;l /: e pqbx.w approaches with a speed lcvsx: k vh ,kblevb.,9/7wxq;2(ppvof 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 12tarp37qyyzi lu nm q2z dsz)pavu )*9 rb:-::10 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. Wh s:a7ipp-zuby3 y*zv2q l9d)t:rm) zu1rq :naat 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 bw6 l/imnfga 82lows its 400-Hz whistle. Take the speed of sound to be 340 m/s. /f aw8imn6g2l 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 bl3j,t2fwb hp 7qows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequencb3,h q27jwfpt y 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, kprj-v /zvwh ,,(d0p .trv-ny and you hear a tone of 400 Hz. -pdr,0k,wv.t /yzvhjr(p -vn 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 o(poy c921tis7r8qi c of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the tyc 8 oic2t o179i(sqrprain 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 50 kjg6v(2wyqk 70 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is approac2(qgkk7j wv y6hing 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 deter1m/2o v kih* cxuh;-ocmine the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is retuou km1h; i-chco/vx2*rned. 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 sf:6j0z-uz,eat wpj q6 c 8-nda2x6cdwhock 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.)9vfb:nh zjk:; 4btme 4. What is the half-angle of the conical shock wavh m:n49etbbk; jz f:)ve 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 tc93+m )jiw m ah en1r;1qoy/wfo Europe with a Mach number of 1.05 where the air tempera qimw3roh9y n)c w1;m ej/af+1ture is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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