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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 z2e iwmw.v 48gspeed 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 8m7:*wyw5u mwpcn9ju-alk/w reference to a particular directionwn 8-l cau/mypj* :w 95wwmk7u 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 hafts 4jthiy(1;)u+i ;gh vzch: 1* uta circular track at an average speed of 50 m/s and then completes a second lap at an average speed (vht+y gihazhcu 1; *)fj4s hti1: t;uof $V$. 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 thef7n0 x1 dz ( j7j.ltq.i/-h mrnv5senw constant velocity. If it continues, how fali mnnrw( q j. tnf j/-1x5ds.h0v7ez7r will it travel in 3.0 s?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  05.34: A 40-kg boy is stationary on a 30-kg plank thh,a oy9 td,2qoat is sliding at 5.00 m/s to the right across a frictionless pond. The boy then turo,29yt, dqohans 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/q 8yo *e3)34ntfp2y +nhbibk jh and 400 km at 100 km/h. What is the average speed of the motorist of tyq)e8np3 3k *n+2h4bybijon 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 thsr +-tt)gn xwzkqs+:+uyb 3:ne motion of a toy car traveling along the x-axis. The graph shown below is a plot otns)u+q g +yb: xk:tznr+3-ws f 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 moticwtci 3jm p;8uh .-7eion of a toy car traveling along the x-axis. The graph shown below i8jh mc73iwtpu.i;-e cs a plot of the car’s velocity in the x direction, $v_x$ versus time $t$.What was the acceleration at 33 s?


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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.22: This question refers tfc6c z lfh1bb3 g.0/pao the motion of a toy car traveling along the x-axis. The graph shown below is a ./b 01gc6ba lzhcfp 3fplot 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 4 .clcbmbsd s(uw2 2ztc;9 :tvduck flying due south for the winter. At what point did thev 9cd;tst 2: 4.buzlcc (2bsmw 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 and elaa5eu 4t 6a-d3iot o;ispsed time ofioa46sdioeta tu3;5- a car starting from rest and uniformly accelerating 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 refer to the diagram behygit -)hnosdj93kz)3 .9z xxlow which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleration during the entire 3 second interval is clos) y.hg)x hxi-z3d99z3njt sk oest 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 graphwqewv:gw*elf:( m,y4l 2 j kx: for an object with the positionxg y(wq,wk :j:e2m:v4 flew*l time graph 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 tu:0hgxz5 r e*v aj2b9hhe following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits t2ubejzr5*ghx9v0h a: he 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 followin+bm.(n xfcybq18tu -1yrmy 1rg information. An ideal elastic rubber ball is dropped from a height of about 2 meters, yrxq8(.bmy -fr nym+1ut1 c1bhits 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 wqr 7dn)y t1ly:b41rpkith 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 scenarioluo c omhk :h.25v-n(v: 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: At j8wnr +dsh:v+ c2qo:u$t_0$, 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 rv;g r dh7h/ 6s8+xztid)e-xgthe 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 to :h5b,0omki tbl dd02uc*bi +he 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/w u8njxh 4hom+ 3z3a3zzwnk6 horizontal table top and off the table edge. Which of the following would bes34z/nuhoa38 wh63 k +znwz xjmt represent a graph of the magnitude of the ball's acceleration vs time?


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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.01: The graph represents the relationship between distance and time for g5efj cmx7btn* 7vag)i 2( 3jaan object that is moving ng(t x jciveg)afab32*5j7 m 7along a straight line. What is the instantaneous speed of the object at t = 5.0 seconds?


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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.02: The graph represents the relationship between distance and ti. h vgdo,)ifz+ u m7+;;plgoakme for an object that is moving along a straight line. Between wha, mlo;hg7fa+igk .)p;du+voz t 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 with8f2- rmpvpmsn j r*nst ejz*:/+9qv, a an initial speed of 12.0 m/s from a position 10.0 m above thejfm*vn 9-es+pma r2 rzsp/,t:jn* v8q 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 toymtk s 1nrq2v p5ndfw4h9l -*)rfmi3d9 car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the sta imrqftkdw-v ) n4r9 5d n2fs3hp*m9l1rt are shown in the diagram.
What was the average speed of the cart between 0.1 seconds and 0.3 seconds?


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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.12: The diagram below represents a toy car starting from rest and uniformly 1 w htzwg9pov22*h 0nyaccelerating across the floor. The time and distance traveled from the s0yh w1hgno22 9zwtv*ptart 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 fr4zmy3l6chu x+6 / tuvxom rest and uniformly accelerating across the floor. The time and distance traveled from the startu 3xzvx+y6 m t4culh6/ 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. Thea 8uhjhs;,:ch 3+i/ vfcl*acg position of the ball each second is indicatehc3f/hl ivjccg;h 8, *+u :asad.
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. Thy ; n- ,zh:gw,aya;u(qumxav 0+mtr ajhw (i33e position of the ball each second in a (iay,,ju-x+;qw;rthmmwgvh 3(y0za a: 3us 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 m 7qv-ci0.g-ufp g6;fl zvkin;oving in a straight line is shown in thzv7gk -qfcii6f;nugl -.p0v ; e 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 unixjszaiesoj :c h e+g-7.5t(+h cycle moving in a straight line is shown in the graph below. hajs ch:.ie+ so-+ zg7j5txe(
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 thertyh7 eikbt*hr1n7d9 c 4: .wh surface of the earth

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.11: The accompanying graph describes the motion of a marble on a table tomg scr1,l z1v3p for 10 seconds. For which time interval(s) did the marble have a ,rgvsm3z 11lc 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 1k1pp(c jl5h-i/ /x vptb o)ubxou13ha marble on a table top for 10 seconds. For which time interval(s) xlt/3 o- p)uk(1xivpph/ou1j1hb5b c 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 describ7 uod8)zqsad7 9n3+ jz c6qydaes the motion of a marble on a table top for 10 seconds. What is the marbles avera)cd63n s+q a8j7o udzqdyz7 a9ge 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 wr. 7rrf8/)dd1umzcwjr; pc 9rest 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 with a speed . klz0p*(zbtb dp 5:xjl6g8xf 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 correc bw+y2y:+1c4gayrenmyog ;e uk1u2rzu*1x s: tly represent the motion of an object moving with a constant speed in a straight linu : ouu2sg2rgrmxz k:nw*;y+y1by ec1ye4a+1e?


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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 acroeqasu7:kmm 147w fk.t ss the floor for 10 seconds. What is the accel wm es.t4qa kfm17:u7keration 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 mzq.w:i pbz230ue d9ncotion of a toy car across the floor for 10 seconds. What was the total displa be qu:icz90dn3p .z2wcement 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 descs m)qswirerht2*)p* ; bv7.axribes the motion of a toy car across the floor for 10 seconds. At what times or time intervals must th p sim;.2t*a r)* rb7)wqsexvhe net force on the toy car be zero?


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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.03: A car accelerates uniform*d8p(itz2ii cllt b9g*r zf *:ly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best represents the acceleratioirt p*:l*bd2gi (f89 zczl* itn 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 fo:q:zb-d)g6egjpn ( 00cmst yeixwz 1,llowing staiszg) 1epex cdnbtz0m q-w y,6:(jg:0tements regarding 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 along the x-axis according to the velocity vek,vkui, 2 kwk6rsus time curve shown to the right. When does the car have zero acceuivkkk2w,k 6, leration?


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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.22: During an interval of time, a tennis ball is moved so that the angle bpl)+(dravf4j ,v,ev ay-r4gqetween the velocity and the acceleration of the ball is kept at a constant 120 degree. Which -lvr4a qva,dgy,v rjpf e+ 4()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 an*w267krc j-.e4xoo o ;dq4g a2yupfhsd traveling toward each other.7acqoeo hx2ygp*dw4;6 42o. r jufk-s
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 6ttoy1o:nro: f i8w; 31belpk0ir/f n the x-axis. When the acceleration is positive and incrtite 6 ;:0:lfk1ry/nbp1 8 fn ioowo3reasing

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.12: The definitionq+)8i , dazau:m9 evnv of 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 the1:6-k5y94dz n g ofmhi6hswdcpe0 zx, following choices identifies quantities that must have the same direction 5n z6fomg d0w 4yc6hpxkz1-is, :9deh?

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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 uow,bu) 4e eia.7d;gyy5p rn, $3.0\;m$ 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, mba2 z f6:3hgqf dy3 wdj((5as$y\;vs\;t$, 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 56twl y)3yx eafor total time T in two part5)3w6 eaytylxs.
• 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. ti 6rlwa0zwe)o9me graph for the motion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that the car ez)6 rolwwa09starts 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 trac yss+rgafw6.(u0e/1v 8klfqlk is shown in the diagram. The thick line represent+sqg f 6v 8af0ul/s(k r1ye.wls 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 posii7k rz4 081oq)qkzgbtci 5)ih4vpf6btion vs. time graph shown. For what 75fqzbr6k v14 ihb48 tgqi0k)oizpc)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 objectmjl ixr6j+pb2 c2 73/9bu vywi given by the velocity vs. time graph shown. For which time(s) is the acceleration of the object equi 76rxcpb2vwj/lu jm3i+y2b9 al 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 acc yj3 6srlsz ql(64awc+eleration vs. time graph for a fixed time interval of an object’s mot6 4y z+3s(6lqscljw arion, what quantity has been determined for that object?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.08: An object moves along a horizontal line with increasingo4:s q (h9 d:wvg9zcc emt-32nmyor4o 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 .fqk:yz5i kdjv qi442in 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 is released from rest and reaches the ground in a t8ywu( p :ez sdhzc:sdi.+4x: gz95kt fime 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 releasedn 20g9atg vj-wgf19ex5bg- uo from 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. tim/ hhw1z r4;kbny( gc4qe graph of a particle moving along a horizontal axis is shown. What is the total distance traveled by tw4 gnhbczq4 y;/rk (h1he 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 aywe.2u dxut-c/ 5het0ll of the listed situations for which there is a non-he02t.t5 -yuc/ed xwuzero 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 alon cq5dv 1)i 9bhzgc3t3eg a line is shown. The object starts frt cq33 ec9g5 )hivz1dbom 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 aloqe7-ue c9b x4 q4k4vnx4e8q m5fr mks2ng a line vs. time is graphed. Which o82xk4qe4uf54qmx-s ece bkrq vn 94m 7ne of the following choices best gives the proper interval(s) of time 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 right on a horizontal track, each k;d /aawe(fl9with constant acceleration. At an instant of time, the information about thew/ el ;f(ad9ka 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 aduh ejdp3s ,.(ga2,d a 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 sh0od(r g x oh6+dke.6w8xkx.vpown in the graph, which one of the following choices correctly describes the relationship b +6o ex.p8gx0k(koh.ddvx6rwetween the 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 best describes the ifko ptlh+2n ;d6i))fdnstants of time, at which the car and)i 2hn;fdkt)p lof+d6 truck travel with the same speed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.30: Two cars P and pz,k4(g.fu09x6dcxjx h + ijy Q, each start from rest at the origin and will move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the following choices correctly identifies the relationshipkg0pfz(.9jj 4xihd y+cx6,x u 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 v( 1z(pwr awga (ys(:ut6fishufa;-- bs. time graph of an object moving on a horizontal line is shown. At what time(s) is the object moving wia(hyr:i 6zt-p-(;w sbus(w (a 1 fgaufth 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 pz* 2z) xt.-icu9xumh svzr1 o-osition vs. time graph provided. During what time interval(s) does the masth9u*vmz zs)-1 -r xz.ciu2oxs have zero acceleration?


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