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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 aro t e;3.fmo9y ltsu x4fany/b,7trc0,l und a circular path of radius $R$, if the particle makes one complete trip around the entire circle, what is the magnitude of the displacement for this trip?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.01: The change of distance pc683g4dtwso a er unit time without reference to a particular dirdwo6ct gas348ection 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 onu d(k;d21tuqu )fq6cke lap around a circular track at an average speed of 50 m/s and then completes a second lap at an average speed qu(uk2u 6)cf1d;q tdkof $V$. The average speed of the vehicle for the completion of both laps was 80 m/s. What was the average speed $V$ of the second lap?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  95.03: A toy car moves 0.80 m in 1.0 s at the constant velocity. r.q*+he7nrzb p31wlz If it continues, bp nh1e3r7r.lzwz *+q 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 stationaryg* 77gmsda.r9uco pq6 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 ra7*7 crg p m.9gduasqo6te of 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 400 km at 80kee4 .6jzpf1i km/h and 400 km at 100 km/h. What is the avji f1e4e.k6p zerage 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 q/o cg -y,5x88a72gk8hskr v bac mzz0d-e5eemotion of a toy car traveling along the x-axis. The graph shown below is8grzg kczx -mceq0ve 58sy7a-ab8,d hok/ 5e2 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 refers to the motion of a toy car travj./8 oi)3qumwvdg o7xeling along the x-axis. The graph shown below is a plot of the car’s velocity in the x directvd i78m3.w/qogju)xoion, $v_x$ 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 rsvv*7an0mx s)sdy (w.ls7;b toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocitsbrsm7(sd n l)xas; y.vv0w* 7y 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 flyingtsxyu0d 4llnz5 )10hb0 vzp0j f p2,ih due south for the winter. At what point did the duck stop xlj v4y, f20szzp1ht bn )l5dhup 00i0its 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 b ;f hl(1 sv0zci6izvi+elow which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the average velocity of t 0+1ch sz 6v;lii(fzvihe 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 rv1ynzs gazq+w5:27r lefer to the diagram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleration durs 2rql:v5 17 yanw+zgzing 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 object withk5u;:al-0yjk, ,vb mf/ ofotob6/ vk a the position time graph shown in the diagram at righ6yf /k -k ,bm/5tavoooauj ; l0bfv:,kt?


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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 following information. An i3xta kafl . i9ud5g;2jdeal elastic rubber badf3a.j9 2klt giuxa;5 ll is dropped from a height of about 2 meters, hits the floor and rebounds to its original height.
Which of the following graphs would best represent the distance above the floor versus time for the above bouncing ball?


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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.29: The following questiodkn6yy08o vc 1n refer to the following information. An ideal elastic rubbe01kynd6v ocy8 r ball is dropped 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 wisyg8m p4ikn/6;k gko z+ r9-b*jj3rljth 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 foll,qu2a)*byv6l ctwu0 muj, w,u owing 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 hmwk 5qasm jq/o bg.4k2k46 8 ;t,lqbpfollowing 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 fieiwgeztl7sm753):r0m zy5 of2 g5n nollowing 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 scenario k7ehzst3.wx3: 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, acrosslul98d:dapc07+ z 8 t wwif7nb a horizontal table top and off the table edge. Which of the following would best represent a graph of the magnitude of the ball's acceleration a: wufnb t7dpz88w7+d9 lli0cvs 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 dist)zx12 d0o9w-ngxgt tx5bq 1wt ance and time for an object that is moving along a straight line. What is the instantaneous speed oo-g ) xbt5w9z1 w0x2t1dtgqxn f 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 rep q:i0lt5qe6 vlresents the relationship between distance and time for an object that is moving along a straigh 06:ietqvl 5qlt 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 i71f+jqb m ueh;l )ubzxfe1-j 8s thrown straight downward on Earth 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 fz81- 7;eemlbqb ju)f hxu+j 1object 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 q k 9ul(o8htwfk: ur07represents a toy car starting from rest and uniformly acq9:u( tflh0uw 8kork7 celerating across the 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 uniformly at.x d (ru+yo(spe5 hi( *ovw(hcceler h(+e(ivtro.s5( h*xu( wdpy oating across the floor. 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 represents a toy car l2:14c: f1ihdmv37 xhhzw tvpok +b xeq;,.ijstarting from rest and uniformly accelerating across the floor. Tvt:h 3fdj17m x b o12 ,ixh:;.icwe4plvzk+q hhe 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 accelerating ball. Tk(js.(t :ghlp,*jnjfabz8 e 0he position of the ball each second isjh,l jt8*n.s(bzfj:0e(p agk 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 acch *qdtlik: *q-qyi4mi -44vi+7ylp dpelerating ball. The position of the ball each second is indicated. dl*4:*tiql+ mvyi4pk hqy 7-ii-qd 4p
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 q-w6 +rtn :uvuclown on a unicycle moving in a straight line is shownr6ntu + q:-uvw 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 circus clown on a unicycle m 31iux1zbj/-9 ve+l kejnsx9boving in a straight line is shown in the grap9jn b-bvke z es+3u lxx91/1jih 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 the surface of th -6jhr5rss 2sye 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 x:g2n8doax ew pdlm*ca: ;e7, top forexd: aoga; dx*7 n:w2epl8cm, 10 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 f2a1 ep,u dsvf)g )6ixrs;s8 zon a table top for 10 sf,gi 2sesf zd8ars)xv)u 1p;6econds. 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 accompanyx i.7g2 p40k mcv/odg oi-e*tying graph describes the motion of a marble on a table top for 10 seconds. What is the marbles average acceleration between t = 3.3 s and t = 3.8- .g2eogi v/x07oy 4mdkpc*ti 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 accelerahxms,t, xl 91efou2-e tes 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 downward with a speed q )dkdak 5,lg oxt0je1tj6,) eof $20.0\;m/s$, takes $2.00\;s$ to reach the ground below. From what height above the ground was the object thrown? Ignore air resistance.

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.03: Which of the following graphs could correx4 og;/q74rk dtvh8mscjm:cez ; (n;p ctly represent the motion of an objx :n; s cp74cq(m zmo8gehk;t;dr vj/4ect 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 motionm85gq.z seo yl4v log(/w.xm mkz.e3 , of a toy car across the floor for 10 seconds. What is the acceleration of the toy car 5y8glx4l3mo / ze..( mo svgw. ekzm,qat 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 g w3kx(6malid.raph describes the motion of a toy car across the floor for 10 seconds. What was the total displacement of t3.i dk( amxwl6he toy car for the entire 10 second interval shown?


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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.26:The accompanying graph describes the v b4 rmephok- q+o*;-o bx:w7hmotion of a toy car across the floor + 4 pev or-bxhmkq-:wob;*7ho for 10 seconds. 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 acceleratxh7o :v)-cau dw2-rvaes uniformly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choiceuvvda-h-)ox r w72ac: s best 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 z .n f9kg /oukg ;,tnfu7,j;bupj6gl9time curve shown. Which of the following statements regardin 9,gon 6b .p;fkf/l, jg9z 7gkuut;ujng its motion is NOT CORRECT?


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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.17: A toy car moves along the x-axis pf7uwo;0w/nlt 87 7ge2sqfeu e0l 6qwaccording to the velocity versus time curve shown to the right. When does the nfq 7fow p e l;6g28u7s00qeul/we t7wcar 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 teah6/ v+-yn j x5uyj id3lvr qpu5;t;n.nnis 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 inteia +j.lu;tqr6vndyp ujvy/-5 x5 ;nh3 rval 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 at 2 jmjd9rmgfgif5gc8r k*4zne7/:uj*40 enf nd traveling toward each other. nkn 4*jjgf9g2:fd07 8 /e*mf4c rzjretmu5gi
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 accelerat- mm(szl+hjau6 g5j/ kion is positive and incre z 6mm+g5k(alj u-hj/sasing

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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 j(z .u/:8 sbvejs*alp* p sr4.pe5eycaverage velocity is

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.18: For any motion in two dimensions, which one of the following choicesi sj6s)/uef(az3 nc7xpn s)o7 identifies qu(s j f )inzn 76osse3upa7c)/xantities 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 -, h*jnqevha-r9gh+w $3.0\;m$ 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-tim0 0r50tqqf yzb)utfb *pu)9 tde, $y\;vs\;t$, 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 tovjuu/m07fpj* swqx3e5,g8 kgtal time T in two 7uem/0ps3w jvf*8 gxqkujg,5 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 str/ nsff3ya.eo;9b8sz -ejd.xcgu5ji 2 aight track is shown in the diagram. The thick line repf ys5fxbd..j3; e-9js2noi g/czu ea8resents 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 mo/e f;3 v f /1wos9yhim4d9p+*jkimltction of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that th 4k13/fjfwm+d cvp*em lyiit/s;ho 99e 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 l)dk 1 :nkxj*i qmvt60i* tab0of an object given by the position vs. time graph shown. For what time(s) is the speed of the objedntb*qikx a*01lk6j:im0 )vtct 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 o b4k0cfvlpw16 f an object given by the velocity vs. time graph shown. For which time(s) is the acceleratio4lvk f 6c01pwbn of the object equal to 0?


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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.24: By computing the area under the acceleratioovx/pr.pr m2l6w2c y fcp ,i*9n vs. time graph for a fixed time interval of an object’s motion, what quantit pcc6plfym 9./w*io p2,vx2rry 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 withl* t;ww v /ux/i:4 afqwh24rqc 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 rbe0i 5(vc* 8aia6pu9 p cap9otwo 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 relen ;d a7:*itojcased 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 06k1f+pome yt 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 yzjh0you2t;-n00zt c graph of a particle moving along a horizontal axis is shown. What is the 0htzuznt y;co0 20y-jtotal distance traveled 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 i)gq.ay tw7 mg.9jls3, 7ls v b6f+irmydentifies all of the listed situations for which thesy+l gltj byag) r. m v3wi9smq.7f,76re 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. tima; buj ss 2;zudq3* hlaop,2+ue graph 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 maximum displacement from its sz u+slhas3d2 b*u;oj2p;aq, u tarting 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 z8keuk- swntd8mx1 e)*m2r7wand its velocity along a line vs. time is graphed. Which one of the following ce *k zn emx72)-dtmuk8 1swwr8hoices 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 tae-1yivv6 7eiw1+ v mkhe right on a horizontal track, each with constant acceleration. At an instant of time, the information aw11a6vv +kev-yie m 7ibout 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 posiki0 25km;:pwgy6jwpa/1m eebbfw6 p6yr8*xbtion $x$, 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 the following chojnt13gs3md ;6fp+vodi4owyx7w,em /ices correctly descri/o3 xw+ym ;op ng 47tjv3i,1m6wddsefbes 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 des ,puh.ez +6wd5zociroy 3q6 1vcribes the instants of time, at which the car and truck travel with the samey,uz1636zqipw5+cde o.rh vo 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, ea1rv3,vz w9fwdsb 3 a5m87 fjupch 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 choic m9raw7 pu3 vs8j f5zv1dbfw3,es 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 an object moving on a horizontal lqddfh 7k1 8je3;s /uoxine is shown. At what time(s) is /q kojs3dh fxd8u1; 7ethe object moving 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 the x-axis following the positionvjgv2c /r7g0xyj(h g1 vs. time graph provided. During what time interval(s) does the mass have zero(7gg/v jv0c yj1 2grxh acceleration?


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