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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: 匿名未登录  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 ar64aro jyyt-/ yound 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 distance per unit time withoutqin unv,+h8g* reference to a particular direction8q+gvnnu, hi * is called

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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 circu f(rxzpe41 :czijm xvx3a 2cvm8t;0;9 cxsx 2elar track at an average speed of 50 m/s and then completes a second lapx4a09xxepxz;v e(sjmcvxc:r1 cm3fz 28ti 2 ; at an average speed 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 it contin n8+m 3-co6f4rutk1stu /byw rues, how far will it travel in 3.0 s8s6-rob ru cttym u1/fkw34n+?

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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 is slidingx-x6k owp5 wxj +pn8t44hvmc9zo 7+ dw at 5.00 m/s to the right across a frictionless pond. The boy then turns and startso 9pc8vm4 5kxw + wxdotjhn46-w7z xp+ 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 7-v8x o5ud( skcy vry/ k2y8tqand 400 km at 100 km/h. What is the average s8ydctv kvosu 8/k y5y(q-2 xr7peed 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 a toy car traveling along 6 ytw /1, yg+gmcwjo*athe x-axis.c6+w,ym/o wa1t*yggj The graph shown below is a plot of the 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 of a toy car traveling along the fjjl x+ f4 k8snlv-42vlj;*2kbi3wljx-axis. The graph shown below is a plot of the car’s velocity in t;sj8 v4in3w lj 24fk*+x2lf l-blkjvjhe x direction, $v_x$ 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 traveling g5h;j, pm.xz9voqw38mcot )s sh v);walong the x-axis. The graph shown below is a plot of the car’s velocity in th,qsgmz;svooc ))8hp wwh 9 3;.tvmx5je x direction, $v_x$ 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. time of a duck flying due southy jzugy5 n30 ydci5w 15/amq7f for the winter. At what point did the duck stop its forward mzi q3f155 gu 0cadjywm7/ny5yotion?





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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 dia3g j- dlasg59w y1fzqp gm+m:8gram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the average velocity of the car during the third second?pq+95masdfm:g - 1g3wly 8z gj


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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 the diagram below which shows the position6ksg d;4(qa ah and elapsed time of a car starting from q (; 6akdga4hsrest and uniformly accelerating in 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 shape of the velocity time graph for an objed6 mg tm-s 275sp*fuzuct with the positio fs2*t-dmug76z 5 pmusn time graph 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 question c jq8nu75v7juz49yn qrefer 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 original height.unu7n7zj8v j4c qyq5 9
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 refer to the following information. An ideal equm:nkw d880jg/4 cpulastic rubber ball is dropped from a height of about 2 meted0: ugpuwkjn4m / 88qcrs, hits the floor and rebounds to its original 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 tr3q0)x/ d5f7k 1 8fttcm*r2 ymrx d 2ekk+epjsyavel with a speed of $v$ 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 resq*dlsj on5doq w9lz o 3;0h 5d93kgz/;zibo:fers to 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.
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 evksw fb,xmffx .z;8 nx-e(mpg:8 y8+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.
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 to the following tx8 qtmq0alel.,w4b3 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 scenha 7:jja+ds:c ario: 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 table top a;3 iamdile2e1hiwa;cf n ./e1nd off the table edge. Which of the following would best represent a graph of the magnitude of the bac 1 /f i3em1id2ehl;wnae.; aill'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 represents the relr6nf4j bw5 p1vationship between distance and time for an object that is moving along a straight line. What is the instantaneous speed of the object at t = 5.0 secondsnvrbfj1p 465w?


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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 distance and time for an,e7.f2o5 hx vla(ecsk object that is moving along a straight line. B hs2 fa,lv(eco 5.7exketween 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 downward onwl5y/ x uq:qi6 Earth with an initial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resistance, the speed of the object when it reaches thiw :qyl56q/ux e 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 from rest and unifokyb6a46v f9( md qw3dcrmly accelerating across9w(yk 3 4qm 66cdabvdf the floor. The time and distance 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 repkeeu/, ,3qsz uresents a toy car starting from rest and uniformly accelerating across the fs ,qu/ueez, k3loor. The time and distance 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 belr mhe/ 8hajqv9qq* r 3/ufxrp31 puf82ow represents a toy car starting from rest and uniformly accelerating acrovxqurhf1* r8h3uj/p9r pe2 /8aqfmq3ss the floor. The time and distance traveled from the start are shown 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 u46f ,hzm4bxf3p, st- d;fwkuyniformly accelerating ball. The position of the ball each sfxu4f4kt,bysmdh 63p;-f z,wecond 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 thccnf5 n7)mdz)e .ynd;hr y x07* 0hhtpe ball each second is in .5x;z*m0h r7f )dtn c7)hp hndcyyne0dicated.
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 on8ibp (gy8nx7z/h qob +o*)lj h a unicycle moving in a straight line is shown in the graonqzhx/*oiy pbb7lg8+8(j h)ph below.
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 a circus clown onc1 +i)zvbzxn61k8j3 : q mjzal a unicycle moving in a straight line is shj1m:v)1k863cxajq iz nl+ bzzown in the 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 p/d -l ,6axkjwd5 pkdcij 5-p/a vacuum 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 mot6b/ fusqcz 1 jwa45j+tion of a marble on a table top for 10 seconds. For which time interval(s) did the marble have a nega4tucw6/z1 b5j sjf+q ative 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 describes the motion of a marble lacp0j w1+869x: 4itvm(nh.y yy ieju on a table top for 10 seconds. For which time intervaltyyei+y4a.68mjhix l uw c 109:n(pvj(s) did the marble have a positive acceleration?


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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 a*1 h * t*rtwgs:4zejuk/2qz5cth 7r rgraph describes the motion of a marble on a table top for 10 secrtge*k u1sa*z5r:2 rq 4/*7j htwzhtconds. What is the marbles average acceleration 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 restt*o9n:ixs0bmew41y ik8. uig 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 straightv:eb g;gzb53 p43adyk 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 nd4s*ou9 a8jzh4bub*xo 4ni 3represent the motion of an object moving with a constant speed in a s*uuonz4 b8o4bn 4i*a3s9d jxhtraight 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 accompanying graph describesys0t : g9id*x6ai xz3n the motion of a toy car across the floor for 10 seconds. 93a: zg6y*d ixni0txsWhat 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 motion of c6*g exrol3cx4 bhh03a toy car across the floor for 10 seconds. What was the total displacement of the toy car for the entire 10 s6ogb h43 clx* xer0ch3econd 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 describes the motion q.vho7 335nxc gri ke: qkg3vxqy*c 58of a toy car across the floor for 10 seconds. At what times or time ikg.k cqc*yxe 5 x7i:3qvg8hqr3 5 v3onntervals must the net 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 uniformly fromo q1uxt;kod4+7 r oo2m 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best represents the acceleratioorkm4 1o7+q txod2u ;on of the car?

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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(;fmf pfg3ouk w/z0g/ shown. Which of the following statements 3f/f0uzgpo/(m gk;wf 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-axi-q,nl -ctwb 7igej 3,fs according to the velocity versus time curve shown to the right. When does the car ha3b- 7l -fegiq,nw, tcjve 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 moved so that the ang: 6,bowwd b.u31y0lkmal 2pdq le between the velocity and ,y:uw2ao dkb13 d bl6pml.0wq the acceleration of the ball is kept at a constant 120 degree. Which statement is true about the 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 ar( f50c :p:xhndvrep +*s x4grbe 150 kilometers apart and traveling toward each other.s:*px (c+dgh: ev5prrf4x0 nb
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 on the x-axis. When the acceleration is positive and inc:+7cz3w ix +uc msrty.reasin. zw+ uccys 3+7:rxmtig

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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 average veln pu9c./zz(v socity 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 +atk o8xkz.i4l9 vdt 0one of the following choices identifies quantities thai.9ktk+da tzvxo 8l40t must have 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 moves2mn d0.ug hv/p $3.0\;m$ 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, 52* na,t,3 ;n8ja xglvspizvh$y\;vs\;t$, 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 along a one-dimen 8li pc0;bk80er:bjxisional track for total time T in two parts.bji8kp 08i b0;:lrxce
• 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 motion o /)+y0 toxhss4h+bd ulf a car on a straight track is shown in the diagram. The t +x/ohu0s4dlsy)tbh +hick line represents the velocity. Assume that the car starts at origin $x=0$. 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 thy2o ba6 ft4).vzi8qlie motion of a car on a straight track is shown in the diagram. The thick line repiybqli284zot.6)vf aresents the 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 m r 8.j*w)iut.iss oqw uua+(6kotion of an object given by the position vs. time graph shown. For what time(s) is the speed otaui..*(qjss8 w+u ruiow6k )f 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. time z2m;9t2 3l:6jbe:ku frvxi p3px +n wygraph shown. For which time(s) is the acceleration of the object ew9 e kmv:b3jxp2 +rznf i t6ulyp;2x:3qual 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 the area under the acceleration vs. time graph for a he62wplw*serr) 5kb6 fixed time interval of an object’s motion, what quantity has been determined f*ew6w5 r62rl)s bkeph or 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 h/8t2gl dhf xq;orizontal line with 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 in89i4put0 bv j+,ut mtg 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 released from rest andf1sva uvds273 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 in a h.;fnvqfv) u. obxj57 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 horiz7sdw h3z w;.kpontal axis is shown. What is the total distance traveled by the particle from t=0 to t=10.s; zkpw7hwd3 s ?


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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 identifies all of the listel v-jjb8tawuu 1 f7fi:57jksm 79ky0dd situations for which thb05 7fwj1 yu78:jj7 tksvlmfiaudk- 9ere is 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 graph for an objectbbpw2 u2gio)+ ewi4ud18n9 ba moving along a line is shown. The object starts from rest at time t=0 s. At what time(s) does the oboan 42+ 8wge9p2uwubi)1 b bdiject 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 the origin and its velocity along a line vs. t /jmuxc*)4n oaime is graphed. Which one of the following choices best gives the proper interval(s) o* jmucx4 o)an/f 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 track, each witmpp0wsx .d9 r) ror)i(h constant acceleration. At an instant of time, the information about the caro9 p)w (irm)psdx0rr .s 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 positio:c 8kuistr9e8n $x$, 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 the gr0) umpu;k lm5aaph, which one of the following choices correctly describes the relationu0 p5;)makum lship between 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 the following choices best describes the instants of time,u ql 2oze(3jlw5:dn a 5pcj53f at which th2p5 oa5l ude35 zjjl3cfw:q(n e 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,6ls tpc -*5uch each start from rest at the origin and will move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the followinglcu*t 6pc s-h5 choices correctly identifies the relationship 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 movil7wu b2e-:im e8 jo,elng on a horizontal line is shown. eo8 :e72-m llbuwie ,jAt 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 the position vs. time graph proxrx( i4lebqg. 9 ygi/,vir/x, ( gi9ly4xbi.qegded. During what time interval(s) does the mass have zero acceleration?


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