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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 falwl8czg +2t9hje3fwz8 ; (bv kpse 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 fasm y2fuyi1, lr 5wby1a.4vnw 9etest 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(zk)dccxfv;k 9/i4f/, s wcjd 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 to the velocity of so/ e *f.vd0kgj(uf 5n 8rogeu-tund? (Assume that all other factors remain constant./te j u08.dukro5 nv*( e-fgfg)

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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 soun;rn :o mr;5ecu eg78oe-r xziyo+ d7o5d, the velocity of a 200 Hz sound through air - 7zyeu ;xm5:87n;e 5e+godrorcio oris

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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,- b6ms8j krey(jy w,h sound in air e,yhm r,-w8kj(b6sjyis

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations with mvzz/ar9bs1hi;wn/ +v 2): qzbnvhc; frequencies 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 sn2 r4y qmbs1d- qxol*0.fc2fcalled

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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 uniform(s g w6y7n nekt zzz2*bwj(:l1ly in all directions. If you7(nzj(e g6bsl *k2t yn:wz 1zw move to a point twice 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, intensity iss7.ytnbyfw1 h),q h/h 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 sour76n)cnu07u g kk bvt1qce is I. What is ttn 0kcu ug7k7n)v6bq1 he intensity 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 reb :x3va2 eh:eadiating equally in all directions. What happens to the intensity of the sound? 2 e:evex3b :ah 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 xq kb*u+ljqf4 yjv, q(v)lws8k1,dk9 that is radiating equally in all directions. What happens to the intensity level of the soyk+1s)qj( u4qkbf, jd vx, vq8ll*w9 kund? 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 beco-mqp84jgwq+ nuz tq /v2 q6w-ymes 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 pure tonj b y9j./cqc:irdg9 a:cg+n2ne. What characteristic of the9ydi:2cbg r c+/cnqag:. jj9n 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 "loudnessga8z1vc8jgt u8roc 34" 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 "pitcbs 1pyol89o3a h" 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+( 6p ut9t(d6xv2e4 fkbzon fb 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 ar x0w(7hskt6rx e

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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 h +t2r(a3zgmcsb3-7p/toe 8vji hh:cguitar string and the sound wave generated by the guitar as a result of this vibration. What do these two waves have in sjrc8he+b-vczim:po/ 3 t(g 273 a hhtcommon?

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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 botn-2yk)w,0 du goyy3yfodi 4v8h 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 wavelengths of the thr,ez b: hzfn4i+a1 hyw/ee lowest tones produced by tn /hz +he1yi,:4zb fawhis 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 resonateww8e e2uye 40v in an open pipe of length L is 200 Hz. Which one of the following frequenci8 yve42eu0wwe es 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 resonatingpqmp z-d)z 20h 1bvqt9 at its fundamental frequency. Which statement is corrzpthq)p0 1bz-m92 qdvect?

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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 wh sax xhlp-i3-7mu62o6blx 9e nich 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 lenb y3 * z)3fvuojxh-ah4);b rpvgth L. What are the wavelengths of the three lowest tones produced by th zyova;))hr 3 pxb3hjfvb4-* uis 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 yna; yyyp7;ql u +fp8;closed pipe of length L is 200 Hz. Which of the following frequencies wily+p ;yu8;n;pf7q yyall 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 resonatsw7ghbhs rifu8 o4 uj 7172r.wing at its fundamental frequency. Which staf8 j774sb2.wishohr1 w uugr7tement 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 driven by the same source. Er 7.iqhu,.z (xr7h tzsv9db)v5wec, a ach speaker produc rh.tbe,wrhz)vv d7.q zai ( u5s7x,9ces a tone with a frequency 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 should0(rzozyv 8v4ec0j( *hj r jzq6 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 tn /k m2(3pazgshtm) p9ogether and a particular beat frequency is heard. What happens to the bea( a2 mpk3hmgt/9n)zsp t 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 explains)cuu0mwe:m1zhx+ 3 re

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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 stat/ ,hw72z fis waw; jfvo.qc1;gionary observer. The frequency heard by the observof7wj;hf wz . ;1w cvqas,/g2ier 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 ste+h20: gzhs ga7pt .85ytkgshationary observer. The frequency heard by the observer is +8gy h z57etgh.a2:sh pktg0s

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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,jt .j7c yxs1l3i4 63 cfufw3bj its half-angle will decrease by a factor of:13ibs4cwu33 7cj fxjly 6tjf.

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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 ib1h1qnow.y :in air is 352 m/s. What is th1:w b1ynq o.ihe 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 t8kgfy8m- di s:9 7vdpdhe 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 i2k ols0trk )3n-zij2sn air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away n oksl)032-z rkji 2stwas 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. mny5pt o-6m c)ne z.z- 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 lightning, the distance to theq:j sq fcc zp0zum 8 3l2y:/3ogns:dg5sl38scgj :cqum d oz5p2 /:03qgzyf:n lightning 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 h chr,j(/e6puday 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 hei4 htjq-ti 1lfa)h 57war the splash 2.5 s later. How deep is the well? (Ignore air resistance, and assume the velocity of soun i ihq-4 wtl5jtf71)ahd 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 st5 a5q ,7qnh)xa2zfd:k7 hkgvound 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 an hi8+r,9btn)uf0hjp t $23 \; ^{\circ}C$ 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 dhqwg-,ps +j 14 ioib3c a5o-qwith 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 s 1ml dm+cu;;n 6dgt2whound?

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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 inte(bux;5 3fki8/+ f7 ef ulvsohwnsities of two sounds with intensity levels of 70 dB ab;3xwfu u /7e +5vfsiho8 (lfknd 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 10 nq9/vhw+panrj4s z68 0 dB. What is the intensity level generate anqn6rv/ sh+ 49wzjp8d 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 equallyo fv/g5rsb y84 in all directions ify 5r4 8bsovg/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 6.0 m from a source that is radiatin)4 kw/cp8nzci-cvscn8nwgn /m ;5l6yg equally in all directc85v /8w)cgmn sn kly-wn ;cni46/zpc ions 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 w 8 yfy87nk jb7alysg68b 2qa;assumed to be uniformly distributed in all directions. Wha 67j88yqg7by;wslakb82y n f at 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 dmf x h*:f it :8y9y8 *nqdxvfe(mm:9fjistance 5.00 m from a barking dog. What would be the intensity level if two identical dogs very close to eac mdifx yf9 9x*8f:8yn:(vhq e*mtmj:fh 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 isapcm(gh h/ 9rjdf5rw(4 7xo)l 60 dB. What is the intensity level (in dB) at a point 2.0 m from the source? Assume that the source radiates equally in alld7gp m/c woah)4rfj9xl5(( rh 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 5unt dgi3s/6n30h8;svukc .4dj c ;+xwoxw-il.0 m from a point source is 95 dB. At what distance will it be 75 d6hd .l;cx j/uvi n-s3uwxto3n+d;0si4wck8 gB?

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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 t2gr;rsfn1x . o3-i gwvhe frequenc fnrrs -;w.23o xvi1ggy 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 harmontgs/) nv8szmc . j8qk(ic of an open pipe is 900 Hz. What is the lengtj( ssvkqmnt zc.)88g/h 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 ee q*6 z7tu uv,kz)+tran open pipe of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an+et v)7r6 eqt, uzuzk* 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 b eh+btol8a ,lg4) fp9has a length of 0.80 m. If the velocity of sound in air is 340 m/s, what is the frequency of th4h blot9 +8 agp,befl)e 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 2 0racsd47 hjh0bnzwg3slk vou94-k g hg/b21room 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 on5zc kv c8/ctw-: 4izaxe end is 330 Hz. What is the frequency of the thirv8zx iw5tckc/4 ac- z:d 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 will have a fundax9x 4cwj17bo i,q rj:5/ghpr lmenx9 4r lhpqo7,cw jbr x/gi1j:5tal frequency of 60 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 the temperature i6rlkb,c( g8 tqi 1(oxq7s ,ydq z-l)lcs $20 \; ^{\circ}C$. 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 7u/s q*blj7t xin a room where 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 playe;nb1p-w2x( mcm lgqxkj(7xy 1d when the speed of sound in air isj;cq(lx k (mpy2 x7 wx-g1b1mn 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: +/ynr86icy+ jh ,hfq0wg3algone 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 + y3 + ln68igwcgfqjr,/h0ahythe 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 velocit c0hmnxhz)(,2lc r,rt9 /zu 4hv,eqwhy of sound is 340 m/s. How much fam qvh,xc eln4ur)thzz9r/,c, hh20 (wrther 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 by the same fre:bs-u.n04 qcd -dphmzquency of 500 Hz. If the distance from a person to one speaker is 5.00 m and the person detects little ocnzm d- :hp0ub.- dsq4r no sound, which 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 frequenciesy-mujs c7+,wm of 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-yluy*tmw1z)*qx:v f;-e lq, uHz tuning fork to tune the frequency of a musical instrument. If the tuner hears a beat frequency of 2 Hz, w:q-l1fumx q, eyu *)yltv*wz;hat 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 be+0f+fku c mvca9d: r9y two horns are 6 m and 7 m respectively. What c rk:+ce9d9ff m uv0a+beat frequency is heard 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 onh8mu +pg(t rs3ce4 vs- two violins in an orchestra are found to produce a beat frequency of 2 Hz when a frequency of 660 Hz is played. What percentages+rp 84h 3vtcs- (umge 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 atf))a,vqx9 kgf .9a jn(w n,qdk twice the speed of sound. The obsew,k,f a .xf9kqnd(qvag))n j9rver 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 of 1000 Hz) approaches a statinrtj6c /xkb/82o 4:7alep i ovonary observer at one-half the /kxlo 2cp8jr6in/7b eoav t4: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 frequenc ppp k5q u1-ivs4* nlvl7n8b(kk0 i6smy of 1000 Hz. If a listener moves with a speed of 30 m/s away from the source, wha4vli(k p isb8*1 -us6mvnplk75pqn 0kt 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 800-Hz siren. It is traveling dyir2lfth//l*.v(1j mj3y zvat 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 change of freq*j yh v1d(2t j/mz/l.y f3ilvruency 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 station2oomgom 4meop (r*.6n ary observer when a train approaches with a speed of 30 m/s. The frequ 4mm(remn o2.op g6oo*ency 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 120 km/h. The train blows its 400-Hz 3vm:25k v7 e.kgpmdap.j5yvb whistle.dpy:g752m.b kpvj a. vk5v3me Take the speed 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 tre5eh .k.c37/ble c 1q dsd(aeb1zron/ain. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do youq / c/ z1.1k3ae.ebdcos hedel57rb(n 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/ktxq:l 67tgl away from you at 120 km/h. The train blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. What frequency do ygtqtx6 l7/: klou 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 whih+b814ytyof ;+th hknstle, and you hear a tone of 400 Hz. Take the speed of sound to be 340 m/s. What is the actu+ky t;o4hbn+t h1f8yhal 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 Hk v fv; b7+yk0kxu:1vrz. Assume the speed of sound in air is 340 m/s. What is the frequency heard by an observer if the observer is moving away from the train w:kfk;ryvb10v7 kv x+ uith 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 7 j1 s,puxbb8 p)azx)cis 500 Hz. Assume the speed of sound in air is 340) jb781,u)bs pxa zpxc m/s. What is the frequency 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 spa ,d*rs gs7 ygf--gp4da uhn49eed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Assume the speed of sound is 345 m/s. How fast is thdsn-g,ag9*44rs agu ph7 fd-ye 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+fvc osl 5 (skf+-utg8 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 1f94 marn7b:um0)+wpew - nv wl.4. What is the half-angle of the conical shock wave formedraewf b-mn9vpnu0 + m74lw) :w?

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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 Statesq bz1wg hv( :bsny k5gv+io-0lgf776x to Europe with a Mach number of 1.05 where the air temp7lbni6kg fz51+hgw (bvq voxyg: 0s-7 erature is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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