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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 a circular path of t4;wodg7 ojft2mm v ;f55g4ntradius $R$, 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 *3 7nvh*hrno zcv(i:mjlf- r *a particular directvf:3 * nlrjhvi7-hrnm (oz c**ion 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 angu.uv rc/f6p8ik) al(j:ti*g average speed of 50 m/s and then completes a second lap atiug jv:a)li 6ptr .*uc/8g( fk 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 velocity. Ip aw8zs(o6h3ob 3v(m:h g:axh f it continues, how far will ithz (h sxbvgwp8oa (6:o:hma33 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 2 h5qt bpn+i; 0zwce(r30-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 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 thez hc(ir; bep+wtn025 q 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 kmkci*9 irvm 4k3/h and 400 km at 100 km/h. What is the ave 9k*rckvii43m rage speed 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 refetbl2y3 6uox 7prs to the motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s vel 6o3l7uyb 2ptxocity 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 mfw)t 5:vb-hn zv2aa8 totion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the x directifth-v5avba)zwt: n2 8on, $v_x$ 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 refq oo:axh3jm97s1/:nswiz3awvrth(;8 m0v rqers to the motion of a toy car traveling along the x-axis. T:(s ha7otom w9wq/j1rvnrvz03 xsim 8qh: 3a; he graph shown 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 velwfk *r-iz9 2sqpah4 t*ocity vs. time of a duck flying due south for the winter. At what point did the duck stop its forward motion? ip*qh9* -fzwrta2sk4





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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 diagrv+ b*r2)u gi;xeb ck)sam below which shows the position and elapsed time of a car starting from rest and uniformly acceleratingg* c) s+ u;bkerbvi)2x in a straight 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 refc kw.qh 30(1:csxzgt mer to the diagram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in 1hm. k3 xcctw0 sqg:(za 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 an object with the pos;c6te8osq r )jdp /a,oition time graph shoj op 6 qsd,8/r;)etcoawn 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 informationp eh4fwk08j(z41hxti-v v zv;. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floorkvi;v 4fxw vpj (8z 4hzh1et0- 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 following information. An ideal elast m hb6bs,yxrmt85nq6+ic rubber ba 6,bx 6q8t+bhys5nm rmll is dropped from a height of about 2 meters, 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 speed ou2+6x;u -suz6brd vxyr(x 4spf $v$ 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 followwec0c*r - *vbuing 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 2mrliy*h4 0k,hpsil8 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 refers sncl1b mhg,0: 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 sce2lxj1 tic. qh0nario: 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 ai 301ehl fd)nz ramp, across a horizontal table top and off the table edge. Which of the following would best represent a graph of the magnitude o ei31lfh0n)d zf 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 distga37wsixixy01s1f y/ ance and time for an object that is moving along a straight isi1y 1/3gsyawx0f 7xline. 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 relationship between distance and sxzk;+8+ ouj btime for an object that is moving along a straight line. Between what times did the object have a non-zero acceler b;k+8z s+oujxation?


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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 do;jc5x ( -radbbwnward on Earth with an initial speed of 12.0 m/s from a position 10.0 m above the groundj-a(r ;bd5 cbx. 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 uniform,r(qbe3gn;dr a9 z3,b nul0 esly accelr,ebg b;0zqa(r su,n9 dln3e3erating across the floor. The time and distance traveled from the start are shown in the diagram.
What was the average speed of the cart between 0.1 seconds and 0.3 seconds?


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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.12: The diagram below represents a tkjdh6 yf ctsd+( kw;9f7-po/zoy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start are shownzcwk9y+d pd /7t(j-ff h6o ks; 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 ur43l/:v1y xo vcq;mw;cgh l9toy car starting from rest and uniformly accelerating across cm:qvl/ly3;xh;9w ou4g1v cr 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 accelera43k 7gugv qc-89i qqfating ball. The position of the ball each seconqg9k qu- ac78fgv 4iq3d 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 uabp-* nph9s2z-vwb )f niformly accelerating ball. The position of the ball each second is indicated*sf z-hp2-bwpbv)n 9a .
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 movinh)s v 56)no+b j5pcssrf nzq2xm2(gdq d :4mm+g in a straight line is shown i)6x5n 4 hs+m qrpm +d)bn jq:d(5gsszmv22cfon 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 mox-r,6o gnof0uv1g olntss,28 ving in a straight line is shown ngn6u0o, o 8xss-f tg21l ,ovrin 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 fre /rc x3,w p+oz2im9z rsodp1ky ;(q.vnely 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 accompanytg pxtlpr 2kyb 46rjm8-g0;ix: j(f*king graph describes the motion of a marble on a table top for 10 seconds. For which time intervx0( gr*m2jxt-;gj rp8kfpi b:lkt4y 6al(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 motion of a marble on a tablr: tqnz55k 6yle top for 10 seconds. For which time intervazrn5l6qt: yk5 l(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 accompanyinn;x5zdp7msr +7u9 o6 plmtt.o- esz l2g graph describes the motion of a marble on a table top for 10 seconds. What is the marbles averagl7 +o n9usmpl7-t sx;ozzet.5d2rp 6me 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 from rest for a time ofh*yu/1dk 4nn3oao a4p $2.00\;s$ 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 w/lqpfec) wq7 x -;lzn0 t,,gyaith 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 graphviyf6p4a 3 ,iu62hgeqx*1ac hs could correctly represent the motion of an object moving with a constanta 1 ghce6i,3 *avquf6xi24hyp 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 gp4ok6a8- wec *yhf.a craph describes the motion of a toy car across the floor for 10 seconds. What is the accelerat.ya6f4e*wcph8c a- ok ion 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:p0 kxx ql4a(p car across the floor for 10 seconds. What was the total displacement ofq: pk4a xx(l0p 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 motion of a toy car across kx47gc4ly uge/hm* 1 dthe floor for 10 seconds. At what times or time intervals must the net force on /hxem4dl1c4* y ggk7 uthe 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/h1is2 xyrr8ozo /6aw9/ q mmyk8r to 60 km/hr in 4.50 s. Which one of the following choices best representsm8wyo6m9s zyaqi/x o8r2 1rk / 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 time9 iag9 *b xv.-6yoxczf curve shown. Which of the following statements regarding its motion is NOT CORRECT?oza g-9vf*x 6bicx.y9


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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 tjk1 l m.270;rvzehn iversus time curk; 20z. lnhive1r7tjm ve shown to the right. 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 i g 0ou20efmb h8./bdftennis ball is moved so that the angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. ff80b.0bu h/oe idgm2Which 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 aivb1(it9 7ni spart and traveling toward each other. 9n i7(tsii1vb
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 posin lspgqas(* 7 s-ygu0*tive and increasil7a0p-nggu qs ssy(** ng

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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 ofqp 9.3 t*wwe4ys .vsr wht-mo- average velocity is

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.18: For any motion in two dimensions, which one of the fol8ixo q- 4d xrop:4rw1ulowing choices identifies quantities that must h qrr 8w-4 doupx1:io4xave 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 move5*fxq,tq ; lh7yhu2j is $3.0\;m$ 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-k hyj6ytzf1yl *9wj kb59n l4 p4-ulg)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 right along a one-dimensional track for totauf4td tvo8 ;;jl time T inotuj; f8 dt4;v 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. tim+ n,mo7qg8ysme graph for the motion of a car on a straight track is shown in the diagram. The thick line representmyoqs+,mn g87 s the velocity. Assume that the car starts at origin $x=0$. At which time is the car the greatest distance from the origin?


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.24: The velocity vs. time graph for the motion of a car on a straigm)g 8ab5;-n o lqu1ospht track is shown in the diagram. The tl)an q185smuo-opb;ghick 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. time graph m:0f(c. nb7cnov+fw (bz8 gigshown. For what time(s) is the speed7nfvcomz: ib g8gfb (+c0w.n( 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 ( dlf q34j* 5tjstlth7by the velocity vs. time graph shown. For which time(s) is ths7f*jd qjl tt3t4(l 5he 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 thehm9)3ex+e0ctaztx , f :bklr ; area under the acceleration vs. time graph for a fixed time interval of an object’s motion, what quantity has been dete; lktae,t:exr3zxh)9m0 cb +f rmined 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 horiw*0 ne8tqd+eh zontal 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 0w;h(63 e4wa aqeackgtwo 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 is released from rest and reaches the k5t- 8aqlezb(h . cohuc.;mn* v*ew3x ground in a time of $2.50\;s$. Neglect air resistance. With what speed does the object reach the ground?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.03:A small object is released from rest and reaches the ground in a time ) e/mjyc bd-zat ,(l6hof $2.50\;s$. 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 horizw7*+2jsscb zi ontal axis is shown. w i2*+jszsbc 7What 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 identii-)f9d9r: gn0xa6gvu wd cj4 pfies all of the listed situations for which txv0f9dw 9i-rgg 6ua 4pd)cnj:here 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 along b 7kpx6)5n19 eg3 szxoiki*qoa line is shown. The object starts from rest at time t=0 s. At what time(s) does the object attain a maximum displacement f pxoq79i)gkkb xz1 os5*6ei n3rom 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 sta0+ /ehxt h(/p+oxtorihu 8 1fgx3onav3j.u v ;rts at the origin and its velocity along a line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of time for which the objec hxvo+ 3+ nof0ju.i;t ugeh3to hv8(x/p/arx1 t 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 horizontjbo72-l q;x vpal track, each with constant acceleration. At an instant ol-x2 ojp7v q;bf 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 positionv.;8j3fak6efjiah:2 2/ pl.k j wheat $x$, 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 t s(5( e:ni*nw.wfnfa time shown in the graph, which one of the following choices correctly describes the relationship between the aw (:wtnnfni 5se(f* .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 choices zcb a+ l;z3ven l:yq xz +0*dg3kob7/ibest describes the instants of time, at which the car and truck travel with the :eab gcx/il3 zzo yk7b*+0nzlq;3vd+same speed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.30: Two cars P and Q, each start from rest at the oriji t9 2mf-0cq b1 vkjq)* ,fvq7xu7.hvahg6sigin and will move along the xvxtc*sv-. jqhuf)6 bfvjg90k7a1h i2 ,7mqi q-axis. The acceleration vs. time graph for each car is shown. Which one of the following choices correctly identifies the relationship for both the speeds $v$ and the positions $x$ of the cars at time T?


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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.02: The position vs. time graph of an object shug6( h ukzy5(x c9h)moving on a horizontal line is shown. At what ti9hsguz6chu ) ( 5x(khyme(s) is the object moving with its greatest speed?


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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.08: A mass moves along the x-axis following the position vs. time grap+t6vl o jr:q 6ro5qm9a26rjl yh provided. During : m9t2a6jorr 6lylqjo+ rvq56 what time interval(s) does the mass have zero acceleration?


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