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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 p*1e,knygrqj7xk u+ 2 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-n2pq8rcos6 b distance per unit time without reference to a particular directionr8n-ob 6cpsq2 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 ap6l.r, cpy, /dr wiuf, circular track at an average speed of 50 m/s and then completes a secondr6,cwuif,, rl/ .ppy d 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 do c6s9defz4yp805qs 0.80 m in 1.0 s at the constant velocity. If it continues,4fso0ydscdz 6q 5 8pe9 how far 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 that is sliding at 5.0hpco bkm3d ha y).)+i,d7 bm8q0 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 spee qi.mk,8pdmhod h yc)b7a)3b+d 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 trarwu-s+ny9)uru bk 2 -fvels 400 km at 80 km/h and 400 km at 100 km/h. What is the average speenu9-ursuy )kb2wr- f+d 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 refers to the motion of a toy car traveling along the x80qhaf*zj ry2 so 6ng1-axis. The graph shown below is a plot of the 8o0 6 rgqy sjfh*na21zcar’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 of a toy car travel)hdx 4y5e4gmlzhh6 z)ing along the x-axis. The graph shown below is a plot of the car’s velocity in4dhghlzyz)4x5 e h6)m 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 motb(hob+trpai x+x/:(w ion of a toy car traveling along the x-axis. The graph shown below is a plot of oxtw ((+/:rbxi pb+hathe 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 flyingh bkn 1z0oo2d 6qwk1o6.1agvn due south for the winter. At what point did tonabqkv 1ho.0 o n1z66 gdw12khe 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 refx h8xydb p/:k/er to the diagram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight linepxy: b/k/d 8hx. 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 which shows the position zg0l0 q l fha*zru8.c)and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleration during the entire 3 zr0u l0 zghqaclf)8*.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 witu;k4:pfb. u wsrq ;dy2h the position time graph shown in the diag:2b wf ;skq4p yu;urd.ram 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 information. 0h5/xlfy;omvurr faa (8 pb, ,An ideal elastic rubber ball is dropped from a height ofxbr 5af/fa0,or(8hyp ul,mv; about 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 qu t*gean+*s j+eestion refer to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor an+* jg +*aseetnd 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 of w sy5x9q)3 ira$v$ 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 scenario: A4pwmjthnjn 8*- wmpea5 9p4:g4tz6 snt $t_0$, 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 + /:grs5ujuxjg z3fcv4: gc5i: 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 following ,c5gmz3 d p6tm mvvj/j*.yeb,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 scenivc +4uvnge4fj)*h l 6ario: 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 *un narj 2/7:sbk * kglo)yx9mjfv) ur2x83oqa horizontal table top and off the table edge. Which of the following would best represent a graph of the magnitude of the fb 3)*u xrmjn2 7y*g8oxasknvk)9 jul qr/2:o 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 the9ums bm/u;s4 ehj4zkblr9) 1h relationship between distance and time for an object that is moving aluer)hm zmj99 4lbs/;h1 ksb4uong 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 r ge8mob61 u t d/wjogbmnh- 2;,aggo15elationship between distance and time for an object that is moving along a straight line. Betwetb8g51bn-mw /1g do u gaj g;o,emo26hen 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 ix dks)k0c*-been /gqyl)2 5shnitial speed of 12.0 m/s from a position 10.0 m above th 25h0dsyexckge))kl* b qs/-n e 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 represents4tkcq*j 6 epy tq4*4rq a toy car starting from rest and uniformly accelerating across the floor. The time and distance travelq*c kq64epqt y4r4j* ted 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 and unifor4bnqpx4 xu :2p0fl u/pmly accelerating across the floor. The time and distance traveled from the sta:4pf xl0nbup2u4qx/ prt are shown in the diagram.
What was the acceleration of the cart during the first 0.4 seconds?


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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.13: The diagram below represents a toy car starting from rest and uniformly jhcawe+)-hw 1w (x k.maccelerating across the floor. The time and distance traveled from the start are shown ha-)wmw+ec( w .hj1kxin 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 bi3j/0 +dxmo20v6qhvs4 qdgquall each second60gijvxo+ 40vuh2qd/q qd 3sm 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 sqci- (qn8:a2*w u* qxv g3qptfhows a uniformly accelerating ball. The position of the ball each second is indi c28 a*q:xt*pvqqn -iwqgu(f3cated.
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 clow/j5w e,1adofpb2eg( l )h0 nobn on a unicycle moving in a straight line is shown in the graph5ejdo /0 2gep,bobfa)(wl1 hn 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 moving in a s2(a.d;x+ afz 5lux okbmb1x(wtraight line is shown in the graxf ( zabkau+2xx1l.w o m(;db5ph 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 freelk:lpsjnn 1-xj :j4qr96i s/eky 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 describes the motion of a marble on a table top:i8o: tgjq l7sa we)2c for 10 seconds. :8al27qg: cewjs io )tFor which time interval(s) did the marble have a negative velocity?


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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.12: The accompanying graph describes the motion k-j(k ti +zkk3of a marble on a table top for 10 seconds. For whk(3jkz -ik+t kich time interval(s) did the marble have a positive acceleration?


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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.13: The accompanying graph describes the motion of a marbleb;ewr(e. o7zb on a table top for 10 seconds. What is the marblez(ebew 7b.;r os average 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 fro);sbo0rdvl p1m 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 st*t svo41p:ut3y7t yjbraight 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 following graphs could correctly represent the motion oy5 tu33xv/vf l)e 60mt lyigy1f an object moving with a con f5vi)y/ttvgx lu1lm3063 yy estant 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 t77smkntl w*v6 no(57pxsb;t rtw3 ej4he motion of a toy car across the floor for 10 seconde47w6jn5krtspmo xn sv;(l7*b t3 7wts. 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 describes the motion of a toy car acros:6;m8(rmhsm2 kl .pq s n9cnzjs the floor for 10 seconds. What was the total displacement of t.8nrm ;q mmh:snsz9pc6k (j 2lhe 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 acrosq5 u:n ., hyhjg;nugu7s the floor for 10 seconds. At what times or time intervals must the n;.yuh:g gj u hnn,7qu5et 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 unifs95 ya c7xj,j4xph6y xormly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choi74a j5ps 6y,yxhx jcx9ces best represents the acceleration of the car?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.07: A car has the velocity versus time curve shown. Which of the follozyg ac-x(jo4vrj83/mpa: l-iwing statementg o4z -al8cry:xja/v-p3ijm (s 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 versus time cd0 2x.jebf 0 ymw)zf7wurve shown to the right. Whee mfy7bd x2)w0 0.zwjfn 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 so that c/u2r b+rb7)wgg f+ilxr7i *+kb v*mo the angle between the velocity and the acceleration o7vlubcg/ )rbir+kw xf+*ig+2b *omr7f the ball is kept at a constant 120 degree. Which statement is true about the tennis ball during this interval of time?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.03: Two automobiles are 150 kilometers apart andx76pe xeqmuy*x)5 ;t p traveling toward each other.7m )pyxqee*x tpx5u6 ;
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 mov pb*d pm/63cppes on the x-axis. When the acceleration is positive and increasin ppc3mp6 d/b*pg

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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 velocitys(k y68j .rkd0kc*bjl 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 folloe)pq k 4f:h4dx nku51nwing choices identifies quanth4 qf4kn)up :ken1x5dities 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 mov.gc; -/pmnw-z;xxqkv 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- r0c-tpy0w 1j7vyi3 ohtime, $y\;vs\;t$, 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 fo 6:r nn;s6+ta+ro:s-rlq,elyxi tx k/ r total time T in two par/: x-nsekr +66:lslax ;intrtoyr + q,ts.
• 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 straightafl0*xp: yw;x :r -evn track is shown in the diagram. The thick line represents the velocity. Assum-ve lr:w;fa xnx:py*0 e 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 ek/l1jfax:u (cw c.7jstraight track is shown in tkcuwa17 .:jfx /(lcejhe 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 vt1ql hkp /c qa9i1:.uc .n.wnc k)w44wvobtz4s. time graph shown. For what time(s) isn )u1w4wbk ch w t/9lccpoti.v:qk.1n.zq44 a 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 cw.gid;jh8h r23m:8-d ty 0wrdu r r/nthe velocity vs. time graph shown. For which time(s) is the acceleratioud/mrji8d;gcw 08 hh2y3d:t nr-wrr.n 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 ac(w am,0uu c:vgceleration vs. time graph for a fixed time interval of an object’s motion, what quantity ,m(:gcuu 0vwa 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 increasi2 71d-ns*.nvbygtwz7 xiy+ fk ng 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 te4u9v1 8ackl3yjt;ac wo 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 t yyig u:( .gnu/esa2/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 grya:waqg/;1b k )o cx;o0rwnwd dx2 w9:ound 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 a horizontal uzkt-az-+nvtrra ihw0 jt dr :44f9c1 b 826oyaxis is shown. What is the total distance traveled by the parti41-ijthoydkb8fn40u: ta2ra w6rz-t9rv + c zcle 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 foll*z.)1n:vra 8h:.tws w xlqvxaowing choices correctly identifies all of the listed situations for which there is ar:nlx.wv xa.azsw 8:v)qh *t1 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 o su / kl-k)ut2i/fmg+along a line is shown. The object starts from rest at time t=0 s. At what time(s) does the object attain a maximum displacement from itsfimtgsuo u-/) k/ lk2+ 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 linqn9vfr/zn6pz);ojt, e vs. time is graphed. Wpn) n r/q9ot,z;jfv6zhich one 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 hor- xk3:/rhwd et3e,ivc( fyma)izontal track, each with constant acceleration. At an instant of time, the informa:y mxc/vkhe(tar3iw- fe , 3)dtion 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 aiv.zt rg4- d6t 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 ono e.s2et b6w xiux-o6mh f ,;ch9frm65e of the following choices correctly29it co-xefsh b;5mu6wfx6 .mroh e6, describes the relationship between 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 instoybqb4(/7 p yiuzx yn8 h -sid8)wy94rants of time, at which the car and truck tra wu ibh7yni-y/)9xb (opry 844 qyszd8vel 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 z6-rr sv n0vmwqb..vw6 77ohr origin and will move along the x-axis. The acceleration vs. time graph for each car is shorovzq7v m-s7h6.0w6br.wnr vwn. 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 a horicb b*nn7 ,wd;rzontal line is shown. At what time(s) is the object rnw,nbbd 7c; *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 thl xjh 6aa2,wqm.d/5sae x-axis following the position vs. time graph provided. During what tim2q,j.5lwx/a6 ahd amse interval(s) does the mass have zero acceleration?


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