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习题练习:Physics Bowl by Topic 2: Kinematics - part I General Motion

 作者: admin   总分: 72分  得分: _____________

答题人: 游客未登录  开始时间: 24年03月31日 09:50  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  
  10.10: A particle travels at a constant speed a, 7ey,peh,4k rl2lqvqround a circular path of radius $R$, if the particle makes one complete trip around the entire circle, what is the magnitude of the displacement for this trip?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.01: The change of di- j9(svv2etocs:y6+x lji/ ocstance per unit time without reference to a particular direction is j /cyos-9etoxi2 v + jc:(v6slcalled

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  12.29: A vehicle completes one lap around a circular track at an x(9x6obl)lwk-cv f z+average speed of 50 m/s and then completes a second lap at an average l-+(z)lowc 9 v6kbfx xspeed of $V$. The average speed of the vehicle for the completion of both laps was 80 m/s. What was the average speed $V$ of the second lap?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  95.03: A toy car moves 0.80 m in 1.0 s at the constant velocity. If i.iq 6qob0 i(w6dtyd9s t continues, bdto9i.i q6(0 s 6qydwhow far will it travel in 3.0 s?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  05.34: A 40-kg boy is stationary on a 30-kg plank that icrx:- ke3w okd8zd(d+s sliding at 5.00 m/s to the right across a frictionless pd(3-kk r8exo :wdd +czond. The boy then turns and starts walking on the plank at a rate of 4.00 m/s to the left, relative to the plank. What is the speed of the plank relative to the pond now?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.18: A motorist travels 400 km at 80 km/h and 400 km at 100 km/h. Whx cvsoq l:6/p9)b6vgl 6jdl5 cat is the aveb9o spcl:)/xv5lcl6vg qd 6j6rage speed of the motorist on this trip?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.20: This question refers to the motion of w ig:y3ajucu2lg-f,0a toy car traveling along the x-axis. The graph shown below is a plot of the0 3iwcyg-lg 2 fjuau,: car’s velocity in the x direction, $v_x$ versus time $t$.
During what time interval was the car moving towards its initial position at constant velocity?


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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.21: This question refers to the motion ofjw:;yzo 7rj-i4l xx*g a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the x di4xw-jjr7l; g zoix:* yrection, $v_x$ versus time $t$.What was the acceleration at 33 s?


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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.22: This question refers to the motion of a toy car traveliz,mo/xtj+pr so) jg/ )ng along the x-axis. The graph shown below is a plot of the car’s velocity in the x d/ot) jo,/zp )m+gxjrsirection, $v_x$ versus time $t$.
How far did the car travel during the first 15 seconds?


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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.15: Given the graph of the velocity vs. tlus/t9aoq2h3 ime of a duck flying due south for the winter.lht s3/9 oauq2 At what point did the duck stop its forward motion?





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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.17: This question refer to the diagram below which /yycdc t ye4- o r5tfl0d/q7q1l jv6z;shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straightrtovq64tldjc d -zqe//1y f;5l0y 7yc line. What was the average velocity of the car during the third second?


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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.18: This question refer to tlgq):zaz)r7il qy4 ,ihe diagram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating inzairz4iq)7lyq g, l): a straight line. The average acceleration during the entire 3 second interval is closest to


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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.20: What is the shap:ae/)ztcjha4 1s9h ls /p9a bq;tzsh7e of the velocity time graph for an object with the position time zts:9a/4qjcs;9/ l h h7 1sezat a)bhpgraph shown in the diagram at right?


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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.28: The following questnj -lg , ht :cbeqw8r)89zu6qyion refer to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the f)zyqt8n-l bhu8 q9,: 6wejg rcloor and rebounds to its original height.
Which of the following graphs would best represent the distance above the floor versus time for the above bouncing ball?


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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.29: The following question refel ;wm h5ebz3 95djx:jj1 d1(u3h d-8czdfrlohr to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its o;9l8jz rb3d-j d:jh o3(udf mlx1c zh5d15ehwriginal height.
Which of the following would best represent acceleration versus time for the bouncing ball?


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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.39: If a boat can travel with a speed oy e2ifa*a 7rxv6mc ,-wf $v$ in still water, which of the following trips will take the least amount of time.

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.01: The question refers to the followk3td6yt grdh-m5z/fc ri7.rdk-b(t 4ing scenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
During which time interval would cars #2 and #3 be moving at the same average speed?


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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.02: The question refers to the follp ; (*ntzjj,v3 xlsj48xfgvkhw4y n 9w9kpf/6owing scenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
About what position after $t_0$ would car #1 and car #2 have been side by side?


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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.03: The question refers tols7q+6 9czo.uus7n;wz v.ah u the following scenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
Which of the three cars had the greatest average speed during these 5 seconds?


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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.04: The question refers to the following snv 5y1l ka42apcenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
If car #3 continues to constantly accelerate at the same rate what will be its position at the end of 6 seconds?


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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.33: A small ball rolls down a ramp, across a horizontal tabl 6o3 4enr66 jrg0kcbf/lzrqv:e top and off the table edge. Which of the follo:0gkcb fq rr6e zjl/ro3v6n64wing would best represent a graph of the magnitude of the ball's acceleration vs time?


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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.01: The graph repz vu3lz*gvdb n6l 1py/v.:4 *iemzo;gresents the relationship between distance and time for an object that is moving along a straigg*i14v*z 3 ue;zd lvn m:bgyvozpl6./ht line. What is the instantaneous speed of the object at t = 5.0 seconds?


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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.02: The graph represents the relationship between dis 5nzl0vptzkr 5h -r38xtance and time for an obj3 pnkr hv0zx55tlz-r 8ect that is moving along a straight line. Between what times did the object have a non-zero acceleration?


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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.07: A small object is thrown straight dob 02lrt hqfx8- s2.8act)rm xbwnward on Earth with an initial speed of 12.0 m/s from a position 10.0 m above the g)8htrb.arx 0 lmf-8 xbst2c q2round. Ignoring air resistance, the speed of the object when it reaches the ground is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.11: The diagram below represents a toy car starting fr; gz/5crd/llsqagcr1bv38 )w om rest and uniformly accelerating across the floor. The time and dista8cgrvg 1 lq3; /l)cb zr/s5wadnce traveled from the start are shown in the diagram.
What was the average speed of the cart between 0.1 seconds and 0.3 seconds?


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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.12: The diagram below represents a toy car starting from rest s3vf(eq/ cq3o52 2mpql a69z lzmqxi.and uniformly accelerating across the floor. The time and /qs39ixzvm3ole cm(2q 5zaq f. lp6 2qdistance traveled from the start are shown in the diagram.
What was the acceleration of the cart during the first 0.4 seconds?


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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.13: The diagram below represents a toy car starting from rest and unih3my all9h vzkb 4)v4m;)j7z iformly accelerating across the floor. The time and distance traveled from the start are shownhzabv)lv7 j 44l z3i;)k9hmym in the diagram.
What was the instantaneous velocity of the cart at 96 centimeters from the start?


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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.08: The diagram shows a uniformly accele.ij ai7j)btw1u;n)rkc c : ew/rating ball. The position of the ball each secbr/:1c )t ej kn7; wj.aw)uiicond is indicated.
What is the average speed of the ball between 3 and 4 seconds?


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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.09: The diagram shows a uniformly accelerating ball. The position of thqhju* +j6pr/ aut.om(e ball eatu.ohm(ap/q *jju6 +rch second is indicated.
Which of the following is closest to the acceleration of the ball?


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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.17: The motion of a circus clown on a unicycle moving in a straight2k oyl2ij7fy ) line is shown in the graph beloko 2yyil7j2f) w.
What would be the acceleration of the clown at 5 s?


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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.18: The motion of axp,fy b 2 pxi4 s,3n2cf q+n83ecx4fzo circus clown on a unicycle moving in a straight line is shown in t z ceop8 4nx3 xbs24cf,3qpnyfi,xf2+he graph below.
After 12 seconds, how far is the clown from her original starting point?


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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.04: When an object falls freely in a vacuu+cxa0 60y xw )irr*e1cuzb6 alm near the surface of the earth

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.11: The accompanying graph describes the motion of a marble ots.ecev8** 7 btd4 im1bo2x+agd.fkwn a table top for 10 seconds. For which time interval(s) did the maodt4bs** +v7.x8 e i c1dwgftbm2 ke.arble have a negative velocity?


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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.12: The accompanying graph descry*y5b u dwwp eb30o;1eibes the motion of a marble on a table top for 10 seconds. For which time interval(s) did the marble have a positive acceleration? 0yu*3eyw1 p debb5ow;


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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.13: The accompanying graph describes the motqluqki+ k 8.9h52uj /)jqeoxbion of a marble on a table top for 10 seconds. What is the marbles average o2qih j.ulq) ku bxj+ek 8/5q9acceleration between t = 3.3 s and t = 3.8 s


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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.20: A car accelerates uniformly from rei ,a idqg(ti.mo+s;g( st for a time of $2.00\;s$ through a distance of $4.00\;m$. What was the acceleration of the car?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.06: An object, thrown st*bksr8i g1qve m11n 00h+uw:s gm *jntraight downward with a speed of $20.0\;m/s$, takes $2.00\;s$ to reach the ground below. From what height above the ground was the object thrown? Ignore air resistance.

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.03: Which of the following graphs could correctly rc.jqe6kp n;4slsxa/6epresent the motion of an object moving with a coe al6j4xp/q ;ns.c6s knstant speed in a straight line?


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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.24:The accompanying7m qyx f1 3c )4)omlpli1eqky. graph describes the motion of a toy car across the floor for 10 seconm clfqyk1y.i3 moel 7))4p1 qxds. What is the acceleration of the toy car at t = 4 s?


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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.25:The accompanying graph describes the m d kbx0o(+.msa5qb4hox1wvr2-cz d4iotion of a toy car across the floor for 10 seconds. What was the total displaceme4-+kq v4bo( .1mbcd0 w5zad 2xhisorxnt of the toy car for the entire 10 second interval shown?


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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.26:The accompanying graph describwtyrp*jcuep f +85 k;z8oodden.w:+4es the motion of a toy car across the floor for 10 seconds. At what times or time intervals must the netfdwo5n.y; 8 t ku 8c +*z4o+epp:rdwej force on the toy car be zero?


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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.03: A car accelerates zyt4f9z7 soqmg10)- : tgvdxuuniformly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best represents the acceleration of the car?u:x)t1gq0y t gzs7o d9 4m-fzv

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.07: A car has the velocity versus time curve shown. Which of the followil2irr* w/t7 vcuytw0 ;ng stat; 072tryrwuw i vcl*/tements regarding its motion is NOT CORRECT?


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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.17: A toy car moves along the x-axis accordi;e th; hmzfg,d63u0m lng to the velocity versus time curve shown tfh ue;d;g zlmm,t36h 0o the right. When does the car have zero acceleration?


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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.22: During an interval of time, a tennis ball is mozb: ji+jm6sr.xeak*6 wxvm mbbp0ez1.e ;e80ved so that the angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true about thez.mbvr*bbj z.x1 0 80wj: mme6a+ ix6esepk;e tennis ball during this interval of time?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.03: Two automobiles are 1s db /mqb96bon4gu c .oy-4(gq50 kilometers apart and traveling toward each other.b nu-b4mb94o y ogqq/cs6g(. d
is moving at 60 km/h and the other is moving at 40 km/h. In how many hours will they meet?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.04: A particle moves elxk + l2i2q7p 7bfnu ;o;mr3non the x-axis. When the acceleration is positive and increasinl ;fo727iunr3 2x eqnkpm+bl ;g

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.12: The definition of avez-l6u u,,arg ke1ke;z9txi/e rage velocity is

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.18: For any motion in two dimensions, which one of the following choi uo ;hadw:9z)fces identifies quantities that must ;d)z af9w ho:uhave the same direction?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.17: A toy car move8ck2l4k g/kmsvw lvtd t47(6 js $3.0\;m$ to the North in 1 second. The car then moves at $9.0\;m/s$ due South for 2 seconds. What is the average speed of the car for this three second trip?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.05: The position-time,*tn8)chb /8x wvb4fdm+)n wti $y\;vs\;t$, graph for the motion of an object is shown. What would be a reasonable equation for the acceleration that would account for this motion?


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.31: A car moves to the right alon16u3 hervn.k x ap*9ulg a one-dimensional track for total time T in. lu 9*xrn1v kpau3e6h two parts.
• Part One: The car maintains constant non-zero speed V for the first $\frac{3}{4}$ of the total time.
• Part Two: The car accelerates uniformly to rest during the last $\frac{1}{4}$ of the total time.
What is the ratio of the distance traveled during Part One of the trip to the distance traveled during Part Two of the trip?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.23: The velocity vs. time graph for the moti:..) nvqrri hz;4rhedon of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that the car starts at oq.z ):4i errhvh; .drnrigin $x=0$. At which time is the car the greatest distance from the origin?


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.24: The velocity vs. time graph for the motion of a car ea.a(3 h.;hoktbtcw*u vi npv4hz* ;hh e6o*,on a straight track is shown in the diagram. The thick line represents th6*h,heteu(4 *;w;3cat . vb hooi*k.han hv pze velocity. Assume that the car starts at origin $x=0$. What is the average speed of the car for the 10 second interval?


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.08: Consider the motion of an obnz08 i5j f(pviu4cg5 xject given by the position vs. time graph shown. (5uvc48pg ifzni05jx For what time(s) is the speed of the object greatest?


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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.11: Consider the motion of an object given by the velocity vs. tihkyi q)xhc p5l):-g)z wx2v p)me graph shown. For whic5wyx2i h -qv)z ph)xgp))ck: lh time(s) is the acceleration of the object equal to 0?


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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.24: By computing theb 36jt +qxzyj+h* x34-k kapyy area under the acceleration vs. time graph for a fixed time intex4ykjk-jx t+ypy+qzh6a3* 3 brval of an object’s motion, what quantity has been determined for that object?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.08: An object moves along a horizontal line xa7ub1l7 tuh1 0 c(iiowith increasing speed.
choices could represent the signs of the velocity and of the acceleration for the object to achieve this motion?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.14: A car makes a trip i u ba7dmxz3/jpx8:5gtw 6c2bi n two parts:
Part 1: it travels a distance of 800 m at a constant speed of 4.0 m/s.
Part 2: it travels a distance of 1200 m at a constant speed of 20.0 m/s.
What is the average speed of the car for the entire two-part trip?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.02:A small object is releaithr /i4; t.vrsed from rest and reaches the ground in a time of $2.50\;s$. Neglect air resistance. With what speed does the object reach the ground?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.03:A small object is released from rest and reaches the ground ky8r36mhf3t3 bh 7sb9 xu a7kvin a time of $2.50\;s$. Neglect air resistance. From what height above the ground was the object released?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.17: A position vs. time graph of a particle moving along a horizontal 2( 98nv;l fpwxp*nanidk0+yr axis is shown. What is the total dpp i*dx(2 k+lf;n wnr8a n0vy9istance traveled by the particle from t=0 to t=10s ?


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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.18: Which one of the following choices correctly identi.l5oz z-z ,9)t i.wytc zqtps;s8bpru ,j1lk.fies all of the listed situations for which there isztzz y s 8.t5z,.s9t kl qo-j1p.icwlpu)r,b; a non-zero acceleration?
Situation I : A point object moves in a straight line with increasing speed.
Situation II : A point object moves in a circular path with constant speed.
Situation III: A point objects moves in a circular path with decreasing speed.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.32: An acceleration vs. time ) r/ ha:xrk1kfgraph for an object moving along a line is shown. The object starts from rest rkak1:/h)x rf at time t=0 s. At what time(s) does the object attain a maximum displacement from its starting position?


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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.17: An object starts at dcp0: ,krzqn0(qm 7*y +cdklz the origin and its velocity along a line vs. time is graphed. Which one of0lzk ,c c(d 0ndmz*:r +yp7kqq the following choices best gives the proper interval(s) of time for which the object is moving away from the origin?


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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.09: Two cars are moving to the right on a horizontal tru 34uc:ev4 koe;a.sbe ack, each with constant accelerau4boe :c.u;a34evkes tion. At an instant of time, the information about the cars is shown:
Car #1: position = 125.0 m; velocity = 13.0 m/s; constant acceleration = $1.5\;m/s^2$
Car #2: position = 80.0 m; velocity = 9.30 m/s; constant acceleration = $5.5\;m/s^2$
During the next 1.0 second of motion, which one of the following choices best represents what happens to the distance between the cars?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.14: A particle has a positio36( * ;dce5jpx tmjlymd/n;b on $x$, as a function of time $t$, given as $x(t) = -15 - 25t + 10t^2$. Which one of the following choices represents the magnitude of the particle’s acceleration? All quantities are expressed in base SI units.

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.41: For the entire time shown in thek8dz -ntx4r0z uj5 e,khm g;/y graph, which one of the following choices correctly describes the relationship by tz n/h-8;,rj mgkkzu50ex4 detween the average speed of the truck to that of the car?


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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.42: Which one of w1cynotpq6br b3u .5 +the following choices best describes the instants of time, at which tq r+1.bu6ob cwp t53ynhe car and truck travel with the same speed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.30: Two cars P and Q, each start from rest at the origin and wiloiv;2bpc+tn+zh 3*rs l move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the following choices correctly identifies the relationsr*+ hzin vb;t c3p2s+ohip for both the speeds $v$ and the positions $x$ of the cars at time T?


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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.02: The position vs. time graph of an object moving d7td 2s0mjp7y5 nub7m+ avvf:on a horizontal line is shpv v d+7f7:mdsmantyj7 bu502own. At what time(s) is the object moving with its greatest speed?


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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.08: A mass moves along the x-axis following theruww e qccr*0(pn71- r5 hxto* position vs. time graph provided. During what time interval(s) dorhr50p1 *n7*owe(- qwtruxc ces the mass have zero acceleration?


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总分:72分 及格:43.2分 时间:不限时
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