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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 radius.wcw 7zmk a9-o4nln tvrv;. 1y $R$, 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 usod4ycjgga 9 (e 5.*7s+ohlkcnit time without reference to a particular dirkdjg(l s7*og4+h.cc e9o5aysection 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 2 8bia;zs3n( +82xivm cwcfd )ghf:qyaverage speed of 50 m/s and then completes a second lap at an average spee2:(iicnx sgm 88qayzbc h2v;)3wf+f dd 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. If it -c 1d8/,e knxru0 ( siq3uym,qhxbv4 zcontinues, how far will it sqmz1-8,u3 ,vex uhcdyk 4i/br0(nqx 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 stationary4 za2vwrs,:yo on a 30-kg plank that is sliding at 5.00 m/s to the right across a frictionless pond. The boy thenzavs4,y2ow r : turns and starts walking on the plank at a rate of 4.00 m/s to the left, relative to the plank. What is the speed of the plank relative to the pond now?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.18: A motorist travels 400 km at 80 km/h zxewszlserycc,je . 5q7)32cz ).t q2and 400 km at 100 km/h. What is the average speed of the motoris wqcs2)s l)xz z3jqree7.ecyt,52z c. t 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 referht3l uw qyj)2/:mp d0is to the motion of a toy car traveling along the x-axisd w2ptjq:0lu my3h )/i. The graph shown below is 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 motion l(to8t uc : bk2bvv/e8of a toy car traveling along the x-axis. The gr82o8k t:/t lb(euvbvcaph shown 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 questionnwux gy n4wx55 0t7k5w refers to the motion of a toy car traveling along the x-axis. The graph shown below kug5x 5nw0xw4wn t57yis 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. ti .xxmx4 kr 0b0(j6tcqeyys1 d8me of a duck flying due south for the wixjk0q8 (ye mxbs4.y cx01r6 dtnter. 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 below which shows the position xo: 5u( .zuzooand elapsed time of a car starting from rest and uniformly accelerating in a straight o .uu5xz:(oz oline. 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 diagra:gj .jwudxxj*( (prazp vn 6e;62ha6 am below which shows the position and elapsed time of a car starting from rest and uniform 6:2zud;awng(( hjex v6p *j6 jr.paaxly 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 an object with the ponga6.j0-t v ue12l prwsition time gtn jvugl1r 02.ewa6p- raph shown 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 followob2u(nzf d5 +vnx + y,xye6jc-ing information. An ideal elastic rubber ball is dropped from a height of ajb5n2+ce (n-y6ux , z+xfo dyvbout 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 following information. An ideal elan/ybl2ptc)ax df1 a9a5 l .etujm -6sdtd3/(cstic rubber ball is dropped from a height /2)dp tu( s/d6913e cldc-an.a jlyftxtm 5ab 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(yl,f h o5m e4fxr)xj/ 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 followinov ag3xv7 vzf7zjz3 sm4 r/:t:g 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 rs+ ji m5n5m1teefers 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 refers to the folba,odlw( :l*/ pa2vhc 4c+ rfplowing 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 refer*7t9 dojkw g -zbv3h4ts 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.
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 :j fjomzxo n2-c+pgtyf+a 6:; g:vwp 8horizontal table top and off the table edge. Which of the following would best represent a graph of the magnitude of the o:x8z+f 2t pap-j+cwn:;m: 6ovyfj gg 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 relatioi0q 7aom dw;njp8c7 z8nship between distance and time for an object that is moving along a straight line. What is the instantaneous speed of the 8w7nj mo ;pqa8d0izc7object 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 relationsha1vpp9mu nq2-p e.9muip between distance and time for an object that is moving along a straight line. Between what 2mpe1-qppmun.v9u a9times 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 mp if0a2gnfl+/a1.dt2)l qmwj4xz ;d on Earth with an initial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resistance, the speed of the object when it reaches the groundaz ./i w2jnx)m;fmgdl2lqtf1 0 d+ap4 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 and1)y m7 iw-w/ wva4b0 adzku8ze uniformly accelerating across the floor. The time and distance traveled from the start are shown in the diagrawvz-e)7w imzd8w ubya/40ka1m.
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 uniflb m(nf4z 7+cnormly acceleraz4 7fbm( +nlcnting 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 represents8 kycl3:du- hx1 r-srib7y vm ed5k4+u a toy car starting from rest and uniformly accu-hrd dxl k8uy i4rc5:y1k 3-vesm7b+elerating 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 ballsnjlr ty9o,;f paz ;(g8 e*q3h each se3 g t;zqan9f8l sj(rh,e;*yp ocond 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 theu:b ud+vg,jd u5fs/c5 ball each second i 5jg:ds5uu+d,vb/f u cs 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 in a straight line ifwrx3q9m ,4gf,m /snw s shown in the graph below. sg /w3fmm 4rw n,9qf,x
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 lit0f;5i g *cqdiqbe0w+fv3xb:ne is shown in the graph b* fweiid35gcx b qt0+q0 b;v:felow.
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 vacuum near the s 1 xzp865l,h)a7ucla)nqh n zj:b4qmeq* t/ guurface 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 wqbxwp g enc439,-e)za table top for 10 seconds. For which time interval(s) did the marble have a neec4q wp)g xwneb z9,-3gative 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 descgx df;4 ,l 3heik-sgs4ribes the motion of a marble on a table top for 10 seconds. For which timedfs i4,x-gsh ;l3eg4k 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 mot5s szex0 t73c bz;d;kl0 kh7v (lktlf)gqme1 5ion of a marble on a table top for 10 seconds. What is the marbles average acceleration between t = 3.3 s and t =g) 7q;7cksf0lkthle t5z5dx1 ( z0l3mskev ;b 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 fo g0z 22man,hl4a idy;ar 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 down */idxhg)uzuc6r 5(f jward 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 followixmahd;my g )48kf3r-t ng graphs could correctly represent the motion of an object moving with a constant speed inm) hxk4 t;m3rfy da-8g 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 6-m--f d88p3 bbnd juk dxu7lvgraph describes the motion of a toy car across the floor for 10 seconds. What is the a-fld b3md xu6- 8-n pd8b7vjukcceleration 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 carnd :,oorj1;r xndhd2i ind146)s 5jft across the floor for 10 seconds. What was the total displacement of the th;f241:nj nddi1 jdr6d o 5x,o ir)tsnoy 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 des/gy;5+*z jd.w i)z g8rzfq ltscribes the motion 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 5yj )gtgwd/+ zfiz;lr z. q8*szero?


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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 uniformlq0eqi v tlyhv (e841mo-.3dpdy from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best represh0-l1q .itd8po34yvemdevq (ents the acceleration of the car?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.07: A car has the velocity versus time curve shown. Which of the-4q)h* sr8cpbj t s0e s8ow1og following statements reso 08-1)jshcpqsg8*4rwbtoegarding its motion is NOT CORRECT?


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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.17: A toy car moves alonggwzlqw qi m20uo,z /-5 the x-axis according to the velocity versus time curve shown tz5 m q/gwlq0wz2-i ,ouo 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 tennis ball is moved soi2zm a4je)2 +4oketkl that the angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which staatmeeio2l4 2kzj4 )k+tement 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 aif9jk8;e(o ji ellb0*q rpr/-h zvp/ 0nd traveling toward each other.pvhk0 ljfe 8i0 (pbq-ire* / ;oz9r/jl
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 th.myo-z f t8x1he x-axis. When the acceleration is positive and increaso8 my-x1tz h.fing

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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 aver-4hbtuvi/4+ by2 mywf ef5hs0 age 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, which0 uyopl:kw v* *it6ty; one of the following choices identifies quantities that must have the same direction?;6typ*tk: wuvol0i* y

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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 mov + jl-n nqloxl8t4z;ui 9v*mv;es $3.0\;m$ 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-timep -kwd,ekmlxu1b; )5j7*tna a, $y\;vs\;t$, 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 to32zfd enixupc1a 32 (w the right along a one-dimensional track for total time T in twp fz2n31c u(xa3w d2ieo 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 the4)e(r2d tp sl e8 sjl,uj6qxm4 motion of a car on a straight track is shown in the diagram. The thick line rep4rl jqej),sl4 ps86u ex2(dm tresents 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 straight sjn; tl*5gy.is v2 vv(track is shown in the diagram. The thick line represents the velocity. Assume that the car starts .yi2(j g stv;vns 5*lvat 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 1j3crs 2o( t;nm( -b a2xknolfan object given by the position vs. time graph shown. For what time(slot3; smkarjon2cn ( 2fx-1 (b) 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 b+n m9l bbpy:o:y the velocity vs. time graph shown. For which time(s) is the acceleration 9:o+myb npb:l 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. y+6cw aim*v7 btime graph for a fixed time interval of an object’s motion, what quantity has been determined for that ow6b y+miva7 *cbject?

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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 spap h,(rnb2l x7eed.
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 sodxy1/smj4 b if;4)x 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 h5nwf-y( 8w b7nhav( nfrom 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 fromi dokn1zloc gbb9or 17l00))o rest and reaches the ground in a time of $2.50\;s$. Neglect air resistance. From what height above the ground was the object released?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.17: A position vs. time graph of a particle moving along n*hv7g +d+dnna horizontal axis is shown. What is the total distance tr+dg +v7nnn* dhaveled 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 of the lcj-poq/ k(i0 aisted situations for which there is a non-zero acceleration?qock-p a/i0( j
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 alsgqtv 3f hvu/ 0j6m5,qong a line is shown. The object starts from rest at t/,vjq 6q5gu vm h3fs0time 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. ti8xth7m x q2l:u/xid /ime is graphed. Which one of the following choices best gives the proper interval(s) of time x l2ii7xhu/dm8qxt /:for which the object is moving away from the origin?


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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.09: Two cars are moving to the righgb 9 j .5tghj6jc4xc.at on a horizontal track, each with constant acceleration. At an insta htj6c gxj.b.94a 5cgjnt of time, the information about the cars is shown:
Car #1: position = 125.0 m; velocity = 13.0 m/s; constant acceleration = $1.5\;m/s^2$
Car #2: position = 80.0 m; velocity = 9.30 m/s; constant acceleration = $5.5\;m/s^2$
During the next 1.0 second of motion, which one of the following choices best represents what happens to the distance between the cars?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.14: A particle has 1lvnk2 )esu x2a 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 choictbs4 uy0 5)bm*/y kvhies correctly describes the relationship between the average speed of the tri0/* utv) yb4s hkm5ybuck 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 followi5sque5 stq8 y+,bht 3lng choices best describes the instants of time, at which the car and truck t5l+s ytu qh,tebs q385ravel with the same speed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.30: Two cars P and Q, each start from rest at the origin and 4 /- se/)fckjlwp 6x.gr2.hj2hci mrlwill move along the x-axis. The acceleration vs. time graph for each caj ksp2lx .rih6ewr h//gfl)m42c. j -cr 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 v5rkfmr(mdo:uatqew+36w x q *m ig955 s. time graph of an object moving on a horizontal line is shown. At what time36wr5m qm:(au kf+5i o*g9mrtqwdx5 e(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( z70flxk, akhmb-c r, x-axis following the position vs. time graph provided. During what time interval(s) does the mass have cxb m krk-h7zlaf0 ,(,zero acceleration?


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