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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: 匿名未登录  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 at h :um94od8or+*hr2ezcli9 q constant 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 of distance per unit time without reference to a vf1a y- 0t+gb qvs37t1pzao9mparticular direcpmoftv+q03 91s -a 7bt1g vyzation 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 lap around a circular track at an ;.u ) ,lo6twxbpxihz9bal)2v; nj cc)average speed of tx6 l) o;xv2wchlj;anbibu,pc9. ))z 50 m/s and then completes 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 move4mb3 05df/vc jk/fn ivs 0.80 m in 1.0 s at the constant velocity. If it continues, how far will it kjd n05//vvfm c34fibtravel 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 stationac 2 .dpsho90yary on a 30-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 thp9s .yd ao2c0he 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 80 km/h and 400 km a98kwyzfqz+b3 t 100 km/h. What is the average speed of the moz8fw 9q3yz+b ktorist 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 of a toy car traveling along bb:4i s;8r eu 9:ur pawc0o2c+r-ba5ecpr ig+the x-axis. The graph shown below cr;c-pc8pirsa 4+b5re a20:ubiw :+o egu 9rbis a plot of the car’s velocity in the x direction, $v_x$ versus time $t$.
During what time interval was the car moving towards its initial position at constant velocity?


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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.21: This question refers to the mo*uyt;8fm x4s-n2f+bp:sxa vv tion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s veloavx-myvp 8xbs;*2nsu4: + fftcity 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 traveli6 xtb kfw(g:a,ng along the x-axis. The graph x kfwgt(:6 b,ashown 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 grat4eli:a*/ a4gbm1oy y ph of the velocity vs. time of a duck flying due south for the winter. At what point did the duck stop its forwa:labamt4 g1 e /o*y4iyrd 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 be;olx3ntg a(z 73 2ei/(3yfws qc s-iiflow 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 third second?tfsl (2x-g(3zi 3s qfyciw ieo37 na;/


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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 chhhwxvi ry5/ ph78,+p,f(hkwhich shows the position and elapsed time of a car starting from rest and uniwhr5f7xiv+/hh8cyp ( hh, pk, formly 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 the velocity time graph for qbi y6*5 -8v1d8*t zqubujsx tan object with the position time graph shown in the diagram at i u1b8xqs6u*-5y jtv b8d*qtzright?


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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; v .i6m;ak*iup(n ssb question refer to the following information. An ideal elastic rubber ball is dropped from a height of ab*; asskmp n;(vu.ii6b out 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 folirj-3 ugsk6,)ca9 eeplvp r9: lowing information. An ideal elastic rubber ball is dropped from a height of about 2 ms-r:eu l9egvij pp,6kr 3c) a9eters, 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:fc1rg-+p or6g e9yc i 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 scenywpzm h z6 c)u.5)*zd,qse)st t qe(-eario: 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: Antic; ;y6 c t;vkit/y8t $t_0$, 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 e 1 k.3))lcdito:qi pvfollowing 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 scenario: A: 7wmg 66cpohut $t_0$, 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 r(pclsq ()7d+b7ge (hx tb,qyjamp, across a horizontal table top and off the table edge. Which of the following woqs tl(b7jpq+db 7),x(yeh(gculd 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 thw+wrh s6h/ 9h/1 b*1fpzmi doye relationship between distance and time for an object that is moving along a straight line. What is the instantaneous speed of the obbi1 d /p1/+mzhrh y s6ww*f9hoject 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 represezkg g-vus g8e:/cna bj4e). m)z/kx xu8t9b,ants the relationship between distance and time for an object that is moving along a straight line. Between what times did the object have a non-zero acceleratk8usa g./z8jv b u ,9a)x bgck:)zxete/g-4nmion?


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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 an0k.: faxw :a1i;k,uev xf x3io initial speed of 12.0 m/s from a position 10.0 muxa.fi:0v ;x,i: 3ke1ofwxak 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 agaah2dr1,q:p2x v0t zi cp*8lnd uniformly accelerating across the floor. The time and di2qpzc,da28 hvipg*:t0x a lr1 stance 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 fgq*ghurr7 ny5 3dt;/from rest and uniformly accelerating across the floor. The timeg57hq rn;yg td/3*fru 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 rest and uniformly a gvskg7za.4:p -v do+t zp4vtog 7s+dga-k. v:ccelerating 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 uniformly accelerating ball. g:wk (t-cup(o The position of the ball each second is ikt(-g wo(cu:pndicated.
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 thw l1y8x8hjr )/uhfa 5ye ball each second is indicated. 1ah8rjy/fwhu8)x5ly
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 oni+ap *58 ,wbsxkpeg9ruv 0k5tk+eo 8q a unicycle moving in a straight line is shotp+k9+ogbek8,0k *qps ie 8x5 vu war5wn 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 crj/xtce e)-1x kp p8.xircus clown on a unicycle moving in a straight line is shown in the graph belx.k-x)c e8xp/t 1 jpreow.
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 va nag2ortf i*8 5)c .x.nrju.prcuum 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 to+: j9zqw8,qbb;bemz he motion of a marble on a table top for q b,ob jw98zmz;+qeb: 10 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 accompanying graph describes the motq tx 5-sluu ll)..yv;jion of a marble on a table top for 10 seconds.5ulxqjvl)y .t. -uls ; 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 describes the motion of a fs /w7.d.dnurdz 2w8n marble on a table top for 10 seconds. What is the marbles average acceleration between t = 3.3 s and f sr./8dw.ndud72wnzt = 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 uniformlyv,x3;zyi/ pq i from rest for a time of $2.00\;s$ through a distance of $4.00\;m$. What was the acceleration of the car?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.06: An object, thrown straight downward wi qw vu*k+mnh)2th 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 the43u emd6sj qn6 motion of an object moving with a constant speed in a straight line?3ej66 nsm 4qud


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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 tl 0l bs.pjj ()6knx hk2z:x/vqhe floor for 10 seconds. What is th2sph)vx.qjzl(j:l kk0n 6 bx/ e acceleration of the toy car at t = 4 s?


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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.25:The accompanying graph describes the motion of a toy car across the, ot;zldz q/rph4 1yu. floor for 10 seconds. What was the total displacement of the toy car for the zo ;1,r4 d/pz ylu.qhtentire 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 across2oh 4pkmz 1l bx2);rqi the floor for 10 seconds. At what times or time intervals must the net force on)rxkqo2;li pm h2z1b4 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 accelertb bygjn*93n;07rl zt ates uniformly from 0 km/hr to 60 km/hr in 4.50 s. Which one of th gy0lnbz3bn7; *tr t9je following choices 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 5x 1oax60efzhyl.(l mcurve shown. Which of the following statements regarding its motion is NOT CORR0ox(6 xye51zll h .mfaECT?


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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 acc g8beu:g xaz(d*ox5/h ording to the velocity versus time curve shown to the right. When does the car have zero acceleraz dga xe(/g:o*ux5hb8tion?


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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 tenytnddg0fc. t /4ff) y(nis ball is moved so that the angle between the velocity and the acceleration of the ball is kepttfn)dfg cy4./y(d0t f 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 traveling buq) iitc-; j,toward each other.t)-cj ;ib iuq,
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 is positijrr6x)x/3o tcj : 2cknve and incno jj6cx 3c t)rrkx:2/reasing

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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 average uf dwyc,(b) y1xclj9zi- .st6velocity 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 fol x kb.vb0ob+nqvk9; b(lowing choices identifies quantities that must have the same directinkb v(qvxok ;+9.bbb0on?

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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 k+i,oanfy .v5 $3.0\;m$ 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, yxiv8+p bk7c7m+b-qhm e* vx *$y\;vs\;t$, 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 ;j * .cvdq-4mzdn/ll xalong a one-dimensional track for total time T il 4dn;z. v*clqdxj-m/ n two parts.
• Part One: The car maintains constant non-zero speed V for the first $\frac{3}{4}$ of the total time.
• Part Two: The car accelerates uniformly to rest during the last $\frac{1}{4}$ of the total time.
What is the ratio of the distance traveled during Part One of the trip to the distance traveled during Part Two of the trip?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.23: The velocity vs. time graph for the motion of a car on a straight tr m(3lwp -kh6 i6d-zpg )1jaqr/xh q,pyack is shown in the diagram. The pkij/y a(1dq3r6hwm) p ,6g -qpl-z xhthick line represents the velocity. Assume that the car starts at origin $x=0$. At which time is the car the greatest distance from the origin?


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.24: The velocity vs. time graph for jgjvijx6n5 89the motion of a car on a straight track is shown in the diagram. The thick line re v8jji6 jxgn95presents 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 p/5kit l1gpd4c osition vs. time graph shown. For whaip clt/d45g k1t 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 given by the velocity vs. ti 580)m:k qd6v1 sqacqrdnw:tfb 2t c0rme graph shown. Fot mq tr :d2k 5fac qqs081c)wvrnd6b0:r which time(s) is 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 area under the acceleration vs. tiun4 bl-2+bo c+ p:kqqyme graph for a fixed time interval of an object’s mo-n4:b 2lyqkcq+ ub +option, 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 mgb;3;d0a snu along 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 tripys 2 2wpsb :u2/gpum.p in two parts:
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 sf ausb y751(74t 9 omkefs2ysis released 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 reaches the ground in a timeq+9q j e+q6-* -syzegqmz9 6, clzlr7uf)nvi v 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 vsku; ym9 5p*oy4ctr n,n. time graph of a particle moving along a horizontal axis is shown. What is the total distance tra m* 4kn,r9;y yout5ncpveled 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 the following choices correctly identifies all myv6;r b,w.qe of the listed situations for which there is ;6qybe wr ,m.va 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 grbn 51-ft5 znj-ezcp jam5s/q/aph for an object moving along a line is shown. The object starts fro/mbjfen /z5cp- atj1 s zq55n-m rest at time t=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. time is 1 jclf;yx5 wnv3c :v9kgraphed. Which one of the following choices best gives the proper interval(s) of time for which the object is moving away fro:;1j xvv9kwn3cc5 lfym 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 with hbe x ps zbx,)c :q3v*n2g (f3etm68smconstant acceleration. At an instant of tb2sqpt *3hfne:8)zm xs cme(3b6vg,xime, 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 l;d(fhv 6f:3hjgwl 7 hlu0g9da 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 the graph, which one of the following chvn udb+4jgx:u.lcsw/q/+n06.-8fih pl hbyyoices correctly describes the relationship between the average speed wnb+8 /c fbu :4dl.y u.gp6jxih hsyq -v0ln/+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 choices best dxp gyw/a+s 29tescribes the instants of time, at which the car and truck travel with the same sys ptagwx /+29peed?

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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 orir ,8awskp11eqkjtc7 2 gin and will move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of k1ajrs8k 71t,p w eqc2the 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 linef 4;qw;le4gki1i.o jteq8v)i5msh n ( is shown. At what time(s) is the )j 8m;v.i;4g5ni eq1he4 ofi( w tslkqobject 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-axi6h++vhn9ma+;u p8( evckxguu z9)ww ks following the position vs. time graph provided. During what time interval(sk(xn;g+vwp+auu 96v z9hmwhu c+8 ke) ) does the mass have zero acceleration?


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