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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 u:p z. 8nzhkt0a 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 unit time without reference to a particu 2n l,ibioc1;re:g xj)hb5(dn lar direction i ) (ob,lh1; jg5 de:bcnn2xiris 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 cirktlum -pfo:i*8*nt/ wcular track at an average speed of 50 m/s and then como/8 *plkt*:fmtnuw - ipletes a second lap at an average speed of $V$. The average speed of the vehicle for the completion of both laps was 80 m/s. What was the average speed $V$ of the second lap?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  95.03: A toy car moves 0.80 m in 1.0 s at the constant ve: h yhfsh -5z*f8m.hmzlocity. If it continues, how far will i.mhh y5zs:hhf-f8z *mt 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 30-kg plank that is slidi+ geicm)9k 3c6zdgez0ng 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 rel d)+eg6imk egz3cz 90cative 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 km6- dqelb ssm+*/h and 400 km at 100 km/h. What is the average speed of the motorist on this trip?qsms-bel* +d6

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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 rp), -d4 .dstnmx gyzwm9 h;hwup(p3r 5efers to the motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s ve;y w (mt,r95p3.) hpnhdgd zms-x4puwlocity 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 cs7 hckc2bt9rqli zzc8e( :(o(ar traveling along the x-axis. The graph shcrlo: cs(9t k(ezcbh 2z87iq( own 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 toy car traveling along t r(,w*hgavv9 xhe x-axis. The graph shown v*wg hr(ax,v9 below is a plot of the car’s velocity in the x direction, $v_x$ versus time $t$.
How far did the car travel during the first 15 seconds?


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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.15: Given the graph of the velocity vs. time of a duck flying du5;z6c 0as( vuf :c:yk4e.2b dtmdkxmv45jvj ye south for the winter s0xyd (c jmcz4 25a6j;:5ey:btvduf4m kvvk.. At what point 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 the diagram belo7k0qa70v tk2bu ii1v/nbp (zvbb )ua: w which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the average velocity of the car during the thi0 zptbavb b)q7vk:a u in(k70b/vui12 rd 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 9ubvq 1tcds /bhe;rw2m /9:ckthe diagram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleration during the entire 3 second interval is closest 9 qh1b bcsu9c:dm v/2/wtr;ekto


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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 o 0vw9cp:*dk(d ,d3 q/ yztzdebf the velocity time graph for an object with the position time graph sho30zvywe,: kqp(c/zd dd dbt9*wn 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.,y,s wa 9,ieja An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to sae,yw,,9ai jits original height.
Which of the following graphs would best represent the distance above the floor versus time for the above bouncing ball?


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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.29: The following question refer to the following information. Anq 6ikfaw rr:mr2qvz+q9 2)o6a ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor arqr2o awr2q+ m9qf6z ak )6iv:nd 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 spee guyylhcmvd,t-0;x - kgw6r( ;d 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 rorpex dr.(-q m/ ;r9zuefers 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 follow6podnn8f h:se3z7v vbrzl. 6/ing 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 followeu rdxvb3 2 gcb)v7cjl,dxqa;n:93d (ing 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 tzy,na)rrr i;0 o 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 down a ramp, across a horizo8dx3gnnmk.d7p*jn. ; dv*pn :8n my gnntal table top and off the table edge. Whiv*nn.m:pp87ndggkm3n; d x*.ny 8d nj ch of the following would best represent a graph of the magnitude of the ball's acceleration vs time?


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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.01: The graph represents the relationship between distance and time for wvwip.* 13srhan object that is moving along a viwp1h3sw* . rstraight 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 reprerv z5zbq*1*d cluokq+u: ta-. sents the relationship between distance and time for an object that is moving along a straight u1: u 5tzdr+b *-zv qlocqk*a.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 thriz xgx*j e g*cs4n ;oqegq7:)/own straight downward on Earth with an initial speed of 12.0 m/s from a position n;gceiqzg*q g: oxe 4sxj)7/ *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 below represents a toy car starting from rest and dy33* ik etg5uuniformly accelerating across the*iu3 d5k y3teg 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 represents a toy car starting from rest and uniformo zngfh (+it )v*czh+3ly accelerating across the floor. The time and distance traveled +i)z*ht+o v(3 cngzfhfrom 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 startia2 5nnexpc(9 nq1li ,nng from rest and uniformly accelane5q2nn, xln 1(ip9c erating 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 unv z4avo45zj -2afdxv8 cene7+g .r:lmiformly accelerating ball. The position of the ball each secon aj5e v.rav 4ol4zn:2devz+gf8x-m 7cd 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 ball. The position of the bsiam ,f kpt*2nhf,*anh:1rg i/t9ns)all each second is ina,h)st2k:i,ta*g1f9rs n*phinn/ fm dicated.
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 xl sg5e.gx .a/tk(x4pz5.xae on a unicycle moving in a straight line is shown in the graph belo5.at xaxlz(x k/.gxe54.e pgs w.
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 line is bee .kpepx,:8shown in te:kp e,. 8bepxhe 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 vacuuv 9e*95twa/ mh7phc iqpg;l/qm 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 yfyl ;4 aegna( tzb0p8kp h6vr6bs: :.top for 10 seconds. For which time interval(s) did the6nbkbvpl zy.f ;ta846y a(shr :0 :pge 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 describes t(+tjeb8p 1 utqhe motion of a marble on a table top for 10 seconds. For which time interval(s) did the maqe 81j( +tuptbrble 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 deny0jgfuw0d9un/ m+y ,7 j7 tybscribes the motion of a marble on a table top for 10 seconds. What is the marbles averngj+fw u n,tj07myy079d/buy age 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 frovg b0w+an4nc ve8i34g im )om)m rest for a time of $2.00\;s$ through a distance of $4.00\;m$. What was the acceleration of the car?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.06: An object, thrown strai0w2r x812pe f2dqqodca+u3gu ght 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 following graphs could correctly represent the motionc e-xgr ;2eq-dd/a h8q of an object moving with a constag a-reqecd; -2x/h8d qnt 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 across thzhrbn 32g2 a s6/5qlibe floor for 10 seconds. What is the acceleration of the toy car at tl2n 5zs6ir hg/ a2bbq3 = 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 fl)3afk;hia 0c yoor for 10 seconds. What was the total displacement of the toy car for the entire 10 second interval shoaa ykc0h3) i;fwn?


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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 floorj4sur :hq1k: 0 pm ik9knai.9.zhq5e i for 10 seconds. At what times or ti r9k ehh.5:ipumi1j:k49 anq s0 .ikqzme intervals must the 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 uniformly from 0 km/hr tz5// zialzbk043tmkhl n hb01 o 60 km/hr in 4.50 s. Which one of the following choices best represents the accelz0/ k l/0i t ablz315mhzkb4nheration 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. W//7)iyz ;i/dh : uiziffa r7tfhich of the following statements regarding its motia)/idf: i r;fhf7y zti/izu/7on 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 t j o*9f4tz-xfnv gr55xhe velocity versus time curve shown to the right. 4rvt55 jogx n*z f9-fxWhen 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 is moved so tha5ps 7 e+ch: 5/r3fhgy j ihq:s a)l)bi-kiydz)t the angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which- ed:c il s/ j)k3ai+q)y5gf5 zihpyshb:7h)r 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 kilometersmov : s2h,(c+ i34tjv kus.ssx apart and traveling toward each other.u kvos(hj2s css.x: v,t43+ im
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 acceleratio,ohtg t/w q)(qt*7cdzn is positive and increas d*gztqow7tc (,q/ht) ing

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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 averag+q, w+ydt2 4dr)nkbvme 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 o e,,bnz3 maj nh8vez60ne of the following choices identifbv83e ha0zm nz,j6e,nies quantities that must have 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 mov2az,ea cc)s )8e68ld *m inksges $3.0\;m$ 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,ku1 q +w cyrtv5mq53l( $y\;vs\;t$, 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,)+vukn vzvjch.6f) w along a one-dimensional track for total time T in two pa u)+n6.whz jf)cvvkv ,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. t)d jg(.0e2jp 0j5mjrcn * svp-k)mpp time graph for the motion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that the car starts at origingp.p*0- 2s)rpjv p e(mtc 5jjkdm )j0n $x=0$. 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 motion of a car on a strsb e0 c6)a*ajzaight track is shown in thc)e s06za*j bae diagram. 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 an object given by the positi35(d urm o5n9k2wx8 mkry 4oneon vs. time graph shown. Foxern2 9 ok(3wo5m5 ky4 ndmur8r what time(s) is the 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 give31f r gz(o z orb;ofv6og+i(f 1glc0+en by the velocity vs. time graph shown. For which time(s) is the acceleration of the object equal g offgz+zogeof1o +;6r0 v1cl (i3r(bto 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 a9 ;nm7z)8r vqokrsd4drea under the acceleration vs. time graph for a fixed timzd r7q9s8r4d);k nmo ve interval 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 speef9v6zexw9vt8 mqnp99d.
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 pu a6(9i ro9sfaarts:
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 reot xr17c vmeq f*glm-s:nmjzqn0,:- 5leased from rest and reaches the ground in a time of $2.50\;s$. Neglect air resistance. With what speed does the object reach the ground?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.03:A small object is released from rest and reache7 9l chr:zfqh/s 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 along a horo(;zytz/ 2q6l1 q(sge )lrfut izontal axis is shown. What is the total distance traveled by letu(ql oyzt1q2r6 sf )z(/;gthe 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 the following choices correctly identifies all of the listz,hh (hua, q,zofra)ky j7mh/u eqfk2m:9r 0+ed situations for which 7,ama, :kuhf/0+ hqe) 2mhzu o,fq zhkry r9(jthere 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 object moving alongzxc j/pj4i z kqbv,7e7:) yo-w a line is shown. The object starts from rest at time t=0 s. At what time(s) dkb/yp7 c jz )z4q jxio:w-ve7,oes 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. time ist13;ds sggj vg3 /cv:wm;qtn 7 graphed. Which one of the following choices best gives the proper interval(s) of time for which the object is m /dwgg3t: ;cj1nqv3s7sgtm v;oving 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 track, each a,6 iv;cwk(i s(ra-wj with constant acceleration. At an instant of time, the information aboui swk(a6avrc(w ij-;,t 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 positiy7vhx. a w//a(vlh h;con $x$, 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 tieds om)kr7 1;vme shown in the graph, which one of the following choices correctly describes the relationship between tvmk17oerd) s; he average speed of the truck to that of the car?


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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.42: Which one of the following choicesc. h6euk82fvr best describes the instants of time, at which the car and truc c2ur6 vfk8e.hk 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 qgi525k0dcn-6zht h l Q, each start from rest at the origin and will move along the x-axis. The acceleration vs. time grhtg0i 55 62hzkqn-dlcaph for each car is shown. Which one of the following choices correctly identifies the relationship for both the speeds $v$ and the positions $x$ of the cars at time T?


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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.02: The position vs. time graph of an object moving on a horizontal line is+c63ewp heh :6zxmf+o shown. At what time(s) is the hx6+wmzh:e +3f6o pceobject 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. tk(t;qk9jo4* jr-zm+t y mhki)ime graph provided. During what time interval(s) does the mass have zer4 -+ ij9kzrk*kt;tyj m (qmh)oo acceleration?


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