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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 aro tuij8x2w8m2mh r1 g7gund 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 eb9pj91j(ye ktone/ 7unit time without reference to a particular direction is (o9bete1n /7 k9eyjjp 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 tra eyo0,+bx1rpeck at an average speed of 50 m/s and then completes a second lap at an aveoy+br0xep1, erage speed of $V$. The average speed of the vehicle for the completion of both laps was 80 m/s. What was the average speed $V$ of the second lap?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  95.03: A toy car moves 0.80 m in 1.0 s at the constant velocity. If it cont4keggs 3kys/gj/ao ))inues, how far will it trg)gj43/kso k/)ga s yeavel 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 slidisi+a)a*:v ay.mcm ;iodq 6v8 wng 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 ofv+:i a a qav 6.sm8yicw*)dmo; 4.00 m/s to the left, relative to the plank. What is the speed of the plank relative to the pond now?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.18: A motorist travels 400 km at 80 kq iyl aocv7l*vj))..s m/h and 400 km at 100 km/h. What is the average speed of the motorist o)la)i vlvoj.*sqyc7. n this trip?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.20: This question refers to the motion of a toy car travelimp9*v 9nfmc 8fng along the x-axis.mm9n8*f vp9f c The graph shown below is a plot of the car’s velocity in the x direction, $v_x$ versus time $t$.
During what time interval was the car moving towards its initial position at constant velocity?


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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.21: This question refers to the motion of a toy car travelinbq4uyv;q2jy*o,4a z k 1:y lrvg along the x-axis. za; *v4u2q y4yyro q,j1l:vbkThe graph shown 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 tlsj jj .bxeh;yre6ye* :+a*0r oy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity bj ye;j6. e+h0*rx:j*easy rlin 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 vs. time of a ducgf ;rt,ykh)rxgfc5 g1hc68am.5d+ c+vct+uj k flying due south for the winter. At what point did the duck stop itmc+5,utc+x; ygk)d5f+1h avcrjgth6fc.rg8s 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 belopwyahg *6q i /1qy693,p scrlgw which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the average velocip/ swy 6h 963qgi,rq*galy cp1ty 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 andkh)ppdq*k k1,/tmrlo0ng+h/ ftg); k elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acpk +gk,)rk/pt* ;0) qhlhogntm1kf/dceleration 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 tzpl13bvv 8vfl.9b f2r ime graph for an object with the position time graph shown in thevvz3.fv81bp9b r l2 lf 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 refer to the following information. An ideawn p+efek 3q9g-w g60tl elasticf3e +e-wkq6 wg09g tnp rubber 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 tp/c5*)zhc w heo the following information. An ideal elasticch c/5ehpwz *) rubber 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 cank)qv9 dc3sk u+ 2sa wrq10t8 q(xt1gqy travel with a speed of $v$ in still water, which of the following trips will take the least amount of time.

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.01: The question refers to the followib9( wt0prq4zv88axm eu y. xp*ng 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 tptj,, i.b3xvy he 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 followingx w27u f4qq;ke 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 rep0w igoyn;j3 m*jj* 3hfers 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.
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 downs(q-kca0*tvs.ku h9:s2 5zzzz osl1i a ramp, across a horizontal table top and off the table edge. Which of the following would best represent a graph of tkzc*vi-luszk st z2 so 51q0.hz(9a s:he 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 fn1eaa,;tu0nhhu/f5d b1 m +qthe relationship between distance and time for an object that is moving along a straight line. What i,fa1 q/ h0+h 5dea;u1fnbtmnus 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 represen7ya9p,ppl -bodf cm 3z)ry*d ,f; bk001xt cdnts the relationship between distance and time for an object thpmfo-pf 3 d0yc0;7tp y,k*,b)n9x1c bdrla z dat is moving along a straight line. Between what times did the object have a non-zero acceleration?


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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.07: A small object is thrown straight dowkvoxpd-f 7sg wd/r/:8mm;;hx nward on Earth with an initial speed of 12.0g-vk;mf do/ ;r sw8xdhp/7 xm: m/s from a position 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 belowtlra 38 n7qpd: represents a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown in the d:38tq7p nlrdaiagram.
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 uniformp; zg4v/0 (qkxpb1epily accelerating across the floor. The time and distancvigq1e p0(zbp;/p x4ke 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 fromk; ()f*qsq:td8k fk2i5alq3gux v.oi rest and uniformly accelerating across the floor. The time and distance traveled from the stk)qao. xg(t q qdi8l5vi*3kkf; u 2sf:art 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 accelevj++)qg5g g9pm hag 6e(q q0qprating ball. The position of the ball each second is indicg+qj0)6+ ep9g5gvqhpgm q a( qated.
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 aahd)p8+gb.e s5 nozg-ccelerating ball. The position of the ball each second is indicate)dp.ehgs 8zan ob-5+gd.
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 stvzsg-yxx0- rp p n8u7:raight line is shown inzp78gyrx0- nvsp :x-u 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 clnq/5 dwjpq 1ax ls(em9 ni4/z:own on a unicycle moving in a straight line is show9q/wzsdmxn14/j p a en (:lq5in 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 fallq5bi0z;gv +f rs freely in a vacuum near the surface of the earth

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.11: The accompanying graph describes the motion of a marble on a table t:ux 0bzbj knml1wsgf.++dx11op for 10 seconds. For which time interval(s) di0xs+jw.gb1 +n k:m 1zbufd1 xld 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 desc yn3l1iw6,kj cribes the motion of a marble on a table top for 10 seconds. For which time interval(s) did the marble have a posjnlc1, kiy3w6itive 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 marb4,a*jc mv 69mbnpxrlrj,) yrj 3c; -,rgyle 7lle on a table top for 10 seconds. What is r, *; b7jav yr-34xejp,y6c ln9jmclrm, )lgrthe 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 unifork 2ms1gg3,fk.: reugxmly from 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 ofv1wf lm p68)kv $20.0\;m/s$, 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 repres*a7s-j:cta+qr)qgkbi g s6 h.ent the motion of an object moving with a constant speed in a straic +ts:g) shjg6 rq-7k aqi.ab*ght 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 across .x- 0*6jfs*s 5o4az3vtlr, da3l map7wdh cgtthe floor ft,p3tx 0fjs4ca 7.g* davh lz-5d3amrwlos* 6or 10 seconds. What is the acceleration of the toy car at t = 4 s?


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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.25:The accompanying graph describes the motiobkn s9c9q-8cg n of a toy car across the floor for 10 bc8- 9qk9sncgseconds. What was the total 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 descrqv7fd,jj3 9no 5qk6wo2yf t/qibes the motion of a toy car across the floor for 10 seconds. At what times or time intervals must th6oy5kfdwtj2qvqf 7,9njq 3 o/e 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 uniforg3uvw.ku. + irmly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best represents the acceleration of the cau grikv.w3+u. r?

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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 54,r4djh m9ohpozo21kq2 in aversus time curve shown. Which of the following statements regarding its motion is NOT CORRz n2o1hd24 5,jior9pkq m o4ahECT?


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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 theh6/h qme )13 eibj4ntl x-axis according to the velocity versus time curve shown to the right. When does the car haq hnl4/t ) jieb16e3hmve 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:6ss h dxr9 .jydlg-hvo 4h07p moved so that the angle between the velocity and the acceled0 s6lyhx-v974hpo hs d:r jg.ration of the ball is kept at a constant 120 degree. Which statement is true about the tennis ball during this interval of time?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.03: Two automobiles are 150 kilometers apart and travex;f2 fu 9c8w uhaj+2jahs,r(t ling toward each other.tfu haj;(8+92sfja u2w,hcr x
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. W7y xl2 h5+njd(pixuf4hen the acceleration is positive and incrlpi52+xn 7 hfx j4dy(ueasing

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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 averat0m /ffr wik0b e9x)3jge 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 one8rvr;t:d qq3o z27w rs of the following choices identifies quantities that must hartr23oq;8 w :srqdvz7ve 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 move49i6f cx*j asl cw*uh64 we7ggs $3.0\;m$ 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-tio 6z;3d d+ob5lej+r+w bq wu7ime, $y\;vs\;t$, graph for the motion of an object is shown. What would be a reasonable equation for the acceleration that would account for this motion?


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.31: A car moves to the right along a one e )g5t9zlmi ;8(gwakn-dimensional track for total time T in ing8metg5la ( z;9kw)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 tra58o (,jzfjnyu ck is shown in the diagram. The thiz (jjuf8n5y o,ck 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 grabhbp2h-uf,2q*,8xlbaf (ytlph for the motion of a car on a straight track is shown in the f 2xyhh,8tbaf,* b-lpbu l(2qdiagram. The thick 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 motion of anjr3 ,vvk oefreoom x::/k.a:7 object given by the position vs. time graph shown. For what time(s) is the speed of the object great e vo7f. a:mk3r/xjoker ov::,est?


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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.11: Consider the motion of an object given by the veloczai2e4p/ jx i01-cqe sity vs. time graph shown. For which time(s) is the acceleration of the objejeac/ spexzi 4- q1i20ct 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 vgjn+cjt)w qsa(5q+3 iba /j8area under the acceleration vs. time graph for a fixed time intcbj8vn / ig3sq j)t +(aja+w5qerval 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 horizontal line with increasing speeda set*4epo9+fc(tvqixni/4kw j9 z1(.
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 parts:bllqfmsbcd b: b:gyu1,*.) j ec(,0 cr
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 groundjup7;.g qj ya1 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 r*d;fg +yl :isrest and reaches 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. time graph ou6 emw11cee5 p mrmbbkz7:+1nf a particle moving along a horizontal axis is shown. What is the total distance traveled by the particm ee5bunz+: 1re 71p 1cmw6bkmle 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 fol .hxa4hmi xx/e5v)cw)y7t*b zlowing choices correctly identifies all of the listed situations for which there is xx) ytv/h4z*)7iew. bmhxa5c a non-zero acceleration?
Situation I : A point object moves in a straight line with increasing speed.
Situation II : A point object moves in a circular path with constant speed.
Situation III: A point objects moves in a circular path with decreasing speed.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.32: An acceleration vs. time graph for an object moving along a line is fmp+tf 9jc67 fshown. The object starts from rest at time t=0 s. At what time(s) does the object attain a maximum displacement from its starting potfcf 7fm 6pj9+sition?


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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.17: An object starts at the origin and its velocity along a line4 xrxc g9 7lxe9z0to3una (2ck vs. time is graphed. Which one of the following choices be9o c xr xz9xugl73( ca42net0kst gives the proper interval(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 0c pyny5;squ** 7z fekto the right on a horizontal track, each with constant asy0* n e 5cuqzf7*;kypcceleration. 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 position5g ur a4:br;kw2-*d,/ u wquh/ar)ssl.kp yoh $x$, 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 ofk .- ,ar6trb b xsto)6p.5mtlh the following choices correctly describes the relationship be. rbaxh6l s r,ptkobm-5).tt 6tween 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 followijdcdepcq g95-xv;3 km k* ;ip*ng choices best describes the instants of time, a*cdppmx9k; ievqc5 dj *-g3;k t which the car and truck travel with the same speed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.30: Two cars P and Q, zmsr;augl rhf*69bm: ;c/) nreach start from rest at the origin and will move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the following choices correctly identifies *n6 ;fsl; r9r zhg)au:r/mc bmthe 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. timj 7i44uw*v c:n mhsad7e graph of an object moving on a horizontal line is shown. At what time(s) is the object moving witn adhic4 jv4w7*7m:us h 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-axii +(irh 28p+ w(j,pd fjpbwql:s following the position vs. time graph provided. During what time interval(s) does the mass have zero acceleration8pi(2+d wlb,hj q+rpij(:f pw?


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