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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 a circ6lc2ne3/:iq wn mw2vivw .5zgular 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 t h j7/;oqom*. oq01hyzohfd k4o a particular direc/ 1kf jooh hd0z;q7mh4oq*oy.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 onex5ios)95 5c ;;prospa pe6 ytm lap around a circular track at an average speed of 50 m/s and then completese so5;s 659 x;)p pmtycrapoi5 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 veloci-6 u6bb xhriy-2) d:op-tkq glty. If it continuesq ur2 -oh p)b bt6-6yd:ilkxg-, 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 statmaq:0trr ,uh nnleme)/h (.*cionary 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, . tnm/ (aue 0m *clrhen)q,h:rrelative to the plank. What is the speed of the plank relative to the pond now?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.18: A motorist travels 400 km at+irbk93 .tdjg 80 km/h and 400 km at 100 km/h. What is the average speed of the motoriskjr db9 i.t3+gt 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 refewa .7c 51q;ljzn dm5qkrs to the motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity cw;nl.d 57majq1 qz k5in 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 traveling along th*j2xp4b altu)v7 ( zs 3e3eaghe x-axis. T3za 2pt)evb xalgj7 (4 eu3h*she 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 motion of a toy car traveling a/fu:gs8 8 lbw3p u/ezilong the x-axis. The graph shown below is a pg:wsu p 38uf/z/ebli 8lot 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 gras*ki3b22drnt tn iy3;ph of the velocity vs. time of a duck flying due south for the winter. At what point did the duck stop its fo bit2t y;nsr2dki*3 n3rward 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 wdm bmys,6e3h6mn2h wzrmt 6;iiu.zr2rs 92.vhich shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the averagdbmwh2hu3rzr66mtr. vm.6i ; m2,i 2ysznes9e 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 diaytml--dwh8/; o4 x v6jq6 yoscgram below which shows the position and elapsed time of a car starting from rest and uniformly acceleratih -/q t68dsly mjc;oo6yx-wv4ng 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 vel+ce+puc a6tnh-z a)w(20yalfocity time graph for an object with the position t+tefuyahcnz aa 20w l+-6p() cime 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 few-q-ye-bh8f4p6 nz tu1t 9rfollowing information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its originalh1z8b-en- t -teuqwy4f9frp 6 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 information. An i1/: nz--xzar) exipiqpo f /n,deal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and reboun)x:x q nieaz-n, 1fo/p-rpi/ zds 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 trave suriuzp*5y.;ie*+ ah 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 scenarioizkn. o*hca79 h8juvf;/ :lrb: 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 ebka5yptc 78vquuls/71l l t*kf2:x+ kq -4imfollowing 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 tb7c;edz8s1 o ao 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.
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 scenariobl. c: iwcau775 5f9hxfj ev4x: 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 ;)n/q5-m a(kmgujd rs down a ramp, across a horizontal table top and off the table edge. Which of the following would bmasru/( kdm5)-jq ;ng est represent a graph of the magnitude of the ball's acceleration vs time?


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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.01: The graph represents ggzjx +2*ha1t the relationship between distance and time for an object that is moving along a straight line. What is the instantaneous speed of the obt1*2ax +jg hgzject 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 represeasht5 z++on,wu+gpcl./ /hvwnts the relationship between distance and time for an object that is moving along a straight line. Between what,v/++u5hw pz .s +o/c hnwltag 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 thr9 rnl0+5-pord bxihp(z)m0llosya* *own straight downward on Earth with an initial speed of p l mb9* inp0h+)xrz *lar(oo5y0 ls-d12.0 m/s from a position 10.0 m above the ground. Ignoring air resistance, the speed of the object when it reaches the ground 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 toy car starting from rest and unifors z*foy* +l)upmly accelerating across the floor. The time and distanul *opy+ s)zf*ce 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 belowwnmvcis y +23a4glbjt: e/b9. represents a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown i bi:/n.bjglt39y 2v cam4s we+n 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 stahy9n7qmwt2+ ; gs5 yjorting from rest and uniformly accelerating across thwqy+;2o7hgmnsyj 95t e floor. The time and distance traveled 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 acc) dvnta6 vm1t9elerating ball. The position of the ball each second is indicated. 6dnm91)tvt a v
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 accqbxn 6 h);8bf5i-e4hz. r0yyao idq: delerating ball. The position of the ball each second is indicated.nofxi)6 ah d; hi -4ybey:z8q r5db.q0
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 ihi -p5by0r5c m.wn.x qs shoqwyp-cnr.i5 b0x5. h mwn in the graph below.
What would be the acceleration of the clown at 5 s?


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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.18: The motion of a cd-j. l 2mur(scircus clown on a unicycle moving in a straight line is shown in the graph r-c us2d( m.ljbelow.
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 nr;qkrlkjs+ :; ear 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 marbl7)t bfo9h3dtne on a table top for 1 9f3n7th)tdo b0 seconds. For 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 of a marble on y8+4k03 jz4yhdcblvepi4h5d+ 0hopsa table top for 10 seconds3 piyvhy0 +0ozhldph4kb48 5+cj e4sd. 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 mar;b+da8y43k. p qdb8uj (llsnrs k;h- ible on a table top for 10 seconds. What is the marbles average acceleratio(+d8bryssu -bnl 4a83il .hkpd;qj k;n between t = 3.3 s and t = 3.8 s


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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.20: A car accelerates uniformly from rest for a u4b l3a(hi (xjtime 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, throwq 6kqn0 kflz:1n straight 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 3c(qfjh1s3d f/; q kgzcould correctly represent the motion of an object moving with a constant speed ;3kz/ d1h3 jgcqffqs(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- dn5thn7o lt*dz)z, z graph describes the motion of a toy car across the floor for 10 seconds. What is the acceleration of the to z5,*t7 lnd- htnd)zozy 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 accompanyin6tysz) ,fa1 ( 1tqp.unsdu-x luz37 ht )gt+zng graph describes the motion of a toy car across the floor for 10 seconds. What was the total displacement of the toy car3z1sg t.7a)nz1 )( yxl+f ,shuttp-z qutd6nu 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 acrossh a:2oqk1ty;/cl,ydh w:o 9kb the floor for 10 seconds.kokw:qh:, 9yc1bol/2; dhyat At what times 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 km/hvq*.cqor m8(eb4 yu c7xqpn: 7r to 60 km/hr in 4.50 s. Which one of the following choices best represents thuomqpq8: 7y7vecq.n (4cb xr* e 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 followingcrp;p/g gth4p*t7n bf2) oi *x statements regarding its mg*hoctpg 74fib) pxt2 *;rpn/ otion 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-ax g++ .8el8zf(1m lwr uwlv1srhis according to the velocity versus time curve shown to the right. Whenw11ws8+ zr+f uv(llmrh .lg8e 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 the angle1g7 h* hqrj/xx between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true about the tennis ball d h7 xrhq1/x*gjuring 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 wm;v27 sa 4,7vfdnvpg apart and traveling toward each other.vgm wn4d;sv7p f27 a,v
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 acceleration is posiv6j) (cc hqfd33+ (ri;yhrcnttive and increasin r( j qt)rchfc+i;d hvcn63y3(g

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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 p(ou dt3o)pm zn2io53*k3z0zi xmzk* average velocity is

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.18: For any motion in two dimensions, whicltmt l+ x)/25u mazid9h one of the following choices identifies ql zi)+5lu dt2m/t am9xuantities 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 moves+: jm ul+aem* cckqkp) n,69lx $3.0\;m$ 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-timee1h4 rn;+dxu7wdigj 1, $y\;vs\;t$, 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 ti .l+2 ,lx7cepd+f 6-( g2wtpcbdnmm heme T in two parts d+ld27-enw+ g h(c .xm6melb2cft ,pp.
• 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 motioo-c) luxrkk5 r*(tox1 n of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume tharo l tkoxc5) kx(*r1-ut 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. tifoip z5ld- xw9(m43 / (so cixrk2n4ppm.ykw ;me graph for the motion of a car on a straight track is shown in th3l nkpk( 44 s o;m z-xi/2prd. xomw9yfpc5iw(e 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 ,; wr75kn*yo*gnad lr an object given by the position vs. time graph shown. For what time(s) is the speed of the object greatest? 7aynw,n5 olrkg*r ;d*


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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. timl 9 qt5 m.)waehucf83ee graph shown. For which time(s) is the acceleration of tafe 8w umtlec3)hq9 5.he 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 a1dxici p,dc2 )ivhxj- l.pu5: e+ez/ wrea under the acceleration vs. time graph for a fixed ti c) we1i/ zh,.icpxp-ed5:ux+vild 2jme interval of an 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 jfwv6f1zp.wb p ) bp; f/2-xfkalong a horizontal 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 parow5 q7dpxr,2:wvm1 lzts:
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 r 6 sjkowg;n o4+g-ahd:est 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 b7e d/). qolekfrom 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 p5qh4 e:kzlhfghcx)a 5 7u79b varticle moving along a horizontal axis is shown. What is the total distance tz)a:755hvc lgb k h4hqxe79 furaveled 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 choices correctly identifies all of the listedk7y:ue4;jx ve;nghm;c0o*k,zl ..jy m qay x) situ mn;euyy.y*cx ). ,j0;kv4ax:;jekqm hg7l zoations 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 vsz nhlh+(8x / l/xzhn;h. time graph for an object moving along a line is shown. The object starts from rest z hh x;n(l/ nh+xhz/8lat time t=0 s. At what time(s) does the object attain a maximum displacement from its starting position?


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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.17: An object starts at the origin and its velocity along a line vs. ti crg+jug/82c pi6bt2pme is graphed. Which86cg+p /i t2p2cjg rub 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 rbj+8ac:dy3b a ight on a horizontal track, each with constant acceleration. At an instant of time, the information about the ay8 a:bc +jbd3cars 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 6w qt0afi xx 4e;n--yz$x$, 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 one of th pxxi/:(c fqt/e following choices corr/xxf: tcpqi/ (ectly 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 describe):pt:c2g)7 olhx jdq ns the instants of time, at which the car and truck travel with the g ):t)nd7oh2:cj pqlxsame 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 origin and will j7pv62f8hsx n kim.8rmove along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the following choices correctly identifies the relationship i867 8n j.psvxf mk2rhfor 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. a4 fac 0-dig*bx55bw kwmn/w*time graph of an object moving on a horizontal line is shown. At what time(s) is the object moving with its greatest speed? ambi-f w*a *k055 cxgbw/n dw4


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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 t,gk smo f0txrrw j985 ;z3qho0qx -iw(he position vs. time graph provided. During what(gjkt;r8fw090x o,ziromw5x 3q h-q s time interval(s) does the mass have zero acceleration?


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