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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 au- gui3-5a cx,q 4vjtd constant speed around 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 ti7uk*ljikg3 6a,3ucf11 pwu h yme without reference to a particular direct17w k3uyg316lj u,af u*p khicion 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 circular track at an a9z p g*7 vxhrivch)mg6s.ua69verage speed of 50 m/s and then complete)9v9p6.h* h6gxrzi7 umvg s acs a second lap 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 veloc e( ydua9yox8h/h1tr1ity. If it continues, how far wilx1t r /yahyud9e18h( ol 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 plank9eh su:k;p6 ( g/h0fylv*5 w2iqowkzu that 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 60yshozwpk;2 /kwiuq 5e:v9gl *(u fhm/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 40rr.dug0c8h6 o60hg d6wri r)e o0k pe50 km at 100 km/h. What is the average speed of the motorist on this trip5er0 gr6ohe .0)ig p8c khdr0ow6d6ru?

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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 t)k x w*ry)ch5xhrsw 90z6kct0oy car traveling along the x-axis. The graph shkhwr5 rwy6z*scx)xtc0)k90h own 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 anl y/lq6e vze d3 hxzu)l4f5(*long the x-axis. The graph shown below is a plot of the car’s velz6x yf vll*ul/3e4 z hqn)d5e(ocity 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 toy car *,netquq )hh;traveling along the x-axis. The graph shown below is a plot of the car’s velocity in theuet hh; ,)qn*q 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-v 6fc875qf;smnkdgpgs1ln + vs. time of a duck flying due south for the winter. At what point 8 5n6ndfkmcf-;7ssl1g+qvgp 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 position and e+qkntae;4 0:(bz0c+cojo oywy k u0(glapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the average veloci ty4g(cq0cono; kw (ayub0j:o0kze+ +ty 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 ywe(oh hm*4f uer3*3z below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The a 33yw4eum f (zh*oreh*verage 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 shs h n3h/;*nha-ji3 r2ooic1chetx+mjym6k / ,ape of the velocity time graph for an object with the position time graph s eymi shx +,ht31ho m j/ia;jo/ nc-n*6h2rk3chown 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 rem3 . (lk5;yhwpxgc 4fnfer to the following information. An ideal elastic rubber ball is dropped frocx k hwy l3pmn4;f(.5gm 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 question refer to the following information. An idea.7, ar) 7ycng; l5di:hylkte pl elastic rubber ball is dropped from a height of about 2 meters, hitp ;ikny.h g7:r 5ye,)cadltl7s 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 wit bqmiokz83br 8(ft :x6h 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 following scenariezlzct ht/9 8s.me9ys. r 6:xfo: 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 tgv6ng97c7st1(4d3 1 wwt.jn:vzkndvot 9janhe 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 refe+eirg7,g lcb :rs 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 shm69y * a g:,f6mjmbxto 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 horizonta 0gozyzuv;fb g2a.:p)l table top and off the table edge. Which of the follpzo)b v z2:.0f ygua;gowing 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 bd p)v(d -wx.myetween distance and time for an object that is moving along a straight line. What wydvpm(.d )-xis 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 time0zv2*x)s xym y for an object that is moving along a straight line. Between what tisvxz *20yxym)mes 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 downwawdkd57l3 9qx1tox7jm pye3-b vl -rt: rd on Earth with an initial speed of 12.0 m/s from a position 10.pdq9:rj- we xk3v7ot31ll5 ty 7d-mb x0 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 from rest and unifor 0; ., 9kt2w kwedue6pfprefu4mly acc29 e kwk;pwr0ptue.df,ue 4f6elerating across 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 represents fcch68r4 ,) txkoos 9 4cd/ueaa toy car starting from rest and uniformly accelerating across the floor. The time anduo 4oc8)6s fcc9e/4 rt,akhxd 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 *t3d4l: xnxma toy car starting from rest and uniformly accelerating across the floor. The time and distance travetla:4x *3 dnmxled 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 accelerveia)hce/:3p4v wx twe z), 8f16gwhtating ball. The position of the ball each6/x4ce t)vh :, wg31fet)wi8 eapvzwh second 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. Thetc9 x z:6c 6pdyw)vb0j position of the ball each second tw6)ycp bjx9cdzv :06is 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 lsb0/, eae5vf7w.p:; saqwk egine is shown is5v/g e7pb afe.ks:; 0aw,eqwn the 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 unicyc5 -w m.ww 6zcz3yd3nrm01pgfule moving in a straight line is shown in the graph be rwg0myz-cu1w6d. w3fm5zp3 n low.
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 surfacpg9t p c48ryv;;yvfaax. i35e e 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 motion8:v( lll u1tfvmml-6r of a marble on a table top for 10 seconds. For which time interv8l vl1lftr-m l(:6muval(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 j 0k.fu ib+fm7on a table top for 10 seconds. For which time interval(s) did the marble hak7+ f0u fijm.bve 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 oknoq.f -l/r acjsai od14,;8y n a table top for 10 seconds. What is the marbles average accel;,1qaciy arj. /4s lfd 8-nkooeration 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 resp n/hy1e1)ap:ah(. l ovg7 dnwt 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 spe*4i*2zmz 0eh ew g. j1zte4) ftg(uvbced 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 represpu2 9zn0egx*fent the motion of an object moving wi n2fgex0p* 9zuth 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 accompanyimpx)ufo+ol m;ph.;eof1 7,g fng graph describes the motion of a toy car across the floor for 10 seconds. What is the acceleration of the toy car ofxl;7).oppmeh ufmfg ; o1, +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 moti22fy 1ds bhd/v gku0.la1 u9nqon of a toy car across the floor for 10 seconds. What was the total displacement of the 9ln01 shqkbd/yufg122v.u adtoy 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 descriohu. dqmzrcg9)25mo 9.,fh00 if oxdn bes the motion of a toy car across the floor for 10 seco d .)fzorhq5oxh0n d20ucm9gmo, .f9inds. At what times or time intervals 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 unifoyuuc*3- b )twzrmly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best represents the accelerationuy-cb3w zu)*t 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 vel8pm/3phlzw zv, /:qt pocity versus time curve shown. Which of the following statements regarding its motion is NOT CORRz,q 8p/h ptw v:3ml/zpECT?


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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 -amuwi dr b+8w+m,sja9r-9k.r u zy7athe x-axis according to the velocity versus time curve shown to the right. When does the car have zero accelera9r k7y.w -i wj+rm mzsdba +u9ura,8-ation?


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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 v aes *cry.q(7angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true about the7 .as*vc qry(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 150 kilometers apart 81:i* 7ekkdr(.amvajcq/ hvoand traveling toward each other.8v:akd /vei qo 7ram1j*.( kch
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 pcjzg f oiv/se.r1jq0/(t3/s c ositive and increasi c v /q3esoj//i(s rzf0.1gjctng

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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 ofvyc7 ;h3l )nbrka lwe30h-s r9 average 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 choices idefxc5t60yh9+ 8ut jcubntifies quantities that must have the same dire+th bccu 9y0 f85txj6uction?

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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 movesk c2nyfp8a akm((c 1,v $3.0\;m$ 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-timgvq k326;o jxie, $y\;vs\;t$, 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 alow 8gs(njy7; npng a one-dimensional track for total time T in two par;sp 8n( yjgw7nts.
• 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 moaztq) fmy-4q w2se9a.ny o4v) tion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that the ce.f)mzo9w tasyq) nv- qay4 42ar 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 graphl:;v8mh4j fv1aq6c yn for the motion of a car on a straight track is shown in the diagram. The thick line represents the velocity. A ly6hnqc:;8 aj4f1mvvssume 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 ,qfof oz 5t9dvi m jru8wd9,lgv x33lw:(i,q2 object given by the position vs. time graph shown. F( dfr2, w fmizg3 q3wj duq5 xioto,9v:l,v89lor 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 motionb 3)( xkytp9da.8h je 86g+s0wh*mm xfts ri/a of an object given by the velocity vs. time graph shown. For which time(s) is the akx.6h38yaa(xisr f t*gpm 9/db8we+jth) m 0 scceleration 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 the 7hr4y v1nujk*wv034rbcx- rc area under the acceleration vs. time graph for a fixed time interval of an yrk7v3 4rx vr* n10bcu-cw 4hjobject’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 with increq8r0m he7o *k rfj;(spsgp+8nasing 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 p- po-*bbwgk1darts:
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 inzk-q3wxpk z/d3w f2- l 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 timje j+i.rh/zs1ncn;6co ).zmbe 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 movi1k ca q6g+ x6bl79 o t.(pigmhla8kg6mng along a horizontal axis is shown. What is the total distance tra 19g66 qtga.7xm(lmikbpk o l6a8h gc+veled 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 correctlv d: 1,fragb6ty identifies all of the listed situations for which there is a non-zero accelerattf:1vrgab6d, ion?
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 objw*inz4kgt6o. y +- ydpect moving along a line is shown. The object starts fdgiyp*4.+n- ykwt6ozrom rest 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 the orighp+4:)nzkadsve0b 6mc81qw oin and its velocity along a line vs. time is graphed. Which one of the following choices best gives the proper int+shnz0vpbkad e81mq4w ) oc: 6erval(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 m bbc;;52hxn 8xni0rsa horizontal track, each with constant acceleration. At an instant of time, the inform5sm 8ni0bx;xcn 2hb;r ation 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 posd2w: lzacbpdp( h 0y1w15nvf9ition $x$, 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, which one of)..fj t*8znozbrt p9q/;h ykc the following choices correctly describes the relationship between the average speed of the truck toz*tqc/r.ktjo; 9 )b8p n.hz fy 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 t -zlpnb d6p:ac66 cpl-fq: /bjime, at which the car and truck travepnz:lbc6/ppl-6c 6 j:-bqf adl 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 will move along 68nnu ed( 6s1f nt kt4e-xu)sxthe x-axis. The ac8- uxkdfnenx6tt1)4s n6ues(celeration 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 f z 6meotto4l4, h3mn(luf dl/3wj :1khorizontal line is shown. At what time(s) is the object moving with its grl m f nwelt/46dfotjmo3 :zh,u l14(3keatest 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 alo0zi:zg e 3nqz/ng the x-axis following the position vs. time graph provided. During what time interval(s) does 3 gi ezqznz/:0the mass have zero acceleration?


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