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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 constang s-,j6met ;stt 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 dista3qq.fr naz1 b-nce per unit time without reference to a particular direction ifz b31 qarq.n-s 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 tr fh3bb mjtqp.x(ie/6 ml8o0t4 ack at an average speed of 50 m/s and b6bt0qx43/fjpmit .m( ho8l e 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 mov-mwwx of,a61 :rbjol x- z70e;hih)dqes 0.80 m in 1.0 s at the constant velocity. If it continues, how far will it travel 7hxxbmjfzwqo:di ,6 aw)-oh; e -1r l0in 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 slixy6mtyp- )lrj :*io5gding 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 of65r mxpiy)ltjog-:* y 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 br5 i-e l tes)aaz9aik 68u)a0400 km at 80 km/h and 400 km at 100 km/h. What is the averag0ze ail68)te)aa-kb rs9iu5a e speed 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 travhfzm7 67iv. yheling along the x-axis. The graph6.mf 7zh7yv ih 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 247at yl- lxw1plwtw.refers 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 dir -a lylw4 7x.12wlptwtection, $v_x$ 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 t9jn 3yc iz /-,rqtgvx(raveling along the x-axis. The graph shown below is a plotq9x,yz3 jiv/g- t(rcn 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 f. lmto ,5*dy9rgapwl4 .bdq/ flying due south for the winter. At wh5 q*f bd4dl/op.m9talw. r,gy at point did the duck stop its forward motion?





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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.17: This question refer to the diagram below which shov s6y6n:s5dmq ws the position and elapsed time of a car starting from rest and uniformly accelerating 66sdy5:sm nqvin 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 belot wg ;zeo+c l8uq8*y0tw which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The a ;te+lw0 ytg o*88zuqcverage 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 rmny0xk p1c 6ut:;pf;object with the position ;t6xurn1k p: p mcyf;0time 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 the followx8y(h)3 im/; iwjyxaying information. An ideal elastic rubber ball is dropped from a height of ab;hmyxi)jx a( /iw3y8y out 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 info 2vvf3m98c h,8mus hajrmation. An ideal elastic rubber ball is dropped from s8cvmv98h, haf mu 32ja height of about 2 meters, hits the floor and rebounds to its original height.
Which of the following would best represent acceleration versus time for the bouncing ball?


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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.39: If a boat can travenn+..ht . bwopn.ut j)l 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 following scen9shoy: * 7viflario: 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 thflhs )i59(mk(f r ibl5e 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 followxx wk8l; f4g cik.0nz .y7uw1hing 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 fru f4f,qo1cmz9o/ 3g0v *zuaaollowing 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, acrn/2nz7bc5 c q0g:fi lgoss a horizontal table top and off the table edge. Which of the following would best l/ b7fn5:zci 0qcgg2nrepresent 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 nprz/84, ky0fhe4igj and time for an object that is moving along a straight line. What is the instantaneous speed of the object ,hr0ejypik4f8nzg /4 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 disd*ml*4t*kl p4jv xtfh5zakk-p*44yf tance and time for an object that is moving alonxk-4ap y *tmvfzhl4*kpd*j4fl5tk* 4 g 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( 6dgz.ifo 5 /jdecl3j-av6uh:t po; e with an initial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resistance, the speed of the object when it reaches the ground iv:c dlefg3op/e6 z-ja6. thu5j(o ;ids

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.11: The diagram below represents a toy car starting from rest and un oduc5 ciny,42o*dkw yln5nskix+y/bg 9(/: xiformly accelerating across the floor. The time and distance traveled from the xs: +5/n/ ndbok ,4( g yxnyi*9iucd5ywolk 2cstart 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 startip5c e;+cx3 s6xq:skj zng from rest and uniformly accelerating across the floor. The time and distsp +;sxxk:cq 6c5j3 ezance traveled from the start are shown in the diagram.
What was the acceleration of the cart during the first 0.4 seconds?


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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.13: The diagram below represents a toy car starting from rest and uniformyzmcg0hbtw 91b k;n)3ly accelerating across the floor. The time and distance travelegt 9zm3c0k w );h1nybbd from the start are shown in the diagram.
What was the instantaneous velocity of the cart at 96 centimeters from the start?


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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.08: The diagram shows a uniformly accelerating ball. The position ,smq1 s)rpqp5 of the ball each second is indicated,qqpprm)ss5 1.
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 sh2n8 ne zlz23hmows a uniformly accelerating ball. The position of the ball each second i2 elh2n8n3mzzs indicated.
Which of the following is closest to the acceleration of the ball?


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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.17: The motion of a circus clown on a unicycle moving in a straight line is sy l)- dix7nm4jejdn,8w2vmg /j9c c9phown in the grap2ywep9vcn jmd8cg7l 4i dx/ j9)j,m-n h 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 strai v:rvi21li /zhght line is shown in thev/zr 2hi l1v:i graph 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 freely in a vacuum near th0osz;m0 :uk v oib)d/ne 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 l0crpt8 a8-b;0jg qtgtable top for 10 seconds. For which time intervaqtl-p r8g0 8jab0c ;tgl(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 motio6h9oa 5ntgx 2s9dl5 njn of a marble on a table top for 10 second2t6n5o d5nh9xsa gl9 js. For which 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 maht,-m/,jzep crble on a table top for 10 seconds. What is the marbles ave p-czht/,jem, rage 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 u-jw(i:ryt r7m0k.br rniformly 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 with a speed llz ) o3 ba+wdx)cjd2*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 coulzx,*(angm0c n: xifh *fr5hy /d correctly represent the motion of an obj0g,ih5* xan(n/ :yzfh rxc*mfect 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 the motion of a-feb.k4*u): gxd f ofkt6h,ug toy car across the floor for 10 seconds. What is the acceleration of teb* f gf)4xohg,t d-k6u.k :fuhe 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 mc1k k,c15d r1u:bmzf9rkp 3ti otion of a toy car across the floor for 10 seconds. What was the total displacement of the toy car for the entire 10 secondkd,9k1i13 tc1 b p:mfzrkur5c 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 car9x y)rmv 1gsm/qqyib// ;8am a across the floor for 10 seconds. At what timevs)r /aqq9i1xyga/mb;mm8/ ys or time intervals must the 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 uniformly from 0)c l67ppw3euc48q qk 0iziqz9 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best4qucz 6 cq)ei 89wip07z qlk3p 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 cuxq8bhpa9r4 6n)x m hx2rve shown. Which of the following statementsp 9x m8) 4a6nq2hrxxhb 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-a5jh g*zyz3 n,lxis according to the velocity versus time curve shown to the right. When does the cgnhz3 z 5,j*lyar 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 tb,+l 2o-*xfu/u4t t1cx kao lsennis ball is moved so that the angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true about the tennis ball during this interva1 lxfuolx/so a2tt +-ukc*,4 bl 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 toward each obp8q+jg;vsev- o aa5xu md0.o) 6dkm-ther.a +v eo-u-6vxk8d)smdmj ob qp;5a.0g
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 6elfj :29p atzl/mx/dgbvl 5 7the acceleration is positive and incr: 7p25gzlmte jv//9f dllxb 6aeasing

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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 aivy) uj/q7(lx r,p*yaverage 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 diqs7ir1ms3 eety4hw (w;ux8 2lmensions, which one of the following choices identifies quantities that must ha4 wylse32uwe7;i8qrxt1m sh(ve 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 moves31 e iiap;mtrrv1s)k fq; r9c; $3.0\;m$ 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-timeqh7.t+vt w4 le2dpn+c4 qg f;s, $y\;vs\;t$, 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-dil s389afyr5s(q 2pwjg;7e d7 ntb,nt r3ddo n.mensional track for total time T in 73d frs73 dagn sd,(lp. 9 wetotqb8;25jnynrtwo 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 a car on a dm,c/ tdu1 0qdstraight track is shown in the diagram. The thick line represents the velocity.10dd/q d,cmtu 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.om9d/qe q)8;e hp5ccp time graph for the motion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume thatq;de5cpq)pec 8/h9mo 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 motio-j0fs-uk kf6z n of an object given by the position vs. time graph shown. For what time(s) is the speed of the object gresuk0f fzjk--6atest?


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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 e f x-93h3a7esvsgt(aobject given by the velocity vs. time graph shown. For which time(s) is the acceleration of thef-7 asa9xv3 shgtee (3 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 k)0 :pbwr am0kunder the acceleration vs. time graph for a fixed time interval of an object’s motion, what quantity has been deterb) wp: a0k0krmmined 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 wi+s)ed d ,fi.jwoyzs3g d2 js*9th 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 triprz s 7 j.0cc-kepn*u2k in 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 3eq si4 nd:xi gqp(v:+9j p,hwground 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 restctsn ,,rq 7me:umc4+zgslk7 /6c n i-e 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 par9on/; p1 vqliouja t3- rj9y3gticle moving along a horizontal axis is shown. What is the total distance traveled by the parv-9iotlgp oja q 3/jn;r 93uy1ticle 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 choi alif y+5k5t45s1d c )hpg-wnuces correctly identifies all of the listed sitdu-s5f1+pct kh5aw n 5 i)l4gyuations for which 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/opt9 bpl2oo3iiurm4b9 4a m+ for 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 maximumupobt9o4 m2 49al+/iomr3pbi 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 i9rdby/i /-i xalong a line vs. time is graphed. Which one of the following choices best gives the proper ir xii/-iyd/9bnterval(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 dm2kjs2 h-:dz track, each with constant acceleration. At an instant of time, the information about dj2m k:h2dsz-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 posiz(z( +7w; a mvh ww9br.hext2etion $x$, 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 y-.j)b 5 dj zdlrub5 ,3oc5hiv)grsd/raph, which one of the following choices correctly describes the relationship between the average spo)jir/5dsl du cdz5jybhg5 r , .3)v-beed 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 desc*:bv nwu-(uqk jhg *s6ribes the instants of time, at whi:us( -u nhbgv q6j**wkch the car and 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 Q, each start from rest atwpip6tm.9z9 ;qj2a jzzz8 . dxvi3 c-p the origin and will move along the x-awipj8 i.2vxp6a dmz 9c3;p9z-zqj.ztxis. The acceleration vs. time 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 anqg(9 esk9 mrf) object moving on a horizontal line is shown. At what time(s) is the object movi)esmq 99f r(gkng 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 cc pdlm z6. s1blz- la65q76 lnim8-u8kyia7uthe x-axis following the position vs. time graph provided. During what61qul 8lm5p7d l .87yaz 6- kcbii uml-anczs6 time interval(s) does the mass have zero acceleration?


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