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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: 游客未登录  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 false statem-eold1 a21dkwent?

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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 cx2jbi ;n7l. tjec-p.vonducted 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 q; gw/w6n,0w;wtntmo 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 velocitydse9o5nm915ka wmxx ; of sound? (Assume that all s;1 o5exx dnma 59wkm9other 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 4 ( taes*dx*f kr45jng/guk*pjt0 52uh0rl*xi00 Hz sound, the velocity of a 200 Hz sound through air iarx5*jt*ggistudr j(h 0 u4 x e*0*k/fnk25pl s

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Compared to the wavelengthpp*q0 wya5 g6e2zg- elx6h0mb of a 400 Hz sound, the wavelength of a 200 Hz sound in air isp- z5y6x w0amp6q2be0gg*le h

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Sound vibrations witpbamd:y0 ag+f 0jh0o: h 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 opxk5n79v w:gcalled

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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 uniform8) /gq8;- v at aopeq7t5nqbeply in all directions. If you move to a point twice as far away from the 7tpbt5 / -8 q)a;evoqe8nqgapsource, 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 is proportio4eg wvudzcla ;: i;,ek1t03)uufkb *onal 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 dis 5j;rt- +khp4t 1/cha22+md sd iaryvdtance d from the source is I. What is the intensity at a dpthd-2a yrj5s ;rvd+1c2m /ait4 d+hkistance 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 sourc t)h*6icb6-isj 2f,zwllnlf1e that is radiating equally in all directions. What happens to the intensity of s cfiz*ilw6tlbn )f1,h 6 lj-2the 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 i v ,vnhdgj;j kx1g,w80s radiating equally in all directions. What happens to the intensity level of t0;8hvdwgj ,vj1 gx k,nhe 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 increasek3a -i7q2fq c7 homz3ws 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 emitting a pure tone. W(h./le9ssxz4* 7fvx-1s rg uykw yhm6hat characteristic of the soundsy*/gw6m.eh s9rxs1hz(f7u- l yk4 xv 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 m3 33doxmftddqn c;)l:sl( mw4usical 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 as8; 0/dhh , p 2qtvo/n kwpmz1wr .+o-jon2zvv 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 fro h8e jz;:xzaa:wjde-7m air into water

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pressure and displacemen1 ; bzzkd, yuh3+w w,xnqsvhpo9 q528at 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.v5hok)c/1 f;iwqk v1xuy ga/ring and the sound wave generated by the guitar as a result of thishw5/gyx. )ck oa 1 qfu1/ivkv; 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 elv8/ fos,px1x4t.xl0m+aqbwhich is 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. Whar * c35ebm6caafu+m)ut are the wavelengths of the three lowest tones produced bybr eua+a* fmc6 )m5c3u 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 88y ebbb- y,glg4 8skn200 Hz. Which one of the following frequencies will not resonate in y,bn-e l8sg 8yb48gb kthe 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 frequenfy4s/jj ; c9gjcy. Which statement is js;cj9/ 4yfj gcorrect?

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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 end and closed at the other, thyz+0rfo+ (j pgere

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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 wavelengtbx3 y1l565sfhup adt;:i9 w kxhs of the three lowest txu:d wxp1slf i;by6 95 5hkt3aones 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 clos+asy6)* *th qrnfv1s ved pipe of length L is 200 Hz. Which of the following frequenvs1htq*s vyrf+a6)n* cies 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 cft9obd5o9h * ylosed at one end is resonating at its fundamental frequency. Which statementod hb 9foy5*9t 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 betwezdh-. az y3 uktg+v8/yen two speakers driven by the same source. Each speaker produces a tone with a frequency of 200 Hz on a day when the spd+ukzt/.8ahy y z3v-geed 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, huhb99i lc;coo)+ x9rthe 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 frequency is*otp4h7.nd 7zv dkrm 8 heard. What happens to the beat frequency if the frequeh8k.ovd7r p*7td4 n mzncy 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 exp k/p;:jw8q s cs9yr8hplains

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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 observe1( .s gb2wan5i,bbyrd r. The frequency heard by the obsdgws5a , b(nib1ryb2 .erver 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 stationary observer. The frequency heard by the oo:(:b qd3 iyeubserver iue :3iyobq(d: s

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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-sbpcwt9-c*c9 skza.4 fpeed, its half-angle will decrease by a factb9a49* f.-tczpkw csc or 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 air is 352 m/s. Wj0fs8z*i 7y6 p*a y0m6mmowz:p5g q b9cnl/io hat is the air temcm*m o6 p p:g5*sqaw i8yijy/6l7z zn0bf09m operature?

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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 of4da+3zp5xcv d the 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 i82 ylzuss8:uon air is 340 m/s, a bat emits a shriek whose echo reaches it 0.0250 s later. How far away wasl8zso2uu :s 8y 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.-82vyxe.ja s u00 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 lightning, the distance t-d( 7du j-ce+vh xhte:o the lightning strike+- de xj(de7thc:h uv- 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 temperatut i.jf eu*;k87 cpfv :ojdqz-2re 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 dej r3l xe9u3ajf 5mwjug69j7g:ep well and hear the splash 2.5 s later. How deep is the well?jr:muu3 7g xja9f9egwj5 36jl (Ignore air resistance, and assume the 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 ofrpoi catmtiqh): 4w:n (ze8/*5c dv0e 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 ob(.xzufd1b 4* tev ;o$23 \; ^{\circ}C$ 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 with intensib(t)zxng zg)9 ty $10^{-3} \; W/m^{2}$?

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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 soundcfby(c + j5fx/?

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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 in +5kf;p. 9*;nnjll nbumge* envu/; fwtensity levels of 70 dB and 40 n.e *muv +9 kn;*ujl l/bpn5gfef;n;w 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 f+ab om,+ce5q100 dB. What is the intensity level generate mq+ce ,bo+f5ad 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 disto:y uvg-pe:xn h:;mdi5 +on u,ance of 6.0 m from a source that is radiating equally in all directions is:+u:,npoo :vy- hen 5 diugx;m
$6.0 \times 10^{-10} \; W/m^{2}$. 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,bfy2cg 8z ar2c+nkz0 is radiating equally in all directio ab+8 r0f kz2cczy,2gnns 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 tob7 w 9hee;tr.l be uniformly distributed in all directions. What is the intenb9 ;wte.7rlhe sity 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. .oa.4mq8n 2b4hp3 gtw;4 xdke3u nierWhat would be the intensity level if two identicalnrht84peoq x n3;b.42 .wmgek4d3a ui 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. Whaaf7 fh zjj7r5)t is the intensity level (in dB) at a point 2.0 m from the 5 rj)77afjzhf 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 point source is 95 dB. At what diboal iz++xz 7mpnz 5f;e-,5 ;vvjthp )stance will it bv hfz )5j,-7 a ; e+zbvpxtp5l+nmoiz;e 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 of6 swt( ,i(4eakm/kwbi a complex tone has a frequency of 1200 Hz. What is the frequency of the fourth sm(e tk/i a b46ki(,wwharmonic?

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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 hw3/h q0jyyrb;armonic of an open pipe is 900 Hz. What is the length of h3 q yb/;w0yjrthe 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 pipea q(hbn)0+fe+huu h ,*jiua8 h of length L is 400 Hz. What is the frequency of the lowest tone that will resonate in an open pipe of length 2 a)uj+q,eu ibhhu0(fn a +*h8hL?

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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 veloc)s1gy;d g.yklz bnh 15ity of sound y. 1hy)znlbskgd g51; in 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 fyiu /hoyr ,f+ + 73ykqc::dwta 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 one end is 330 Hz. Wo8k2ldh5*n /pe n *fashat is the frequency of the third haf5h*apo *l n 82kne/dsrmonic?

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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 clo 8n wh6/gbv)mhsed on one end that will have a fundamental frequency of 60 Hz on a day when the velocity of6ghnh) v/wbm8 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 rbtgzjtfo+ 02a )exf- :oom 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 thuqu 5 ,4.tkdbye 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 //07 nt.p dqldbghnl:in air is 340 m/s. What is the fundam/dh:t0.7/lnpnq dgbl ental 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 i6xah3un i(vismap 79q6i,ki5 3lr-ua s closed on one end. If the fundamental frequency of the opi ihi q -s u,a7m6 5luvin3(p6kx9ara3en 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 eachhuo;q42ql(t n9 veoj/ emit a frequency of 800 Hz in air where the velocity of sound is lnj; (2qveuqto9o/h 4 340 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 side and dx4 /h*dak5vme tc+ke/riven 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 followa/ex h4 vdkk/te5+c*m ing 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 frequencies of 44/knygj54 o8et +s nm59vp-da0+tt ldd0 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 -hf1qyu5r m1dto tune the frequency of a musical instrument. If the y-rd1hu5 fq1 mtuner 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 1n 4bwr7 4 ig4daes-nuj z*o4eproduced by two horns are 6 m and 7 m respectively. What beat frequency i 1*o44jdnaz-use7wi 4 nb4ergs 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 s,t1acz t06w kkonz;igbo.8blo)-1 w strings on two violins in 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 tentco kan 1g-10wobzt.z6 ,oi k)sw; b8lsion 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 10i/k s,iceux+*uj5e,7n c 1 gveq7bt k-00-Hz sound source at twice the speed of sound. The observer hears a freekt,- n7 u5i/jqievk17 scx ,e g+uc*bquency 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 frequencyhul;b lz44;m g of 1000 Hz) approaches a stationary observer at one-half the speed of sound. The observer zg;bl4 hm4lu; 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 lu)pczwkrk0ns8 ndsl2f23:f( istener moves with a speed of 30 m/s away from the source, what is the frequency (2fc0nnp8lkzf)wsd k :3u2 srheard 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 at 35 m/s on a 3po 5:lxy 1clsday when the speed of sound through air is 340 m/s. The car approaches and passes an oxy5l1l :scp3observer 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 byr181.obk- 0d mhu+ wm1,momxupelmz* a stationary observer when a train approaches with a speed of 30 m/s. The frequency of the train horn is 0xw muo-+pbr o1*d1mm8lhm1,u. zkem 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+z0 kogu5x p1od9(wo (oa wp8cn blows its 400-Hz whistle. Take the speed of sound to be 340 m/s. u9wx+dzag8 (o(pkw 5 0oo1c po 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 u yys,3of2 bmkeh /6s:stationary train. The train blows its 400-Hz whistle. Take s b :/efs6k,u3 h2ymoythe 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 away from you at 120 km/h. The train m6up*,ht 0wfvjj)p- )y sp:ltblows its 400-Hz whistle. Take the s)sj* puptfy6m:t- jw0plh , )vpeed 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. It blows its whistle, and tjq/cl87wre0abt85a1x(v ,qmysbb . you hea b7,b(mav8ttbq 8qx/aer1w5. j yc0 lsr a tone of 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 50sp+ fa5g eyf nv, v9youyb3o/m91,1mg ba2pg90 Hz. Assume the speed of sound in air is 340 m/s. What is the frequency hearaobp 9oy gvf39yy1/m v5,+b,sp29ne1 gufmagd 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 awakt-u tg7 q0+7 npm0sound in air is 340 m/s. What is the frequency hea707a+w unq-pm agt0k trd 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 determinp2t(f .)v kpi24 5khlng5kavbe the speed of an object. A 40-kHz signal is sent out, and a 42-kHz signal is returned. Asspg4) k5kb l5( vpnfia.t2h 2kvume 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 shock wave produced by ar ,+odxgrmnf q,n tj1daq5c-;ren63; 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 half-a13ucjwo5o ev es1nv2+ngle of the conical shock wave fore1u2o+cj 5w1sevv3nomed?

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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 with a Macnvjro25i hh)91x)2*zcr + xcfupixk7 9.jke mh number of 1.05 where the air temperatu k2jh1*7.mz2+rokfci9niexx hucv9 )r5x) p jre is $5.0 \; ^{\circ}C$. What is the speed of the plane?

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