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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 anp lv9-h 6kflof 8p*7r constant speed around a circular path of radius $R$, if the particle makes one complete trip around the entire circle, what is the magnitude of the displacement for this trip?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.01: The change of distance per un1lbx2u5w v6, /oefu4or*ro jp it time without reference to a particular dire* vfl 24ob,u rr ue6p1oxj/wo5ction 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 around a circular track at an averyx)c7*l tw2 aqage speed of 50 m/s and then completes a second lapcy* t7a)wql2x 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 0.8od8oj8m mek m9u2nj,- 0 m in 1.0 s at the constant velocity. If it continues, how far will it travel ine m8-,2 oj9d jumon8km 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 slidi87mzvqa 5+) o annqq1dng at 5.00 m/s to the right across a frictionless pond. The boy then turns and starts walking on the plank at a q) 8naq m+5z 7qdvoan1rate 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 travej 89v*dma9 gvels 400 km at 80 km/h and 400 km at 100 km/h. What is the average speed of the motorist on this tripjv*9g9 8 vedma?

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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 xog dh z vmp63g(4qei8vxx-h),-axis. The graph shown below is a plot of the car’sg3 z()4 m ivq6xhd -8x,gphevo 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 0v;nljq:)a+w,ief * i/bo6 k vxndp+o toy car traveling along the x-axis. The graph svd +xl )ni,ob/k +an0p ;*vwfi:qj oe6hown 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* lzihiir6ge. 6qd55u car traveling along the x-axis. The graph shown below is a plot of theed56 i56i qgir*z.lh u car’s velocity in the x direction, $v_x$ versus time $t$.
How far did the car travel during the first 15 seconds?


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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.15: Given the graph of the velocity vs. time of a duck flying due south for zrzjm24e:v0 mnnp6qg 7*o+tkthe winter. mp: mn 4ot0jqn2k+6reg*7 vzzAt what point did the duck stop its forward motion?





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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.17: This question refer to the diagram below which shoz d0vf13p yiu80yw+ lhws the position and elapsed t1+ihzyd38w uy00fp vlime 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 refej4 y ck sv5a+jz wsjv b)*z/l2(g;z7dqr 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 accjsy z(k;)gc27w4bzsdv / 5 jqljvaz+*eleration during the entire 3 second interval is closest to


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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.20: What is the shape of the velocity time graph for an object wit)3( mb;jqmoa -8vs4n6 ec vuppo ta1o2h the position time graph shown is-m;q6mbo 2en(4 popv ta3)a v8u1c jon 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 (n/5m n2h faed :49tsoynn8vi following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits thhidn :t so5mn28nn/ e(9 y4afve 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 refexvq. muu-km pj*2;gw6bv-o o,r to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its mmok v,qu-.xv 6*u owg-j2p;boriginal 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 ofob)vxb, wwr wy2r) :)e $v$ 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 py jia* sc)(2nfollowing 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 scen.j d s,t/k5l)jcgyty:k) aok5ario: 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 followahwq u +3i j) ,i7h8eltnk5zh1ing 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 rd(jpj2vvtw p-f t*ozr3fi17 /efers 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 yu d5mru+ dbc572y:viramp, across a horizontal table top and off the table edge. Which of the following would best represe2 dr57: diuy mbcuy+5vnt 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 relatiorp;,*bkdkanm hf2 (y-i*nr2s nship between distance and time for an object that is moving along a straight line. What is the instantaneous speed of the object at t = 5.0 m*r -hrkbankf d,s i*22yp;( nseconds?


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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 relation3a +g4.yhm*zb 8 oi4,dsc cpfnship between distance and time for an object that is moving along a straight line. Between what times did the b,3 fypim onzcgh +cda*48.s4object 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 ie gtez+d6 pt;8ek q;qaqh7o.(nitial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air g.pe qo6d7tqke ( z;h+qa;8teresistance, 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 be3:w4fi qera +db an-nxeb*z(cry8, ro88xn+slow represents a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start ae n3qb+c xnyd:fbai-n8z 4rrx(r eo,s8+8aw* re 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 startpe(vaexf 8+ s.x3 po3jing from rest and uniformly accelerating across the floor. The time and distance traveled from the start a.ao expps8xv (jf+33ere 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 b( nv cdb5p.h2uelow represents a toy car starting from rest and uniformly accelerating across the floo.52cp(b nhduv r. 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 shoesmocft 0iy a8z+.1he,ih 0izy,c6b+ ws a uniformly accelerating ball. The position of the ball each second ,z ayesf+ m0zc . boti,+86e01i chhiyis 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 unifo/.f2wpu k(1 *k7yjis(xkjc furmly accelerating ball. The position of the ball each second is in.(iw k/sufp* j71ufxckkyj (2dicated.
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 ci, /pz ox0a2c(b fsh7kn2df:pzrcus clown on a unicycle moving in a straight line is shown in the graph b7f z(adzp/c hnf0, p:xk2os2below.
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 cs.o19 m)hyu2wd fm/olircus clown on a unicycle moving in a straight line is shown in the graph be dml.2yw mshou/f1o9)low.
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 sulxij5pun n,joi z 352-rface 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 accompanycoetipptga1n j:e2b,25bz4. ing graph describes the motion of a marble on a table top for 10 second: zeib.g b2j 5potec2n 1,4tpas. 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 a table top kf,rrjd wf9pp.;b3t 6x4 b*rn3gdln (for 10 seconds. For which time interval(s) did l3f6n *d4jpkpb(rwgf dn,b ; x.rrt93 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 mot -;;ld9wrybbgbf5f;u lqrt43 ion of a marble on a table top for 10 seconds. What is the marbles average accfu gtbb ;flw49b;rd3lq-y ;r 5eleration 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 r:.+q4d 4q)b*tu)nmnp a xcw/9anf mbjest 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 downi57ciixy2m.ec;pyh t1 c ) 8y2lxgo x9ward 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 followingux8-shs s5rq 8k *;aev m(uj+n graphs could correctly represent the motion of an object moving with a constant ssvs8as -+5r hu jemn 8xku;*(qpeed 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 motxs jltn2m e,6i2z8yk3 ion of a toy car across the floor for 10 seconds. What is the acceleration of the toy car jn e,z3 t2lyk2x m6si8at t = 4 s?


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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.25:The accompanying graph de xg7fs:l*71gdh x xb*nscribes the motion of a toy car across the floor for 10 sexg7x 17lnx:*f* sbdgh conds. What was the total displacement of the 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 motion of a toyh hflg+ wk l)2jpl-,/h car across the floor for 10 seconds. At what times or time intervals must the net force on the toy car be zerf,hwlkp-lh /h )l+gj2o?


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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/iw3 s;)a l jw7;if.ehshr to 60 km/hr in 4.50 s. Which one of the following choi3;. ;aiwhss) i 7flejwces 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 (kjuff l zc8 )ec)d(2h5v pk,wtime curve shown. Which of the following statements regarding its mo(pf ekwh2 cjfkcz)d (v,l 85u)tion 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 a,errgz5,j8ff4+7 jk v-, d4gwcgybwdlong the x-axis according to the velocity versus time curve shown to the right. When does the car have zerjvdwf,d+4 bg 4-fz gj8c7w,,rr5 ygeko 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 angle beta7gg(79wi blp ween the velocity and the acceleration of the ball is kept at a constant 120 degree. Which stgg7b(iwl ap 97atement 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 k)7uumd.8m8nhul a z(r m14g qxilometers apart and traveling toward each other. gquh8z(ux7.18mn l4rd) aum m
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 positive an29;/bdf uj7rj ;qa amtd increasing a/; a2;udjqtjrm79bf

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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 average velocity isuo 7 t:hmwbkb9;rvg/:h4v 3ij-1cfz x

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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 dimenszyoom0(km g3 5ions, which one of the following choices identifies quantities thato zg3mmk5 yo0( 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 j07g yl/btzs 3nj q55e$3.0\;m$ 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-tg **aq7.k bgrj qm. 14wol7uftime, $y\;vs\;t$, 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 time T qidc /hdz*mrc 9f o3gk7k2( b;in twohzogd*f 3ri/(k c9mcq b d;27k 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 +5y+o. ;uma ww+u sgcnik s 3g4f9uc1qthe motion of a car on a straight track is shown in the diagram. ++9wf g.sq w ausumkc4yu3nc5;gi+1oThe thick 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 t0bqb:i7h-x rihe motion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assumi:b7bhx-0r i qe 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 an object given by the position vs. time g6d0y j4n-r8u7h c5 rjhzc+tkrraph shown. For what time(s) is the speed of the object greatest? r + 7-hcjny rdj5thr86kcu0z4


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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 v 2ir1zjpy)5draph shown. For which time(s) is the acceleratiozr5p ivd21) jyn 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 acceler+zqo; nx5ns ::anwv (cation vs. time graph for a fixed time interval of an object’s motion, whatnx :;+ 5v:n oqzn(csaw 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 t)2wxn6t4i yo along 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 p.n- kdvy;u-b jbpg7;two parts:
Part 1: it travels a distance of 800 m at a constant speed of 4.0 m/s.
Part 2: it travels a distance of 1200 m at a constant speed of 20.0 m/s.
What is the average speed of the car for the entire two-part trip?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.02:A small object is released from rest and hq 7jt- h8*y+a1evynareaches 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 ground iqfz77 w,*di kqn 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 lcm*a fy+ jp54horizontal axis is shown. What is the total distance traveled by the particle from t=0 to t=1* cj5+py4a flm0s ?


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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 corwd u8l217fty zrectly identifies all of the listed situations for whicz1yd t 8u72wlfh there is a non-zero acceleration?
Situation I : A point object moves in a straight line with increasing speed.
Situation II : A point object moves in a circular path with constant speed.
Situation III: A point objects moves in a circular path with decreasing speed.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.32: An acceleration vs. time graph for an object moving aloc8i5bm2+s cko 8 ;pn-qa5dtw:sq tvt0ng a line is shown. The object starts from rest at time t=0bkdn8c 5sqit-t8c 5aswmv p ot:0;q2 + 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 startsd(qa12o,me6-ffyr2v) ro w se at the origin and its velocity along a line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of timero2emr2)6 f,f-dq1os vwa y(e 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 ;zsi1( vhk3zze.02 n 4pymdmiwith constant akd;4znh3i0p1m m2 (se.izzy v cceleration. At an instant of time, the 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 poq09 (mwvi,yvj6dsr x5sition $x$, 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 ntd7s, ( ugi,8i*6i. hru :vka+ek s5mm6fdmcof the following choices correctly describes the relatioa:8ui dd5me+tm 6ri*sks, u,g mi(.khnv7 f6 cnship 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 tffpbvljc1h5j 1hfw- bxh( ) +s)z (+tthe following choices best describes the instants of time, at whic( f-ftf+hlh(cvb j5b)zx swj+p ht)1 1h the car and truck travel with the same speed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.30: Two cars P and Q, each start from rest at the origin and wil3. wfd-mj+etu l move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the following choices correctly identifies the relationship for be wtj -u+dmf.3oth 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 objap1x.p le/qz1g3 ag :nect moving on a horizontal line is shown. At what te 1pxl/.3ag z:g1naqp ime(s) is the 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 position vs. time grap;80ti(ls)5p jaqqg q;em kvw f*1djjjs,* ko0h provided. During what time interval(s) dglwki8;0q;jej )01qf,mt(vj *ap *d kss 5qjooes the mass have zero acceleration?


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