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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 qo;-ec sa1c 1hjod u8-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 cob; /cfhvvtgs 69gz)f(yb 6 d0anducted 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 sod ht (/c6bg+ru.y n*llund 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 to the velocity of so60rd*. woqrycln u4lx s n(-b9;l9nksund? (Assume that all - .lcl 6 rqlnyxkd9brus0n ;o4*(wns9other 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 of a 400 Hz sound, the velocity of aelzhll2(b659q q uq/ m 200 Hz sound throughlbhzeu(m2 /lqq5 96 ql 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, the wavel byyi/:x8 v:tzength of a 200 Hz sound in a8i:z ybvxt:y/ir 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 kwu 5gbcv1i:e7q9 w 6bah(x /cgreater 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 20 Hz are calle.z*.amvs1i/ hgvbnwa k -2ua2 d

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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 emitwqm39gvn f48 lting waves uniformly in all directions. If you move to a point twice as far away from the sourc9 fvnw8gml4 q3e, 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 divergin: tty+;fqn ci:g waves, 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 souu-3+lytkv 2t3ea / cdf /yi6exrce is I. What is the intensity di/3 6fyvu ate-yk2l+c e/x3tat 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 sou6s8 io f0uoolw2f7n3s 3e :msxrce that is radiating equally in all directe so2foo3 l3nssu680 if:mwx7ions. What happens 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 is radiating equally in al2 p2dbhsk2jzr,f w:( vl directions. What happens to the intensity level of the sound? Ij2,h s( fd22pvk:zbrwt 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 increaseso+nb(:1 :z whinub+pb 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 toward a speaker emittgv*hgz2we 5rm )sj8gudt-m3 ir637bzing a pure tone. What characteristic of the sound increag2tg ri3u7bg)6e s z5h8vdzjm3*wr-mses?

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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 note?1tgvh0u* tb6 c

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines the "pitc2b-t5b b ubfk*6jezt k1 )ub:ph" 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- cia5pswgh, y4o/.mx 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 arec 4ccmf(tnyyhrz +dw;, 56pnh /eu5w)

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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 generated by 1 vnjspo.v6 r,the guitar as a result of this vibration. What do these tw.rno 6sj,vv p1o 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 ends,h/jlvq no4: kh((af/r 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 d ji))s,umpj*of the three lowestji d p,))um*sj tones 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 Hz or 3,3bq8m r(*z 9mtofbfse0q. Which one of the following frequenob r9sm0q o*t 3q8 zem(3brf,fcies 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 res ft7blm26d( 8i ju3 lcfz*lpum;:4i ydonating at its fundamental frequency. Which statez *ijly:68mf u dbltc 7;f43(i2umdp lment 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 o4)sh i2uos8y,i b2j dl1lhkz. pen 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 t5de1vg 5m9pz;nyn+ntu;nl 9 vhe wavelengths of the three lowesn gz+dn;l tyvv u5m;e9nn1 95pt tones produced 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 z;opgv+y ,mx 4o)u eft0*w2tw is 200 Hz. Which of thz;t) ,mf4+pxo0vgu2t w* e wyoe following frequencies 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 o /)bahzoat-:f7qn/nis resonating at its fundamental frequency. Which statement is cn-nooh taz:f // a7bq)orrect?

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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 bis0-l-+ld ayk-(wxz + ksys x+ ,eldg:y the same source. Each speaker produces a tone with a frequency of 200 Hz on a da(k 0el+ ,x+lylssya:d+ wd-ik-zgs-xy 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 bea4bufyrzlg io-u60 :b,x)sv,dts, 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 beat fr 2/l aosjf jt :n:azf,,qxp(n1equency is heard. What happens to the(jxfn: : 2 t1,,aqoj/pnazsl f 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 explainsi-c6m* xcse 5a*p( zayio:9m)x n5qxy

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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 frequenrxrj+ r0x w/sn ;i::l.bfv9u2a- awgtcy heard by the observer i r;:/gix:2+fa wuv raxj0b-slw.9ntr s

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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 observerwsv +8ei:; f+s hyok5c. The frequency heard by the observer c o;kys h+8wsf5:i+veis

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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 tojhf 56ix8k q7x1yur 3:x4qyyh double its MACH-speed, its half-angle will decrease by a factor 4:7yy xufhrx8k5x6q1j3iqy hof:

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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 is 35plx9 q8nn1a:kncm4 .p2 m/s. What is thcnpp:a41.8 m9xlnkqne 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 the speed of sound in air 3pmhwgb ej, ucrw j8d :h9joyt(6)1b 8at $0 \; ^{\circ}C$ 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 u.+c t1 nn3zy 8at ,tl1osx0oswhose echo reaches it 0.0250 s later. How far away was the object that reflected back t1yost+t o1 t.38ua0nl, xcs nzhe 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 thejehtrut 5qg d7d6 2h5) 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 liqofb7og9s+mlbw:( 9tghtning, the distance to the lightning strio97ql 9bfgs (m b+two:ke 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 rcqf2-jr :s/y.xj4j itemperature 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 hee:zy n 9 x+c7aw*ufkk5ar the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume theu kw*cx7a:+f 5zekyn9 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 n(q aq-(a:czxl67;vj ,,)rhnbxw skva 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 idtc7gav:nbd 0 7 8y6yls o14n$23 \; ^{\circ}C$ 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 soun wq;j:jr1 sgc+v:d am:d 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 b3v9(0qcrf fv?

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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 ip-vre/ aia7n7hlj 4j 8ntensity levels of 70 dBrpah/8liejjva 47 n-7 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 v; rwx3je/0 vm100 dB. What is the intensity level genjerv3 /x vmw0;erated 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 equally in.b -wa3qqa:f;x(zw uylob ;; m all directioy:amqx3f;.u ;- l;wbz waobq(ns 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 ttjbl7s0jc :x pmmy2ff: vg535hat is radiating equally in all direpb 2:m3fjc7 50flsx y5:mgtvj ctions 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 delive4n (adfiq:2 xwrs about 1 mW of power, which is assumed to be uniformly distributed in all directions. What is the intensity lef4in2:wd qx a(vel 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 5zzo0)k ewmgb)* 6ifni:r2z 8j.00 m from a barking dog. What would be the intensity level if tw6iewz8*:ifzgjr)n) zm 0bo 2ko 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 dB. Wg;f(9 0cwyp3wi (s mvbhat is the intensity level (in dB) at a point 2.0 m from the source? Assume that the s(ys9m(3 gcvbw0;fp iwource 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 s4g,fueiv-f0 z, 8iv pis 95 dB. At what distance will it be 758iiuepzs,fv,0 - 4 gfv 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. Whfrb oce *x2* za*5x*7f*vyatzat is the frequency of the fourt*5f7av*z *t cxyzf*o2bea*r xh 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 pip nx:8txf( r1bue is 900 Hz. What is the length o8btrx (:ux1nf f the 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 yd7u+ 1y vp mr8ej(y6slength L is 400 Hz. What is the frequency of the lowest tone thauy 8(16ymjdr7epy + vst 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 (l* 6*a)qjr asbyqd fi3+ xv8xof 0.80 m. If the velocity of sound inq x v da* 8axlq+rijfysb*)36( air is 340 m/s, what is the 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 room:+g-y 0 k(pzwhup+ qfg 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 end is 330 Hz. fp f t*y2awjbpbdi0.tin 3c my3 )sd8yr30,4b What is the frequency of the third harmoni*i4sf y.d ntwyy00b d3 ),b82mf tpa3crpijb3c?

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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 thypt- nl 77 )el*ufcbmsup c./ua.sn9*at will have a fundamental frequency of 60 Hz on a day when the velocity of sound is 340 m/s?u cs7ec9 ta u*/nnl.-sp) mplu bf.7*y

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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 le zd-o2 .fdx/na: ehcs*p;ltr r:j- +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 wher u*d tvkt*w4z7ah+oy /e 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 plah8a w* sqb5jrocu044zyed when the speed of sound in air is 340 m/s. Wzwq5h 4 84rauob *jcs0hat 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 is1, (rm.0 yog n s sls9olt5y,lxozq0y. closed on one end. If the oqgyn ( s0yltl,z1 o l. ys5,9.0xmosrfundamental 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 ,vl o7wf8 hny9s l,hjmg*9nd(a frequency of 800 Hz in air where the 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 sources would hear n,d8l,nf y7 m9s h9* nlgjw(vhoo 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 by the 2g vt iw:s2df6o5 +tghsame 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 2gt +vd5o :2fw6stihg 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 ft+kc:bo8ef ,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 t.hn(- 4 5mo4agdfqj fuune the frequency of a musical instrument. If the tun oa-h qjdn 5.f(f4umg4er 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 pr aim5h9j:g7pk y3qg1j77 m8 j5ajs evpoduced by two horns are 6 m and 7 m respectively. What beat frequency is he ve7qgmijg p58h7j7yk3aaj p9 :j m1s5ard when the horns 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 two vgdxa( m*sdq hj yg.v8*)f)o3violins in an orchestra are found to prodhq*x ) .jva8d)f vgs3g m(ody*uce 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 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 source at twice the speed of s+ua /xbo3ak7qo+atk 6u/aka batq6+7+ koxo3ound. The observer 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 on drqpdqwz(f-1 sg/9 9lin)9jf 1000 Hz) approaches a stationary observer at one-half the speed of soundqw -)izl9 d9rj gnd/p9sn1q( f. 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 s gt ih+n4e*bw:7kaw1 qpeed of 30 m/s away from the source, what is the frequency heard by the observer? (Thwt1*q:e +bkgn w4ai7 he 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 day w43diutvb1go .hen the speed of sound through air is 340 m/s. The car approaches and passes an obsevi ut3.og4db1rver 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 obser5cd7;y/g iw urr.i+jk w:vzc. ver when a train approaches with a speed of 30 m/s. The frequency of the train horn is 600 Hz and the speed of sound i ik;.+dg5uw7crz/wi.cvrj: ys 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 400-2q-uv v2v4gkcmaro7q * 1:zv yHz whistle. Take the speed of sound to be 340 m/s. Whz 7g:m1ru*yka4q -o2 cqvvv v2at 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 blows i9 klwf,9i,;l 5 vaappxts 400-Hz whistle. Take the speed of sound to be 340 m/s. lv,95if,akax pp;w l9 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 j.eowu:j ) /q,bu/gf gfrom you at 120 km/h. The train blows its 400-Hz whistle. Take the speed o: j/w .jubq)u gfg/e,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 awah 08ua. pkl8jry from you at 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 actuhj8 80aulkr.pal 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 hor0) m .aytub:xrn 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 mo:urt0xyba m).ving 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.7i 1hn5a3okpl 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 13 7o5pniakhlspeed 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-kHz signal is sent 9lcl/gzzh5u3 uc0u4x5. hk x1t xgj5tout, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fas/14 uxk 039ctxlgg55tcuuxzjzlhh 5 .t 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 supersonic aircraftp7 r ecv;w)3iqb yss3, 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 bxvl*vq*em q +;w* tw-Mach 1.4. What is the half-angle of the conical shock wave fv *vb qel*q xmww*t-;+ormed?

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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 Sln: ybkffu0nqq3e ./ -tates to Europe with a Mach number of 1.05 where the air tempernqy -.n l q/0kubfef3:ature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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