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习题练习:gc textbook chapter 2 Kinematics in One Dimension



 作者: admin   总分: 107分  得分: _____________

答题人: 匿名未登录  开始时间: 04月29日 13:28  切换到: 整卷模式

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1#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Does a car speedometer meak(3dp)d: bwm:x7 m91z-vmvc e0ybpqasure speed, velocity, or both?
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2#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Can an object have a varying speed if its velocity is)mf6nwb( i d6o constant? If yes, give exampdm (6w6 obni)fles.
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3#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
When an object moves with constant velocity, does its ar*stoyq7y0 l i86x v07mhe b1xverage velocity during any time interval differ from its instantaneous veloci718yxb 6xv *r oiqst ym007hlety at any instant?
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4#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
In drag racing, is it possible for the car with uo349zstw6kfp 57kzt the greatest speed crossing the finish line to lose thet67 to f4wup9sk 5k3zz race? Explain.
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5#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
If one object has a great mwi,zlp6 3y7zer speed than a second object, does the first necessarily have a greater acceleratioli6pzzw,73 myn? Explain, using examples.
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6#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Compare the acceleration of a motorcycle that accelerates from 80km*mcusberm w*: / 3hmk- +vm-:xegtrum: s,n8i/h to 90km/h with the acceleration of a bi3c-ms*u+-uhxm: m:mtr b: 8eewm/,r *sg kvincycle that accelerates from rest to 10km/h in the same time.
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7#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Can an object have a northward velocity and a southward acceleratioz* u;v h :wlesnj67sd-n? Explain.
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8#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Can the velocity of an obnovk s 7hjt0+-q3 fz;mmh lg00ij bd5*ject be negative when its acceleration is positive? What abjod ;lh0n0t05s 3vqf g+hi7kbjm-m *z out vice versa?
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9#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Give an example where both the veloci5fidz)- f3w u;mtq *sjqf2,od ty and acceleration are negative.
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10#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Two cars emerge side by side from a tunnel. Car A is traveling wiimo m+g c fxm-2+4.w* fy)mjzpth a speed of 60km/h and has an acceleration of 40km/h/min . Car B has a speed of 40 km/h and has an acceleration of 60km/h/min . Which car is pa i zmm+mo. +-4m*wf2)xcgfp jyssing the other as they come out of the tunnel? Explain your reasoning.
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11#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Can an object be increasing i*a7li 6+r9u e1k4v;vq rcu n3hpsk9f ln speed as its acceleration decreases? If so, give an79 4i9;l6v nh1uqf*vc rk sre3pakl+u example. If not, explain.
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12#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A baseball player hits a foul ball straight up into tvfqmvnduvbfx(1/ k ;n;49 g -jhe air. It leaves the bat with a speed of 120km/h . In the absence of air resisg9-u nnffkv d(;vq4xv;b m/ 1jtance, how fast will the ball be traveling when the catcher catches it?
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13#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
As a freely falling object speeds up, what iss7i)u.9vjet740:xm 7wg8em pl vxy sd happening to its acceleration due to gravity — does it incrm:wj )9xvg4eld7 v7yt 0xpem78i uss .ease, decrease, or stay the same?
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14#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
How would you estimate the maximum height youv4n6qyby+q09 ce* ;t5nla5k jfyl /qc could throw a ball vertically upward? How would you estimate the mayn +/bq9ntc*v40c a5 eqyjfq6ll5k y;ximum speed you could give it?
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15#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
You travel from point A to point B in a car moving at a c2xkt3 184ujy f+y inmdonstant speed of Then you travel the same distance from point B to another point C, moving at a constant speed of yf1 m8uy2 4n3txdjki+90km/h . Is your average speed for the entire trip from A to C 80km/h ? Explain why or why not.
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16#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
In a lecture demonstration, a 3.0-m-long vertical striqjsh62kyuxp;(a,6 zx ng with ten bolts tied to it at equal intervals is dropped from the ceiling of the lecture hall. The string falls on a tin plate, and the class hears the clink of each bol2yup6xz; (h,xa6j s kqt as it hits the plate. The sounds will not occur at equal time intervals. Why? Will the time between clinks increase or decrease near the end of the fall? How could the bolts be tied so that the clinks occur at equal intervals?
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17#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Which one of these mo ah*l id 28mah5her6h+tions is not at constant acceleration: a rock falling from a clid* ahhr a lm2i+8h6e5hff, an elevator moving from the second floor to the fifth floor making stops along the way, a dish resting on a table?
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18#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
An object that is thrown vertically vfaf65)wlj 9o; ek, krupward will return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, will this result be altered, and if so, how? [Hint: The acceleratio r9fa;6w )vkoklef5j ,n due to air resistance is always in a direction opposite to the motion.]
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19#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Can an object have zero velocity and nonzero7ow6mant8q iay/ 8noa4 * z4kt acceleration at the same time? Give 6ywn7 zi*8 anqa4t4toaok8/mexamples.
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20#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Can an object have zero acceleration and nonzero velocity at the same time? Gztt-byf-xabo a-3 +jsa 7z)a+v1jy3 aive examples.yo1-tyz+fbat zsajaxv7 3 )-a-+aj3b
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21#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Describe in words the motion plotted in Fig. 2–28 in terms of v, a, etc. [Hi tq y, ryl4lavf0r+m-6nt: First trr6yv,-m 0t+4a lqy lrfy to duplicate the motion plotted by walking or moving your hand.]
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22#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Describe in words the motion of the object grapy., -w9d/owu maeo u5ndukl;5hed in Fig. 2–29.
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23#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What must be your car’s average speed in order to travel 235 km in 3.25rlbkj da**9gsh 5b62e h?    km/h

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24#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bird can fly 25 km/h How long doehe sf9x6y-ek)g-1 xars it take to fly 15 km?    h

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25#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you are driving along a straf wpui( /v2f3p(toi1iight road and you look to the side for 2.0 s, how far do ( o fvtii(p2i f1uw/p3you travel during this inattentive period?    m

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26#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Convert 35 mi/h to h,9; 4 eu5qj;ljims *dvs(,fupy+tiw
(a) km/h,    km/h
(b) m/s ,    m/s
(c) ft/s.    ft/s

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27#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A rolling ball moves from 8d7 qv zbztau2s/)a/56 avjza $x_1$ = 3.4 cm to $x_2$ = -4.2 cm during the time from $t_1$ = 3.0 s to $t_2$ = 6.1 s What is its average velocity?    cm/s

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28#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A particle at $t_1$ = -2.0 s is at $x_1$ = 3.4 cm and at $t_2$ = -4.5 s is at $x_2$ = 8.5 cm What is its average velocity? Can you calculate its average speed from these data?    cm/s

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29#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are driving home fro-jq*co8 n rmv82ibc y(m school steadily at 95 km/h for 130 km. It then begins to rain and you slow to 65 km/h You arrive home after driving 3 hourcnj*-b8i cyv( qmr28 os and 20 minutes.
(a) How far is your hometown from school?    km
(b) What was your average speed?    km/h

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30#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  According to a rule-of-thumb, every five seconds between a lightning fl. o:x yfefz0pf5; 1gbqash and the following thunder gives the distance to the flash in miles. Assuming that the flash of light arrives in essentially no time at all, estimate the speed of sound in m/s from th ebzgf;.p05:xq1 o yffis rule.    m/s

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31#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person jogs eight complete laps around ao db ti8j.;+tr quarter-mile track in a total time of 12.5;oj.b+t8 ditr min. Calculate
(a) the average speed    m/s
(b) the average velocity, in    m/s

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32#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A horse canters away from its trainer in a straight line, movs2 yb97fn9kio pw(g;iing 116 m away in 14.0 s. It then turns abruptly and gallops halfway back iisyp9kg; 7f w9n(o2bin 4.8 s. Calculate
(a) its average speed    m/s
(b) its average velocity for the entire trip, using “away from the trainer” as the positive direction.    m/s

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33#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two locomotives approach each other on parallel tracks. Eackv0bqw*bxi/3- z/d :u8. 0wjvznqyrth has a speed of 95 km/h with respect to the ground. If they are initially 8.5 km apart, how long will it be befo/.qi:du tkbzv08/ *3r0wj-yq z nbwxvre they reach each other? (See Fig. 2–30).    min


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34#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car traveling 88 km/h is 110 m behind a truck traveling How long will it t ( ing83vbe,n(tybse6ake the car to reach the tru(ys3in, e(ebbnt 8g6vck?    s

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35#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane travels 3100 km ato.h/;ojz -q(wup/dk s a speed of 790 km/h , and then encounters a tailwind that boostsw/sp kd.;o/jz qh u-o( its speed to 990 km/h for the next 2800 km.
What was the total time for the trip?    h
What was the average speed of the plane for this trip? [Hint: Think carefully before using Eq. 2–11d.]    km/h

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36#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Calculate the average speed)dy5,wm h4.gtsb3nl wlig 50g and average velocity of a complete round-trip in which the outgoing 250 km is covered at 95 km/h followed by a 1.0-hour lunch break, and t .,d)0wgl5s hwybg4 35ilmtn ghe return 250 km is covered at 55 km/h.    km/h

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37#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bowling ball traveling with constant e( n.q ,zn.ouq)odu *dspeed hits the pins at the end of a bowling lane 16.5 m long. The bowler hears the sound of the ball hitting the pins 2.50 s after the ball is released from his hands. nuo. oqzqu,* d)edn(.What is the speed of the ball? The speed of sound is 340 m/s.    m/s

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38#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sports car accelerates from rest to 95 km/h in 6.2 s. What is its avevq/ey/pj;6j/sc s tq p 8oate*9e3 3perage accee/jv et/sstyj6833; eoqpc/ a*p q 9peleration in $m/s^2$ ?    $m/s^2$

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39#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sprinter accelerates from rest to 10.0 m/s zjtf3 0 +-ay t5oy.35az rztgbin 1.35 s. What is her acceleration rb 0g+ta.3fo3taz5 zjyy5 zt -
(a) in $m/s^2$ ,    $m/s^2$
(b) in $km/h^2$ ?    $km/h^2$

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40#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  At highway speeds, a particular axgx26q(.9zhnp+n xj)b6 xo vautomobile is capable of an acceleration of about 9gxxxpxhq )jnv 2na6z6b.( +o$1.6 m/s^2$ At this rate, how long does it take to accelerate from 80 km/h to 110 km/h ? $\approx$    s (Round to the nearest integer)

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41#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A sports car moving at constant speed travels 110m ca3ez8tg+8)hw vw5 ;xowt- g m in 5.0 s. If it then brakes and comes to a stop in 4 m3ogc)wzx-g85we;t t+8hva w .0 s, what is its acceleration in $m/s^2$ ? Express the answer in terms of “g’s,” where 1.00 g = 9.80 $m/s^2$ .    $m/s^2$    g's

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42#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
The position of a raci*dpcimg a0p* 8yr y9g+ng car, which starts from rest at t = 0 and moves in a straight line, is given as a function of time in the following Table. Estimate (a) its velocity and (b) its acceley*89 *grgp+0 mydacp iration as a function of time. Display each in a Table and on a graph.
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43#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car accelerates from 13 m/s to 25 m/s in 6.0 snsvpd ds,33m xst2 cd.cn5 t59. What was its acceleration? How far did it travel in this time? Assume constant accetn v 53s.tx,dd2s 5mnc9p3 cdsleration.    $m/s^2$    m

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44#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car slows down from 23 m/s to rest in a di8uz0ldcm shg:, 9kzt 8stance of 85 m. What was its acceleration, assumedd 90h u :gt8,sczk8mzl constant?    $m/s^2$

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45#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A light plane must reach a speed of 33 m/s for tat:+ 8orsk1uk mn0(u mqc:c2bu y 2lt.kkeoff. How long a runway is needed if the (u tm:ck uo2cqnl0:umstb r28(+1.kykconstant) acceleration is $3.0 m/s^2$ ?    m

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46#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A world-class sprinter can burst out of the blocks to essentially top speed (of 3oy g66ys nd8gwkn0e6about6 oygw8yed6gsn 36 kn0 11.5 m/s) in the first 15.0 m of the race. What is the average acceleration of this sprinter, and how long does it take her to reach that speed? $\approx$ =    $m/s^2$ (retain two decimal places)    s

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47#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car slows down uniformly from a speed 2elh-z0ku6/ qwxq ,/er7eegyof 12.0 m/s to rest in 6.00 s. How far did it t/e,w2g-q re 0e7zek/6 uxy lqhravel in that time?    m

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48#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In coming to a stop, a car leaves skid marks 92 m long on p7 ;s twwgsn:7the highway. Assuming a decelerat;wg7s7n p sw:tion of $7.00 m/s^2$ estimate the speed of the car just before braking.    m/s

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49#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car traveling 85 km/h strikes a tree. The front end of the car compress+igp6+y l ,nmve ;sp0res and the driver comes to rest afte0;+pls+vr,eyn6 igmpr traveling 0.80 m. What was the average acceleration of the driver during the collisi on? Express the answer in terms of “g’s,” where 1.00 g = 9.8 $m/s^2$ . =    $m/s^2$ (retain two decimal places )    g’s

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50#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Determine the stopping distances for a car with an initial*vei1g h js6zh wv.faqi sgx;o- -p411 speed of 95 km/h and human reacta1sgsg h o4 * i ;jxqf--1zp6ivw1eh.vion time of 1.0 s, for an acceleration
(a) a = -4.0 $m/s^2$ ;    m
(b) a = -8.0 $m/s^2$    m

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51#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Show that the equation for the stosh/eoxs-imu -,gkjf v)7;lf f 1j2 :zopping distance of a car is $d_S\,=\,v_0t_R\,-\,{v_0}^2/(2a)$ , where $ v_0$ is the initial speed of the car, $ t_R $ is the driver’s reaction time, and a is the constant acceleration (and is negative).
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52#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A car is behind a truck going 25 m/s on the highway. The car’s driver l r:c;fu ,w67genw 3phwooks for an opportunity to pass, gue;hwwp 7f,n3u ce:grw6 ssing that his car can accelerate at 1.0 $m/s^2$ He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at 25 m/s He estimates that the car is about 400 m away. Should he attempt the pass? Give details.
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53#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A runner hopes to complete the 10or9lexn c)bh6;r:8.w,, mg 2 cyn ihub,000-m run in less than 30.0 min. After exactly 27.0 min86rx n i l9ne;,y,wcc.ubmh)o: bhgr2, there are still 1100 m to go. The runner must then accelerate at 0.20 $m/s^2$ for how many seconds in order to achieve the desired time?
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54#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A person driving her car 63otur.jyh-l at 45 km/h approaches an intersection just as the traffic light turns yellow. She knows that the yellow light lasts only 2.0 s before turning red, and she is 28 m away from the near side of the intersection (Fig. 2–31). Should she try to stop, or s. 3r 6hl-jtuoyhould she speed up to cross the intersection before the light turns red? The intersection is 15 m wide. Her car’s maximum deceleration is $-5.8 m/s^2$ , whereas it can accelerate from 45 km/h to 65 km/h in 6.0 s. Ignore the length of her car and her reaction time.
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55#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A stone is dropped from the top of a cliff. It hits the ground below afte4 .fjyv,6bskvi7vm +pr 3.25 s. How high is j7m6ivpy,4 svf.+kbv the cliff?    m

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56#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If a car rolls gently ;n4 cyd8 9sura 9u6ygp($v_0\,=\,0$) off a vertical cliff, how long does it take it to reach 85 km/h ?    s

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57#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Estimate
(a) how long it took King Kong to fall straight down from the top of the Empire State Building (380 m high), $\approx$ =    s (retain one decimal places)
(b) his velocity just before “landing”?    m/s

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58#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A baseball is hit nearly straight(j/.q 4mhp0h c q7oxzo8em.cd up into the air with a speed of 22 m/s
(a) How high does it go?    m
(b) How long is it in the air?    s

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59#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ballplayer catches8t.l,tq.h 7rg0kn3c zcaft )i a ball 3.0 s after throwing it vertically upward. With what speed did he thtccan,gitz r 0lf 3.t8h.) k7qrow it, and what height did it reach?    m/s (Round to the nearest integer)    m

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60#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
An object starts from rest and falls under the influence of gravity. Draw gr cobl-:m6u 5uxd8mj tz3vwb62aphs of (a) its speed and (b) the distance it has fallen, as a function ofbz2cd:68 bumxtwu5 3-6lj vom time from t = 0 to t = 5.00 s . Ignore air resistance.
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61#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A helicopter is ascending vertically with a speed of 5.20 m/s. At a hei9ttyp p 87-ygoght of 125 m above the Earth, a package is dropped from a window. How much yypo 9g78-tpttime does it take for the package to reach the ground? [Hint: The package’s initial speed equals the helicopter’s.] t =__ s
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62#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
For an object falling freely from rest, show that the distaa8:)6vg njhwq:75ifzpbg2egx ,pag /nce traveled during each sup8wggae, 7n:x5b2 6:h )ip gajqz /gvfccessive second increases in the ratio of successive odd integers (1, 3, 5, etc.). This was first shown by Galileo. See Figs. 2–18 and 2–21.
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63#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
If air resistance is neglected, show (algebraically) that a ba -+e sim2kna:wkl) paz57d f,ull thrown vertically upward wite,:ldsp72kiu+naz 5 fa kwm) -h a speed $v_0$ will have the same speed, $v_0$, when it comes back down to the starting point.
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64#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A stone is thrown vertically upward with a om wdgu6.a8arf1+d1 a speed of 18.0 m/s
(a) How fast is it moving when it reaches a height of 11.0 m? |v| =    m/s
(b) How long is required to reach this height? t =    s,    s
(c) Why are there two answers to (b)?

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65#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Estimate the time between each photoflash of the applu1w0o y x2zdgh* gp5w0e in Fig. 2–18 (or number of photoflashes per second). Assume the apple is about 10 cm in diameter. [Hint: Use two apple positions, but not the unclear ones u02g5hgwz d0x1 w*opyat the top.]
T =    s
   flashes per second

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66#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A falling stone takes 0.28 s to trgksof jo +eb.)mj;m, 8avel past a window 2.2 m tall (Fig. 2–32). From what height abo s.+emo)8,m koj g;jbfve the top of the window did the stone fall?    m


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67#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A rock is dropped from a sea cliff, and the rzw+*y fi odq e:f9ij b4b-qs4p/)b)x sound of it striking the ocean is heard 3.2*r4qfqf9b - wzxp)y/d+ :)bioibes4j s later. If the speed of sound is 340 m/s , how high is the cliff? H =    m

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68#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose you adjust your garden hose4lzas22x- te u nozzle for a hard stream of water. You point the nozzle vertically upward at a height of 1.5 m above the ground (Fig. 2–33). When you quickly move t2x 4ls2a z-uethe nozzle away from the vertical, you hear the water striking the ground next to you for another 2.0 s. What is the water speed as it leaves the nozzle?    m/s


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69#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A stone is thrown vertically upward with a speed o.ph7g9msf8 f xtd( *vif 12.0 m/s from the edge of a cliff 70.0 m high (Fig. 2–34)*hs.im tg9v(7f xpd8f.
(a) How much later does it reach the bottom of the cliff? t =    s
(b) What is its speed just before hitting?    m/s
(c) What total distance did it travel?    m



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70#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A baseball is seen to pass upward by a window cb vc ; l vg2ak-c)s*(lilg3y jvi;(w728 m above the street with a vertical speed of 13 m/s If the ball wi7lv w*y vg2l3j( ;g-(ckcc)s vaib;las thrown from the street,
(a) what was its initial speed,    m/s
(b) what altitude does it reach,    m
(c) when was it thrown,    s
(d) when does it reach the street again?    s

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71#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Figure 2–29 shows the velocity of a train as a fun0w6o28+itij nu m9dail5exo/ ction of time. (a) At what time was its velocity greatest? (b) During what peri0mu6wo xiintl/2+ 58 i eo9jadods, if any, was the velocity constant? (c) During what periods, if any, was the acceleration constant? (d) When was the magnitude of the acceleration greatest?
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72#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The position of a rabbit along a straight tunnel as a function of time is plottetwojq:8d4e xx,:4d.qn;7l y:g wl tavd in Fig. 2–28. What is its instantaneous velocityw4y x:lw. t dtqo4;vl7dje,8 n g:qax:
(a) at t = 10.0 s    m/
(b) at t = 30.0 s What is its average velocity    m/s
(c) between t = 0 and t = 5.0 s    m/s
(d) between t = 25.0 s and t = 30.0 s    m/s
(e) between t = 40.0 s and t = 50.0 s ?    m/s

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73#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2–28,
(a) during what time periods, if any, is the velocity constant? t =    s to t $\approx$    s
(b) At what time is the velocity greatest? t =    s
(c) At what time, if any, is the velocity zero? t =    s
(d) Does the object move in one direction or in both directions during the time shown?



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74#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A certain type of automobile can accelerate approximately as s)pukj 432zfgva/s 4sjhown in the velocity–time graph of Fig. 2–35. (The short flat spots in the curve represent shifting o )/fkssvja4gj2z 3up4f the gears.)
(a) Estimate the average acceleration of the car in second gear and in fourth gear. The average acceleration in $2^{nd}$ gear is given by    $m/s^2$ The average acceleration in $4^{th}$ gear is given by    $m/s^2$
(b) Estimate how far the car traveled while in fourth gear.    m



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75#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Estimate the average acceleration of the w 6ch-e+fmafb,22l+e5fi a xecar in the previous Problem (Fig. 2–35) when it is in fecx e +6hl, 2im5 aw+2ebf-af
(a) first,    $m/s^2$
(b) third,    $m/s^2$
(c) fifth gear.    $m/s^2$
(d) What is its average acceleration through the first four gears?    $m/s^2$



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76#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2–29, estimate the distance the object traveled ( 9oxhi yvqflp)rcjc96y71o.during
(a) the first minute,   
(b) the second minute.    m



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77#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Construct the vs. t graph fordmlcp: c3m8 eg ch h(*zj,c:(sp(cl/e the object whose displacement as a function of time is given by Fi( ccd,l(csg*ech38hecjml /z(pmp:: g. 2–28.
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78#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Figure 2–36 is a position versus time graph fo rh)r7fn8p/7yc eh*ri r the motion of an object along the x axis. Consider the time interval from A to B. (a) Is the object moving in the positive or negative direction? (b) Is the object speeding up or slowing down? (c) Is the acceleration of the object positive or negative? Now consider the time interval from D to E. (d) Is the object moving in the positive or negative direction? (e) Is the object speeding up or slowing down? (f) Is the acceleration of the object positive or negative? (g) Finally, answer ) rpcie/rfhr7 *yhn87these same three questions for the time interval from C to D.
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79#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person jumps from a fourth-story window 15.0 m abel w8 t1irrn g0/3df ey-yn3*vove a firefighter’s safety net. The survivor stretches 1*dln3w i8n-fe ev0 y3rtg/rythe net 1.0 m before coming to rest, Fig. 2–37.
(a) What was the average deceleration experienced by the survivor when she was slowed to rest by the net?    $m/s^2$
(b) What would you do to make it “safer” (that is, to generate a smaller deceleration): would you stiffen or loosen the net? Explain.  



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80#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
The acceleration due to gravity on the Moon is abx )yv)ow)p; hrr b,0chout one-sixth what it is on Earth. If an object is thrown vertically upward on the Moon, how many times higher will it go than it would on Earb0,vxrpo;h)wc) hy r )th, assuming the same initial velocity?
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81#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person who is properly constrained i mm40 1uv.wslby an over-the-shoulder seat belt has a good chance of surviving a car collision if the deceleration does not exceed about 30mmw1 liu.0vs4 “g’s” $(1.0 g\,=\,9.8\,m/s^2)$. Assuming uniform deceleration of this value, calculate the distance over which the front end of the car must be designed to collapse if a crash brings the car to rest from 100 km/h . $\approx$    m(retain one decimal places)

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82#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Agent Bond is standing on a bridge, 12 m above the road below, and his pursu0pti( 8ryfhy0m 3x (lvers are 08rhpm y0tx3( y(lifv getting too close for comfort. He spots a flatbed truck approaching at 25 m/s , which he measures by knowing that the telephone poles the truck is passing are 25 m apart in this country. The bed of the truck is 1.5 m above the road, and Bond quickly calculates how many poles away the truck should be when he jumps down from the bridge onto the truck to make his getaway. How many poles is it?    poles

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83#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a car manufacturer tested its cars for front-end collisions;ybz t z1-(hmn31dt gjtp -(pe by hauling them up on a crane and dropping tzntgbyh(;1d(m1zpte3 - pj -them from a certain height.
(a) Show that the speed just before a car hits the ground, after falling from rest a vertical distance H, is given by $\sqrt{2gH}$ . What height corresponds to a collision at
(b) 60 km/h ? $\approx$    m (Round to the nearest integer)
(c) 100 km/h ? $\approx$    m (Round to the nearest integer)

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84#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Every year the Earth trave6js 9,tm.1u9h fcyzyw ls about $10^9\,km$ as it orbits the Sun. What is Earth’s average speed in km/h?    $ \times10^{ 5}\,km/h $

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85#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A 95-m-long train begins uniform acceleration from rest. The fr)nusvl ;l pz0 /f41qacont of the train has a speed of 25 m/s when it passes a railway worker who is standing 180 m from where the front of the train started. What will)qv4/;cp aszlf01nlu be the speed of the last car as it passes the worker? (See Fig. 2–38.)    m/s


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86#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A person jumps off a di ,9ns(gy+ a3tsto gzg;ving board 4.0 m above the water’s surface into a deep pool. The person’sgz+; n9o ts g,asygt3( downward motion stops 2.0 m below the surface of the water. Estimate the average deceleration of the person while under the water. $\approx$    $m/s^2$ (Round to the nearest integer)

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87#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In the design of a rapid transit system, it is necessary to balance thepgpl/3n p0xw2-co1yh average speed of a train against the distance between stops. /op- 2ly3hpgp1wn cx0The more stops there are, the slower the train’s average speed. To get an idea of this problem, calculate the time it takes a train to make a 9.0-km trip in two situations:
(a) the stations at which the trains must stop are 1.8 km apart (a total of 6 stations, including those at ends);    min
(b) the stations are 3.0 km apart (4 stations total). Assume that at each station the train accelerates at a rate of $1.1 m/s^2$ until it reaches 90 km/h then stays at this speed until its brakes are applied for arrival at the next station, at which time it decelerates at $-2.0 m/s^2$ Assume it stops at each intermediate station for 20 s.    min

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88#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Pelicans tuck their wings and free fall straight down when divinba7 ;q.numl 8og for fish. Suppose a pul7; q namob8.elican starts its dive from a height of 16.0 m and cannot change its path once committed. If it takes a fish 0.20 s to perform evasive action, at what minimum height must it spot the pelican to escape? Assume the fish is at the surface of the water.    m

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89#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In putting, the force with which a golfer strikes v-7lrab/k3t-+qex( yqed g/9 qzwd,za ball is planned so that the ball will stop within some small distance of the cup, say, 1.0 m long or short, in case the putt is missed. Accomplishing this from an uphill lie (that is, putting downhill, see Fig. 2–39) is more difficult than from a downhill lie. To see why, assume that on a particular green th/ ,xle/ a +tkwdeq - qg7v3-(bdzryq9ze ball decelerates constantly at $20 m/s^2$ going downhill, and constantly at $3.0 m/s^2$ going uphill. Suppose we have an uphill lie 7.0 m from the cup. Calculate the allowable range of initial velocities we may impart to the ball so that it stops in the range 1.0 m short to 1.0 m long of the cup.    m/s to    m/sDo the same for a downhill lie 7.0 m from the cup.    m/s to    m/sWhat in your results suggests that the downhill putt is more difficult?


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90#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A fugitive tries to hop on 1f sr(okt -vs 9p.izm8a freight train traveling at a constant speed of 6.0 m/s Just as an empty box car passes him, the fugitive starts from rest and accele-i tvzrf8k(ps.o s19 mrates at $a\,=\,4.0 m/s^2$ to his maximum speed of 8.0 m/s
(a) How long does it take him to catch up to the empty box car?    s
(b) What is the distance traveled to reach the box car?    m

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91#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A stone is dropped from the roof of a hav/ x .jr39frcigh building. A second stone is dropped 1ca3v9. rj/ rxf.50 s later. How far apart are the stones when the second one has reached a speed of 12.0 m/s ?    m

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92#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A race car driver must average 200.0 km/h over the course of a time trial last b9 lo.6dbzbz5ing ten laps. If the first nine9d bb oz65lz.b laps were done at 198.0 km/h . what average speed must be maintained for the last lap?    km/h

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93#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bicyclist in the Tour r-/kt0i8acq ,/ v uflbde France crests a mountain pass as he moves at 18 km/h . Aqku8,0clri-vb a/t/f t the bottom, 4.0 km farther, his speed is 75 km/h . What was his average acceleration (in $m/s^2$) while riding down the mountain?    $m/s^2$

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94#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two children are playing ob -9o jtr1p/yxn two trampolines. The first child can bounce up one-and-a jox1 b9/r-ytp-half times higher than the second child. The initial speed up of the second child is $5.0 m/s $.
(a) Find the maximum height the second child reaches. $\approx$    m(retain one decimal places)
(b) What is the initial speed of the first child? $\approx$    m/s(retain one decimal places)
(c) How long was the first child in the air?    s

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95#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An automobile traveling 95 km/h overtq6ly qasz ;;ykj *2 jk(-dbuh3akes a 1.10-km-long train traveling in the same direction on a track parallel to the road. If the train’s speed is 75 km/h . how long does it take the car to pass it, and how far will the car have traveled in kl6 * qbd3jus-jq ( yh;kyaz2;this time? See Fig. 2–40. What are the results if the car and train are traveling in opposite directions? t =    min The distance the car travels during this time is $\approx$    km(retain one decimal places) t =    min The distance the car travels during this time is $\approx$    km(retain one decimal places)


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96#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A baseball pitcher thhh i qisti(whj/hx87 .* ;qg+krows a baseball with a speed of 44 m/s In throwing the baseball, the pitcher accelerates the ball /ish*qiw gjh+8q(k h;hi 7t .xthrough a displacement of about 3.5 m, from behind the body to the point where it is released (Fig. 2–41). Estimate the average acceleration of the ball during the throwing motion.    $m/s^2$


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97#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A rocket rises vertically, from rexhrfrd.hbp-f6 x(3 vk:vr 1r7 st, with an acceleration of $3.2 m/s^2$ until it runs out of fuel at an altitude of 1200 m. After this point, its acceleration is that of gravity, downward.
(a) What is the velocity of the rocket when it runs out of fuel? $\approx$ =    m/s(Round to the nearest integer)
(b) How long does it take to reach this point? $\approx$ =    s(Round to the nearest integer)
(c) What maximum altitude does the rocket reach?    m
(d) How much time (total) does it take to reach maximum altitude? $\approx$ =    s(Round to the nearest integer)
(e) With what velocity does the rocket strike the Earth?    m/s
(f) How long (total) is it in the air?    s

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98#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Consider the street pattern shown in Fig. 2–42. Each intersectiolx ,y zm7e3ha:n has a traffic signal, and l,ya :xz73mh ethe speed limit is 50 km/s . Suppose you are driving from the west at the speed limit. When you are 10 m from the first intersection, all the lights turn green. The lights are green for 13 s each.
(a) Calculate the time needed to reach the third stoplight. Can you make it through all three lights without stopping?  
(b) Another car was stopped at the first light when all the lights turned green. It can accelerate at the rate of $2.0 m/s^2$ to the speed limit. Can the second car make it through all three lights without stopping?  



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99#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A police car at rest, passed by a speeder te 1;d;:e )dl n-jyou+rxkjr2traveling at a constant 120 km/h takes off in hot pursuit. The police offi:e1dk-r ;2no)djrj l+y;xu te cer catches up to the speeder in 750 m, maintaining a constant acceleration.
(a) Qualitatively plot the position vs. time graph for both cars from the police car’s start to the catch-up point. Calculate
(b) how long it took the police officer to overtake the speeder, $\approx$ =    s(Round to the nearest integer)
(c) the required police car acceleration, $\approx$ =    $m/s^2$(Round to the nearest integer)
(d) the speed of the police car at the overtaking point. $\approx$ =    m/s(Round to the nearest integer)

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100#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A stone is dropped from the roofxxu -8x. i: 6l24g:silol vfl f:p(ecrfx3q7h of a building; 2.00 s after that, a second stone is thrown straight down with an initial speed of 25(xo ff87 3x i .p6sex:q4 lllifu:cgxh -v2lr:.0 m/s and the two stones land at the same time.
(a) How long did it take the first stone to reach the ground? $t_1$ =    s
(b) How high is the building?    m
(c) What are the speeds of the two stones just before they hit the ground? #1    m/s #2    m/s

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101#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two stones are thrown vertically up at the same time. The first dp(.nrti0-(9q *ois, ll yg itstone is thrown with an initial velocity of 11.0 m/s from a 12th-floor balcony of a building and hits the ground after 4.5 s. With what initial velocity should the second stone be thrown ,r psl*in i (y-oil 0t9(d.qgtfrom a $4^{th}$-floor balcony so that it hits the ground at the same time as the first stone? Make simple assumptions, like equal-height floors.    m/s

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102#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If there were no air resistance, how long would it take a free-fallzqp3yum 49 y*fax6a7sap ./*+lbgu ubing parachutist to fall from a plane at 3200 m to an altita* uapsx*6bf7a.3g9 q +u p/lum by4zyude of 350 m, where she will pull her ripcord? What would her speed be at 350 m? (In reality, the air resistance will restrict her speed to perhaps 150 km/h .)
   s
   km/h

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103#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A fast-food restaurant uses a conveyor belt to send the bu3.zc ;ho2bh8wtrx ,xyrgers through a grilling machine. If the grilling machine is 1.1 m long and the burgers require 2.5 min to cook, how fast must ywzcrho 3bx8;,x t 2.hthe conveyor belt travel? If the burgers are spaced 15 cm apart, what is the rate of burger production (in burgers/min)?
   m/min
   $\frac{burgers}{min}$

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104#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Bill can throw a ball vertically at a speed 1.5 times fa csrakps p6l7. (wd+ -nj-lc7gster than Joe can. How many times higher as.kp cpc76d j -lsl-r+w(gn7 will Bill’s ball go than Joe’s? $\approx$ =    (retain one decimal places)

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105#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You stand at the top of a cliff while your friend stands on the groundu :oaog( m:*7 2ts*pyvcsis t. below you. You drop a ball from rest and see that it takes 1.2 s for the ball to hit the ground below. Your friend then picks up the ball and throws it up to you, such that u ci::st(7p.gassmvo*yo t*2it just comes to rest in your hand. What is the speed with which your friend threw the ball?    m/s

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106#
 
填空题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two students are asked to find the+ evc yyfv)waa:c2;*j height of a particular building using a barometer. Instead of using the barometer as an altitude-measuring device, they take it to the roof of the building and drop it off, timing its fall. One student reports a fall time of 2.0 s, and the other, 2.3 s.:;2aa)cyvvyw+e fcj* How much difference does the 0.3 s make for the estimates of the building’s height?    m

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107#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
Figure 2–43 shows the position vb3 vefzchb0)7e9 i tz6s. time graph for two bicycles, A and B. (a) Is there any instant at which the two bicycles have the same velocity? (b) Which bicycle has the larger acceleration? (c) At which instant(s) are the bicycles passing each other? Which bicycle is passin zhb 3 6tvf0e9)z7cbieg the other? (d) Which bicycle has the highest instantaneous velocity? (e) Which bicycle has the higher average velocity?
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