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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)dc 4 w cgyq,ebd 86h3(ens*is/s kryhfi(6/k 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 unit time without reference to a part rt 5m9dq3:3pps azfn uja8/y8icular direczrna8um p:f9pyajd qt8 353/s tion 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 .exjx n(5:z dhaverage speed of 50 m/hz(xexnd5 :j. s and then completes 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 at the constant velocity. If it conti2b :w m m1fbsrug.u jf,6g9op8nues,p8gu.owfm bruj:bm69s f2,g1 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 staep 5g jw2-wl9*, vjkq/oe9zjltionary on a 30-kg plank that is sliding at 5.00 m/s to the right across a frictionless pond. The boy then turns and starts walking on the plank at a rate of 4.00 m/s to the left, relative to the planjpz9qwe*kj2gw ejv ,9o l/5l-k. 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 4 z21nxay*y jr-00 km at 80 km/h and 400 km at 100 km/h. What is the average speed ofyz r*xn1jay2- 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 m7 liy1v,t l jv6t6;9m 5kthe:cairx7eotion of a toy car traveling along the x-axis. The g 7kictt5a x v7he6lly9,rv etm;i:6j1raph 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 t( du um2z(j1cw 2 rk(yemnmg9: .h3tarefers to the motion of a toy car traveling along the x-axis. etnm3 y9 ruu(:dkca21(g2 (hzt w jmm.The graph 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 question refers to the hqf w4h9 sx-c-motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the xxs fq94c hh--w 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 velocit(puawgs6sv, w:a *)a fy vs. time of a duck flying due south for the winter. At what point did the duck stop u(svsf) ga:6a*ww ,ap 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 eq3zg/b afc1) :.cp 1gwwq5cpshows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was thqg /ae5 )w .w cp1g3fz:pb1cqce 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 positio 7lmkioahv/ z858n /ofn and elapsed time of a car starting from rest and uniformly ai fomnv 75ho/z88la /kccelerating 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 objec) i+vzh8 ;sqy:rqm-a nt with the positio+: 8mqni z;yaq-)rsvh n 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 rn 8 fdsv*x9xy4r1ly s2*6dvre efer to the following information. An ideal elastic rubber ball nxexyy* d4*d9l6s2srvvr8 1f is dropped from a height 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 question refer to the following informati x00dfl ao-+cgon. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and re xf c-+ad0o0glbounds 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 can7ia ypd42*y.dg a mcn3r bv7k: travel 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 to the followinrscj28*3djb.a o9 vzmg scenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
During which time interval would cars #2 and #3 be moving at the same average speed?


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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.02: The question refers to the following sw7 ;htbinm tad0+rnkme8;w t8 ,81ljmcenario: 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 scenario: A-o i2 cv2cfvg7.y:a wit $t_0$, 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 scey6k l phx:)j5rnario: 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 ramyel-exrbkmj4qn . 2iy 8*ft::p, across a horizontal table top and off the table edge. Which of the following would best represent a graph of the magnitude of the ball's accelerati:ye yf*jnq4 bmxeti-l28.:kron 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 nj +sbfsun,v eg: ,1n-for an objectb nu+s:jgn ,1s-evf, n that is moving along 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 andvlt p kxo17w 0j2tk6n1 time for an object that is moving along a stk w tlk611tvn0jox 7p2raight 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 strag*g7sm fxnj)w ed:b), ight downward on Earth with an initial speed of 12.0 m/s from a position 10.0 m above the ground. Ign,f *mj)gb )g7:w xendsoring 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 tofx- y;xbt ym7(0n,wa ft)voa, y car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown in ( 0 xaoaw-,yn7vt mbyx, )f;tfthe 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 betv0 i+wl d;rq3 d6xtrm./tt (klow represents a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown in th qt.lr w m60t3kxrdtiv d;t/(+e 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 ri 0popraib*;m7 g u)/accelerating across the floor. The time and distance traveled from the start are) 0p7*/pgir m ri;auob 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 poa 0cg3wz( jngg* 7,aggsition of the ball eachg0(gaang c7gw* gz j3, 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 uniformly accelerating ball. The position of tv8k wcm a,e2z9he ball each second is indicated. ,emzc9ak 28v w
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 li*bvd:v hjvv v o969 jt2e+dp4dne is shown in the graj:9t62e+ jpvvvb9 vv *do4 dhdph 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 straigtc qwl/ot8*:rm lgz-i+ 3lis*ht line is shown in the graph igr:+ l* o-l*8iczw/qs t3 tlmbelow.
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 02dj lq;z+capp tl2)ethe 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 k47 6btwwbiuhk lt/ 06graph describes the motion of a marble on a table top for 10 seconds. For wh7kb/4th6buwwk lt6 0 iich 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 3s kv8uwm jf b(qo54 n.zi8ay-motion of a marble on a table top for 10 seconds. For which ti(ns-.4f85uzywi8 k ovbj mqa 3me 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 mot* ,fuja1 yfc9lfbp 6wod,gn.y(i 1j4vion of a marble on a table top for 10 seconds. What is the marbles average accelerationfl91ag* 6ivj1onbd y ,,uj f.wyp4fc( 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 unifo p(2(qn, wixmfg3d(ro .qo. ukrmly 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 dowo-k in8k4,j us hd1q2pnward 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 reprl+1 f,:xdjs-ww+ghgi esent the motion of an object moving with a constant spf x -,lwgsw1+:hd jg+ieed 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 the motion of a toy ca9 sz:tce7fa+b fnbs27r across the floor for 10 seconds. What is the acceleration of the toy car at t = 4 s?satb n f7z2fs9c7e:+b


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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 across 6l+u fc*z2zxe9adc0c the floor for 10 seconds. What was the total displacement ofxd c+zza9u* 0efc62lc 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 graj( stih 3xtc;j,closl-a0 e wx 79d3a6ph describes the motion of a toy car across the floor for 10 seconds. At what times or time intervals must the net forcs ll, 3i a0cjt76so3wcx -td(xjaeh;9 e 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 accelerh;v1cwl+nyicqnnl3 o.4zn 04ates uniformly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best represents the accele0 ync nznnhw41lvl.43 o+c;iq ration 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. Whicr7 qes+ ,/mij)pzrv e:h of the following statiezrr/p),7j+ v :eqmsements 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 ve- cq) fj*t 3ve;osbym4locity versus time curve shown to the right. When does the car have zero accelerati; m) -tq34*ebvcfoj yson?


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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 ther00 k hrzwtn+1 angle between the velocity and the acceleration z r100rktwhn+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 apas-t cm gbrtu c9r jzh)ah:yd3m544)i .ucov38rt and traveling toward each other.i)ht . u85:r v)4do9b suztgma3yc- 3rhc4cmj
is moving at 60 km/h and the other is moving at 40 km/h. In how many hours will they meet?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.04: A particle moves on the x-axis. When the acceleratd5 o px3*1/sn1i mley r6/qfmoion is positive and inc5mso6myfq// p*di x31e1l on rreasing

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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 ary* crdkl;6t ),fo bf0verage velocity is

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.18: For any motion in two dimensions, which one of the following c( iv7z+hhpb 1lhoices identifies quantities that must have the same dirzbhilv p( h+17ection?

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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 movesna)e, feklu9lns9 /+y $3.0\;m$ 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-vuxp:p n-9gulm:tvw*rl a7j( /4vb2etime, $y\;vs\;t$, 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 wg6+fmisa 81u in two pa m +wfg6a8iu1srts.
• 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 zx re7i,;:8vft baa*vthe motion of a car on a straight track is shown in the diagram. The thick line represents the vel ,iberz :vx*a 7v8f;taocity. 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 g3 e0rtman b+; sa0j3iimkz53;bnx xj2raph for the motion of a car on a straight track is shown in the diagram. The thick line represek;xnjx ib2z3rebsm+;tai 53 n jma3 00nts 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 obj u-4) (,zgjbuqpq k7ha3djd1at-oc * tect given by the position vs. time graph shown. For what time(s) is the speed of the object greath(j3a4*-qdktto- ,jaz d1p)cgquub7 est?


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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 the velocity vs. time t s;hak1bf -8o;hy)i tgraph shown. For tt-kh;sobi )ah;1f 8ywhich time(s) is the acceleration of the object equal to 0?


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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.24: By computing the area under the accelerati8h ng g8z6s -ts x05jxzzj;ih*on vs. time graph for a fixed time interval of zx8 zn-xgs* i jh06hz;jg8t5san object’s motion, 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 increasingdqo70ppedk)-v 6a3 ei( 1zpjbb)h9 tk 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 partsz,- *+plb4 qm faz05x0 rrpwsa:
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 g eclz 31,ch4: movd())*a6mrdei ek vzround 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 nh.e)z3r,abt( .m job 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 6,,y0d xwwry zmoving along a horizontal axis is shown. What is the total distance traveled by the particle from t=0 r6ywd0zy,x,w 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 id,msbd 9u* +wjpentifies all of the listed situations for whic* bw+d9pj,msuh 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 forrch:+0 7bhle((bv foky( mjm +tjnhmp89,0 oc an object moving 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 its starting position7 l+yo0+mcmrp9f(h8ethbj(nbk o:(m0 v,hcj?


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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 atu+c l-vytvk67os -p- q+ :fadm the origin and its velocity along a line vs. time is graphed. Whm--ykl +v7avu6:fsdpoq- tc +ich 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 :l- 5tsuyi5lil tf/szkh4d -3track, each with constant acceleration. At an instanti3il: /ss k5u5z -4-tlhdtfyl 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 a position 8;vfnvjl 2x nq)0h lbtf70f g-$x$, 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 sxun2vxs is8f.paj1je*ym 2yf w:,h ( 3;d8ckt hown in the graph, which one of the following choices correctly describes the relationship bet 2ji (m 8hn2xuvfaesj*3yw dytx8.1sc;kpf:, ween 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 insta ,b a2xk.vha5 w7fx7u;cov t*pnts of time, at which the car and truck travel with the shaab7xox;w c.u2 5 p7k f,vv*tame 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 thw pk )6 jpkalj9wp-rc*9wlv8h7a31qqe origin and will move along the x-axis. The acceleration vs. time graph for7*pp q rk3vj )lwh61a8w qac9-kjp wl9 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.ua)mrw3l)yb/ 7.bgmg time graph of an object moving on a horizontal line is shown. At what time(s) is the object moving with its greatest speela /g3yb.gbw7 m) u)mrd?


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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-axwhuyl72- vc:vwuaq5 i j3b+6wis following the position vs. time graph proviu-hlb quw y62v:+5 i3cw ajw7vded. During what time interval(s) does the mass have zero acceleration?


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