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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 path of r2n(pb l9w v9;,c huv z-cnav0bj:4aamadius $R$, 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 distaq:zdrg8;5a49xqgljj lp4d ;o/8 nzur nce per unit time without reference to a particular direction 4;gxnj; prr8qgo8ujz/9d 4l5 q dal:z 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 u*ud(eqye )l9,u3 pbztrack at an average speed of*u)u deqbulpz9 ( y3,e 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 moves 0.80 m i )wet2dk-5d + sdccy*vn 1.0 s at the constant velocity. If it continues, how far will icv-s 5*ke +cw d2d)ytdt 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 stationa c2gdvpci wa(*29hbiamd13m 4 h,ksb;ry on a 30-kg plank that is sliding at 5.00 m/s to the right across a ;(cgmpid,d k3a2hh *b49am2cwvi1 bs 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 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/h and 400 km at 100 km/hmm7 l4uls1 k0 f7w(wmlmhtd.k 7tl i*+sl0x)z . What is the average speed of7s*m.14 xzs0tulilt 0 lm 7hmw7 )f(l dkmwl+k 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 8) z vozjz icyr5+::/rcsahg1toy car traveling along the x-axis. The graph shown below is a zs ar+18 c/c:)vrzg5hyoj :iz 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 trave/tds7t4x 8md7uki b5w ling along the x-axis. The graph shown below isdusmiwd 5/8t4 xk b7t7 a plot of the car’s velocity in the x direction, $v_x$ versus time $t$.What was the acceleration at 33 s?


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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.22: This question refers to the motion of a toy car traveling along the x-axtbnl nvw;j+lo7c429-m y5 sruis. The graph shown below is a plot of the car’s velocity in the x directiw;o 5j7tb 4uy 2mcn vnll9-+rson, $v_x$ 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 fc hyymtit:6kf0)3 9ixlying due south for the winter. At what point did the duck stop its forward mo hy)m 60cf9ki tytx3:ition?





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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 t drl gwqqfm0h) h1f8:;o the diagram below which shows the position and elaw)0 gl;: rmd1fq8hq fhpsed time 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 thy 2 )gdi yy,k2)usy-hle position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleration2yysh-ly)d g 2) k,yui 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 with the po inrhaq5;: 5kke-kag6sition time graph shown in the diagram at right? aq:kghk e n;ark6 -5i5


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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 a4k0sgi,whd:*a z)v orefer to the following information. An ideal elastic rubb0woz :)aavs i *hg,dk4er ball 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 question refer to the following infz1 l9 )yihf 2fw5omz+iormation. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits theyzil1m2ifzh5o+fw )9 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 truk4fgfb5se e 1tj -41f)/urjhavel with a speed of $v$ in still water, which of the following trips will take the least amount of time.

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.01: The question refers to the 7wnszuxk2)+cr g; 1kf/rq zj)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 followib7,mu xhb lks4 5g3-rpng 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 scenario: +b: .dhl unrio8i +ju1x e-a-iAt $t_0$, 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 fa*hg osxm2c ;4+uleg7 ollowing 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 horizoc1qcv , fo)g:ontal table top and off the table edge. Which of the following would best represent a gra,c1 gqo)foc: vph 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 distance and time for a3 3wfegoj(.em.cq3 jnn object that is moving along a straig.(q. cj3ej3me o fn3wght 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 qer(cmg ct 4-962iwyj;bj e.b the relationship between distance and time for an object that is moving along a straight line. B4.yeq-t; wj em ijbb6cc(2r 9getween 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 downwardt,xe6m 5 c4j gtg+*dqh on Earth with an initial speed of 12.0 m/s from a position 10.0 m agg4de jxhm6tc 5*t+,q bove 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 represen. zeslz njtvx oy*r2g8j0,w 17ts a toy car starting from rest and uniformly accelerating across the floor. Thog zt8 z* 7.rx 0se1,njly2wjve 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 unif .koy-ut;2x2g;.:z;s oo9p zkwu aog uormly accelerating across the floor. The time and distance uzyu.tk2w s.;x9g:a k; g op2oo-oz u;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 starting from resge:mvsmc3,3 zyca ;vf6zh6k , t and uniformly accelerating acrosemv f6y33; kvma:,h6 zcc sg,zs the floor. The time and distance traveled from the start are shown in the diagram.
What was the instantaneous velocity of the cart at 96 centimeters from the start?


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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.08: The diagram shwc9yofa 57jlxye9 v( e55fd c6ows a uniformly accelerating ball. The position of the ball each second is indyj6fc ec vyla ( xdo95f9575weicated.
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 positirplq;pc835 v kgj(7v son of the ball each s83qg ;vrkj 7sp5pcl(vecond is indicated.
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 unint,ssq hj5+ qv9bdgb yr397vmm 0wl6 5cycle moving in a straight line is shown iwl b 0jqvgms, 5ntym3dqs b+79hvr659n 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 cird2;skx i(x kf/cus clown on a unicycle moving in a straight line is show; sxk(dk/i xf2n 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 freel94sxm75kvpkup 92ghx-n*gs o8joo -l y 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 describes the motion o+b qxfqx (1rm1f a marble on a table top for 10 seconds. For which time intervalqfxb1q(+1x m r(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 graph8 *e2( qbzvaftl( 2 jyqri/utgx8qp:; describes the motion of a marble on a table top for 10 seconds. For which time interval(s) did the marble have a positive acceebtqix;p( 8va2g q*jru z2 fqtly:8(/ leration?


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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.13: The accompanyingkc,9ldu)fr0 z 0i 91n(h d-mx zwlmbt2 graph describes the motion of a marble on a table top for hx(c9,r1 nf im0t9ld0lk)2 d-zzwmu b 10 seconds. What is the marbles average acceleration 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 u+n7rkc - l)r,b* 7rlrkj. zcbvniformly 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 straigtjl6 k ggn6d5.ht downward with a speed of $20.0\;m/s$, takes $2.00\;s$ to reach the ground below. From what height above the ground was the object thrown? Ignore air resistance.

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.03: Which of the following graphs could correctly repru+ nhq1,+ ubmsi6c/ lresent the motion of an object moving with a constant speedbc u+h1nrmu+/s l,i 6q 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 cad6nna7 + 9aityr across the floor for 10 seconds. What is the accelertia n697an+y dation 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 graph describes the motion of a toy car across xu*ya5/yjehcjh 0m .-the floor for 10 seconds. What was the total displ jh u* y.5xh0y-/ejmacacement 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 d cyu o4g++f1aof a toy car across the floor for 4+c1ua g+y ofd10 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 accelerates uniformly from 0 km/hr to 60 km/gg/vsvjn wr3 7e t2 5uya(td(5hr in 4.50 s. Which one of the following choices best represents the acnrgtdgsj wu( /e32at(vyv 57 5celeration 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 4uk fe rl livr89b:(y3k 1id3kversus time curve shown. Which of the following statement9ku 1y3e8vdrr kb(3llk:4if is regarding 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-axiu q/hg in.ws x6xrncjw7)9h bzi,+0)ks according to the velocity versus time curve shown to the rightxc+ whquh)ixwgj/ r.k)09, n 6z7sbin. 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 moved s ,oaawbv2 f96nrty (dac/,dk .o 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 tennckd v/9nyd,.6bafwt r2,( o aais 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 15w(pyu qz+;pg;u;ze +x0 kilometers apart and traveling toward each other.z;p y;w;eq+( uzgu xp+
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 movem6 x 9.p3yqvd hqve.ytvy;4c7 s on the x-axis. When the acceleration is positive and increasing 9.vyq. h6mtx vd3qp47yy cev;

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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 at8:aifc*71jqool j ,4z g ya,uverage 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 motioqm52/ rd(ttok n in two dimensions, which one of the following choices ident/kt(o m2r5qdt ifies quantities 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 rvmsy6 /kw3z1*n6m4cs jpo k* $3.0\;m$ 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, 1 :ch6tla:en 7y(+bq7axfrw0c6 ozsb$y\;vs\;t$, 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 a.1ukiz5o me:in two partk.i eu:a51o mzs.
• 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/7 *pxlxsq8vr yiz .fta5a/, y straight track is shown in the diagram. The thi5/,/xaxsv8 afz7 .tl py*yirq ck 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 a e3f-j/ j ;ctdfcar on a straight track is shown in the diagram. The thick line represents the velocity. Assfj3c;fje/d-t ume 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 t+ 5fj7c4(thvv,r tly dhe position vs. time graph shown. For what time(s) is thev 4fhtc+d , yt5v7jlr( 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 a* dg ,h;qse+6wz sfrx9n object given by the velocity vs. time graph shown, x*zw; rfs+gsdeq96 h. For which time(s) is the acceleration 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 acceleration vs. ti624 hmsiy sbw6me graph for a fixed time interval of an objectiw4m b6shys 62’s motion, what quantity has been determined for that object?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.08: An object moves along a horizontal line with inxzd-(bg /meqf)9 4atk creasing 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 twoaw6lt/th), ar 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 reaches the grounmgt.iq32p2mdi ma-hhcus, 79d 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 releas+g5im qv*y;a ned 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 qtoj aj a67k6m sf2z9ugd5 u0y,osy64of a particle moving along a horizontal axis is shown. What is the total distance traveled by u dqa56o m 2,a6yktf06ujyz4so9 js7gthe 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 coc,x+akh)7d g/j xd+n zr97hnjrrectly identifies all of the listed situations for which there is adj9kx7z+)h,j g h7cnn d rxa+/ 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 forlht2e 2ml;dzx69 wr1w 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 attain2tmh;l z9wlrd6ex 1w 2 a maximum displacement from its starting position?


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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.17: An object starts at the origin and its velocity along a line vs. t twq 0zwwe5j2b +11cmqime is graphed. Which one of the following choices best gives the proper in0wcz eqw+ q w11bjtm52terval(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 co;wjeo uhf7v 4)nstant acceleration. At an instant of time, the inforhj 7v4ou)wf;emation 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 positioghyt:vgl nk :4m m:-p5n $x$, as a function of time $t$, given as $x(t) = -15 - 25t + 10t^2$. Which one of the following choices represents the magnitude of the particle’s acceleration? All quantities are expressed in base SI units.

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.41: For the entire time shown in the graph, which one of th 7(xy; blruqy7a mj.2ce following choices correctly describes the relationshb7qj;.a2( rcmlxy y u7ip 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 descride ry6 t/jr67e1besb5t *tdx)bes the instants of time, atde7*t5rbtderje/by) 1 t6xs 6 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, each sgjqkf8u;kf vf*.p 2r2tart 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 k82rqpjffg;uv*2f. kes 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 graphqg:wailcrbs4z7)2y1 qr j6;x of an object moving on a horizontal line is shown. At what time(s) is the object movings7lay: w; x4zrqrb igq j)216c 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- yyd v65(gtsn8mnqp/ position vs. time graph provided. During ygnd ytv6 -p5(/8sqmnwhat time interval(s) does the mass have zero acceleration?


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