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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 around a cirhrs s khz*17ehkp5 c 3;lu) -as;7sfiscular 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 7nc 6p hpl+e)etime without reference to a particular direcn)7c+ e lpe6hption 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 averageny5ndcm1cckig8i 4vjl.a c1 l -l *1b:ua8n*v speed of m 1*u cl nl kn dvyn15ivg: .*ccal-j41icb88a50 m/s and then completes 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 *u b9(k*vw,(dcsquli velocity. If it continues, how far will it travel in 3uqvd *k wc*9,(lu(bsi.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 irpa48topn ;/ 30-kg plank 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 m/s to the left, piapr/8;otn4 relative to the plank. What is the speed of the plank relative to the pond now?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.18: A motorist travels 400 km at 80 km/h and 400 km at 100 kdtyec alge:ls69+c7w.p1e +b n-z6edm/h. What is the average speed of the motorist on this tr:.ate1egz+ypd6bce 6cl9 n -dews+7l ip?

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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 j18 :tx l*+5hy3c5 ztebjppuztraveling along the x-axis. The z 5j8bt*yj:el1u tzxch3 p5+pgraph 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 tq7jj18x* i3 .,kboufh7ebayr o the motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the x direction,7ubja1 hxbfk,87y ire.*o qj 3 $v_x$ 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 alon,*l* ) nbnzc++tk nt(upd w/awg the x-axis. The graph shzw( +tlu* dpan/ tw,*n bn+k)cown below is a plot of the car’s velocity in 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 vsh)dtsa 8z. 3zs. time of a duck flying due south for the winter. At what point did the duck stop its forward motion )st.d 3h8sazz?





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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 2mxi:5bm fg6z below which shows the position and elapsed time of a car starting from res 6x:gb5imzm2ft 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 lspe f9-oao*frt,d p1 d- r5q/diagram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleration dse5rro9 ,o *qf lp/daf1pd-t-uring 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 objecn c9say cf-,.rg9lub+t with the position time graph shown in the dia-l9gu.bs9a +cyr n f,cgram 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 refer to the following 2bl.jvkxv 1x: information. An ideal elastic rubberxv.2 vljx bk1: ball 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 question refer to the following in )wtgzujo/p)5t :lbfh+m)q q (formation. An ideal elastic rubtgqtq)u)(+mp) w 5 ojfl: b/zhber ball is dropped from a height of about 2 meters, 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 travel wit vm92c uscd1,sh 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 refv/ n, vpfgoo:(mq8 e5gers 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 t tnyp)7vhjhml*t ph -. bu0 tdy6w878hhe 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 followingah(s( r fqdg.io:8n: 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 th2xk xq fpqqd kg3fdz6t.lfl)-:d15f0e 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 table top a ,(h7ntd f-lvkjvhb:4p0a t9x * d;cbmnd off the,tm:nbk c *(v 4fjapbl79 ;d- txhd0vh table edge. Which of the 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 relato)ha*6f- / veq/bd7i/ievmlz ionship between distance and time for an object that is moving along a straight line. What is the instantaneous speed of the object at a oi*7vemv// id6)bf e/zq-lht = 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 time fortu3i4r;kb (ws,2 adl x an object that is moving along a straight line. Betwxbatr3dk s(w,2l ;i u4een 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 straigh; z;z)5rd xwsd)ury 2ct downward on 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 the dydz) x;z2s w5)cu;rr 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 s)p* f :weey(dzx(c8kz6ry 5gtoy car starting from rest and uniformly accelerating across the floor. The time and disdx6 ygsr:5ezz p w)f( (*cyek8tance traveled from the start are shown in the diagram.
What was the average speed of the cart between 0.1 seconds and 0.3 seconds?


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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.12: The diagram below represents a toy car starting fromc51rm g+l.e qk rest and uniformly accelerating across the floor. The t.rmgql e+5kc1 ime 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 starting from rest and uniformly abx9ss+ -ch8p. txk zo b3mr(p5ccelerating across the floor. The time and distance traveled from the start are shown8xr cp.bom z-35+(stk sb9xph 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 position0n4zdeqjlz-f*grit): 8 8x 3qhx*b hk of the ball each second tf*-zld n*: rx 8xqg)eqbh 3i8jh0kz4 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 awril)69 a,czg iase.; ccelerating ball. The position of the ball each second is indicatarecswa,ii ; l)z69.ged.
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 movinz7;uv 3f wqq6kmkl9q 4g in a straight line is shown in the g qmwq3u v9f kl64q7;kzraph 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 straig; xitah. 8z9rght line is s r;gzit98hxa. hown 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 a va/xk5m,yrqo2ge vdrd648zt k 6cuum near the surface of the earth

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.11: The accompanying graph describes the motion of a marble on a table top f95w )xz hyvtf4or 10 seconds. For which time interval(s) did the marble have a negative vel f) vhxzt4w9y5ocity?


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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 oong -d 9;,86xv vwlv5ril/laaf a marble on a table top for 1xado6 v5;lvi 8,gl nla-wv9 r/0 seconds. For which time interval(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 graph describes the motion of a marble on a tabq3)zj b7 )ahw20k, j 3qcdbvg0wm4vkyle top for 10 seconds. What is the marbles average acceleration between t = 3.3 s and t = 34vad) m3w3cbq b7kq0vj)j 2hg , 0wkyz.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 frox ro- eyk(0ktt4xj c(,m rest 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 speed of 0vj4c6p h/b5p10bu-v y roxb6(cgbgy $20.0\;m/s$, 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 followiz9;kf*kp w v7ing graphs could correctly represent the motion of an object moving with a cop*w 7 ifzvk9k;nstant 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 the0s k)cque85dufis6 g ,4r t6xx motion of a toy car across the floor for 10 seconds. What is the acceleration of the toy car at t = 4 s5) ,8 g60tde i q6x4uksxrfcus?


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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 c*o 9konf 6qisx8c qh44ar across the floor for 10 seconds. What was the total displacement of the toy car for the entire 10 second intervfio h9*x4qn 6q4oc8ksal 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 of te;/ cn 894gfda( rqcbsej+7a zu9l g1a toy car across the floor for 10 seconds. At what times or time intervals must the net 99t guebdanf /zlsc; rea(q871 4j g+cforce 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 t:0a9c gjxov8qo 60 km/hr in 4.50 s. Which one of the following choices best represents th9v0c q8:jx gaoe 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 fo vvgwmckl z+9pz 37l:9llowing statements rm9kw p c93 zv7:vgz+llegarding 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 movestflg19 4;83b,rmdzt kh)f3y goq;dgv along the x-axis according to the velocity versus time curve shown to the right. When does the car hav3 d,obdl8z;g m gkg 1qhfr)t;3t49yfve 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 angle betwk p.j i6w7 g cuyztuxk87ca5z) r/8u8yeen the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true about t ty587cu p7j z6)rkcu8gz8/awy ux.i khe 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 anb*8y41ud/:rinz qpc1efq ra6 d traveling toward each other.y p161uq nbfqa8 4zi/rrdce: *
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 i zydw i57l9fu7f+a -1qdcg:vvs positive and increa917z5d+- yucvv:ql ffwdig7 asing

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.12: The definitio64aj w4 y: zjzuf ::jc3aws*v:xl m8dun of 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 fojw6 *m+sb nt8nig oi+.llowing choices identifies quantities that must have the saj8.ni6t++bin*g smowme 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 movesedu:3t z( 4ong $3.0\;m$ 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-0ymw1 4 (gogdmtime, $y\;vs\;t$, 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 alogakq,c; vd1b7 ng a one-dimensional track for total time T in1 cdbv;ka7gq , 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 motion of a car on a straight track ipfkf-+ 8vs i+bec9ca(j*2ma ss shown in the diagram. The thick line represents the velocity. Assume that the car starjp+mcsc8 k 2va9(e -ibfs *+afts 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 motio;b3 h5imf( dcon of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that the car starts at or(;3hic5b omdf igin $x=0$. 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 given by the position vs. time graph xruuk xhp 3*m48hp2 8 ,q2d(k:mellrbshown. For what time(s) is th brm8k8 h2uk p4ru *2eqm3p lxxld:,h(e 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 giv c m8:0mcm4zm,i 8ktoyen by the velocity vs. time graph shown. Fmo08y8m k:ic4, mmtczor which time(s) is the acceleration of the object equal to 0?


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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.24: By computing the area under the acceleration vs. t+oyztkh5n ps.awn:85rdw1 k/ ime graph for a fixed time intertpzwo .hk: d5y 85/k awrs+nn1val of an object’s motion, what quantity has been determined for that object?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.08: An object moves along a horizoen+z* /na fl:*dnquk5ntal 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 in two par/qtm.e 3 t3m98k)wdjwj j/cyx ts:
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 an 2; h wxw:p bygzfjvlrp*l08mf,.z6o6d 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 reachd-yr:.xige. (et + lh4 0s)hm; kdauzyes the ground in a time of $2.50\;s$. Neglect air resistance. From what height above the ground was the object released?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.17: A position vs. 7)q(th xr1prttime graph of a particle moving along a horizontal axis is shown. What is the total distance traveled by the particle fro x7t)rp1qht(rm 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 correctlyu70t3 c(vjp u tp. r+sc1h9ozx identifies all of the listed situations for which there is a non-zero apc30p u t1x u 7(o+jhv9tzrc.scceleration?
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 mov*qdb 1cc(;nfi ing along a line is shown. The object starts from rest at time t=0 cdb;cn (*q1 ifs. 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, ;::a(adu ie9 yrqdvu the 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 f qyed,9a uidru ;(:av:or 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 mov,n.t;3;or :wmc +0 szguunupxing to the right on a horizontal track, each with constant acceleration. At an instant of tis ;mr. pc:0, x3w+uuntn;zuo gme, 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 positkw cy) yk40:ovion $x$, 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 n yq7:ecczh6f 9w u0l;graph, which one of the following choices correctly describes the relatiow 79hc ful0ycezq :;6nnship 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 des;z6bd +ceq2x 7/ar qoucribes the instants of time, at which the car and truck travel with the same sqz;x/2bq 76ecou+adrpeed?

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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 tsu nee36zr /c)2*msnwhe origin and will move along the x-axis. The emcnu6z2*/we3)ns r sacceleration 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 offv4h27j9;o fl3k f r9m;tu 1ls5hpwmn a horizontal line is shown. At what time(s) is the object moving wijlft 97lh p1mr skw3fo4hmu; 9ff2v; 5th 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 prf)e8yw r iu o*t*w;p(aovided. During what time interval(s) does the w *y* t;(pw)aeur8ofi mass have zero acceleration?


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