题库网 (tiku.one)

 找回密码
 立即注册

 

      

上传图片附件

未使用图片

小贴士: 允许的图片文件格式为: gif, jpg, jpeg, png, webp,上传完成后会在上方生成预览,用鼠标连续双击缩略图,或拖动缩略图,该图片就被绑定至本题,显示在题目下方

本次作答已使用

小贴士: 此栏目显示的是当前作答使用的所有图片,绑定到某一题目的图片同时会显示在该题目下方; 删除使用的图片会将其转移到<未使用图片>类别


习题练习:Vibrations and Waves



 作者: 王信东Wood发布日期: 2024-12-27 14:41   总分: 111分  得分: _____________

答题人: 匿名未登录  开始时间: 12月27日 14:41  切换到: 整卷模式

标记此题
1#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Give some examples of everyday vibrating objects. Which exhibit SHw -hyl/lfw,p:nr95 l*ezyc . dM, at least approximately-9z5/.ny*prcf lh dwe:w ,lly ?
参考答案:    

标记此题
2#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Is the acceleration of a simple harmonim5c-1la (gez igyg 77nc oscillator ever zero? If so, where?
参考答案:    

标记此题
3#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Explain why the motion of a piston in an asj-f5ruy2 xa6 6s0txfutomobile engine is approximately simple harmoniur s0 5t-6jsfx6f 2xyac.
参考答案:    

标记此题
4#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Real springs have mass. Will the true period and fjgrwqe,1*mh c mm3;y-requency be larger or smaller than given by the equations for ,mrwj1yc-e;hmq 3m* ga mass oscillating on the end of an idealized massless spring? Explain.
参考答案:    

标记此题
5#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
How could you double the maximum speed of a pl2a29qr mm2kx; 8 3r4scdc57 lwwa3upj r5rusimple harmonic oscillator (SHO)?
参考答案:    

标记此题
6#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A 5.0-kg trout is attachw/n0; : ug/fo2kuurdwnc t61eed to the hook of a vertical spring scale, and then is released.:utw n21fkowu0 c//n ; reudg6 Describe the scale reading as a function of time.
参考答案:    

标记此题
7#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
If a pendulum clock is accurate at s9p j+dl8g(ue 2wx1yedea level, will it gain or lose time when takenewg d yj219du8(l+pex to high altitude? Why?
参考答案:    

标记此题
8#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A tire swing hanging from f1oip/:y xy+9(h rk f c(tqp3ha branch reaches nearly to the ground (Fig. 11–48). How could you estimate theqy yp :fc kr3fx(pt/io+19h(h height of the branch using only a stopwatch?
参考答案:    

标记此题
9#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Why can you make water slosh back and fmx;ul wg n4-7oorth in a pan only if you shake the pan at a certain freq xgw7u-m;n4ol uency?
参考答案:    

标记此题
10#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Give several everyday examples of refye-(6uz84cl s 8m+bdlo6 a grsonance.
参考答案:    

标记此题
11#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Is a rattle in a car e7 wf+ ddxjwgu/g6y/. wver a resonance phenomenon? Explain.
参考答案:    

标记此题
12#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Is the frequency of a simple periodic wave equal to the frequency of its shrmtg+5 g1w-g ource? Why or why now5m 1+gg-hrt gt?
参考答案:    

标记此题
13#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Explain the difference between the speed of a transverse 3k6vlkque*zu )dj 08ywave traveling down a cord and the speed of a tiny pie)ldk 3uqzkv6uj0*8y ece of the cord.
参考答案:    

标记此题
14#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Why do the strings used for the lowest-frequency j9xv6d9yi4;euz o r5i notes on a piano normally have wire wrapped arov5 96;xy u9zjiie4rod und them?
参考答案:    

标记此题
15#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
What kind of waves do you think wilexj py.m,u / -pj;yy:pl travel down a horizontal metal rod if you strike its enp. x;jypy ,puy /-m:ejd (a) vertically from above and (b) horizontally parallel to its length?
参考答案:    

标记此题
16#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Since the density of b vdl pl q*ic9xh8i-/8air decreases with an increase in temperature, but the bulk modulus B is nearly independent of temperat9/i*8xicl-hbvq 8 lpdure, how would you expect the speed of sound waves in air to vary with temperature?
参考答案:    

标记此题
17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Give two reasons why circular water waves dd plg/t1 4j)po s3jkt)ecrease in amplitude as they travel away from thgdlp4) pt)/3o j1tjks e source.
参考答案:    

标记此题
18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Two linear waves have the samer pe 3 qbqrc,52 25f3zjtghwh) amplitude and speed, and otherwise are identical, except one has half the wavelength of the other. Which transmitz 23,ec25r5jqb)hf3qwt pr g hs more energy? By what factor?
参考答案:    

标记此题
19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
When a sinusoidal wave ( tq sv0z/sbgd2e0/fdcrosses the boundary between two sections of cord as in Fig. 11–33, thefs t(s 0 ded/qz20/gvb frequency does not change (although the wavelength and velocity do change). Explain why.
参考答案:    

标记此题
20#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
If a string is vibrating in three sce5eq1 6 qxs(gxn 8mf+egments, are there any places you could touch it with a knife blade wgf1s68x c enxqqm(e+ 5ithout disturbing the motion?
参考答案:    

标记此题
21#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
When a standing wave exists on a string, the vibrations of inci+y e iz+mja-(krv e86kdent and reflected waves cancel at the nodes. Does this mean that enmz6k+- erajk ievy( +8ergy was destroyed? Explain.
参考答案:    

标记此题
22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
If we knew that energy was bc*kg /qlro+b 7g*: wdwse3oi- eing transmitted from one place to another, how might we determine whethcw kqgo-+/gisow7bdlre:* *3er the energy was being carried by particles (material bodies) or by waves?
参考答案:    

标记此题
23#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a particle undergoes SHM with amplitude 0.18 m, what is the total distro hh5se+sl8+/tp u 6vj z7d,wance it travels in on7z v,5edhuh8 lsp+ 6rsj+ ot/we period?    m

参考答案:     查看本题详细解析

标记此题
24#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An elastic cord is 65 cm 8lup3 p vk-q,geu*5adlong when a weight of 75 N hangs from it but is 85 cm long when a weight of 180 N hangs from it. What is the “spri8e,d p g3vup5*luqa-k ng” constant k of this elastic cord?    N/m

参考答案:     查看本题详细解析

标记此题
25#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The springs of a 1500-kg car compress 5.0 mm when il1zug)h la)p 0qbs.zdl nrw)e b)9/x0ts 68-kg driver gets into the driver’s seat. If the car goes over a bump, what wina) w.)d )sllrl19 pugb /0bhx0ezqz)ll be the frequency of vibrations?$\approx$    Hz

参考答案:     查看本题详细解析

标记此题
26#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A fisherman’s scale stretches 3.6 cm when a 2.7-kg fish hangs f b-c zod7na3f/rom it. (a) What isd nczf /-3a7ob the spring stiffness constant $\approx$    N/m
(b) what will be the amplitude and frequency of vibration if the fish is pulled down 2.5 cm more and released so that it vibrates up and down? $\approx$    Hz (round to one decimal place)

参考答案:     查看本题详细解析

标记此题
27#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An elastic cord vibrates with a fg0 z2axk+-k2vjh ysh8 requency of 3.0 Hz when a mass of 0.60 kg is hung from it. What i0v yxgh jzksh a8+2-2ks its frequency if only 0.38 kg hangs from it?    Hz

参考答案:     查看本题详细解析

标记此题
28#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Construct a Table indicating the position x of the mass in Fig.-vbqz,)mb-lvgs1 d j 99asa c7 11–2 at times t = 0acbs)919dvvl -bq sz agmj,- 7,t = $\frac{1}{4}T$,$\frac{1}{2}T$,$\frac{3}{4}T$,T and $\frac{5}{4}T$,where T is the period of oscillation. On a graph of x vs. t, plot these six points. Now connect these points with a smooth curve. Based on these simple considerations, does your curve resemble that of a cosine or sine wave (Fig. 11–8a or 11–9)?

参考答案:    

标记此题
29#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A small fly of mass 0.25 g is caught in a s58n q5 )znp mmmccugh-x71t5w pider’s web. The web vibrates predomin85cz xg 1cmnm h7qu 55t)mw-npately with a frequency of 4.0 Hz.
(a) What is the value of the effective spring stiffness constant k for the web?$\approx$    N/m (round to two decimal place)
(b) At what frequency would you expect the web to vibrate if an insect of mass 0.50 g were trapped?    Hz

参考答案:     查看本题详细解析

标记此题
30#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A mass m at the end of a spring v 99mpd3 *+x q vj6q7nqp,hqcrkibrates with a frequency of 0.88 Hz. When an additional 680-g mass is added to m, thkqr9qnjm6ph9,v cdq7* x3+ pqe frequency is 0.60 Hz. What is the value of m?    kg

参考答案:     查看本题详细解析

标记此题
31#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.60-kg mass at the end of a spring vibrae6;qf;b.rzp g tes 3.0 times per second with an amplitude of 0.. f6eg;bqr;pz 13 m. Determine
(a) the velocity when it passes the equilibrium point,$\approx$    m/s(round to one decimal place)
(b) the velocity when it is 0.10 m from equilibrium, $\approx$ ±    m/s(round to one decimal place)
(c) the total energy of the system,$\approx$    J(round to one decimal place)
(d) the equation describing the motion of the mass, assuming that x was a maximum at x = (0.13π)cos(  πt)

参考答案:     查看本题详细解析

标记此题
32#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what displacement 2)soyy9.6qz)* wuo(e fiy ;igf3 x+twcw;tk cfrom equilibrium is the speed of a SHO half the maximum valuet( w wzo.*fsf;k2 yei)+q o6ixc)g y3wtcyu;9 ?$\approx$    A

参考答案:     查看本题详细解析

标记此题
33#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A mass attached to the end of a spring is sc5l/v *5xje jq-6zzqze*/tn g;ew9 pdtretched a distance $x_0$ from equilibrium and released. At what distance from equilibrium will it have acceleration equal to half its maximum acceleration?
参考答案:    

标记此题
34#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A mass of 2.62 kg stretches a vertical spring 0.315 m. If g 8z a ng:v,2rqx9qw+hthe spring is stretched an additional 0.130 m and released, how long does it take to reach the (new) equilibrium positin rzw qv982h ,g:xa+qgon again?    s

参考答案:     查看本题详细解析

标记此题
35#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object with mass 3.0 kg is attached to a springsa)2)qmz zb*aw+ttu) with spring stiffness constant k = 280 N/m and is executing simple harmonic motion. When the obj+zsm) qbzt *)twa)2auect is 0.020 m from its equilibrium position, it is moving with a speed of 0.55 m/s
(a) Calculate the amplitude of the motion.    m
(b) Calculate the maximum velocity attained by the object.$\approx$    m/s (round to two decimal place)[Hint: Use conservation of energy.]

参考答案:     查看本题详细解析

标记此题
36#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  It takes a force of 80.0 N to compress the spring of a toy popgun 0.y hp a.a7c4x gsd( 7w xd5scpdr324u;j200 m to “load” a 0. ry.pd7(jw5cp3g daa c 7h2sxx;4dsu4180-kg ball. With what speed will the ball leave the gun?    m/s

参考答案:     查看本题详细解析

标记此题
37#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A mass sitting on a horizontal, frictionless surface is attached to one end ofmor8/idu6 f/m9m7zjwh 7pqb/2bv4 a v a spring; the other end is fixed to a wall. 3.0 J of work is required to compress the spring by 0.12 m. If the mass is releasedjvmzd vmpq 7h/br/68 bau29mfwoi 4/7 from rest with the spring compressed, the mass experiences a maximum acceleration of 15 $m/s^2$ Find the value of
(a) the spring stiffness constant    N/m
(b) the mass.$\approx$    kg

参考答案:     查看本题详细解析

标记此题
38#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 0.60-kg mass vibrates according to the equation x = 0.48: .ctc4z dsjo5cos6.4t where x is in meters and t is in seconds. Detes4 jtdc. cz8o:rmine
(a) the amplitude,    m
(b) the frequency, $\approx$    J(round to two decimal place)
(c) the total energy, $\approx$    J(round to one decimal place)
(d) the kinetic energy and potential energies when $\approx$    J(round to one decimal place)

参考答案:     查看本题详细解析

标记此题
39#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At what displacement from equilibrium is the energy of a SH81 ck4 totd6yp 4tg+yqdmys12O half KE and half PE4o1 1 c2yymtst8 6 4dqgtykpd+? ±    A

参考答案:     查看本题详细解析

标记此题
40#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If one vibration has 7.0 times the energy of a secondrr.3.rz k(iv7* ij4r pyv9srm , but their frequencies and masses are the same, what is the ratio7svkjpr. ry3r4mi v .r*9zi r( of their amplitudes?   

参考答案:     查看本题详细解析

标记此题
41#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.00-kg pumpkin oscillates0h3woge ;qz h 8lcd:5l from a vertically hanging light spring once every 0.65 s. lwq:8z goeh;50l h c3d
(a) Write down the equation giving the pumpkin’s position y (+ upward) as a function of time t, assuming it started by being compressed 18 cm from the equilibrium position (where ), and released. y = (   m)cos($\frac{2\pi t}{0.65s}$)
(b) How long will it take to get to the equilibrium position for the first time?    s
(c) What will be the pumpkin’s maximum speed?    m/s
(d) What will be its maximum acceleration, and where will that first be attained?   $m/s^2 $

参考答案:     查看本题详细解析

标记此题
42#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A block of mass m is suppojdy42p1b (xn.z na9wbrted by two identical parallel vertical springs, each with spring stiffness constant k (Fig. 11–49). What will be the f1x4dbn n (yb2z 9ajpw.requency of vibration?
参考答案:    

标记此题
43#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 300-g mass vibrates according to the equation x = 0.38sin6.5t wh (tvbpp wus6em)(:r a2ere x is in meters and t is in seconds. Determin )r6u2ev(pbsw :( tpmae
(a) the amplitude,    m
(b) the frequency,    Hz
(c) the period,    s
(d) the total energy, $\approx$    J
(e) the KE and PE when x is 9.0 cm.$E_{potential}$ =    J $E_{kinetic}$ =    J($E_{kinetic}$round to two decimal place)
(f) Draw a careful graph of x vs. t showing the correct amplitude and period.

参考答案:     查看本题详细解析

标记此题
44#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Figure 11–50 shows two examt w2wis927 4uqoaq qc9ples of SHM, labeled A and B. For each, what is
(a) the amplitude,$A_A$ =    m $A_B$ =    m
(b) the frequency, $f_A$ =    Hz $f_B$ =    Hz
(c) the period? $T_A$ =    s $T_B$ =    s
(d) Write the equations for both A and B in the form of a sine or cosine.$x_A$ = (    m) sin($\frac{\pi}{2}t$) $x_B$ = (    m)cos ($\pi$t)


参考答案:     查看本题详细解析

标记此题
45#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At a 755-g mass at rest on the end of a horizontc5, hvlfyd6tph1ssnc:5sx+ 6n:/y gpal spring (k = 124 N/m) is struck by a hammer, which gives thx6c:, sfsn:+ dpv/ 5c15hpy sy6nglthe mass an initial speed of 2.96m/s Determine
(a) the period and frequency of the motion,    s    Hz
(b) the amplitude,    m
(c) the maximum acceleration,    $m/s^2$
(d) the position as a function of time, x = (    m)sin(4.08$\pi$t)
(e) the total energy.    J

参考答案:     查看本题详细解析

标记此题
46#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A vertical spring with spring stiffness constant 305 N/m vibrates with an amplc7z5rj8ig.o -usv ;rvitude of 28.0 cm when 0.260 kg hangs from it. The mass p-rgurc5iovzvs. 87 ;j asses through the equilibrium point (x=0) with positive velocity at
(a) What equation describes this motion as a function of time?
(b) At what times will the spring have its maximum and minimum extensions?
参考答案:    

标记此题
47#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A mass m is connected to two springs, wil/05.yt ok7 g)ixuurqth spring stiffness constants $k_1$ and $k_2$ as shown in Fig. 11–51. Ignore friction. Show that the period is given by
T=2 $\pi \sqrt{\frac{m}{k_{1}+k_{2}}}$ .

参考答案:    

标记此题
48#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 25.0-g bullet strikes a 0.600-kg block attached to a bejd. o9wt lf5wm(; cx4:0wesfixed horizontal spring whose spring 5 0.dcle :4bj(9x;m owtwesfw stiffness constant is $ 7.7\times10^{3 }$ N/m The block is set into vibration with an amplitude of 21.5 cm. What was the speed of the bullet before impact if the bullet and block move together after impact?    m/s

参考答案:     查看本题详细解析

标记此题
49#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bungee jumper with mass 65.0 kg jumps from a high bridge. After reaching his(5 .2k(p*e ej-gr;e6kj dstwuql 4ikn lowest point, he oscillates up and down, hitting a low point eight more times in 38.0 s. He finally comes to rest 25.0 m below the level of the bridge. 26k 5je*(ukr-g si ntjl( ;ep .dw4kqeCalculate the spring stiffness constant and the unstretched length of the bungee cord.
spring stiffness constant$\approx$    N/m(Round to the nearest integer)
unstretched length of the bungee cord    m

参考答案:     查看本题详细解析

标记此题
50#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pendulum makes 36 vibrations in exactly 60 s. What i2 gr4+y7vgkzkzh9(m bs its
(a) period,    s/cycle
(b) frequency?   Hz

参考答案:     查看本题详细解析

标记此题
51#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  How long must a simplej g. du)tpti33 pendulum be if it is to make exactly one swing per second? (That is, one complete vi)tu3 tp3 d.jigbration takes exactly 2.0 s.)    m

参考答案:     查看本题详细解析

标记此题
52#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A pendulum has a period of 0.80 s on Earth. What is its period on Mars, where th,2r9d2b iwfb8n qco r4x(5ubme acceleration of gravity is about 0.37 that on E br(rn5d obc w,i4qf 2bmx982uarth?    s

参考答案:     查看本题详细解析

标记此题
53#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the period of a si95/tfpk vs 2rtmple pendulum 80 cm long
(a) on the Earth,    s
(b) when it is in a freely falling elevator?

参考答案:     查看本题详细解析

标记此题
54#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The length of a simple pendulum is 0.760 m, the pendulum bob has a mass tkx7( a 2wer/dof 365 grams, anatwe2k x/ d(7rd it is released at an angle of 12.0 $^{\circ} $ to the vertical.
(a) With what frequency does it vibrate? Assume SHM. $\approx$    Hz(round to three decimal place)
(b) What is the pendulum bob’s speed when it passes through the lowest point of the swing?    m/s
(c) What is the total energy stored in this oscillation, assuming no losses?    J

参考答案:     查看本题详细解析

标记此题
55#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Your grandfather clock’s pendulum has a length of 0.9930 m. If the clotg3m xnvt1 f3;ck loses htg;33tvnm1 xf alf a minute per day, how should you adjust the length of the pendulum? shortened by    mm.

参考答案:     查看本题详细解析

标记此题
56#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Derive a formula for tif7qro 2q*zk u6l-. lbhe maximum speed $v_{max}$ of a simple pendulum bob in terms of g, the length L, and the angle of swing $\theta_{0}$
参考答案:    

标记此题
57#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A clock pendulum oscillates at a frequency of 2.5 Hz. At it is l1ht.:v(,8l /obiuml7hw ywz released from rest starting at 1 ll7 lwthm,/.w b(:8huvzyioan angle of 15 $^{\circ} $ to the vertical. Ignoring friction, what will be the position (angle) of the pendulum at
(a) t = 0.25 s ,    $^{\circ} $
(b) t = 1.60 s ,    $^{\circ} $
(c) t = 500 s ?    $^{\circ} $
[Hint: Do not confuse the angle of swing $\theta$ of the pendulum with the angle that appears as the argument of the cosine.]

参考答案:     查看本题详细解析

标记此题
58#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A fisherman notices that wave crests pass the bow of his anc6t5hrbjqo6a *t , 6hega-i. enhored boat every 3.0 s. He measures the distance betweenra t6e*ib5ejoqh,6 6-ht a. gn two crests to be 6.5 m. How fast are the waves traveling?    m/s

参考答案:     查看本题详细解析

标记此题
59#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound wave in air has a frequency of 262 281t.c77g uxi/ehtxjuvye )l Hz and travels with a speed of 343 m/s How far apart xu/8h.2l ugy evtx1)7cij et7 are the wave crests (compressions)?    m

参考答案:     查看本题详细解析

标记此题
60#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  (a) AM radio signals haveevibv-wu- l:/q +-zxm frequencies between 550 kHz and 1600 kHz (kilohertz) and /-vq:-zimlwv e b+ux -travel with a speed of $ 3\times10^{8 }$ m/s What are the wavelengths of these signals?    m to    m(b) On FM, the frequencies range from 88.0 MHz to 108 MHz (megahertz) and travel at the same speed; what are their wavelengths?   m to    m

参考答案:     查看本题详细解析

标记此题
61#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the speed of longitq v-mpe *8jlaegv53f) d7nwcgdvz/ ;l ((klg/udinal waves in
(a) water,    m/s
(b) granite,    m/s
(c) steel.    m/s

参考答案:     查看本题详细解析

标记此题
62#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two solid rods have the same elastic moduxgp*m5*si1lh, *k+edptoel/ )ou: n llus, but one is twice as dense as the other. In which rod will the speed of longitudinal waves be greater, ,/**e enpsx*l)lm iuo+ lp:5dgkht 1o and by what factor?   

参考答案:     查看本题详细解析

标记此题
63#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cord of mass 0.65 kg is stretched between two supports 28 m aiw)3r 7myag t7part. If the tension in the cord is 150 N, how long will it take a pulse to travel from one support tga mr7w37y)tio the other?    s

参考答案:     查看本题详细解析

标记此题
64#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ski gondola is connected to the toqe3om 0t1*r rvp of a hill by a steel cable of length 620 m and diameter 1.5 cm. As the gondola comes to the end of its run, it bumps into the terminal and sends a wave pulse along the cable. It is observed that it took 16 s for the pulse to retur*tr q0 ovm1er3n.
(a) What is the speed of the pulse? (Round to the nearest integer)$\approx$    m/s
(b) What is the tension in the cable?    N

参考答案:     查看本题详细解析

标记此题
65#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sailor strikes the side of his ship just below the sua 2 5wo.s2ebqprface of the sea. He hears the echo of the wave reflected from the oq.b25ow2 p esacean floor directly below 3.0 s later. How deep is the ocean at this point?    m

参考答案:     查看本题详细解析

标记此题
66#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  P and S waves from an earthquake kt92 xdopc8 0ztravel at different speeds, and this difference helps in locating the earthquake 2ztdco8 k09xp“epicenter” (where the disturbance took place).
(a) Assuming typical speeds of 8.5km/s and 5.5km/s for P and S waves, respectively, how far away did the earthquake occur if a particular seismic station detects the arrival of these two types of waves 2.0 min apart?    km
(b) Is one seismic station sufficient to determine the position of the epicenter? Explain.

参考答案:     查看本题详细解析

标记此题
67#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An earthquake-produced surface wave can be approximated by a sinusoidal transa1k/4uax0j yeverse wave. Assuming a frequency of 0.50 Hz (typical of earthquakes, which actually include a mixture of frequencies), what amplitude is needed so that objects begin to leave contact with the groundxk uay4j /a0e1? [Hint: Set the acceleration a>g]    m

参考答案:     查看本题详细解析

标记此题
68#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What is the ratio of (a) thelo kb,j4 nx2v, intensities, and (b) the amplitudes, of an earthquake n,jkb4lvo ,x2 P wave passing through the Earth and detected at two points 10 km and 20 km from the source?(a)    (b)   

参考答案:     查看本题详细解析

标记此题
69#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The intensity of an earthquake wave passing through the Earth is measured tou+y2k9iznh) y9rq m6ri+ a)a f be ur9iiq n ++mkyz a26yfa)9hr) $ 2\times10^{6 }J/m^2$ at a distance of 48 km from the source.
(a) What was its intensity when it passed a point only 1.0 km from the source?(round to one decimal place)$\approx$    $ \times10^{9 }W/m^2$
(b) At what rate did energy pass through an area of $5m^2$ at 1.0 km?    $ \times10^{10 }W$

参考答案:     查看本题详细解析

标记此题
70#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two earthquake waves of the same frequency travel through ))l3yfp8q svt the same portion of the Earth, but one is carrying twice the energy. What is the ratio of the amplitudes p38)yvq) sftlof the two waves?   

参考答案:     查看本题详细解析

标记此题
71#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two waves traveling along a st+.pszs8nw3u: 8zle3 ey2mgwuretched string have the same frequency, but one transports three times the power of the other. What is the ratio2 8w+:zl s. zeuepn8w3uy3gms of the amplitudes of the two waves?   

参考答案:     查看本题详细解析

标记此题
72#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bug on the surface o8q3lz)p4xn . xnumk+cb t;)ph f a pond is observed to move up and down a total vertical distance of 6.0 cm, from the lowest to the highest point, as a wave passes. Ipl ) pt 4qnhc8u mn.x;k3)xz+bf the ripples decrease to 4.5 cm, by what factor does the bug’s maximum KE change?   

参考答案:     查看本题详细解析

标记此题
73#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
The two pulses shown +t(tz( n-vwgy1,tgcx in Fig. 11–52 are moving toward each other. (a) Sketch the shape of the string at the moment they directly overlap.tgwtnt+ 1-y((,vz cx g (b) Sketch the shape of the string a few moments later. (c) In Fig. 11–36a, at the moment the pulses pass each other, the string is straight. What has happened to the energy at this moment?

参考答案:    

标记此题
74#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a violin string vibrates at 440 Hz as its fundamental frequency, what ar2ngd.t5l*s h je the frequenl*. dgt52sjhncies of the first four harmonics?$f_1$ =    Hz $f_2$=    Hz $f_3 $ =    Hz $f_4 $=    Hz

参考答案:     查看本题详细解析

标记此题
75#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A violin string vibrates at 294 Hz when unfingered. At what frequency will it vi 3ba8ent7k.io brate if it is fingered one-third ieta3 87 kbon.of the way down from the end? (That is, only two-thirds of the string vibrates as a standing wave.)    Hz

参考答案:     查看本题详细解析

标记此题
76#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A particular string resol/291ez9fy bs ad lurwrng2* 7m0n8ufnates in four loops at a frequency of 280 Hz. Name at least three other frequensl2a dn28ez9u f b9rf urymln0/gw *17cies at which it will resonate. $f_1$ =    Hz $f_2$ =    Hz $f_3 $ =    Hz $f_5 $ =    Hz

参考答案:     查看本题详细解析

标记此题
77#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The velocity of waves on a string is 92m/s If the frequen,z2vuntg+nx/0p 9xi v cy of standing waves is 475 Hz, how ig/v9zv2,nxnuxt p+0 far apart are two adjacent nodes?   m

参考答案:     查看本题详细解析

标记此题
78#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If two successive overtones of a vibrating string are 280 Hz and 350g ac:lg 6u *:dqx0zae5/)(nrnnxuj4z Hz, what is* r05nazde(zqx:uag/6u :lnn4 xg )c j the frequency of the fundamental?    Hz

参考答案:     查看本题详细解析

标记此题
79#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A guitar string is 90 cm long and has a mr. yihg77k)ss-f s:beass of 3.6 g. The distance from the bridge to the support post is L = 62cm and tgs-.bf77 sish:rky e )he string is under a tension of 520 N. What are the frequencies of the fundamental and first two overtones?    Hz

参考答案:     查看本题详细解析

标记此题
80#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A particular guitar string is supcu4nkcf e0:t5b2u bg:qlw ;zoc-j( g 8posed to vibrate at 200 Hz, but it is measured to vibrate at 205 Hz. By what percent should t;kw05gu ubcn4fl :tcj qc8:e gb (2oz-he tension in the string be changed to correct the frequency?So the three frequencies are,    Hz    Hz    Hz to 2 significant figures.

参考答案:     查看本题详细解析

标记此题
81#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A particular guitar string is supposed to kuge 9lmv,- 18vg6lv-:k hsncvibrate at 200 Hz, but it is measured to vibrate at 205 Hz. By what percent should the tension in the string be changv lvgelvc h,n:skuk9-m g-168ed to correct the frequency? decreased by    %

参考答案:     查看本题详细解析

标记此题
82#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  One end of a horizon lbjg8+m:nq j;l.rc3m qjo9 .qtal string is attached to a small-amplitude mechanical 60-Hz vibratorg ;mn+jj 8qj.c:l.lq3rm b9oq . The string’s mass per unit length is $3.9 \times10^{ -4}$ kg/m The string passes over a pulley, a distance L = 1.50 m away, and weights are hung from this end, Fig. 11–53. What mass m must be hung from this end of the string to produce
(a) one loop,(round to one decimal place) $\approx$    kg
(b) two loops,    kg
(c) five loops of a standing wave? Assume the string at the vibrator is a node, which is nearly true.   kg



参考答案:     查看本题详细解析

标记此题
83#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Problem 59, the length of the string may be adjusted by movin(o1pm+ (haf beg the pulley. If the hanging mass m is fixed at 0.080 kg, how many different standing wave patterns may be achieved by vahpbao mf +((1erying L between 10 cm and 1.5 m?   

参考答案:     查看本题详细解析

标记此题
84#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When you slosh the water back and forth in a tub at just the right frequency, th2t j- 8;db 3pdxxoya55w o)lgse water alternately rises and falls at each end, remaining relatively calm at the center. Suppose the frequency to produce such a standing wave in a 65-cm-wide tub is;y) asbp3 x5dt-o2o5x8lj dgw 0.85 Hz. What is the speed of the water wave?    m/s

参考答案:     查看本题详细解析

标记此题
85#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An earthquake P wave traveling at k.0 km/s strikes a boundaryugwl4ly 5(n8g within the Earth between two kinds of material. If it approaches the bounlggn5y4(8l u wdary at an incident angle of 47 $^{\circ} $ and the angle of refraction is 35 $^{\circ} $, what is the speed in the second medium?    km/s

参考答案:     查看本题详细解析

标记此题
86#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Water waves approach an underwater “shelf” where the velocity changes fromwtq7-oteo9j) 4 pj,r q 2.8 m/s to 2.1 m/s If the incident wave crt,q)w7pjo9 t eqoj-r4ests make a 34$^{\circ} $ angle with the shelf, what will be the angle of refraction?    $^{\circ} $

参考答案:     查看本题详细解析

标记此题
87#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sound wave is traveling in warmg 3:1l7iru/+ mjzxf se air when it hits a layer of cold, dense air. If t+:u jsf3ix gz1em/l r7he sound wave hits the cold air interface at an angle of 25$^{\circ} $, what is the angle of refraction? Assume that the cold air temperature is $ - 10 ^{\circ} C$. and the warm air temperature is $ + 10 ^{\circ} C$. The speed of sound as a function of temperature can be approximated by v=(331+0.60T) m/s where T is in $ -10 ^{\circ} C$.    $^{\circ} $

参考答案:     查看本题详细解析

标记此题
88#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A longitudinal earthquake wave strikes a boundary between tw h21z8yzan.ll;w wc5be/ upj) 3eyjm0o types of rock at a 38 y a0z;p3un/e w.5m2w jhb18cyl)ljze $^{\circ} $ angle. As the wave crosses the boundary, the specific gravity of the rock changes from 3.6 to 2.8. Assuming that the elastic modulus is the same for both types of rock, determine the angle of refraction.    $^{\circ} $

参考答案:     查看本题详细解析

标记此题
89#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A satellite dish is about o*)9gcl h/k -roun e4x0.5 m in diameter. According to the user’s manual, the dish has to be pointed in the direction of the satellite, but an error of e)n r4h*g/kulxo9-coabout 2 $^{\circ} $ is allowed without loss of reception. Estimate the wavelength of the electromagnetic waves received by the dish.    m

参考答案:     查看本题详细解析

标记此题
90#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A tsunami of wavelength 250 km and velocity5usj v4fz,t )e 750 km/h travels across the Pacific Ocean. As it approaches Hawaii, people observe an unusual decrease of sea level in the harbors. Approximately how much time do they have to run to safety? (In the absence of knowledge and warning, people have died during tsunamis, some of them attracted to the shore to see stra 5tjfv,uz4 se)nded fishes and boats.)    min

参考答案:     查看本题详细解析

标记此题
91#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An energy-absorbing car bumper has a spring stiffness constant of 550 kN -ed; 38fy ( ra o1-hghtnt4u2pia )8xrsugl4j/m Find the maximum compression of the bumper if the car, with mass 1500 kg, collides with a wall at a speed of 2.2 mo ui4h8s; a- r yut(3l e4xgp-a18 th)2nfrjgd/s (approximately 5 mi/h). [Hint: Use conservation of energy.]    m

参考答案:     查看本题详细解析

标记此题
92#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 65-kg person jumps from a window to a fire net 18 m below, which strajp(4*;pfwj1:u*qbe- vas0gaxk ;uo/ j s.f retches the net aqea/o:b; kfrvx*0g w s;a(1j *f4 psp-uju.j1.1 m. Assume that the net behaves like a simple spring, and
(a) calculate how much it would stretch if the same person were lying in it.    m
(b) How much would it stretch if the person jumped from 35 m?    m

参考答案:     查看本题详细解析

标记此题
93#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A mass m is gently placed on the end of a freely ix:*glce7 hz7hanging spring. The mass then falls 33 cm bezxhe 7l gi7*c:fore it stops and begins to rise. What is the frequency of the oscillation?    Hz

参考答案:     查看本题详细解析

标记此题
94#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 950-kg car strikes a huge spring at a speed of 22 m/s (Fig. 11–54), cm3mm x:w)l +2d: -a o*b moyv;f3avcbuompressing the spring 5.0 m. (a) What is tl2 b*m o;bv:afod :)vm3 -xwyum3 a+mche spring stiffness constant of the spring?    N/m (b) How long is the car in contact with the spring before it bounces off in the opposite direction?    s


参考答案:     查看本题详细解析

标记此题
95#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When you walk with a cup of coffee (diameter 8 cm) at just the right pace ofuk(2yy,sts9n ru -1i wv4fp 0m about 1 step per second, the coffee sloshes more and more until eventually it starts to spill over the topr94 u tu01sfpv(yw yi2n,s-mk (Fig. 11–55). Estimate the speed of waves in the coffee.    cm/s

参考答案:     查看本题详细解析

标记此题
96#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The ripples in a certain groove ht93.zd*edny8mrijgx 9x+7 g10.8 cm from the center of a 33-rpm phonograph reco d+x.gn ixr8dte*3mjhg99 zy7 rd have a wavelength of 1.70 mm. What will be the frequency of the sound emitted?    Hz

参考答案:     查看本题详细解析

标记此题
97#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 2.00-kg mass vibrates according nz/ . n(obg6zrto the equation x=0.650cos7.40t where x is in meters and t in rb n/6.z(o nzgseconds. Determine
(a) the amplitude,    m
(b) the frequency,(round to two decimal place)$\approx$    Hz
(c) the total energy,(round to one decimal place)$\approx$    J
(d) the kinetic energy and potential energy when x=0.260 m.(round to one decimal place) PE$\approx$    J KE =    J

参考答案:     查看本题详细解析

标记此题
98#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A simple pendulum oscillat;da7 g6we49hl1rp b 2wmnzm(ses with frequency f. What is its frequency if it accelerates at 0.50g (am1wlzndsw 9 6rg(p7 2b4;mh ae) upward,    f
(b) downward?    f

参考答案:     查看本题详细解析

标记此题
99#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 220-kg wooden raft floats on a lake. When a 75-kg man stands on the raft, wlqtiue.z26/ it sinks 4.0 cm deeper into the water. When he steps u.qe26lzw/ t ioff, the raft vibrates for a while.
(a) What is the frequency of vibration?(round to one decimal place) $\approx$    Hz
(b) What is the total energy of vibration (ignoring damping)?(Round to the nearest intege) $\approx$    J

参考答案:     查看本题详细解析

标记此题
100#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two strings on a musical instrument are tuned to pz mv e 19n9vjus6b4s2hlay at 392 Hz (G) and 440 Hz (A).nmhv96j9 2eu 41v bzss
(a) What are the frequencies of the first two overtones for each string? G : $f_2$=    Hz $f_3$=    Hz A : $f_2$=    Hz $f_3$=    Hz
(b) If the two strings have the same length and are under the same tension, what is the ratio of their masses ($m_{\mathrm{G}}/m_{\mathrm{A}}$)   
(c) If the strings instead have the same mass per unit length and are under the same tension, what is the ratio of their lengths($L_{\mathrm{G}}/L_{\mathrm{A}}$)   
(d) If their masses and lengths are the same, what must be the ratio of the tensions in the two strings?   

参考答案:     查看本题详细解析

标记此题
101#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Consider a sine wave trave j)l6)icavcexm ruz i)0,ua21ling down the stretched two-part cord of Fig. 11–33. Determine a formula (a) for th0) )ju6cc mxu2ezala ,)irvi1e ratio of the speeds of the wave in the heavy section versus that in the lighter section, and (b) for the ratio of the wavelengths in the two sections. (The frequency is the same in both sections. Why?) (c) Is the wavelength greater in the heavier section of cord or the lighter?

参考答案:    

标记此题
102#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A tuning fork vibrates at a frequency of 264 Hz, c/afhxmu /c0:(z4k n fand the tip of each prong moves 1.8 mm to either side of center(0 :u/ax hzffmcnck/ 4. Calculate
(a) the maximum speed    m/s
(b) the maximum acceleration of the tip of a prong.    $m/s^2$

参考答案:     查看本题详细解析

标记此题
103#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A diving board oscillates with simple harmonic motion of frequency gcn zsbw9m lh 3), wsq37cjli41sd.j21.5 cycles per second. What is the maximum amplitude with which the end of the board can vibrate in order that a pebb3w 4snc,c2sjm319 )sbhdj igw7l lqz. le placed there (Fig. 11–56) will not lose contact with the board during the oscillation?
参考答案:    

标记此题
104#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A string can have a “free” end if that end is ag(6xvh y c lhh/2tdh2;ttached to a ring that can slide without friction on a vertical pole (Fig. 11–/lxy2 th;(2 hvd6ghch57). Determine the wavelengths of the resonant vibrations of such a string with one end fixed and the other free.

参考答案:    

标记此题
105#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A “seconds” pendulum has a period)yk-devj2rwe6ii,)e of exactly 2.000 s — each one-way swing takes 1.06ee,k2jie- ir)dw v) y00 s.
(a) What is the length of a seconds pendulum in Austin, Texas, where $g=9.793\mathrm{m/s}^{2}$    m
(b) If the pendulum is moved to Paris, where $g=9.809\mathrm{m/s}^{2}$ by how many millimeters must we lengthen the pendulum?    mm
(c) What would be the length of a seconds pendulum on the Moon, where $g=1.62\mathrm{m/s}^{2}$    m

参考答案:     查看本题详细解析

标记此题
106#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A mass hanging from a spring can oscillate in the vertic ,v rlpll .*4a6/qzkfosi7r-tal direction or can swing as a pendulum of sm6 - rl 7oi kpalfr/,lz.q*4svtall amplitude, but not both at the same time. Which one is longer, the period of the vertical oscillations or the period of the horizontal swings, and by what amount? [Hint: Let $l_0$ be the length of the unstretched spring, and L be its length with the mass attached at rest.]
参考答案:    

标记此题
107#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A block with mass $M=5.0\mathrm{kg}$ rests on a frictionless table and is attached by a horizontal spring $\begin{pmatrix}k=130\mathrm{N/m}\end{pmatrix}$ to a wall. A second block, of mass $m=1.25\mathrm{kg}$ rests on top of M. The coefficient of static friction between the two blocks is 0.30. What is the maximum possible amplitude of oscillation such that m will not slip off M?    m

参考答案:     查看本题详细解析

标记此题
108#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 10.0-m-long wire of mass 123 g is stretched under a tens.wovs(l 3 4rt4cnms l.wln8 6qion of 255 N. A pulse is generated at one end, and 20.0 ms later a second pulse is generated at the opposite end. Where will the rsw .4l3(snc8 46qm. tovllwn two pulses first meet?    m

参考答案:     查看本题详细解析

标记此题
109#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A block of mass M is suspendedr+c.3mwn0t qu from a ceiling by a spring with spring stiffness constanq +trucm0w.3 nt k. A penny of mass m is placed on top of the block. What is the maximum amplitude of oscillations that will allow the penny to just stay on top of the block? (Assume $m \ll M$)
参考答案:    

标记此题
110#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A crane has hoisted i6csyd;jnj 6 gi, 2l/ea 1200-kg car at the junkyard. The steel crane cable is 22 m long and has a diameter of 6.4 mm. A breeze starts the cai ;n/,lse i62cdj6gjyr bouncing at the end of the cable. What is the period of the bouncing? [Hint: Refer to Table 9–1.]    s

参考答案:     查看本题详细解析

标记此题
111#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A block of jello rests on a plate as shown in j/5el3pjw1fjq2fja c +f) su0Fig. 11–58 (which also gives the dimensions of the block). You push it sideways as shown, and then you let go. The jello springs back and begins to vibrate. In analogy to a mass vibratingfl sp w 0fu/cf3jqe5j)j1 a+2j on a spring, estimate the frequency of this vibration, given that the shear modulus (Section 9–5) of jello is 520 $N/m^2$ and its density is 1300 $kg/m^3$    Hz



参考答案:     查看本题详细解析

  • :
  • 总分:111分 及格:66.6分 时间:不限时
    未答题: 已答题:0 答错题:
    当前第 题,此次习题练习共有 111 道题
    本系统支持习题练习,作业与考试三大模式,作业考试自动评分,成绩排序一键导出,可设定动态变量同一试卷千人千题
    如果您对本系统感兴趣,想加入我们或者想进行任何形式的合作,请加微信 skysky1258

    浏览记录|使用帮助|手机版|切到手机版|题库网 (https://tiku.one)

    GMT+8, 2025-1-18 16:06 , Processed in 0.282885 second(s), 243 queries , Redis On.