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习题练习:Physics Bowl by Topic 2: Kinematics - part I General Motion

 作者: admin   总分: 72分  得分: _____________

答题人: 游客未登录  开始时间: 24年03月31日 09:50  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.10: A particle travels at a constant speed around a circular pu 17zextl5 ,epath 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 wi)t10 +x. xwls ugh2aitthout reference to a particular dixt u ts+2wix0h.gla) 1rection 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 a+shmo+k 0.h vsround a circular track at an average speed ofhs0s+m .v+o kh 50 m/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 move7v2y9*n5wjs.ow kwq26 8 nsexboug( ws 0.80 m in 1.0 s at the constant velocity. If it continues, how far will it travel in 3.0 sg2bwq 8 uw5( wo*oye9nwkx26 .s7jsvn?

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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 stationaryga8* c hb b,l69pzwr-e 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 ehb9b*-w zac 6l8pgr, 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 400 km at 80 km/;oyv 79fkh 07+f9nv) ss wx9ebxhs+urh and 400 km at 100 km/h. What is the average speed of the motorist on vs)+wu;x+9bhf k hxf9ssnv 07 e 7ry9othis 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 the x-aa:23+;7tqzu leb xm3cktz2 rmez:( ip xis. The graph shown below is a plot of thek zta7(ep3mrucmzb:e 2+qxlz:ti 2; 3 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 of a toy car traveling along the x-axi1zftdi ovq- qbp7 )+8ys. The graph shown below is a plot of tpqb8q v-)tf+oi 1dz7yhe 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 refershl7m.7ewmal , to the motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s veloci .lh a7w7,lmemty 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 :hz +ha xc)5sj3, aco s2hm.slvs. time of a duck flying due south for the winter. At what pointchm2c,s)lh s x aa3+:z5ohsj. 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 shows the positifsnq(twc1*sb f 8+w3won and elapsed timefbw(+ tcs1*wn3q8fw s of a car starting from rest and uniformly 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 which shows the position and 5r;r31xv g1trrdrj* f elapsed time of a car starting from rest and uniformly accet;g rrrj 1r3r5 1*xdfvlerating 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 velon/4) c8ijkgkjw w4.p/qmjk 8j city time graph for an object with the positio8. mqw )nk iw8jgk 4jj4j/cp/kn 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 refer to the folld)xw rlo6u m0e3h6bysev/ux(kq w )5;owing information. An ideal elastic rubber ball is dropped frw6 / wx)ehodr;kl0y3v6 q euux 5smb)(om 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 inform85 5abx w+j0 -4e+4 5iwtjquc6v yl vgxyfoi2ration. An ideal elastic rubber ball is drop+e5j4fg vvl54t wyoj0r uwxy6-bi+2q5 a ixc8ped from a 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 travel wi9n nte/0fe ed0a kzf-0th 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 w6 ( zutk5rf6sx,95i - eqpgkwto 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 to the following scenario: Atk (oquh3-srr,9v xoo k;i/oo* $t_0$, 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:y0forsdi,-r85+w+q 5o 4w00mofj fxsbvd t-y 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 scenari cg 4wao91k3rjb49 yxuo: 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 hori2e6qnv;0 qxpipl 3 ca+*pd *njzontal table top and off the table edge. Which of the following would best represent a graph of the magnitude oa2 iqv *ppdjpnexq;n*l0 6+3cf 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 distanv(ekk7q.q4zll, cl d4ce and time for an object thl ekdlkz4q 47c., qv(lat 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 relationshipc/c3.a :i)ykmg ua2t y between distance and time for an object that is moving along a straight line. Bca3ciyukmt)g: 2a/ .yetween what times did the object have a non-zero acceleration?


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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.07: A small object is thrown straight downward on Earth with an ;mc/a-9tuo:j eogtzn fxh( /4 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 jef h:9 o/-cgz;autxn 4 otm/(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 beloix vap9yv2bh ,ek9lxge (9d..w represents a toy car starting from rest and uniformly accelerating across thlaib(vgp..9xh eyde 9x,9 kv2e floor. The time 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 car starting from rest and uniformet0;g k+k2l ycly accelerating across the f;ctkly 2e+0kgloor. The time and 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 repre lv+1;k7 pm8osg/cqn mh u(j5zsents a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown in the dia5om1 ; unsq z+(m/8gklpvhjc7 gram.
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:r n.k s6dfw (kv m0xq26wlo.j uniformly accelerating ball. The position of the ball each second isw06.vn6xlk.(qf w mo rkj2 :ds 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 the b 0faze0taa+o5all each second is indicated. aa5zf+00oate
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-4 ;vpbceo ot-ne is shown in the graph o4-tpc -vboe;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 straightep:c vo4tmd74qd 0(zpp; l5dd line is shown in the graphp0o(clqvde4z 74 mpddt;p d: 5 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 f + *xvrvz07nk9rlbcj/ reely in a vacuum near 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 descr( iy8:yn-zu7 rzxqa1m/p3ch l-ve5k mibes the motion of a marble on a table top for 10 seconds. For which time interval(s) did the marbleu/yp7a8(zzxmie:-5y nm vlcq-1h r 3k 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 g;ezd8a,,8*i b;rxf;a zo oivs raph describes the motion of a marble on a table top for 10 seconds. For which time interval(s) did t8di8,a e ;sz;;obo arv*z,ifx he 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.1 7 f3st7;caue,yzu +q u)o i-egtjnx marble on a table top for 10 seconds. What is the marbles average acceleration between t = 3.3 s and t = 3.8on)t fi yz- 7ae+uqs ugx.,u;jt17c 3e 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 f ze+87ia:bmia71id g uniformly 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 dony/k acwtr(gtme2+9 *wnward 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 r(( un eih7 hhf*ok1: s+pcg.o5 mm5ddcould correctly represent the motion of an object moving with a constant speedo57dfh(re u:* dcpo(hs+5hg inm1mk . 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 moti0 cj- i*wt(urbon of a toy car across the floor for 10 seconds. rbci w*j- t0(uWhat is the acceleration of the toy car at t = 4 s?


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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.25:The accompanying nrj6c o) 2oh 5n- luz*nd9/xvograph describes the motion of a toy car across the floor for 10 seconds. What was the total displacement of the toy car for the entire 10 second interv2doho*xo n)lu9 r/jvz-c56nnal 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 floor + wsvkrbnu-5ev qq9* )for 10 seconds. At what9sqq bv)n wke- *vu+5r 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/hr to 60 km/hr in 4.50 s. W(d hm9wo0vbcz9r z1 c3(+1 pijyt/f hrhich one of the following choices best rev /+ytr113iz(d m( hwbrz9co0p hc9jfpresents 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 versusmg.6 joed 0jmzem 3k92 e2ph3j time curve shown. Which of the following statements regarding its motione3 2hjee jj0 dmm6pk9.g3ozm 2 is NOT CORRECT?


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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.17: A toy car moves along the x-axis according to the velocity versus tnwa b 1;w 4yphfw5j;2time curve shown to the right. When 4tfph5ba;;w w1nyw j 2does 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 mo8cjd70yc 0ex6cp x:xx31 mrsh ved so that the angle between tp 0xxccm1:dhr0s 3c6xe7j8 x yhe velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true about the tennis ball during this interval of time?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.03: Two automobiles are 150 kilometers apart and traveling toward each othg h-o(nw avz6w; wfr.wa- 9u5her.nh-w ;ufh(raw95wza- og v w6.
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 )m 4,s/cp5 xnoyiit8o-axis. When the acceleration is positive and incrony/co i5 8ms 4,pt)xieasing

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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 averag(q lthl: *nvv0kkm 8w5e 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 ;tpmzfyk/, -n 8ncx1hdimensions, which one of the following choices identifies quantities that mu-p/kfz,;8ymt chnxn1 st 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 moveso dy2)5pa u5imexzz50 $3.0\;m$ 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-time, 1p vw+a3comly)t31 tt$y\;vs\;t$, 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-dimensi16 dqv3ubrj (oonal track for total time T in t bvrd361( qjouwo 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 mot( ,bi;mc,fbex .6 mccmion of a car on a straight track is shown in the diagram. The thick line represec fcbc (;x6m,i .m,mbents 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 the2 lxq(nvpj)c o8 e9euqx0svgfx: 5,3z motion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that the car starts at origin qx)3jnxv:xz5(82pg ,sofue qc 9l0ev$x=0$. 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 d lt l);o-+n;d7ozcdy an object given by the position vs. time graph shown. For what time(s) is the speed of +d ;c-nl)d ltdyz; o7othe 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 by the velocity vs. time g e7aa.0xs xl 4aodqqnu8w3i:yo *m4j/raph shown. For which time(s) is the acceleration of the object equal to oi3nx/axyqe l4o8 w74 dq.0um s:j*aa0?


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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 acceleration vs. time graph for a fixed twp5u0g jj4q7 (ah(fn nime interval of an object’s motion, what quantity wap (0uf47gn hj5(qnj 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 increasing speenq i i2q9uo2h,d.
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 parts:1e1pd,xdskj rf omov 2*24 x2/iadvo0
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 releasay;w9m1pf74nj i(yg ged 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 rele1m)xhyb v6x q 92jkm1lased from 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 moving along a h-5f) nm:oar/l/pni wa orizontal axis is shown. What is the total distance traveled by the particle from t=0 to t5 /fln:o mwa i/)aprn-=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 choicttm:hsv8 q j83es correctly identifies all of the listed situations for whvstt m38qh:8j ich 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 jih) .aug4ag a( awba.yeq 098vs. time graph for an object moving along a line is shown. The object starts from rest at time t=0 sy )(e aa9bguha4jw 8gq0ia..a. 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 alonif 7r9etp 5ucc, jt6i+g a line vs. time is graphed. W,ir67cjtcp ifet 5u9 +hich one of the following choices best gives the proper interval(s) of time for which the object is moving away from the origin?


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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.09: Two cars are moving to the right on a horizontal track, each with const .x 5r4fnc4by1j/evs dant acceleration. At an instant of time, thsc5fvb4ry4nxj.d 1e/ e 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 vfm*6oaoiwmlx yt4 0, w4z )6a$x$, 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 t 8 e(8ulup u7a:;3q09ocghxn njsv1iehe following choices correctly describes the relatiocx9hnon3v jp(;08gu s8ee 7 1:auliqunship between the average speed of the truck to that of the car?


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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.42: Which one of the following choices best describes the instants 7 d-xs.zyfd(uof time, at 7 yds(u-fxdz.which 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, eatf 6+lc 5ypg6+pt;k mgch start from rest at the origin and will move along the x-axis. The acceleration vs. time graph for each car is shown. Which tmcylpg 5pkg6t+6 +f;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;d(s62os0qoc qct(r20h f trq . time graph of an object moving on a horizontal line is shown. At what time(s) is the object moving with its greatest speed? c r00scstr q(t;6qd(2oq oh2f


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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.08: A mass moves along the x-axis following the pos5tp/ pfp n,g5cition vs. time graph provided. During what ti p5/5 ftpgnp,cme interval(s) does the mass have zero acceleration?


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