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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 i- my/0r rpoyg )7dyoc 7;h/ffbs 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 fastest thr9jwp -q-*jol0ig5zd; zxvc+ y ough

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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.8nxh( *;ij qqy kt1l4 mxs ;sy2hh3iy sound 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 tgd 39m*uaj1 rr(4g.ql wg4fmqo the velocity of sound? (Assume that all other factors remain consqd9 grj3ra.g wf4 u1mm*ql4 g(tant.)

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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 asg mt: ;u sim+)pk:jf8 200 Hz sound throughkf8+ :s;pmju:t )g sim 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 avq6:xgu3hlm 1k; t*5vno d9su 200 Hz sound in air lsm;* 13q :5hg9k ntuduo6vvxis

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with frrtin5z wm; yxj/l x;w znm:31jk(0gi7equencies 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 callepkwl m mzzmg.i- ,l2 uz,0r24bd

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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 sourceicfe 5hvj8ta,9l1irht f 46q7 is emitting waves uniformly in all directions. If you move to a point twice as far away from the source, the freque,vjaq7i5 8lfte4h ir16fct9h ncy 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 proportional/z8js y ue7f2l 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 distan-/za*9v.,nyfy i wnoqce d from the source is I. What is the intensity at a distance 2d from thaif,9.v*yzw o/qnn- ye 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 radiat 7vmye 9fex9.l/o jajg,ioj.: ing equally in all directions. What happens to the intensity of the sound? I9f :,jvi.ay/ eo emgojl9x7.jt 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 isv7rdyd xzjc1+cjiu3i+ 656*ns 1peh v radiating equally in all directions. What happens to the intensity level of the sound? It v+e+dsz 7*c56d6u1 p3nhjic jr1 xiyvdrops 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 s8g;) zc*jee(bhyic7epu :7 ua ound 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 emitting a purt1 m+ suv449lx6w+h pa z,cdvwe tone. What characteristic of t h4wpslw 1,z+t6v x4umvad9c+he 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 ay6ew+:i lztz ) 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 "piz8tn k t*.kaa.tch" 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 inwhhd9e(/z 9h :pe2mlf to water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemedu/uu 7*uk;mhnt 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 generatelc5i 4cs- pj yokrzp(pw k4j/i1v65w(d by the guitar as a ressiykor5( zp- p1 6lvkw 5/cwpc4(ji 4jult 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 ends, th qqpi wt ajithcvh0c y1 4po(4(,3io)v03r y8tere

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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 ar+sb tp3ap um8fu mzq0a;c/i :/e the wavelengths of the three lowest tones produced bpz/0 sitp/;u mbmq3uf +aa8c:y 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 hfr(ym j1b/x+is 200 Hz. Which one of the following frequencies will not resonate in the same pijr1h( bm xfy+/pe?

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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 frequency1*nace d a k,qa9b5ay/. Which statd*b1ae q/a5 9aay, nckement 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 opejb;h*oz u4wy 6n 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 the three6tpd 4- vlnnfu.ljdr2/) x c(b lowest tones prodbcr -)tdx42f/lnj lp.nuvd6 ( uced 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 i ,qjihky*-j ; 3i/ce0isffh7 q-sd4usn a closed pipe of length L is 200 Hz. Which of the follu-s0h de;jhfcsifkisi qj37q/y4 -* ,owing 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 p qwkl)73:lf ,qegvar -s) x7zat its fundamental frequency. Which statement is correctzrsq)k lv73aq gx- :lw,e)p f7?

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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 tw xtml:2i oj2p/d; z+i0o3 qer f7skpo7o speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a dayr2 meo0p372; djpilf/s:k 7i+xzoo tq 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 should h2aitb,xv;rau.u5j vfs -s;s2ave

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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 +emp ,znhwd 16and a particular beat frequency is heard. What happens to the beat frequency if the frequency of one of the t m+n1p6h ,wezdones 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 exph tuc,i6(t,/w0 dfelux)v3 tenp 1 ,hqlains

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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 frequency hearjf9r v -h)djnrvt2uj ob87 bur g9;1o7d by the observer isn urr8;g jtbuv1 7-bf2or7j)j hdv99o

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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 a18a onos: 9(tpaq/uzstationary observer. The frequency heard by the observer1snu pq8zoa:t /a(ao 9 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 MA(zi.p e xb,2e 1hq6pkwq4pyn.CH-speed, its half-angle will decrease by a factor e.( .xpp w h,p 6qeyz4kbn21qiof:

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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 i2b w- hhcqglie(k.0 y2s 352 m/s. What is the air tempehw- 2lkgc (0ieqb2.hyrature?

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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 at :ohwbf;c 69n3g.g-qtkbumx ( $0 \; ^{\circ}C$ 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 k6g( h)vjj6 nvwhose echo reaches it 0.0250 s later. How far away wa6v( )6vkjgjnh s 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 4.00 s. The te)1vbe9vb urz+ mperature 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 fj(a 4elpk0u 9jlash of lightning, the distance to the lightning strike 0eajp4( klju9 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 temperature isf. qee1d3(t mvc7yk 3n r*gf(e $15 \; ^{\circ}C$. 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 late ndfn:6 bfljxk +22.x:rrups+r. How deep is the well? (Ignore air resistance, and assume the velocity of soundf2lfrp .d+b:+k2 6uxnn: s rxj 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 soundic 7nw:)g8jta ;gn ch2 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 a0. m 3kkmy 42yztxzz-dir 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 ec45s4s+ufekk r.hr ; 0x 8kxilevel 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 ofxz-ag) t 0e.qc 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 intensity levels of l q(z c d6iz-k3:jes 0oi+nji570 dB and 40 dB6 cljioi(q 5 e:jsnzi3z+ d-0k?

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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 isxj0x;,(yxhv:eu4yfdgsub, 0 4h ip/ x the intensity level generated by one e: uy0, i(dy 4/;je,x0 spx 4gbfhhxxuvngine?

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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 disbg4ct:c11an0( cjf4;(e q6eo qz.u mvcrl, fztance of 6.0 m from a source that is radiating equally in all directions i e c,c0rmzn lo6z fvb4(atfu;cq. 1g4q j1ec:(s
$6.0 \times 10^{-10} \; W/m^{2}$. 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 6v gvtdao52l1 4 w/, z1lncuvc4.0 m from a source that is radiating equally in all direct/n2,4ld v1 cgaoc1zl wu4t5vvions 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 2/iuw.xprlwan ; uel:/9+ nxl 1 mW of power, which is assumed to be uniformly distributed in all directionswnwu ln;/9r+ex l2 /lxapu:i. . 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 from a ba, kwj6e a0z5de6ekth, rking dog. What would be the intensithadk,5 ze6,tk6j0ew ey level 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 from a sound source the intenfg61l 8sa d i k*;lx(k;efh (xs5ad(pisity level is 60 dB. What is the intenid ;65k1 sksl;i(*e8px a(ffdhg(xlasity level (in dB) at 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 1p3 pdnl+8qh hpoint source is 95 dB. At what distance will it bhh 8d+ lq13nppe 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. 38. biz1 wlynphqq-n8 What is the frequhqn8i3nbw 1z 8q-yl.pency of 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 an5ie:;yp4l7 zke mi :ml open pipe is 900 Hz. What is the length ozl5e7mpem : k;: 4liyif 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 length5cpyc/uk;6( f(cvzynb px 4b - L is 400 Hz. What is the frequency of the lowest tonvxf( ;ypc4ykb-6n 5 uzbpc/c(e that 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 m. If the velocity ofhesgkk0) 1p bg;g,g:* 2vqszl sound in air is 340 m/s, what is the frequency of the sekgp;ekb s,g s1lg) vzq0g :2h*cond 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 a79 e:ljzpng mol;,pr 5myx3- g room 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 oxo:e y0 me+o5u sd9w7iz+o7qdp z5hd5ne end is 330 Hz. What is the frequency of the t5z :95h dq7dxozus7yw5e e 0m+ o+idpohird 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 w+peu;rim7 vg7h* euh. *,d n4mhih/l oill have a fundamental frequency of 60unip4ogr7muhh*+7 v ;*.d h/lhm,ei e Hz 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 t-c ,+y6n 2/ lib-r kbzlxwxux;he 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 thzb0 6ff3:)ylr )uxqwj e 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 whenvhfp d/ s2wl/* the speed of sound in air is 340 m/s. What is the fundamental frequen */f dl/w2vpshcy?

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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:2i q5k(: vbdme one is open and the other is closed on one end. If the fundamental frequency of the open pipe is 300 Hz, what is the fundamental frequency of the closed md 5q(2 vbiek: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 oksf i.o0h( 9shzrr45loy; d,c f 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 t ;sr5f9oc id., hk(l4rs zho0yhe 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 by the same ftjdi .-e +u.n klhx0.d cl+b2drequency 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 the other speaker? (The sound spedik .0t j-ul+ 2+elndxbhcd ..ed 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 fs84 qa8aqx plq:csu8 8 7ncv+trequency?

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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 tunitep.+17 u, gl kzqre7ing fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, what is eulkqe,7r pz+ .7 t1githe 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 cwb9m0o6nu; (qcri8f 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 wboc8 ;u9rcn0fi( q 6msound 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 string/wvcpor2i)gk+ b0 jc0s on two violins in an orchestra are found to producekc cogi2/ vbrw0p0+ )j 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 /qsd-lmo(lt42ta( .g n xls.*1qocga the speed of sound. The obs(1d l2qxalmqa /-c. n4g*go s l(stt.oerver 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 (normknaq,+3oab :sm, rge:al frequency of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer hears a f : m:qoabe3, +nkgsr,arequency 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 moqke u-e0e6x- 6e5qcqx7;jfqw ves with a speed of 30 m/s away from the source, what is the frequency heard by the observer? ( 6 5c-u qkexw qf6xeeqq07-e;jThe 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 is4pe-3quqhq :w)i ghu0 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 isw qq- qpuehu4i0h3 :g) 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 stro b,c/-ptd7c+lw y r(ationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn /lbwpcyr+rc(o- 7d,t 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 trai 7dw, /emmb-j +zruxuk4cys82n blows its 400-Hz whistle. Take the skz u msdcm7 84b2u-xe,y+rw/j peed 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 stationary train. The train blows iqmky+abo /-um ,zxms 5 j*h)kk9px:5dts 400-Hz whistle. xmk kox5y:zpqauhs,mk-* d)9mb+/5jTake the speed of sound to be 340 m/s. 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 awa ll/-3b is6tzky from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to bet/is-lkz 3l6 b 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 fb,dy5.tg:mw 9f8j rnarom you at 120 km/h. It blows its whistle, and you hear a tone j:m n fryb. d8,5wa9tgof 400 Hz. 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 of sound in air is )nfz1;5 o*jkqv yw7gx340 m/s. What is the frequenqk7yx5g)* znof1j ;vwcy heard 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 horn is 500 Hz. Assume the speed of sound in air iso+ 7gmxz2il4n 340 m/s. What is the frequenc loni+74 gzm2xy heard by an observer 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 sisma4 -(g*s6ezb y4j yjgnal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fastz6*s bm (4eja4 yyg-sj 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 wavz4ncj * (xq8)nxedr m8e 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 the halwtb22 s5 jhfn/iwic6p,f;lf/ f-angle of the conical shock wavnht/wj fl/i;2 ffwbpsci62,5e 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 to Europe wi 3gwer8jq:)foth a Mach number of 1.05 where the aij 8eq:)fo3g rwr temperature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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