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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 circular 7j pt pp paw0x9qj8 63mbr)1f7*lwjsypath 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 xt4(nt( (b0 /vzeyjazcw*)tb per unit time without reference to a particular dictt(e (* b 4tw(0 nvjxazzy)b/rection 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 5xj(wi vatm*,d f3 g z1ct,z4wone lap around a circular track at an average speed of 50 m/s and tvf3wzc,wj tg,dxm( 14a* iz5then 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 2fgqb.i:es q- hg5-ip 0.80 m in 1.0 s at the constant velocity. If it continues, how far will it travel i5gqi.sq i- 2b:phf -gen 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 slidi8 dd(lu0t dgerq;g te742g2dlng 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 plal2dr tg2qg t(g84dleu7d;0e dnk. 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/g h6kgzoos.,fib:s k c:/ /ew8h and 400 km at 100 km/h. What is the averageswgso6oh i,z8:.kc: //egkf b 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 traveling along thg,wbyf9qtnv) t4.b 8 ye x-axis. The graph shown below is a pf8twbqn9 vy,)b.y 4 tglot 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 refers to the motion trhkm l(g+c2l)uq 3y2 of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the xl2+r(ulq kt3)2h g cmy 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 redyoajq *mw2ds z5l7,+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 m j7d,+wy a2oqsz 5*dldirection, $v_x$ 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 sou x5 pbht-41m1 hxf.gudth for the winter. At what point didp4 xhd 51gb-1.fmut hx 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 shows the position and elaybkv un: )z3zw-j(s;bpsed time of a car starting from rest and uniformly vb(jy)w-:b u3zsnz ;k 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 diagram below whichp v)o:bt(qh p0 shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average accele(hbp):0 tqpvo ration 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 ot 2ay-n)9 /wkxsnctz7 f the velocity time graph for an object with the position time graph shown in the diagram at /sz2y at x-)tnn9ck7wright?


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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 questionv 7i/r x9iz(,bjung5l refer to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and r ,u bz57lxii9g/j(vnrebounds 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 inhnmdf 9px7 l7q)ep 9:s4upb9m formation. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its 4s:9 97pmmbu9eflxqp)p n dh7 original height.
Which of the following would best represent acceleration versus time for the bouncing ball?


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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.39: If a boat can travel with a speed of 6v;z 1w-4c8bpmcgl k w$v$ 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 +(7m7j 6ncykm em xlt/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 tispgb ks-, yoem i7 :l1z*a;q6o 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 scenzyjzwg5ph w:uc,n g9* +5 yh5s4jk ir*ario: 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 re3. 5wssv q:l2eip qh0wl; v8iyfers to 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.
If car #3 continues to constantly accelerate at the same rate what will be its position at the end of 6 seconds?


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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.33: A small ball rolls down a ramp, across a horizontal table top and of k) g.to1tp.-qgx8ysyf the table edge. Which of the followi)o1.kyqg8p .x - tygstng would best 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 the relationship between distan9j5s 9h qz8- l;hvdhn)n,zy bkce and time for an object that is moving along a straight line. What is the instantaneous speed of the object at ,-8h ;ns zlh9q)9hjznk5yv db 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 betwe4r*dixd04o4htc:(pi kw6 e *v+ tm atzen distance and time for an object that is moving along a straight line. Between ttcdz(p:m x 64* iweid*o4+ v0 arh4ktwhat times did the object have a non-zero acceleration?


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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.07: A small object is thrown straight downward on Earth with an init:o,m n laza:is* (hs,0sg ,woyial speed of 12.0 m/s fsn(ismshgoa,, ly:,:w0z* a orom 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 rux.e9w sc0 3jwepresents a toy car starting from rest and uniformly accelerating across the floor. The timj0 uws93xc.w ee and distance 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 c;pwgjw), rl0nar starting from rest and uniformly accelerating across the floor. The time ; ,0nw g)ljwrpand distance 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 gg1o86v4fh)f+ 8l7t pxufml; l f c6systarting from rest and uniformly accelerating across the floor. The ff x)68 vu4f s+gp8c6 l7lyhl1t;mofgtime 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 uniucs7 v*20waj7x 5 p-iguuj5laformly accelerating ball. The position of the ball each si75juu2gj *s clxw 5a7-va 0puecond 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 posvet35h6 bu4stition of the ball each second is indicate4 t e65sb3huvtd.
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 unicyc0: t8egoicn60mx6btj. iejs0+8t mjsle moving in a straight line is shown in thm00ist +.t66sjoncm8 tjex:0gei bj8e 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 circus clown on a unicycle moving in a strai r1d gfsud:- m:r+i:z)5pj 5 rh5chsykght line is show5r1 mi)+5rc :5ju :dp:z -hgdsyhkfsr n in the 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 ue-p0+o y3 f/qh7od*ak6wz oenear the surface of the earth

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.11: The accompanying graph describes the motion of a marble on a table top fo2aq7f*0rqtljb;6kfc ; vv)7r c0t zfer 10 secona) vfcf cfv7r7*z;qt2qkr;0 6etbj0 lds. 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 mo,64ftqb3c ji zv2dbtq f4.j6dtion of a marble on a table top for 10 seconds. For which time interval(s) did thet 2fqb jfv.z34q,db 6t4cj6id 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 a tabjebuvbi9x x/8/s*ooq.-sg/ s q pg+c:le top for 10 seconds. What is the marbles average acceleratqq:s* 8us bc+bgs.jo/ -v/oe9xg /ixpion 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 timy :x8k 8bn0gb6vvy4z tztm3v.e 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, throge:dp1e / nl+v8iksl1 wn 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 gradym,e*9s st qc+(c4 0 ma1zlnaphs could correctly represent the motion of an object movca als9y1c,* 0md4mnq st+e (zing 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 toy cai9su wyu68wjl k;,noozuzg -9xn.z3-r across the floor for 10 seconds. What is the acceleration of the toy car at tn69i9-uu;w.zo,y- 8 3uzzxl jsn kg ow = 4 s?


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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.25:The accompanying graph describes the motion of a toy car across duaclru: l62c z5wj)/the floor for 10 seconds. What was the total displacement of the toy car for the entire 10 second i lu u2/j :a6wd5crcz)lnterval 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 floonqtwwc j/1o+3i wf;k7r for 10 seconds. At what times ort i 1cokwq3w;jnfw+/ 7 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 uniouz9 q 2qqc(epj27 v+yformly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best represents the acceleration 297cy( v2j+eqqoqpuzof 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 following 1/x+gyt pg)h rstatements regarding its motx+ 1tphyg/g r)ion 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-axi-cd/af(ed 0eou).ilu s according to the velocity versus time curve shown tf ad. 0ol u)(ue-/deico the right. 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 ball is movo c2,zt+)p5pkj ct ld(ed so that the angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement ikoc pc(5 pz+,dt2jt l)s 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 apara ::.0avrqp1aqqtx.grd t ; /dt and traveling toward each other. 0ax1: .qdt q /:a.ardgrp;vqt
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 cox rmd(7u,g.gf y*l d)89n weacceleration is positive and increeg r(9ug.*d 7l xocnf w,d8ym)asing

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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 c22 vryh*2 adp35siahg0r y/gj/ ys9 quh2 :qsof 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 motionz8 ,ffj mre8:d lenr52)x58nnh/ hpyt in two dimensions, which one of the following choices identifies qhn)nr5zrl82t /eex8:h pfj58n ,ydfmuantities 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 u00;gzvam:e;+p ibvb1 lhlww b8j/4h $3.0\;m$ 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-4,qyg(j h;w.( jsynffu nk0u*time, $y\;vs\;t$, 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 w61/ )rlogm:brnqry ,for total time T iw) r lno,:r6 r1yqbgm/n two 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 cack)qam/)t h s)r on a straight track is shown in the diagram. The th ka)) m/shqct)ick 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 graph for the motion of ef5s;b1k .ktlfb6if u:84 mrha car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that the car starts at origi6m. r:utb8f5flbfk ;4k1esh in $x=0$. What is the average speed of the car for the 10 second interval?


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.08: Consider the motion of an object given by the position vs. time graph sho2gbkqf mx 6:dslz 30-qwn. Flk2-60q3:qxdsmb gzf or what time(s) is the speed of the object greatest?


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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.11: Consider the motion of an object given b y5**pkfk-;tm iq6c7 tk2vsvd60 dq tcy the velocity vs. time graph shown. For which time(s) is the acceleration of the object ek6sqfmkptt50k*tv-dv* d2 ccq7;y6i qual 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 u9ui; x th8)s bkg6n5art6 np.7hn7hqbnder the acceleration vs. time graph for a fixed time interval of an object’s motion, what quantity has been determined fon5hthsbq8.7bu n6rk;nag 6)ixh7pt 9r 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 increaswpkz0w8a ,2fe ing 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 fvt, y8mbxj3v;il8n2in 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+v0m8w7yoa xh6. ugjt is released 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 reaches the gril r h;svg ;i/oslh98 :n xbr)nw47t+hound in a time of $2.50\;s$. Neglect air resistance. From what height above the ground was the object released?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.17: A position vs. time graph of a particle moving al16dtx,ymduh0+vzv 0n*bovx , ong a horizontal axis is shown. What is the total distance traveled by the pvo,xz+y0 60dbndxvtv 1,*hm uarticle 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 li:fojf*f-9 l (lbne 7*t llpua5sted situations for which there is a non-zero l-:ub5 lal9 ponlt* jfffe*(7acceleration?
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 alontd50;fzfwp5:h jbh:2rg d a4 yr9ss,rg a line is shown. The object starts from rest at time t=0 s. At what time(j9fsr0gs:,h2z5 ady 5 wdtbpr;4r:h fs) 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 itsd+ q8t*61d/ ;s4icgsdscphr q velocity along a line vs. time is graphed d+s1dq6;8gct sc/rq*s4dp i h. 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 movingikg0 +lo qv(m/ to the right on a horizontal track, each with constant acceleration. At an instant of time, the information about the cars i0o( mv qkli+/gs 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 acuu9om46 qa2zbh/ct4uumwb.s 52 d9q 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 grabf13 mvt:irkp(w m5 w6ph, which one of the following choices correctly describes the relationship between the average speed of the truck to that of the rwp 3tb6m1m(f5:vwk icar?


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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 instants of time, 7zau8i4.sesd at whiczs7a. iu8 des4h 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, eixe nn.()ydw *aeq k-9ach start from rest at the origin and will move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the following choices correctly identifies the relationshnk* -eai.)yxde 9q wn(ip 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 objeca/ m owuxjnpks5a24(nvj 65c2t moving on a horizontal line is shown. At what time(s) is the object moving with its grea4xk2 (2 co w6njp5/v5amanjs utest 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 foll, imsutw0.p(q 5r8 syhd-z/ reowing the position vs. time graph provided. During whw,q0(hu-y ze rts85/pir dms. at time interval(s) does the mass have zero acceleration?


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