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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 a constant speed around a circularv 7p;ozy44t4r;h v3fr;cx gum 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 witho.nyk6 y)mpy0 hut reference to a particular direction6)nm0.h pyy yk 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 average speed atep+1ro o.w/ofra wop1toe./+ 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 moves 0.80 m in 1.0 s at tsx nrf0nne 77+s5 ga/ihe constant velocity. If it continues, how far will it travel in/nra +xn0f s5i7es7n g 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 staqrzq mzt 9*fif.j1 t- 6t/ofj0tionary 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 thet -ft 1q/fz zqm0rofij6*9.jt 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 at 100 km/h. What is tg;2lu z;9oire0z* j ohhe average speed of thoo0u ; *9i;e ghl2rzzje 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 motiu/jl;(xqo.duv 8 e1 ljon of a toy car traveling along the x-axis. The graph shown below islju( .;1xoldj/v 8u qe 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 motionj2 mhsolg0x54 izkbq * g-2)je of a toy car traveling along the x-axis. The graph shown below is bjgsih- e)g* 25z0jqolm 2kx 4a 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 travelingorf 8bp8 ug7( q:ex6tb along the x-axis. The graph shown b(7buqtb g 8ofer:8px6 elow 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 dvnw rva,k-yzdsens0 /h **l -2ue south for the winter. Atn,wyr*2h-vs- nkva/d z les*0 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 below which shows the4 *1voqa( tgrl l+sfo+ position and elapsed time of a car starting from rest and uniformly accelerating in a straqlt14o(v+ r gls+*of aight 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 which4i lg ii 6a+osadr,/,m shows the position and elapsed time of a car sd+aolm4ri i,6,gsi/ atarting from 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 the velocity time grap,nb(rla,rx c ;h for an object with the position time graph shown in the diagrambxc;lr,n(ra , 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 informationd *hn/fqio tmy dc1 w7m0-lft73.,xux. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its original he/ 7humfc1nq t odyxtm7 d-3,xf0i.wl*ight.
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 folqez/h(;v u4et tz3 ap6*j j2smlowing information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and reb/jm3*et;e( pshu4tz zq2v a6 jounds 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 speed ofxp z*p+gg1g+f $v$ 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 (j.e kcy0ipb+6:1hdcg5e;8ahdvv oi 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 refersq ura7jtho mid() 3m, vdz-js1hczhp:0* 4( bj 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.
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 referrlal u).2vp- 7iswa bxdbf2dx *2:h6 ws 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.
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 scenar99kho e6 6nb6igu;67pkccbt rio: 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 wap(wei:g+ e nczmn/s,s: gc5h05cr8horizontal table top and off the table edge. Which of the following would best represent a graph of the magnitudeg /r( n we+gspca ichnewz05,ms5:c:8 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 dista arl9va* y omuj;vq/c(e/m3v 7ys60iunce and time for an object that is moving along a straight linu( olq6siam /jra;ycy0v /7uv 9v e*m3e. 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 rela3b y1cmf:vgz lt3j y2rq4q 7yl-z, /netionship between distance and time for an object that is vy-, g7ynqzyec 3z2 l1m/bl jqtf:3r 4moving 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 straight downward on Earth with an initial 2s 3pwpqaxp e2g03*d6s vo7d zspeed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resi 6sgpo7p2x*ze0pvad 3s3dqw 2stance, 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 repr ozsb 0;ekk eqyv-j7 x-9 )qf+5o/gyqjesents a toy car starting from rest and uniformly accelerating acrosq +foesy )5xg0bokvj - qjey7qk9;z/-s 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 represents a toy car starting from rest an* uhz 4e/b;atwd uniformly accelerzb t;* uwea/h4ating across 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 rest angwj wn f(4,;*s7jos mzd uniformly acceleratin, (o;7j4f n*wszsgjw mg 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. The position of the (e0kgu0; j lpgball each s;j0g p( ugle0kecond 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 w z7m/ir9vea9ball. The position of the ball eaivrz 99mw 7a/ech 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 circus clown on a unicycle moving . xxv-)c /rqdpin a straight line is shown in the grapxqr v)-/d.x cph 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 circuyn*om*3 ce irw(4(y4u yp5quys clown on a unicycle moving in a straight line is shown in the graph b4rpy *mn3qwu4*(yeu c5y (o yielow.
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 frea/e v*bbl)cm 3ix (gu ig1re,w,.) yznely in a vacuum near the surface of the earth

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.11: The accompanying graph de )l/kctc-0jw kj+(0t go(aqspscribes the motion of a marble on a table top for 10 seconds. For which time interval(s) did the marble have a negat (t koj)pwq+gl(/acs0-k0ctjive 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 grap4y+bjyjy/-k;jud q ln1w ) /knh describes the motion of a marble on a table top for 10 seconds. For which time interval(s) did the marble have a positive acceleratiy n4n b-j /udl/1+ykwy;qj k)jon?


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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 max1d,1 kd rr mlw3qpj9+rble on a table top for 10 seconds. What is the marbles averrkd+9j xr 31p1wm,ld qage 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 uniformlr+ed:p iy;ta 4xz3xb4y 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;ryva qt0i+7lzh; *n64h ow hw straight 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 followingl:4nz;hs 61vyp .xd7x b s8dia graphs could correctly represent the motion of an object moving with a8ap4h xndl17vxydi s:z.s 6b; 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 motio-68;zo6c m xuvw//lkcim xjv- n of a toy car across the floor for 10 m6ul xkicxm6/oc/-vjv;- wz8 seconds. What is the 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 d6ae.bd*/ ffmc jc;j)hescribes the motion of a toy car across the floor fo .ff ;e/j hc6)camdb*jr 10 seconds. What was the total displacement of the 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 the motion2bl rk+c 5uuk ul:+m+u of a toy car across the floor for 10 seconds. At what times or time intervals must the net force on the toy car be zerl+:u2bu+ck u lku+5m ro?


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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 km/hr in 4.50 s. Wr0 1rxvk*c)na hich one of the following choices best represents the accelerkx )rrv0na*c1 ation 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 cu,ax qhd a8n.t*0 hfdf;.9 ggfe g3y4kkrve shown. Which of the following statements regarding its motion is NOT CORRtkga a3.f; defygg84dn09hxkq,* .h f ECT?


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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 accordin, r1/pxcal 45ksw0gy o8empt4g to the velocity versus time curve shown to the right. When does 8p0 x4c,/1oaesw4pg kymr5t lthe 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 z,)id6ykj2tm d3g ub35i- fuctennis ball is moved so that the angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true about the tennis ball during this inter- fkbz ,dc)2uyum63g itdij53val 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 1cv,y . b*b/oybb,9n2. dspidc50 kilometers apart and traveling toward each other. b n. .y2c *y,svpci9b,d/bobd
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 posit3i m7ra-frx*qm 0*e bfive and increa re0f3*mxi *-qr7bmfasing

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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 velog33ynl 7(acfcn d;.fy qk.yy2 city 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 following choices ide+mj-l*/y-kuyo6r6 nck g-mm bnti-c*-yn+6ogr6- ku myk/j mb lmfies 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 moveu+hfj ;i.vhm; s $3.0\;m$ 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, e 3 ko2x( -es7erkf)37 gmjrnot35yanec*vq, $y\;vs\;t$, 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 ty0d3 b 9zog6dsd2ca)yo the right along a one-dimensional track for total time T in tw2o06ygs da ycddz )3b9o 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 straigp2 8c1w 9 fas)wl5xlyeht track is shown in the diagr )fe59psaww2 cyl1l8 xam. The thick 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.6mqny +h-5yor time graph for the motion of a car on a straight track is shownr 5mynoy+6q-h in the 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 position vs. ,cpw//ea v2siy(em 41 wtn 7kypg7bt5 time graph shown,bpwi( s5y1tn/ep74wmg 72e /a cvtky. For 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 given by the velocity vs. time graphb+9 3nccx*eofifp w :, showncb:e, n9ipf *+xfcow3. For 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. time graph for a fixed 8o73h* l z7slpog;oa8 l/w kzrl56flhtime interval 7;3/ zo ol7* k5 f8szarlh8lwo6hplglof 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 horizo/e078ko3 pscetrarbo,fo r(;k)+ aii ntal 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 pafyj zx,. c)pe5d;riq lx*0ms1rts:
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 relea x)a xi(0ym. 8hgh0nqnsed 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 fromz9 ( zig+toeqar+8 :we6p wdw, 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.t lcy rx hhntxlko49 : 0+kz9kjq3g(6 yhp((z: time graph of a particle moving along a horizontal axis is shown. Whay j+p9n6y h(xk 90:lc3tr g xkkl4o:tzz(h(hqt 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 the following choices correctly df)ypa3g;f5 h identifies all of the listed situations for yfa5 dghf;3p) which there 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 mogj0nw,) *jgji ving along a line is shown. The object starts from rest at time t=0 s. At what time(s) does the object attain a mji)ng0* wgjj,aximum 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 i/b;m)tmt 1-5 pkyvpjats velocity along a line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of time for whip bkm;yv j1/p-t5 mta)ch 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 thkqyj 37t dq 3zec 9,vc..x5ybqe right on a horizontal track, each with constant acceleration. At an instant of time, the information about the car353j t9zbc ., vxqc7yeq.qkdy s 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 ab,pip: 6bwhl k)u0 av/ h6dc;b 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 showntw.:oy p/th*- zem zgg6 p)dr6 in the graph, which one of the following choices correctly describes the relationship between the average speed of the truck to that of t-pz w g/:)z6e y*d6gto. hmprthe 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 describes the instants of ito)23 uz,y5z e to9u9mhj9hd time, at which the car and truck travel with the same,t)3y2z 5ij9mu99eo uz dothh speed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.30: Two cars P and Q, each start from rest at the origin9cbmigoj,m0.6 vvnx4 and will move along the x-axis. The acceleration vs.vgmc0xm n,vio6j.b49 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 vs. time graph of an object moving on yo)caga v8n jxk1p4t mt,5 o+5a horizontal line is shown. At what time(s) is the object moving with its greatest spgv4mcox5ktt a8a,y 5o1 jpn +)eed?


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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. ti)opcd 7g8;i t s;4wh*lo-cv vmme graph provided. Dp- 8chdos)itv7c wl;o4g;*m vuring what time interval(s) does the mass have zero acceleration?


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