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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 around a circular su: . /iv:mlc4ayti;b, j, gnjpath 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 tw*z 9 8t(35fkd*gk o--gaasvxvauls5-g lbw)ime without reference to a particular direction is w8df5 u-gk*5zg t)(ks-l -l3aa9 ba xvvg*wsocalled

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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 ave8cwy,h 6l7n bsaokl :9rage speed of 50 m/s and then completes a second lap at an average speed ,7lbn9hky 8c6o:swa lof $V$. 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 inwru(hnqky5cx*(i7 m , 1.0 s at the constant velocity. If it continues, how far will im(xqkhir57 yw*,u(nct 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 wvq2gr*q 4ncpx - l qt1,+uvb8that is sliding at 5.00 m/s 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 plank. What is the speed of the plank relative to the po2vqv4u,1q lt*gp+ x8n rc-qwbnd 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 80m;ktma bn rik 00m-/3mtihcu3 sf(,h- km/h and 400 km at 100 km/h. What is the averagem3t,tib u c3(rhfh nim sk-ma00m-/ k; 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 a toy cce7p zy.,p x1oejxt0j+w ei90ar traveling along the x-axis. The gra eczt 0pjp +iewo0ej9,1x.x7 yph 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 qzzc:y)bm a1- x-axis. The graph shown below is a plot of the car’s velocia qz bm-1zcy:)ty 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 mo 21o twpeyt.9-c 3skpktion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity t3 tp1. ekop kws2c-9yin the 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* 24jwz)gevz7rjkl5 wg*9f lb vs. time of a duck flying due south for the winter. At what p g* wegkf)*9 wvrj4jzlzb 725loint 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 shows the posit nod;4(uewok4 d-xz c:ion and elapsed time of a car;oc- xwkd4zun d(:oe4 starting from rest and uniformly accelerating in a straight 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 diagram below which shows the position hic w y0ist*:ny44)m)pv6i4qcch4quand elapsed time of a car starting from rest and uniformly acceleratinsw4 )c4qi4c4hqiyih:c)*0y6mu v n tp g 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 object with 56 we7srpp ou,,5oqro the position time graph shown in the diagram at rig5qprrso,5 uow p6eo 7,ht?


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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 followi6s qf,1bry zn c*39spcng information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its origicq,*rz1pb3yssn f 69c nal 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 qw. jq7l/alzi; va,v3g uestion refer to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, valw 7 / z;g3av.q,lijhits 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 with a speed of j n9lo; +ncq:d$v$ 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 t;5dlrukad;t 4- .q t/nls +atyhe 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 refuwy*g1t7j :m w c+hi0aers 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 refers to the followin i4at8s+gqnm /g 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 mtw p:y/g5)hq 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 down a ramp, across a horizontal tb 2twu/p2g)uzx 6g7ntable top and off the table edge. Which of the follow6w ztb p/ng)2 7tguu2xing 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 jdehe2 .(f( y/)b w34d4b nxkhfmlcj9between distance and time for an object that is moving along a straight line. What is the instantaneous speed of the ojhy)( 3mfbj9f4hk 4 ne/2.lcxde wb( dbject 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 kq( + msg*r7/5lhzovzo 20o awdistance and time for an object that is moving along a straight line. Between what twr+ /s (7hk0az*z2omqv 5ogo limes 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 on Earth with an initial speung*;/ or6 g/3fynrwv ed of 12.0 m/s from a position n/ wung36rf or; vyg*/10.0 m above the ground. 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 h q8iuustgs678ba )s rid+xl (2rm05ufrom rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown+ 0)8g56 urxu27s sbui( 8tirshm aqdl 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 startiapgmbvto jon+ fb jyid bi80w5//* ,/.ng from rest and uniformly accelerating across the floor. The time y m/ *wpdiab.obf8tg+nv0, //j5ojb i 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 below represents a toy car starti);6 wwslji:wvng from rest and uniformly accelerating acrovww)jlw :is6;ss 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 uniformly accelerating ball.3 j-lr+ d/zl j4pm.:yi/navmuv1yjt7 The position of the ball each second is indicate.4-u3vynazyj7v :d+mljrml//j1 pti d.
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 positiow9m/ t 1xei,r7.zm ttxn of the ball eactx71.z ximemt,t9/r wh 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 straight liak, dr:dd9xd 2wqr3 k2ne is shown in thed:2ka9 dd2kr,d rx3wq graph 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 on a unicycle moving in a straight line iabgl,2/v5-zknu5xn5 ufrj+r 4qh 7e t s shown in the graphl+f5uzrxj -7t5n2k/,u qv4r hgae5n b 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 near the surface 8hzfzf:g- br0 sb)vwn 1p/bsm-q1 u r3of 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 f k a7.zxo an1ui9hd2se 4w8*nmotion of a marble on a table top for 10 seconds. For which timone u2a*f4i x khzwsdan18.97e interval(s) did 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 motion of a marble on -9wmbst cp,,8 xo8wtqa table top for 10 seconds. For which time interval(s) did the marble havebqt 9 8-pm,cs8,ow xtw 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 graph describes the motion of a marble on a table to *ohp0u x2rr3yjxh0*d k7+lukp for 10 second hrk k0lrx*7oh+3p j* xd20uyus. 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 restgv s-h pm9if+j k(g1 f,w;os1w 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 straight downward with a ao()3 ab :yt+u rxtfk4speed 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 folllt 6cfez90 he22mlape; o4/ipowing graphs could correctly represent the motion of an object moving with a constant mhz4 e; i2/f l9pl2pe6oac0et 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 acra4 wh/s(1 njdposs the floor for 10 seconds. What is the acceleration of the toy car at t = 4 s? jha 1/(w4dnp 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 4akx97xm. 45vo1ienstonv(etoy car across the floor for 10 seconds. What was the tota(ooievvm n44.5exat s17 9kxnl displacement 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 describaldijd z2 p3p4rd8 99ies the motion of a toy car across the floor for 10 seconds. At what times or time i8 pzjdpd99a43r l di2intervals 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/hr to 60 km/hr in 4.5flfjpbj1ta 8 :jcj )+90 s. Which one of the following choices best reprjaft19fj ) c j:b+8pljesents the acceleration 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 of the ee l/-;st8 omhfollowing statements regarding its motion is oehl me8ts/;-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 according tem5i m;)y2-uka n a0aco the velocity versus time curve shown t;n uia2mamc5a0eky- ) o 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 intervalsq/m/f*w1 gef7fe2 oxr .u.7 k1juufa of time, a tennis ball is moved so that the angle between the velocity and the acceleration of the ball 2fe.rux1*71 w7f u/mqfg o.s euk jfa/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 are 150 kilometers apart7b qie 1*jpw2s and traveling toward each other.wp1i72 bj *sqe
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 pf5 +:h2o b+tqqz hs8qrositive and incshq2+hbo85 qrt fz:q +reasing

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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 avera u2q9b7vjjgx; ge 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 v g 1bmhjompiq;rk/,n 7u1d +/the following choices identifies quantities that must have the same direction?kb 7qi,du1mg/p;v mro1 jnh /+

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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 moves 7k).tbs)ci/2u swo ec n b 88ken+hxu8$3.0\;m$ 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, wxcsc8,a0c2 +md gntsl1v 8 h9$y\;vs\;t$, 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 zo4p+v vu7zu52beg0n: i-etf along a one-dimensional track for total time T in two parts gz7oe2vfu+5 nu-z 0 pv:4bite.
• 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 l5 seho1(/j5hba/ebgon of a car on a straight track is shown in the diagram. ahb (1bohg sl /eje5/5The 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 graph for the motion of a car on ao ll ;x2/4pii*kmlv*a straight track is shown in the diagram. The thick line represents the velocity. Assume tlom p4;/ivl2* lixa*khat 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 object givf3,l tqpf1*zm en by the position vs. time graph shown. For what time(s) is the speed of the obp fqmf,z*lt31ject 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 th0xn 4;)(s:v5xweiz ,xsbbg uoe velocity vs. time graph shown. For which time(s) is the acceleration of the object e:)b4wn,xs0bu(ose g z5iv x;xqual 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 vd(:w g+kfxs rh.9lxs.z6e4as s. time graph for a fixed time interval of an object’s motion, what quantity has been det9zl+6x ekh(4. :swga sr.xsdf ermined 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 with incrpvi73n;o 1atv fz 1-vr(ta;oi easing 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 in two; p1jkb(*x enz 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 t, pwtg- .dx+budk2 b l6qay9b;he 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 tui(y+2h,ukz 84fmx ryime 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 grap18bsnuel ntdw 9o/5;s h of a particle moving along a horizontal axis is shown. What is the total distance dnbtos ;n 1lwu5s /e89traveled 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 choicest5z;:c bw*ml xz0ce9qms4nxuv* ha,5 correctly identifies all of the listed situations for which thereb* ahu:5m ;lvx45sn*w9ex0tq , zccz m 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 fora* 5ude va15l4ayjo+e an object moving along a line is shown. The object starts from rest at time t=0 s. At what time(s) does the object attain a maximum displacement from its starting positalu1oaed5a+ ej *5 v4yion?


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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 the1piew oicx7)0 origin and its velocity along a line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of time for which the object is moving a1)ci07ixepow way 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 07p c:dqcz f1d a91kygright on a horizontal track, each with constant aqcp z719 g0dy:akcd1fcceleration. 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 p wu9ougslh6t8w*v9 2xnb ip- :osition $x$, 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 graph, w77e6q wt-uwsi hich one of the following choices correctly describes the relationship between the average speed of the truck to that ofw qs-it77u e6w 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 folltvi67 os*a6 yzowing choices best describes the instants of time, at which the car and truck travel with the s*6a 6oszvy ti7ame 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 orig)*r;rvvw ej t)in and will move along the x-axi r)*jv r;tevw)s. The acceleration vs. time graph for each car is shown. Which one of the following 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 moving on a horizontal line isrcq(6),bd km j2+hvkyt l94nv2rt7 jgy2;gvi shown. At what time(s) is the obje 4,)vbtm;vg+29yyr tc gr kj272jl v(nqdhki6ct 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 followin 0dr s)/u 7yn;7b a zlen*vyjto.y*g4cg the position vs. time graph provided. During what time interval(s) does the mass have zero aczvs4r/ anlo.0db*e cj ygt77uyn*)y; celeration?


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