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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 de w1w8 q;s3k) m *:shpeqbb.tconstant speed around a circular path of radius $R$, if the particle makes one complete trip around the entire circle, what is the magnitude of the displacement for this trip?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.01: The change ofs8bm 2:a75k ; lq hdm3rolw2(6vbvd kh distance per unit time without reference to a particular directiol 6dh;smo3r km57bbvh8a w qdl:(22kvn 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 l8dnqdi8 ny :hll wl-9)4o+m jwap around a circular track at an average speed of 50 m/s and then completes a second lap at an al+9 lwlmq nnd 8)4ij-h:o8dwyverage 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 const51 5x: qjpsqjr.i)f wj,,rtp cdpv+8 bant velocity. If it continues, how far will it travel p5r1fdp,r :tvxjp+jqbqc5 8s,)ijw.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 sn + kms:t*p (k6cvyvx5tationary on a 30-kg plank that is sliding at 5.00 m/s to the right across a frictionless pond. Ts yn+p*mvkkxv5 :t (6che 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 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 80jm(cnpw2 w-lch*np2 7 km/h and 400 km at 100 km/h. What is the average speed7 w(c22p-n pwlh *cnmj of the 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 0 /8ke:dqm a3 8vvospcthe motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity invp m d/8eqv 3o0k8a:cs the x direction, $v_x$ versus time $t$.
During what time interval was the car moving towards its initial position at constant velocity?


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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.21: This question refers to the motion of a toy car traveling qcw)t-pu p8*z;u8 eldalong the x-axis. The graph shown below wzl8 )ep-*d8u;cqputis 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/2aul pzogp 04tjbg6 4 motion of a toy car traveling along the x-axis. The graph shown below 6 4tpa0z b u24/ljgpogis 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 ofe h+5x2hed kh1()briq i(h.xs the velocity vs. time of a duck flying due south for the winter. At what point did the duck stox.hehrisidh)+ h(5kx 12 e bq(p its forward motion?





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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.17: This question refer to the diagram below which showmmn4v 47afk wnpr.3p6 s the position and elapsed time of a car starting from rest and uniformly accelerating in a strav7wfn4n.pkr p mam643 ight 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 whic*bl s6yev mh6,7bs4y ih shows the position and elapsed time of a car starting f6leis bv7 b*4,h ys6ymrom rest and uniformly accelerating in a straight 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 t3kzbgg +t8.oj rlga3 *he velocity time graph for an object with the position time graph shown in th+ j3ro3lz.gtba 8kg* ge 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. tu9; g8:ky iz;b+ w dcwx39nwwAn ideal elastic rubber ball is dww8d: wn9;u9igybtz;k+x 3wc ropped 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 followingivhu+y b42s;z zr+:pb information. An ideal elastic rubber ball is dropped from a height of about 2 metephr :;z+sb2i b +4yzuvrs, 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 with a spmply.-l7 4 s wm (fg.ggfbtp21eed 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 refersun vh(6kddoxs :- ct3* 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 scenario: At 5dh23( qyb v+edae /ul$t_0$, 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 followii1la sj;:ihc6g e- 2 tfey+y6ong 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 th8;n+te9 +f klu j8c;tl u/xypje 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 4 nanw cd6ff *39j7xfyhorizontal table top and off the table edge. Which of the following would best represent a graph of the magnitude fa 93njc6f*yw dxnf74of 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 the24e7xp5f(vbxtzm3 hlcjyp 84 bhkr19 relationship between distance and time for an object that is moving along a straight line. What is the instantaneous speed of th h7lb (pbkv4312xzh4 efpj589xm tyc re object at t = 5.0 seconds?


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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.02: The graph represents the relationship between distance 6h h +ox*);pc bhaazc5mfuz*-bcfc; 5and time for an object that is moving along a straight line. Between what times did 6 cz;hbf+c m55c p*bu-*cahoxa; zfh)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 downward on Earth with an 8.v *aajw maaj(,si4vinitial speed of 12.0 m/s from a position 10.0 m above the ground. I,4a*vsi a.(wa 8jm avjgnoring air resistance, the speed of the object when it reaches the ground is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.11: The diagram below represents a toy car71ilkgb0 tzb 5 starting from rest and uniformly accelerating across the floor. Theb 5b1 0kztl7gi 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 3qqfa..d0 eth zq)u*2rpfc8cy6q/ ut represents a toy car starting from rest and uniformly accelerating acrosspta ) .cz0fyudu/ 2tqcqfq q e3.8*hr6 the floor. The time 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 jhwf)x y5di29 qcqdqy)/ 9m g-rest and uniformly accelerating across the floor. The time and distance traveled from the starf-)ddj q52 )cq /ig yx9hym9qwt 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 accelerating ball. The position of the bal+i 6vyx(ee n. fy.bl8cl eac+yn6v .e.l(c8fyiebxh second is indicated.
What is the average speed of the ball between 3 and 4 seconds?


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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.09: The diagram shows a uniformly accelerating ba8nycv1 te aq-ial2j,:ll. The position of the ball evcajet2a i8 , :qynl1-ach second 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 c0 . n9fhf:.rkia9l9ot/ b elaxircus clown on a unicycle moving in a straight line is shown:9enr bltfo 0k9.a . 9lx/aihf in the graph below.
What would be the acceleration of the clown at 5 s?


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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.18: The motion of a circus clown on a unicycle moving in a straight l-t kh-z6uz 0pline is shown - 0z hp-zl6ktuin 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 *n6fv,7:ri40zcuv, tktcsk o 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 g t)x 2otgggmys lvpvhp -9zc1,-0mnz +h,px7 8raph describes the motion of a marble on a table top for 10 seconds. For which time interval(s) did the marble hag+tmzxpgzxy2p-s,0np, lv)mov9hh7 -t8 gc 1ve a negative velocity?


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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.12: The accompanying graph describes the motion of a marble on a table in1d pln0 k ll2*kuw;-top for 10 secondl1u0 kl k 2i*pn;ndlw-s. 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 gn:bqk o0;yn; describes the motion of a marble on a table top for 10 seconds. What is the marbles average acceleration byb0n;; k oqn:getween 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 )ljs vo 6,0uftof $2.00\;s$ 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 spepo(u+*)a peb o;qt7eg;3bhtped 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 correctl;u2 k f ifz. 10hbgjdm8*h)dxuy represent the motion of an object mov0fdh)u. b*zmxjf1;gd28h k iuing with a constant speed in a straight line?


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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.24:The accompanying graph describes the motion of a toy car avfet2 hm:kkijw7q)- ,g 8w.tlcross the floor for 10 seconds. What is the acceleration of the toy -,k2 .fw)hgvt t :jlq7wime8kcar 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 hsqj f)ca 4p/*dyvz9l7pbr:: across the floor for 10 seconds. What was the total displacement of 9qfa:pb* j/:yp hz4d7sc lv )rthe 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 describes t59d 3lxy6s lgehe motion of a toy car across the floor for 10 seconds. At what times or time intervals must the net force on the toy cal6x5 yeg 9d3slr 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 accelera-frcz lk (u rz.w7 omqh7nh5;tj3zq/+t+b t .ftes uniformly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices be7r zn+c mo3qfhjbrzw. /t;+zh f uqt5.ktl(-7st 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 thifcdbt9- v3h .e following stih-. tvfbc93 datements regarding 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 according to the velocity versus time c zve,fv7 g( ry6-pu1tbnrci-9 urve shown to the v(e-,v pbi -ryr1tf6ncgz7u 9right. When does the car have 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 zj9nv(m pxzl9.a5 eiu*( e2ehis moved so that the angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Whh.5 ( uj2l(iezezvm9x*9enapich 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 apartoho;;z b5nc87 qq jpc: and traveling toward each other. c o;job7p;hn5z8:qqc
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-axi eqj 3v6hkc(q0s. When the acceleration is positive and increasi6v(hj 3 ek0cqqng

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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 )z.o ec:5 rmb. bj ipzhn1z)r,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 dimensoe+a6c)p dd.we rm .z,ions, which one of the following choices identifies quantities that must have the same de)pd a +6,e..rwmocdzirection?

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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 movpxt-*q0p+2rn bmz u/kes $3.0\;m$ 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-ans;: )flt/x-jhbc/6 phh(.y ooebd (time, $y\;vs\;t$, 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 righd 46ndgdfl33jt along a one-dimensional track for total time T in two partgld ddnf3 34j6s.
• 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 mf bv6dy +9d+*w b9a)u6h g.e+ mwpviczotion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that the car staragu d vby.b69 pv+9c6+imefdw+ )hz* wts 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 grap7bmr i3y w4jdu*t ,j;rh for the motion of a car on a straight track is shown in the diagram. The thick line represents th tuwri,4m ; rj7j3b*dye 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 an object given by m3qs2y 1 lpfv1the position vs. time graph shown. For what time(s) is the speed of the object grea1qv s1 32lfmyptest?


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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 v; ,r;oaic(xii s. time graph shown. For which time(s) i,i ri oc;iax;(s 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 areaf.q:h3c rfm *l1 pzs:y g6167mjoepko under the acceleration vs. time graph for a fixed time interval of an object’s motion, what quantity has been determi .p c 6m z foyq6flpkes:ogj37r1:m*h1ned 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 -+1lc 68tzq h6avh oeialong a horizontal 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 par0 a3fg9o az- x09ez gckhth/5xts:
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 2xg2gpcuk:em 0z0 e- vground 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 froh6j-e ea. c,tvm 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 particle moving g ,nm6wtk d.e+jox7zzt:2e7mh; n (zralong a horizontal axis is shown. What is the total distance traveled by the particle from t=0 to t=10s ?2(ot;mx6kdz,. enhe+mg 7 7n jt:rzzw


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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 fkdjb- f/lb p ei(3)a7collowing choices correctly identifies all of the listed situations for which there is a non-zero accelerafa7d-/ij bkcl )pb (3etion?
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 acceleratiofbdckt-/.kmx( z7w a.n vs. time graph for an object moving along a line is shown. The object starts from rest at time t=0 s. At what time(w-m t7fk(.da kcb /.xzs) 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 y:)l ezd;h wh.vx).ntand its velocity along a line vs. time is graphed. Which one of the following choices best gives tdzh v).h. :e)w;xltyn he 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 to the right on a horizontal tracs1by / bn6*wbeeu-r v)v7zyoiiy0 e+2k, each with constant acceleration. Atv7 e6+2nb-e/esbywzyuvy) 0 ir b* io1 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 positit o:ct 0by4uemz(*1 nron $x$, 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 g:9if3nmb*4d z6if;ch +wl,wxao6 p)ubfvt 5 jraph, which one of the following choices correctly describes the relationship between the average speed of the truck to that of the car? 9f6ju;) :l* + ww3ab4dmf5fxo,6i cznbvtiph


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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.42: Which one of the following choices best describes the instantsb -2cog/ojrro4t k9g 4 of time, at which the car anokot4/9 -r2j rgcb 4ogd 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, qs*38s vbaran6;f x1 jn. lla:each 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 the relationshipln 6*vafs s;q:a1 a8nbxj r.3l 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 movingmp0b(05 sl-de ( j)pa*ftyduj on a horizontal line is shown. At what time(s) is the object moving with its gre5psju *-ty 0dlpb0 ej)a(mfd(atest 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 fz g6kmrdp )*,bz9uf.v7+uu g following the position vs. time graph provi +pzg,udvf g9)7fuz6mb * uk.rded. During what time interval(s) does the mass have zero acceleration?


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