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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 i9tdngfi71(.dya qr* -ftr1cms 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 conduct-s 7m m4ig6b8jg3e-o3 afr p)npz-ay jed 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.eraql9nar5f z oo0 14 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 thez9r/d/f qcy b1 velocity of sound? (Assume that all other fabf cz1dy 9r//qctors 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 velos,q96 5fp mbfycity of a 200 Hz sound throufsq 5,m6ypf9b gh 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 wavelength of a 20ac 6:4ac8 ilahen5ff 00 Hz sound in aac: 5hl60a f8f4ncie 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 fre2t5:-p/7v0vyu t*e brf o w iegz2c3lfquencies 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 20 Hz are ca67 zvo lt5w)ozlled

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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 wavenz0bx .o7 -(g-xiax aes uniformly in all directions. If you move to a point twicezi.b -a(g0a7o-n exxx as far away 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 d ;h,vybg.ad)ca8 fd6, 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 source 6 p5j)u3mndg * /ixzzlis I. What is the intensity at a distance 2d from the sourc5lz /*ipgxjz)dum n63 e?

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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 equally i 3fq ad2;y9mdkai0 e6zn all directions. What happens to the intensity of theqaf 0amydzk6i92 ;de3 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 soun. w+fj(u9+am v7p jdey4uc2bxd source that is radiating equally in all directions. What happens jmc9+v(yep 2bxwu f4 +7.uda jto 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 becomesn/fjjq8at /0n(3hwdja qab*qm7f, *d 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 speagx msd,z6* o:gker emitting a pure tone. What characteristic of the sound increases?6:dgm z,xos*g

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What determines "loudn1 tc-m/tben7v,zg9 c. )uvjjx ess" of 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 musical notem6e )0ja4lh bdq, xtj/?

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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 wateri5s+l;t+ no4 +cvvuhaiv/ji -

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacewrdd3vz ::(o dment 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 st r4d;pz:k3lssbfy ;:vring and the sound wave generated by the guitar as a result of this vibration. What ys ;rp: d;sk z3l:b4fvdo 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 ends, thernq+c yu+e /a7..dcuiv e

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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 t- n)ag8 ) z8hobbthx0xt-d 3fch: x/kdhree lowest tones producf0xzh k dt :8xbhod3)8tbcnxga-)- h/ed 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. Wh7la/gvkje 4apb(e 3o 7ich one of the following frequencies will not resonate in the samveb7/ 4pga oal3e7( kje 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 resono ysqdw0 outna1* ac49 d8*jn/ating at its fundamental frequency. Which statement ty *wajnu/48cdq*1d9 o s0an ois 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 ds.nxr3 l 79bqwhich is open 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 wavelexiyr7r6-18ndp wd54 iiuq dmlt(o.5ingths of the three lowest 5w(i16 xm5ti 8-pd d.4rnirl7 yuioqdtones 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 p uvn*x +vu8,rmipe of length L is 200 Hz. Which of the folv +xunum*rv,8lowing 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 is resonating oqa;0:bhrovk2sf 4ma ,i1g3g at its fundamental frequency. Which statemensoq o2k,hagvrfb: i30gm;1a 4t 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 drivenehw wjmf+1oa-+v17 h149xt 8je udbva by the same source. Each speaker produces a tone with a frequewemah41xvjf1 - 8dj w+h+197o tabuv ency 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 waves soj0*q a ij( k* *w5mfqc1d/eklhould 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 id03,fa49)p4x x dj,zeu vw03cyq iyktogether and a particular beat frequency is heard. What happens to the beat frequency if the frequd 0ki9u,dp3xa3ez fj,xw) cyi4y0 q4v ency 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 explainspwzkxaj9vx) dx* +bk9,*gw b1u3ty y4

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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 frequenr 6 0kv4v(ez +hh5vp/lbt+mmrcy heard by the observ4 mem6vl+ br/zph t vhv(5k0+rer 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 stationary3z*lz7ki- 6w v9pgg pj observer. The frequency heard by the obserigp3 w pkl9vzzj7g6*- ver 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 decreaob) 3d zuw vm 65rr ,hv54in3jrjv(5qmse by a f ,n 3dr rv4h5)w ozm6jjvimrq5(5u bv3actor 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 frequency 45 kHz in ai9cnzui0r 85aa apdfu1mb 2p+0r is 352 m/s. What is the ai1+02 cpa9mu r nd0afb8apuz5ir 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 th0bfl)3 t/csg c+ j/g8fh lkem4e 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 speed of sound in air is 340 m/s, a bat emits a shriek whos2ymr49qy c4z wa/0g kkuq2ohq ) )+qhie echo reaches it 0.0250 s later. How far aauc02k/oqwg + 4h) rhqyy z24ik)q9qmway 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 heam5 r)py0m8 plg9gncr t3)xt9qr 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 seeinbg7 i7sf( g+rgg a flash of lightning, the distance to the ligg7r+7s fgib(g htning 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 frovchz k8-t wv7 6yz(oy-m 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 well and hear the 8.1u p) f0rgqrsgknm7 splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of sous1.k7gf0 q mgu8r )pnrnd 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 freque h5jp0az :4bc;gly k)bncy 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 airttm sa)q0 v19y 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(k5rjp p(m*tbthr 0 -o6tlt; (qkcm2d 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 soundav/g2e h99ch a?

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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 intnq8yn ,.4l,in vq+udtensities of two sounds with intensity levels of 70 dB and 40 d8in4vq,ut+ dy,n.l qn 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 inteyyaypa,uolv8+v ad.z/)4 73qy6q wd pnsity level genpa d.v zaqp ),+woyal8 yqy63v /uy7d4erated 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 sourcewz o* p48frd,c that is radiating equally in all dir*f ,dwp84zocrections 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 sourc(g,n8mwq,qiy. clp2u e that is radiating equally in all directions ( 2n,wc,pmuliy 8.qg qis
$6.0 \times 10^{-10} \; W/m^{2}$. 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, w4ej:)vj);zve 6ph kay hich is assumed to be uniformly distributed in aj6h )vekj4y ;:a)pvz ell directions. 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 is 65 dB at a distance 5.00 m f0zw enii3;mwf)74nn*uw/mfo c okkd(.r f, y.rom a barking dog. What would be the intensity level if two identical dogs very close to eff3n0wu7*4/o. )c kr(, d ;iimonwmy nfkwez.ach 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 intencx 5t/c(zfkuek1.aq 6sity level is 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiaf .uqze1a(6/ck5 tcxktes 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+v5o+fznpp mie(,w(b point source is 95 dB. At what distance will it be 75 dBv oe(,p(+ m5bwpz fn+i?

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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 adt /5b2 vlrx*4n+gwm9wwr f1w frequency of 1200 Hz. What is the frequency dwgw9b fwtxr*l1+m rn 4v5/2wof the fourth 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 oux0t,v/vj p: eyi5*v is 900 Hz. What is the lengt5x vj0v:/ y*tepuio, vh of 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 length L is 400 Hz. What i;e1 m y:vayzyvv*k+-z s the frequency of the lowest tone thatvz1+ye-vvy :z;a ym*k 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 of 0.80 m9j yj,dgs tj5f jg ,/n20npv+c. If the velocity of sound in air is 340 m/s, what is the f,+/,tgsv jjg f9dnc5ynpj2 0jrequency 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 tempera-a2h ym qwq3vb +- pn1qe)mt7sture 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 the fctsf+o 6194v m.lxni 01iphfb requency of the third hfi n i40h9+x1t6s1lm o.cpbv farmonic?

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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 i gxw3tf swoqo,).8o 76llm8xone end that will have a fundamental frequency of 60 Hz on a day when the velocityo,6wwxsq )7tl8 f 8 ixoom3.lg 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 cdwyt4mo,-(-xap9 x kroom 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 te(4plizbq3 t 9 ,uhs,oemperature 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 spee(zog k ,a*5ygwd of sound in air is 340 m/s. What is the fundamental frequency?( o5*ygz,awk g

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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 isi+x ;vwh8gq,a t6 a+o o ke;osgdko07c2x3m g3 closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the closed +hexg;0dovo3mso 7wtaxg6g3k k8 2 +,;caoqi 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 ul)c w dmec9h15li qe) :934ki(ey6nrjw 3cpain air where the velocity of sound ckpj (u:wda ce 4 6wy13cq9) hn)l erl359ieimis 340 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 tmh0a v +tscyd3.h)gt0.c( nc 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 a possible3c0syt n hht.gc. mc()0avt+d 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 t 05+ sg(g8p9kb njme4lkqdr;nsfy*0Hz 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 v4 nkn*w8*1gir pa 2inof0qt5tune the frequency of a musical instrument. If the tuner hears nko 4f*nn12 rwpv5i0 tig8aq*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 m and 7 muqbs4 (c++fqv dkzs 2: respectively. What beat frequency is heard when the horns are sounded on a day when the veloci+kszqds+(vcfq:ub 2 4 ty 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 vio+ ,et al/gyn-ulin strings on two violins in an orchestra are found to produce a beat frequency of ty-u/ganl+e ,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 7-o aikrkkvlh 2age 5(*xaj1+sound source at twice the speed of sound. The observer hears a frequency vka 2lka+i-*jke 1or(hxa7g5of

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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 statioqar pakdev;4 rm*/ggh3: b/ a+nary observer at one-half the speed of sound. The observer rkarva g/ +bagd;meh3/ :q*4phears 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. Ioyk 1agxq9h v q;*of).f a listener moves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? (The sqk ovfg 1)ya. ;hqox*9ound 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 mazvn*nxsf(l s9vc: 55-f wts)/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 change of frequency does the cnfn:a vtwvs s(5z- lxf*59)sobserver 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 o c unc2-f8p +*gddeu.w -9gostbserver when a train approaches with a speed of 30 m/s. The frequency of the traing8u- -o*enwfc2dgdct .ps u9+ 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 towa tlvf :ud,bai00t:fs.rd you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. b.:tilfdufavt,: 00 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 qlm im3gt v:uq347xido38gq5tionary train. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. ld g4m7q:tg3v m3x5q iiqo38u 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/9hxohly;k o/3 h. The train blows its 400-Hz whistle. Take thy 9xlh /ok;3hoe 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. Ite)quj5tq tna2j4bn)3 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 frequency of the whistle?ta3 n45quqjj)2eb tn)

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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 o*9h cmqg 8kdl1ot3-iHz. Assume the speed of sound in air is 340 m/s. What is the frequency 1oco3l*kd-g 8t9mi h qheard by an observer if the observer is moving 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 hoaojoi 9r57uzyz fp:3. rn is 500 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observeazyuf :. 957izrjo3opr if the observer 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-kHz j66qm dl(5c8kovcum6signal is sent out, and a 42-kHz signal is returned. Assume the oumql5c686(mv jk6 c dspeed 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 shocus- qi1v3jpt -k 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 spee0lgy ph/6wzw-l+t rfs 6fs73 ed of Mach 1.4. What is the half-angle of the conical shock wavpff0w l rs6s6/t 7h-wgl+zey3e formed?

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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The Concord airplanefxl );(lo h;kg flies from the United States to Europe with a Mach number of 1.05 where the aif;)h;lk( gol xr temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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