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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 arouf9f*, 3ptp)exz0+be7sipnnw nd 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 without refere-; ig 7ainslxot-l j(2nce to a particular directixg-l -t2nsol 7i(j;a ion 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 complej7ii w v--)icstes one lap around a circular track at an average speed of 50 m/s and then completes a second lap at an average speed-v i-sc7)jwii 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 conti4.r x3yimaq*y er6 6qfnues, how far wirxi.6f*ymr a64qeq 3yll 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 is sliding at 5.00 m/stm.4p2p d flm, to the right across a frictionless pond. The boy then turns and starts walking on the plank at a rate of 4.00 m/s to the left, relative to the lpf md2,tpm4.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. What is)*.mxzs;plmprd u/ y / the avera;/pm)r .s/yxd* ulz mpge 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 mc, 9zpdt /mxz6l4pr.i otion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s /r4,zlcppd69im zt . xvelocity 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 alksvn0fdc lg )j.1;0ja ong the x-axis. The graph show . ajdkfv1c)0;g0sn jln below is a plot of the car’s velocity in the 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 n:soi7c5o)e bxtt0+vxiv s 05 toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the)+n70 ev x: cx5osvtitb0soi5 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 ve ow;8t70zaon-q zfqd1locity vs. time of a duck flying due south for the winter. At what point did oaof17-0zndtzqq;w 8the 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 belwk9 ;i2q c/pak1uzfx+ow which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a str2qkc + 1kx9izu;apf /waight 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 the diagra(u-wlk9 :h xkom below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleration during the entire 3 seconk(lhxk -9wo:ud 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 veloce:dai+ i8tag8ity time graph for an object with the position time graph shown in the diagram at righi: +daie8g 8att?


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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 refer to the following information. z fp+ y 8wrteftd2t )n9wpib5r4/d:9f An ideal elastic rubber ball4wd t 59:yetzn9ftb+i /pr2p)8 rdfwf is dropped from a height of about 2 meters, hits the floor 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 pf:c(cb* 7hgg question refer to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits (g 7*cghcpf:b 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 travel wl2(gj az ,bv/52crntrith 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 refers to the followi*eslv(utb5a d92t;fpng 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 refersitl e4pg d:r5q,.,*biylo+jn id kc5m-zi 5t5 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.
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 ref4 h/cte1r 75m teipxy3ers 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.
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 tosavd:+ul r6k* mms k0(nx.vt62up (sr 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.
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 dwh+*by cl (q)qbc+of .own a ramp, across a horizontal table top and off the table edge. Which of theb)q+ho w*(ylc fq.+ bc following 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 represents the relationship between distanmn rs):v+z u3bce and time for an object that is moving n3)usv zrb+ m:along a straight 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 distance and v z4ktek6 ka*t23t o(otime for an object that is moving along a straight line. Between what times did th*4t 32zv o(k6e tktakoe 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 on Earth with an 39l-khmql7,hikbtc0 initial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resisl7k-3h9bh t,mi clkq 0tance, 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 from re)i) thq*ams+bw,q.a yst and uniformly accelerating across the floor. The time and distance traveled froms.))yaqt +aimh,q w b* 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 and un* kfq;m+x/(0cts,2 zpoeslp niformly accelerating across the floor. The time and distance traveled from e;olmf sx0np+/2 pz (sq*,ktc 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 ca (qasn3p2-j+8/jm stg xfu ltgt-i8d 7r starting from rest and uniformly accelerating across the fl2sm8/a3gj q-i 8uj7 dn-stl+pttfx(goor. 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 uniformly accelerating ball. The position of the bal6fuut f 9z/g0cha9ao, l each second f09o/ca ,g9u6azfhtuis 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 *an qrauo1c2 5ball. The position of the ball eac a2*r1qna5ouch 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 mov9emf* nlno2r 8kzc-2 yhens30 ing in a straight line is shown in the graph belz s-e fho3yl082rcnn9 *ken2m ow.
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 on a unicycle movmmwt0 / boiz81ing in a straight line is shown in01bzm/t o8 iwm 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 a vacuum n ld/0wz4zkv: 3w,hzb4(sfxg jear 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 accompany9wpx(malhp3dg) :w hp q7 q10ving graph describes the motion of a marble on a table top for 10 seconds. For which time interval(s) q9x)wmhhd:wp (7l0vaqp p13 gdid the marble 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 describes the molo um46u nj2 x*/nk/gu6n mwq3tion of a marble on a table top for 10 seconds. For which time interval(s) did the marble have a positiveu2/u 3gx*6m q/k wmjn uno6ln4 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.auqztv3 ,io .o;psi :n9a3 ms graph describes the motion of a marble on a table top for 10 seconds. What is the marblsp;3qitv :on, ..smzio3 u9aaes 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 rest for a t0lbwdgz 9n1yp 1 2b:s1v(a upo4amdy.ime 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( 1sjo(/6q.vaeri8*o nz*w 0 pm 1ttygj jp*crraight 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 h6m*ulel qdvow4/7 ,zfollowing graphs could correctly represent the motion of an objw,ld*47m uv zlqhe/6oect moving with a constant 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 accompanying graph describes the motion of a toy car acrwly8 5g92c(gn d.fv kmoss the floor for 10 seconds. What is the acceleration of thewg5 .fvm2n9 d 8gcylk( 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 a toy car across y 3+lww3a-ssbnmnl un 9r5:8pm)id . vthe floor for 10 seconds. What was the total displacement of the toy car for the entire 10 second interval showldm8nn:ni 5l3. u+ryawb)sm-3svp w9n?


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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.26:The accompanyi 3snn5f13ppb gx6cmd9ng graph describes the motion of a toy car across the floor for 10 seconds. At what times or time intervn 9mxb1d53p6gp scfn3als 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 from 0 km/hr9 u3 2oyd9bmqjrvo-x* to 60 km/hr in 4.50 s. Which one of the following choices best represents the acceleratio3 dxu* 2mv-rq9 jbo9yon 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 shown. Which o;1blzehv8s8 jqx /4oaln,9kof the following statements regarding its motion is NOT CORRECT h e4ol98/n,az1kxlo s;vq8bj ?


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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 thdjqms rxz,p2)n j 42gd0b dg9n.6j7koe x-axis according to the velocity versus time curve shown to the right. When does the car have zero accelerati6j4xk.rmjjb0sd7 9n dd)zg po 2 ,g2nqon?


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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 inter8ym q+bjg5z9dc5 x 3etval of time, a tennis ball is moved so that the angle between the velocity and the acceleration of the ball is kepqtbxce 9y8gd5zj +3 5mt 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 are 150b,6k j op/ej,uq5jlb0 kilometers apart and traveling toward each other./bj j5 eu,6,lpo jq0kb
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(w a79a 2sfme6asaw 4w x-axis. When the acceleration is positive and increassamf27a 6w4w(wa9a e sing

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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 velocity isgi. agxovx3.s o9vi,8

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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 choices ide5mvf4n;+xw)i 4ozzh e ntifies quantities thamioz 4)v+z4x w5fe;h nt 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 moveu+ y; z2s5( nr.+ew6zqljo uexs $3.0\;m$ 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- uw. 0ccri0i ae7kzd(:qjw ajk)* .j8ytime, $y\;vs\;t$, 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 along9tuii)qo q .n. a one-dimensional track for total time T i qu q.in)io9t.n 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 othn9l 0j5unt .pdnj0x 0u5 v9 +.wdjdmotion of a car on a straight track is shown in the diagram. The upnt5nlwunj5d0 o09 t0 d.+jjh.x9vd thick 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 graps:/zrh1x4.anaw- nacnnu 7) u-8t /xj en(wnsh for the motion of a car on a straight track is shown in the diagram. The thi wzcn xne-st a1u- s/u./)n7 x4a wan:nhn8rj(ck line represents 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 motionfy7nr) ar,hkx* ;s.1nmuf.ai of an object given by the position vs. time graph shown. Fh r*, finxaa)n7fr;k .u1m .syor 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 given1n 00w4zjv-b2ywvm g o by the velocity vs. time graph shown. For which time(s) is the acceleratiow4 -v1oym bz 2wvj00gnn 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 th5yx *2+gycmhhx)esl p3.s j3be area under the acceleration vs. time graph for a fixed time interval of+y hsx5)s2m h 3*by. xp3jecgl 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 horizonibmx*l*sq(3d tal 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 tri f:mpdy 8hjfu k68-*ycbg8a(k/ wk4n jp in 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 and reaches the ground in a tim hcc 7:.s08v qxm:lan g:os6 t8ohpe8de 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 dx p)fy ho44;pv9,:wph lk0uea 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 m*)x8 gj-)bqroo zc.p graph of a particle moving along a horizontal axis is shown. What is the total diso*qm .zx- r))cgoj b8ptance 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 identifiexu3;daszjne 296uov4 a)8bc z1 pz hp,s all of the listed situations for which there is a non-zero acceler zzo 86d4x2vnc) a9 bu1hu,jp3asez;pation?
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 object moving along a line is - +ep t-j(ldxtshown. The object starts from rest at timtx (--e+jtlpd e 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 the origin asvtg k4;aw.zfif)k 0 7crk )c4nd its velocity along a line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of time for wv4 tf k.)i) fr0k7ga;ks zc4cwhich 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 with constanr+:8c4gy: .m bviiutkt acceleration. At an instant of time, the i: bt8vuirk :i mcgy+4.nformation 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 positio w r1o h9npj4aa0 hunaqqav x4)6c+/0en $x$, 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 grap3a1sfbmz k97z2sh e3zh, which one of the following choices correctlf z 1zksm7heb23saz3 9y describes the relationship 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, ax8g*(.usk/v q grjvr h0 c3)fvt which the car and truck travel witghv./3 rvj 8k*svfx0u)gqcr(h 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 wq-4hmw z* ,r klzc6gupe+s74origin and will move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the following choices correcq6 l 7r*+u4, czwwe-hmzgp4kstly 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 z1e 5qgh,thq l9u)eqa(7q7 r agraph of an object moving on a horizontal line is show,q(qe lehz t7u)a19qq rgh 57an. 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 the position vs. time graphc7 g a2ev upf0)-4k+b uryw0qh provided. During what time interval(s) doesw4u2q 0 )0kvuec a h-bpg+fry7 the mass have zero acceleration?


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