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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 cixailfyw,j 2s* n(4sf 0 jwagd 9;.,5f.iydcq vrcular path of radius $R$, if the particle makes one complete trip around the entire circle, what is the magnitude of the displacement for this trip?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.01: The change of distance per unit time without refccggoash)zh) l 6.x1;erence to a particular direction is a;.g)xhhgc6so l)zc1called

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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 avera 07 +5slczvtq.iyp 5ucte ek53ge speed of 50 m/s and then completes a sec7k350 + tv y5c. qlcs5uezpetiond 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 vie;+h e/d ,(ppq5wrzir 6g8 y5j:wch( f(xgtxelocity. If it continues, h, (:ehx g wz(;(wi+g5 qtijdcefpx5y6/ r pr8how far will 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 3s-rt eu ;)gro7o:uyib8hyb9s. ;d0 gc0-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, relative to the plank. What is the speed of the plank relatigci0;7hbt 9;gboodu s-8yy e sr.):urve 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 trav8bks/(jmdgje7 2-d *s9rkfihels 400 km at 80 km/h and 400 km at 100 km/h. What is the average speed of the motorist on t serkbdms*f7i/8 kd2j9-( hgjhis 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 9s .ikzw2gt0h toy car traveling along the x-axis. The graph shti g ksw2z0h9.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 .e d6zidw8pduu*k;k .to the motion of a toy car traveling along the x-axis. The graph shown below is a 8dk.. ;ie*wkzup ud6dplot 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 a72camhf 3:54h cotjqs toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the xh c2a3tc5:h4 o7sj fqm 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 velocd c;f81oa8 pkgc tci/,ity vs. time of a duck flying due south for the winter. At what p8ccia /kp gt1;, fcod8oint 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 tpm 677pnj8c2njtey;t+q v(yr he diagram below which shows the position and elapsey2 tj8tm;r7 ce(qy npp6nj+v7d time of a car 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 show99ffezxfs sf,+ar t0 1s the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleratfraffssexz0 t9+1f9, ion 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 ap 9bx3)ehgg(e) 0rvq for an object with the position time graph shohq v90eg3 gbrex)( a)pwn 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 quesei13 m duqh+(htion refer to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its original height. (1 qde+m 3ihhu
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 k.oq4: v*)ax2nigzb)jl xjy7information. An ideal elastic rubber ball is dropped from a height of about 2 meter)ikzxn7*j l.xya : vg4qo2j b)s, 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 tra-.g:7n;q 1w/y2zvmetwpe g gjvel 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 following scenario: At 5 4eb) i e4g0atr,jboc$t_0$, 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 the follopp yqvwo* f8 k6wx x:7-yok(*kwing 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 following scenario: g mvc3y dr(dmmut0o .9( l.qj)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 z1mv e ud91t.vto 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 1tt.4tm2xbc+b flruz3e ud sp2*4 (ohdown a ramp, across a horizontal table top and off the table edge. Which of the following would best represent a graph of the magnitude of the ball's accelerati4u*. lep s1u(43to fb22bzchrt+ dmxton 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 betweeca8fs4pn:pj h;2tay3t9a i :r n distance and time for an object that is moving along a straight t yp;ajnta9 43 his8:c:r2fpaline. What is the instantaneous speed of the object at t = 5.0 seconds?


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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.02: The graph represeni zy7p/9d/sh wts the relationship between distance and time for an object tha/pihz9w7 y /dst 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 ucvcyg31be a7p h *-2b66tyr2giph 4eq v1p,jthrown straight downward on Earth with an initial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air q2ic7 ypteahr46 vgby-1guh ppj*ve,21 bc63 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 v-g p,,wy crp2.i )m5uizvqq4uniformly accelerating across the floor. The time and distance ti4vi. qp,-wvc)qrpz , g5uy2mraveled 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 rep4l,ntwdg 4z0l resents a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown in the didn 4w0ztl4 ,glagram.
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 represen: po2wk85ke+2*uoiot2vb* rourme: a ts a toy car starting from rest and uniformly accelerubk2kem iaor*u:opoer2*:85 2t+vw o ating across 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 un7kzc1z /tg xht2y+f2 hw4* *kw *1zj+q omvuypiformly accelerating ball. The position of the ball each second is indicatez qkyu vj74*2+ wxm11+h/zg ht*f*c ok y2zpwtd.
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 fxi.- it2b*mr(jcp n6u. a(cxball. The position of the ball each second x .p bfxt(2mc6jaiu(cr.n*i-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 75s;*yc7fvxi o d20qwyc7zj fcw i5e2 unicycle moving in a straight line is shown in the graph below. io0ccf wwyjeq zv7i5*2572c ;dxy fs7
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 9: t/jbd ys;)3f vmtoyin a straight line is shown in the grfmv);t9:o /t y dsyj3baph 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 f szy;pqby4e9*9 f:fd aalls 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 descri,iv- dib u24xgr *t.yybes the motion of a marble on a table top for 10 s .xbyid -yvi*4ru,2 tgeconds. For which time 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 de/jq ,3iif 2kwnscribes the motion of a marble on a table top for 10 seconds. For w/ni ,w3 fqk2jihich 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 accompanyiqoyzu9dg36ah( xg/ /rng graph describes the motion of a marble on a table top for 10 seconds. What is the marbl 9 garh/zydx 3go(uq/6es average acceleration between t = 3.3 s and t = 3.8 s


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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.20: A car accelerates uniformly from rest for a time ofvwf,..5 pep lk $2.00\;s$ 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 speejirq; 4sv 64+i6dxko 5e,oxf egc,o11gfmh w)d 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 represent the motion of i1,sykkq jgt,7pi7pf c*i-r5; gka 5fan object moving with a constant speed in a straighi7, k*if5a st;c7pi pkgrq yjf15 k-,gt 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 ty(c zio-042m f 3gmhoghe floor for 10 seconds. What is the accelerat hf-(gmmyc0 4ozgo23 iion 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 motion of a toy caf f 1 .(zgebdio1x;0bbr across the floor for 10 seconds. What was the total displacement of the toy car for the entire 10 secondbode (;bg0x1 zb if1.f 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 describes the motion of a toy car acy sdil9ed zr 0, ;e.5ynb- /z(gjfhm-aross the floor for 10 seconds. At what times or time intervals must the net force on the toy car mn5g-aj drd- e zf;( sy il.9y/z0bhe,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;ppmi;h duzg521 cqy2/hr to 60 km/hr in 4.50 s. Which one of the following choices best represents the acceleration of th u5dch;zqg yi2m;1p2 pe 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) 350 e2 4,f(rq wgwfydt ge1v(wecovb shown. Which of the following statements regae (3b vv1q( y0efwrg,5w ) 4gwc2dotefrding 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 moves along the x-axis ac b1(tn4rkem v;cording to the velocity versus time curve shown to the right. When does the car have;(b 4t k1vmern 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 th8 (day*o5p pzb7q)g lyat the angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true about the ten 5 oq yzd(pbapy7)*l8gnis 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 traveling towax38 n82ju7bjgn8p x gx)v0es wrd each other.xej2ns7n8gj bpv)x x808g3uw
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 ox0 t3qtrzq7, is positive and increasi7qt0t rq3zo x,ng

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.12: The definitionv6t: zy9 ls3ckk 9)e +njseko0q. x1)7jfonsp 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 fol2*,te)a:4 r mbbnj,ol)goagj lowing choices identifies quantities that must have agbg,) *bme)j4nla,:o j2ort 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 movesm)k le /s puv;4ia)et1 $3.0\;m$ 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-tic+dldb 2ty wf1k7;bx+me, $y\;vs\;t$, 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-dimensional track for total ha;ll3 g2l7gw time T in two paa3;g7l2l lhwg rts.
• 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 f/8no )ew5ki 3et-)wffrpr: kv or the motion of a car on a straight track is shown in the diagram. The thick line represents the velocitw5 rf/e3)rk ow- i8n:kev)ft py. 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 motiozzwgvss.rv*7b. 9 mv b+b68oan of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that thz.w6 + s *7bvgr8smv.zboabv9e 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 givene sqs* ocl8a z6sy-f;o4s/ (bn by the position vs. time graph shown. For what time(s) is th; ef8(ysbn /6*q calsos-4s oze 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 given by the velocity vs. timi /t8jjl: mszq1vh3 ,ye graph shown. For which time(s) is the acceleration o8j,1qt 3 m :z/hljiyvsf 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. timxtq ) 0zanz.,ee graph for a fixed time interval of an objecz n0qe).,a tzxt’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 yr)ht r8xem;e 3m+ fyg.v esnb/ g;14dhorizontal 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 parts y n5:3ic*i z.bvhp0sd:
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 rear3 g 1q j6eskedb;/ p3atlwlqx62b-u *ches 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 r s3rrt).rwjd/ cr4q;jeleased from rest 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 of a pjm;ki o7wj- (larticle moving along a horizontal axis is shown. What is the total distance traveled by the particle from t ;i(jojklw-m 7=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 choicf ezonq: d;(qxr), vw(es correctly identifies all of the listed situations for which thvn q;zo,xfw(eq(d ) :rere 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 for an ob )tdi*hv(p o0+xv nf)zject moving along a line is shown. The object starts from rest at time tf*d p() n +vv)oitzh0x=0 s. At what time(s) does the object attain a maximum displacement from its starting position?


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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.17: An object starts at the origin and its velocity along a line vs. timc14dy c7 k:suke is graphed. Which one of the following choices best gives thk ckcd4 :yu7s1e 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 mosrq9 s +.(6vez;erce bving to the right on a horizontal track, each with constant acceleration. At an instant of time, the informatioqbss+z. eee;9vrc(6r n 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 positr4l2rx rs-7hg9olsv4 ion $x$, 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 ow5ae -h9jawn)mb -t+ 59sosbane of the following choices correctly describes the relationship between the average speed of the truck to that of9 he5sastnaob+9- jb 5m-a)ww 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 besuqqg0 9p13teu t describes the instants of time, at which the car and truck travel w 3p uu9q0et1qgith 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 aq*e8 u ulp5m0bxl n+7and will move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the following choices correctly identifies the relationship for be q57n8up*xa+lblu 0m oth 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 lig 1y7qb/p; dyvne is shown. At what time(s) is the object moving with its gvp 1g; y/ybd7qreatest 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 fowg*wv :jdvh0z7 5 -sdhllowing the position vs. time graph provided. Durindwjhsv0 -5zwhv7: g*dg what time interval(s) does the mass have zero acceleration?


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