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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 wj xi.r; gz77da 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 ;,x,ci*3aqm - (ug8pv.r1 lluqj op plper unit time without reference to a particular direction is calllpuuc,-1l*xpg . jrpl3(im qv; 8 oa,qed

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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 wf/tw2f t f4yr80mmkgzy0pdo1e./j6lap around a circular track at an average speed of 50 m/s and then completes a second lap at an averamrpe0 4y8 /kd f fgfo0w2zt/6jmwty1.ge 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 0.8 cks8e)cq/3b 6ejb. a2g3 iian0 m in 1.0 s at the constant velocity. If it continues, how far will it travel i8 abq3se g.ikc3e2jni)bca/ 6n 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 sliding at 5.00 m/9 ndra5w) c34el6yr-wj)nyhmw u 9/ l8isl0 kns to the right across a frictionless pond. The boy then turns and starts walking on the plank at a rate oyul iwa0lhn)d yl wmsew -rk4)998/jcn53 6nrf 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 km/h and 400 km at 100w, b-jln+l vm)tk, j+a.f* iki km/h. What is the average speed of the fjl+k)miwia,lj.*,vk+nb t - motorist on this trip?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.20: This question refers to the motion ox h/*pm ucictjl0c:lr .ox+ oo;*i*bs w. gi.(f a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in theo.gml x *. c:os crjp+0ilxo;i/h*w *bc(it. u 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 aloqg93+ /dym eee0;f apwng the x-axis. The graphe0a m9e +/f;ewy3qpgd 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 refe:ikoa9rq+nnot 6(by 7 /8nmrsrs to 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 d6in+r7q rn( n sy98omk /:abtoirection, $v_x$ 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 ofpz17mw jilh;)x;g edh 1n0sd4 a duck flying due south for the winter. At what point did the duck s)h1pdjzg;4sm x 0d; n7h1wleitop 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 diagr9t9up al*n za2ac*k: xam below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was thepa*9tc:an*zl u k92ax 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 whic-bjr*byt q20p2/pa jn h shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straigajr/yb2 p jqpb-20n *tht line. The average acceleration during the entire 3 second interval is closest to


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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.20: What is the shape of the velocity time graph for an object wit0)n.w9p 5zc qk /egdabh the position time grkncpd 9ba wg5z/q e)0.aph shown 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 refer to the following information. An id/*d, n aeqhif+eal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its original hed+n/,hi e*a qfight.
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 ideal elastip6pwctf73 b o*b 0b2qic rubber ball is dropped from a height of about 2 meters, hits3opb* 2ti607bwbq pcf the floor and rebounds to its original height.
Which of the following would best represent acceleration versus time for the bouncing ball?


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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.39: If a boat can travel with a s ,n0se4tmzi; cpeed 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 referqhzm4r5i7b; ns 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 the following sh t)img,u7s au)eo/+.ui 5jqacenario: 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 folqsb e ::od8o6(cghpo. : pqqs4lowing 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 the following scenawn4vw t6 .vpe8rio: 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 sdxgw q*b1k)91 m- kuk4z ws1xhorizontal table top and off the table edge. Which of the following would wqsmg)1 x- x 4s19 u*k1kwzkbdbest 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 relatiozmxgl1cfsf(;3jihgae0, qum 43* m5snship between distance and time for an objef3 es3uqm*1x5zcmf(imgg0,jal4 sh ; ct that is moving along a straight line. 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 represents the relatiowit-bv546 ;nerk-:tl /t vabh nship between distance and time for an object w h b5 ;eatvl4-bv :i6/-rtnktthat 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 strai1 0 vlq/ shay-wihwc;d*s;vu-ght 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 objectycsh-;u aw/-ldsh;qvw* 01v i 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 representsecr:2moz hve6(w s2wak ;:: ct a toy car starting from rest and uniformly acceleratw :: ethrwocke6z 2:( v2sam;cing 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 repres0vn +bhnp*s.v ents a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from nv0v*sp +.bhn 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 rel1*xlivfm -ik:z u(v n n))+wost and uniformly accelerating across the floor. The time and distance traveled from the start are shofk:wvnn) l+ ivmo )uzl- i(*1xwn 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 acceu2osh+p9 z3k zlerating ball. The position of the ball each second is indica u+3kozs2hz 9pted.
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. Th -- pwn/oelvd:ch)sj: e position of the ball each secoo /)h: nc-s:jw-edlp vnd 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 a l zeo-89-diuon a unicycle moving in a straight line is shown in the graph belowo9z ida8lu e--.
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 clownjce3v 66gj b t4sz8h7n on a unicycle moving in a straight line is shown86c3znsjhj6t b e 74gv 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 vacuum near *: pjj knn)m2v ;bpm.vthe 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 maflke -o985 asy97tot xrble on a table top for 10t5lytfea ko-s8 x7 9o9 seconds. 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 accompanyingr54 -4;opsl2 a qu jacfu*7pdg graph describes the motion of a marble on a table top for 10 seconds. For which time interval sqpaf4g4uuc2;lrj5d-*o a 7p (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 marbl+xv (2(- suvof j t7fnj21qlqze on a table top for 10 seconds. What is the marbles average acceleration bet 2nzv(-lvsjj7u q x+ qft(of12ween 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 acceleratesvfwm9x n;wyi/8j7e aqv9 ,jj8 uniformly 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 strai3 .0-sgxaqkzkght downward with a speed 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 fo7y5 g07vmp bfzllowing graphs could correctly represent the motion of an object moving with a constant speed7fyg p7z0m v5b in a straight line?


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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.24:The accompanying graph describes the motion of a toy car acros5lb(3c avuc1wx1 m )bgs the floor for 10 seconds. What is the acceleration of the toy cw1gmx) vcub 31c5 (balar 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 car across the fz a ubfil3b3,e 5c/5bjloor for 10 seconds. What was the total displacement of the 3j5e3azb /icf 5 ul,bbtoy 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 describes the motion of a toy car across the fl n :/7kx,rokjfoor for 10 seconds. At what times or time intervals must the net force on r o:nx/,k7jf kthe toy car be zero?


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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.03: A car accelerates uniformly from 0 km/hr to 60 jlu-t-20qsyj h7uc20iojp/ ukm/hr in 4.50 s. Which one of the following chu to2q 7yu up-j-0ijj0 hc2s/loices best represents the acceleration of the car?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.07: A car has the velocity versus time curve shown. Which of the followq osl:- at.9ye 8mki4..yoxgd9tgi 3v3 hyd 4qing statements regarding -ylhdy. 94.gksi at.q48o ixdo3tvmg9e yq 3: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 acclx4enjjq7mr7v i6 t;:ording to the velocity versus time curve shown to the right. When does the car have 6ve4;qjlj 7 xn7it:mr 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 qd8ctch8 *iy :f8xow+ moved so that the angle between the velocity and the acceleration of the ball ii+fqc:y8 *t8 doxc8whs 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 tra b5 w)enqwq,7h).hgekgk01s bveling toward each other.0kqn,)gk b7hegwhq5 1)ew.bs
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 ksn:wu:i8en,l(nxc *gy3 df0acceleration is positive and increny3, :kne:80xncg(f ld suiw* 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 definitio2z4 **vzoaks zn 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 u5/ p+/awwh0 h11o ug xanqmb,r drx1-following choices identifies quantities that must have the same directipng1 x u5/bd whaax-rho,0r+u1 w1q/ mon?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.17: A toy car moves eh2lqr6 1crpu6-gpf0 .xo+da $3.0\;m$ to the North in 1 second. The car then moves at $9.0\;m/s$ due South for 2 seconds. What is the average speed of the car for this three second trip?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.05: The position-time, q0 hf3i;zjtom30z ng8$y\;vs\;t$, 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 forl+rfx o 7 bj51fcm7)st total time T in two pa5bj +cf1 7osf7)rtm lxrts.
• 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. timey7ffr8:k2 uxlb ,in;b graph for the motion of a car on a straight track is shown in the diagram. The thick line yfn8x: ;,rb2lbk7iufrepresents the velocity. Assume that the car starts at origin $x=0$. At which time is the car the greatest distance from the origin?


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.24: The velocity vs. time graph for the mo0r ;ys k fkrd1uty0qj *1qr jamkg083.tion of a car on a straight track is shown in the diagram. The thick line represents the velo 0k;y1 f1yg qa*.mjrd8u0t0r rkk3q jscity. 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 an object given by the position vs. tim zrqv/b-t,7yd rg:zo,o nhn 4/e graph shown. For what time(s) is the speed of the -,hdo4,bny g/nr/zq z :7v otrobject 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 anq51mx9p(rl iai6ivdgp ;e()3 rk h bu1 object given by the velocity vs. time graph shown. For which time(s) is the acceleration of the objgihx1)1pk963r( i ( v uem;5aqirld pbect 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. time graph for a ;0e,rcoe adfoni) g:6fixed time interval of an object’s motion, what quantity has been de;6oee 0f)r, o:din cagtermined 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 increas -vlom uvt39+jing 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 b:r8fx d3:0ly ga ssu7ya9;ox(c kgi8parts:
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 n: 8ssc ckp*;fy.w tb;oi:ho6reaches 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 reaches the ground in a time oja-q.. :u hzc75okkuh+akx2 1 b(bewcf $2.50\;s$. 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 parq yhwfca61s//r 8 0jzcticle moving along a horizontal axis is shownyr/1c0 8qj6ch zw /afs. What is the total distance traveled 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 th3 rxawa(2mkw (e following choices correctly identifies all of the listed situations for which there is 2krax3 (aw(mw 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 lin8 t. /ojp:c ytmdt1q r-3ar0kke is shown. The object starts from rest at time t=0 s. At what time(s) does the object attain a maximum displ-r:kctpm a / oytq8.jt13 0krdacement 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 velul77) 1wqi jgsvyfp; od(u(y/ocity along a line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of time for which thuy q oiy7u;/lwp(v7)(g1dj s fe 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 a horizonc)d8 y,.dmdxm tal track, each with constant acceleration. At an im.cdyxdmd ), 8nstant 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 oaafve)tr2tk*/ ye/ ) position $x$, 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 the2x,2jod.sy g*yl;c mt graph, which one of the following choices correctly describes the relationship between the average speed of the truck to that of the2l; 2oycm.x tjd ,ys*g 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 describem z(cix01v)zfs the instants of time, amvcx0)1z fz(it 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, each start from rest at tzdebspid 4anky.r)d1 3 z(51ohe origin and will move along the x-axis.y3p1ne4 azids5ok( d rbd.z1) The acceleration vs. time graph for each car is shown. Which one of the following choices correctly identifies the relationship for both the speeds $v$ and the positions $x$ of the cars at time T?


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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.02: The position vssfh wm7(l acq z/*i74d. time graph of an object moving on a horizontal line is shown. At what time(s) is the objf l7z m7 a*whc4qsdi/(ect moving with its greatest speed?


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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.08: A mass moves along the x-axis following the position vs. time graph ro,nkcwu (7 5f9b hp,tprovided. During what tikubcr ,ow (n9fpt75 ,hme interval(s) does the mass have zero acceleration?


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