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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 sn z x)t2:/xajconstant speed 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 uni-* 3(7+qqenqi+ jnu i)wmoav lt time without reference to a particular directio3 q vmnq)wu+a(qinjlo+e *-7in 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 aro 3f7ump q. fh7py,d;9qi23eti7sf c.ybe 8 baaund a circular track at an average speed of 50 m/s and then cop9.f.378bu fd metpy2qafc7ib h7s3qaei;y, mpletes a second lap at an average speed of $V$. The average speed of the vehicle for the completion of both laps was 80 m/s. What was the average speed $V$ of the second lap?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  95.03: A toy car moves 0.80 m in 1.0 s mpm )vp pq0,+hat the constant velocity. If it continuespq+hvm p,mp) 0, 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* nn)q+mh1sc q 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*q1 +)nhscqmn. What is the speed of the plank relative to the pond now?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.18: A motorist travels 400 km at 80 km/h and 400 km at 100 km7iy* apkj0-oh /h. What is the average speed of the motojp7hi0k y*-o arist 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 re9:jky;*2 yazzhmgv n, fers to the motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the x g ah*y9nzjzv,m;: y2k 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; yyj-f0wu ( t38qifwhc;pu2z motion of a toy car traveling along the x-axis. The graph shown belowufty8;f-uy (ic;z3jqp w wh02 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 question refers to the motion of a toy car traveling along the x-ax;(9lrial 1 rexis. T1r li;x 9l(raehe 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 velocity vs. time of a duck flying due s dm7bqa2me1, h,ehm s7outh for the winter. At what point did the duck stop its forward motion? 7 , aed ,sbme7qhhmm21





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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 z: dqc6 v).vjj/g rnc1below which shows the position and elapsed time of a car starting from rest and uniform cz:g1qd6 .jjrcnvv/)ly 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 diaz h nc2ppvn09)gram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight lch pn0v z92np)ine. 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 foc(ro2.f+i t :5ui jqqzcw*v*d r an object with the posit.v(+i**t2c5uzc wdr j: i qqofion 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 questiosg+*ge+ h 1t8k(rni, uh)j rgbn refer to the following information. An ideal elastic rubber ball is dropped from a 8b(*)t1 gg nj ghkh+rie+u,rsheight of 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 quest )7nf9 z7/k pwcijyux.ion refer to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its o.xn)uifcpwj9k/ 77zy riginal 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 travm osykb/ c).+ nlby q1,;h5wvqel with 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 sz811 q-lk/mhe mft7eto the following scenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
During which time interval would cars #2 and #3 be moving at the same average speed?


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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.02: The question refers mc-ft 8wa 7x4o*+jpc fwcs1r5to 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 following scrvuj / 6p/rh66xrdh 0 pg51jyzenario: 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 ;i au(h +( ;+odovostithe 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 d s;a7q prt3dx 5aki4*(govu(fown a ramp, across a horizontal table top and off the table edge. Which of the following would best represenr374ksiv(q5tpx (a; od aufg *t 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 betweensy/lm ii,fb0y o2za*7 distance and time for an object that is moving along a straight line. What is the instantaneous speed of the oi/z0bsil, * ofym7 a2ybject 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 th1 1 wr.znp. 6asc,yutw n8axt+e relationship between distance and time for an object that is movin.usw awy8+x, r.ct1n1n6zpa tg along a straight line. Between what times did the object have a non-zero acceleration?


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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.07: A small object is thrown straight downward on Earth with an8 9lf es2 vmia*rat/cm;4v8 k6dg y.uo initial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resistance, the speed of the object ficl8mome *4 t.uk v6 8ry92/ga;svd awhen 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 belypcwn.wjid*vr2 r 3/,hsx ; . qyr.)svow represents a toy car starting from rest and uniformly accelerating across the floor. The time and dp2y cr*hsv d,sj/.rq .y)nrx.3vw ;i wistance traveled from the start are shown in the diagram.
What was the average speed of the cart between 0.1 seconds and 0.3 seconds?


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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.12: The diagram below represents a toy car starting fro ppl;)zjvdmsf)7s 6z6 m rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown in thm 6z7lpjs6p;)dz s) fve 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 startinrv- )5u *mrgb1jbqfr* g from rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown in the d1rmrb*5 ub*g) rqvf- jiagram.
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 0z 0aaav :i jc/sev4z9the ball e0: ev z4izva/aja09csach second 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 uniformp 5yget ez:q;i7 ezk ,5:sn:ux5xrsf5/ w+phkly accelerating ball. The position of the ball each second is ind55ty/zs;k:, s reefnkup :wg57z5q :xe +x hipicated.
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 unicpt1wib acofa)qz 8 +z 5j):i0mycle moving in a straight line is shown in the graph beof8iz p)ba z j5q)0+amwtc:i1low.
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 ;d u7up2wf4 *9 lvgtddin a straight line is shown in the graph belouwg9*pf2 uv7tl4 d ;ddw.
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 su (*:fe y8a wp;wzsnrh2rface 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 obae p4j.46ds0i;spm o n a table top for 10 seconds. For which time interval(s) did the marble have a nepe.4ss4ja m0pd6ob i; gative 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 tablq3gpn 3 (s:/+1gz ys+bmq; q f+nbdneue top for 10 seconds. For which timm1 qu/ ngqgd: b(bsq 3z +y+3pse;+nnfe 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 marble on a9o7.t88)set0j qan pbe ul 6 6quvy4it table top for 10 seconds. What is the marbles average acceler6eta 486qobsu8e9yt 0 .pt ijvn)q7ulation 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 unif v*l0eersq67 d- w-wlod z2a+dih8c3pormly from rest for a time of $2.00\;s$ through a distance of $4.00\;m$. What was the acceleration of the car?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.06: An object, thrown straight downward wryrk2zzjotpmn5 rf7v2 zs531j7(, ssith 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 of 9hdy;kvi06nun * mj6w ikkck9y 2, 42,gdeltpan objeckiwcyj2gun949kded ilpm k,y0;6,t nkhv 6 2* t moving with a constant speed in a straight line?


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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.24:The accompanying graph describes thewj)a qa t;.gdxce/isf)w2 vct/x+- +q motion of a toy car across the floor for 10 seconds.-2)w/ge/xtqwx s ccqaj)v +.dfta;i + 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 kcw 3x- 4rqne1car across the floor for 10 seconds. What was the total displacement of the toy 4nkc13rxw qe-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 the floo59ahmvlt0 0ufor0t hym 33ws icg 4,y8r for 10 seconds. At what times or time intervals must the net force on the toy car be s 0c5rtm3m y3t80, h9hlgaiwu oy40vfzero?


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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.03: A car accelerates uniformly from 0 km/hr to 60 ilp6vx.z:w/1g7utinml5z6m km/hr in 4.50 s. Which one of the following choices best represents tz56l z/u w76pinm1v:l.gim xthe 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 shownjz7l88 i -o*yw6xvkws. Which of the following statemen8l yoswk6i7 zwj-8*v xts 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 versu*hbo*-k gwp1-1kvnf ts time curve shown to the rigw -*11ghvn *k-fto kbpht. 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 lwbjb6xj8+fw/bi p0) ball is moved so that the angle between the velocitf08b+jb ilw6xw /pj) by and the acceleration of 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 and traveling towa c:/rnd2lmes)j(zylm8ahn (1rd each other.8ny (h)cszlm a1l:ej2d(r/mn
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. Wh 3 ;u,p 9yyoi 9h/mdd- tbju89rttne9a)hi8zsen the acceleration is positive and incretir bu3 9 9;/z8i9pydoje-hy 9s,)h8ma tuntdasing

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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 9o z4qfewu(sj +hq2:y 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 dimension (z yroau:25/:4np.pu evts wes, which one of the following choices identifies quantities that must have the same direvu(ztoe: nws2:.ae4 y5pu /p rction?

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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 5;pd1fdio8 (klmlh3 c $3.0\;m$ 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-tim)t.4opq)u 5bjdbh9xx e, $y\;vs\;t$, 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 total time T/ 1, dnog/if :kyzr:im9 -zqgf1d oe)t in tf:dgn,/ im getozoq zd1/:kyi-)1rf9wo parts.
• Part One: The car maintains constant non-zero speed V for the first $\frac{3}{4}$ of the total time.
• Part Two: The car accelerates uniformly to rest during the last $\frac{1}{4}$ of the total time.
What is the ratio of the distance traveled during Part One of the trip to the distance traveled during Part Two of the trip?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.23: The velocity vs. time graph for the motion of )waqp:f-gl t7q4 s 8nub 1;avva car on a straight track is shown in the digl)n uastv84w q7-:1q pa; bfvagram. The thick line represents the velocity. Assume that the car starts at origin $x=0$. At which time is the car the greatest distance from the origin?


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.24: The velocity vs. time graph5x bf7u4auqa- 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 7fa54ax uq-b ustarts 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 mou0pd3 e; dvq4uz*hnx) tion of an object given by the position vs. time graph shown. For what time(s) is the speed of the object )h0; dnuqudz4*3e pxv 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 tdcdz:8x325zit6qf6/itukq fhe velocity vs. time graph shown. For which time(s) is the acceleration of the object equal ttf3 ckt 2dq86/zxdu iqfi:65zo 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 accelerata 1w *kbze1w,hion vs. time graph for a fixed time interval of an object’s motion, wha1eba* ww1 kzh,t 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 hor:7s 8t a);pugmkt fze1izontal line with increasing speed.
choices could represent the signs of the velocity and of the acceleration for the object to achieve this motion?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.14: A car makes a trip in two partslf,:j7c6p oofr pg8 1y:
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 x6owm tn c3*jb*mk2z-from rest and reaches the ground in a time of $2.50\;s$. Neglect air resistance. With what speed does the object reach the ground?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.03:A small object is released from rest and reacs kio9qfs8c .gu9x m 63auy:b+bo wu4,hes 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. tpx mkp1)2 w6 .g.ix jdk5,opbfime graph of a particle moving along a horizontal axis is shown. What is the total distance travelg5, p. .fdm p 6xxkokwjpi)21bed 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 c jvk .k;k.p1dp(m, crchoices correctly identifies all of the listed situations for whi,kkp(.1c.dp j cm vk;rch there is a non-zero acceleration?
Situation I : A point object moves in a straight line with increasing speed.
Situation II : A point object moves in a circular path with constant speed.
Situation III: A point objects moves in a circular path with decreasing speed.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.32: An acceleration vs. time graph for an object moving along a line03 8lfa;k (lqtpz 6qdw is shown. The object starts from rest at time t=0 s. At what time(s) does the object attain a mtz0(83la6dwq kpq; l faximum 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 v4( f3ziwrkap 0elocity along a line vs. time is grapha krf( 0izw4p3ed. Which 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 horizontal track,i./3+y lbpwka lz3z:i each with constant acceleration. At an instant of time, the informatiok33.lzw :iz/apily b+n 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 4x kc9k3 6elgfww8 al9a 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 g tnk6 a)jvpk2rx+*m*e raph, which one of the following choices correctly describes the reln+ pj6e)t*v 2mrakxk* ationship 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 irsp -1/13kcq)w1jspt yzh6i cj8d 3ndnstants of time, at which the car and t63sy hkpjsdz/r1 wdj1)n 3p8c -ctqi1ruck 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 Q, each start from rest at the originq4jn 3mwvp+4xveve87 and will move along the x-axis. The acceleration vs. timev3 4q87nvew4jmxp +ve graph for each car is shown. Which one of the following choices correctly identifies the relationship for both the speeds $v$ and the positions $x$ of the cars at time T?


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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.02: The position vs. time graph of an object moving on a horizw8pyn: c6lo3yv3r0 mpontal line is shown. At what time(s) is the object moving with its greates3 p0cylvrw y38m:n6po t 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 p+6t;rc jw30 nlpw/tjr osition vs. time graph provided. During w6j0; r/ptrct+ l3w njwhat time interval(s) does the mass have zero acceleration?


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