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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 an twa2jdr7 z9 sji;.2j 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 unf3tp77w ,a9g/7elvcp d 1ycccit time without reference to a particular direction p39dyl,acv ec /g fc71pc7tw 7is 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 im i)1orwkb0l:::5 z pio c,dd;,uti uan average speed of 50 m/s and then completes a second lap at an average speed ozr u5ou,cd;dw i:b:k1i:i pi0)m , tlof $V$. 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. Ig a i-pa+wnuy5gn9ffin2g9* 1f it continues, how far will it travel pg n*g-iaw1+f ayginn2599fu 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 stationary on a 30-kg plank thma0 zfqsy(y8dr:j/:p at is sliding at 5.00 m/s to the right across a frictionles( md 8rfyzjys0/ aq::ps 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 travelshtez u3z w8qe(qthv1fv x(+ ,q4ug+y3 400 km at 80 km/h and 400 km at 100 km/h. What is the avf(hev41 3wv3 qt,e(zhxz+ u8ytug+ qqerage speed of the motorist on this trip?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.20: This question refers to the motion of a toy car trav81rys /im4ioij; pzu0 eling along the x-axis. The graph shown below is a plot of the car’s 4;1ro yzip0 / mu8isjivelocity 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 tr w87l 2zxmlvc:-jvi v(aveling along the x-axis. The graph shown below is mzc7-8xl2: ljv (ivw va 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 8b mh:z 9ij-dbf*wjl h8pka9 1traveling along the x-axis. The graph shown below is a plot of the car’s velocitdjhj-mifk9 z1bp8la*: 8h9w by 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/b 5p7/y jozoi due south for the winter. At what poi5/bi oyz7j/ opnt 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*-ziy02wehtyyl l wy9m ph5.( position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the average velocity of thywyyy-0lz lph9 *mwe.ti (2h5e 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 pbs c ,)q*z0l93 wejekvzhju: sw,+r8uosition and elapsed time of a car starting from rest and uniformly accelerating i,c8uj bsz+lv0we3rejkq:zh , w)u s9 *n 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 veloij/ogug(b* b tb- .m*chf5*gacity time graph for an object with the position tima(*-g b.io/uftgghb5j* b m*c e 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 following information. q1 02bbz2afqyxm8m+b. arj9cf4vqb 5An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the flooa89.maryzq2fbx +mcv1b 2 0 fb54bqjqr 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 re3a)xwoz2z z muvl8), ga p6yp*3g/igffer to the following information. An ideal elastvau*zzzl82fgo/ mg)yp3) gpwx 3i,6 aic rubber 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 with a+d7dln rr 4q- e3jfxvj9y wn*6 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 ni 1zhc+mvx1xtw r7 9* y;-di+ppx uj.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.
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 nvey. i6z i;f-the following scenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
About what position after $t_0$ would car #1 and car #2 have been side by side?


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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.03: The question refers to the followinn3 g9ye au ldqh)6l+)rg 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: At f4t/48xs,hp fk jsqa)/p0 gpu9 gl*zp $t_0$, 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 nr 49qqxbo9v 9o,yi0hv;) vw lramp, across a horizontal table top and off the table edge. Which of the following would best represent a graph of the 4 qh ,vyvoivl;oq99wrx)9 0n bmagnitude 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 be4ph *z-iykv, 3u(ff9w7wwy fatween distance and time for an objeczwh 4vf3*-fapfy 9u iy,w 7wk(t that 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 relationship between dismouuj9i 5x )-qtance and time for an object that is moving along a straight line. Be)uq9m i xoj-u5tween 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 initial speev kw p 8i4*1fyb* vxr ufilnr-6y(4d7ld of 12.0 m/s from a position 10.0 m above the gro* ldlyfuwbv4kfi61- p*478nxrviy(r und. 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 bel +f 73 :veg/roqkxgpi/ k69ujwow represents a toy car starting from rest and uniformly accelerating across the rigqw3 /kpo/ v6+u97kx jg:f efloor. 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 r32o jqm2c hp zut1tpl2ho08gn:n s-3iest and uniformly accelerating across the floor. The time and distance traveled from the start are shown in the diagraghtumzpo222 sc-onjtp8h 3:1 lqi3n 0m.
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 cauvcvb+ ; eyb0krgncay +,6i 6-r starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown i gyviyb rk+6a0c6-+;cnev, u bn 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 uni/ pp l nu-4lnrd,ny,s;formly accelerating ball. The position of the ball each second is indicated. y n, d;pnl4pusr ,nl/-
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 ba, rde6zeqz npt+b uf(:i. hn3gaap ;37ll each second is indicated.np nbpzare7eqtzu( 3hg ad;,f +.:3 6i
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 5 dnqz-lvg 5t4+dvsea6sg/4krcus clown on a unicycle moving in a straight line is shown in th/ k64l naev4zdsgst5q d-v 5+ge 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/.f ( sqjfkz*g moving in a straight line is shown(jfqz *f /.gks in the graph below.
After 12 seconds, how far is the clown from her original starting point?


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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.04: When an object falls freely in a vacuum near thxm3zd4.o uq5( 7rslgsd0+ hik kzw)0 te surface of the earth

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.11: The accompanying graph describes the motion of a marble olq, tf mh*-d6:73dfq ios0b1 s tn.oaqn a table top for 10 seconds. For which time interval(s) did the marblea:-i*md .b fs qt,dosq16qnh07of3t l 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 accompanyin6ii 5op:a q honz952wzg graph describes the motion of a marble on a table top for 10 secowi2io az:5 96hnqp5zonds. 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 accompanying d tikjgs1.- a8 p9d.ona 1/kzxgraph describes the motion of a marble on a table top for gjztxp 1s -./do9d8naa.k1ik 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 uniy )rdi+:tb3qk u6p9 6*rj pvpoformly 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 strae 8r )(xjke(gf+d52b4ewn ukzight 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 coul3cj ) l0uejb7jd correctly represent the motion of an object movju30 blec)jj7 ing 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 grah3men r wt8(h9ph describes the motion of a toy car across the floor for 10 seconds. Wnwte8h 9( m3rhhat 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 graph describds jont5h1:wpb oq* -;es the motion of a toy car across the floor for 10 seconds. What was the total displacement of the toy carh *qdboow1p5j-n s:t; 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 theuarjhb5 .aplc*7b21s motion of a toy car across the floor for 10 seconds. At what times or time intervals must the net force on the toy c.2715 h*uap bblsajrcar 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 jx+qsma x7.)ckm/hr to 60 km/hr in 4.50 s. Which one of the following choices xs )am +xj7q.cbest 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 time curve8azgz/x) ql3o(ux e 6z shown. Which of the following statements regarding its motion is g)z3 86uz q/eoxlza(x 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 al (o7zxhl6w8xx/m6ip1 kc dt )aong the x-axis according to the velocity versus time cura1t6zk8c xdml/i x()pxow76 h ve shown to the right. When does the car have zero acceleration?


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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.22: During an inte1pqpsn )/q q9irval of time, a tennis 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 intervalp pqsq)/ 1qin9 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 + i,jir d9wiph/t)a+0j iy,up68ohgj and traveling toward each other.+ip+jiwpy9rjojt u) 8/dg6h,h0i i a,
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 isg u)c h4h7n0op positive and incre0h7 4 oph)cungasing

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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 oc:qj +ulid.ac2a( n9 1(aeft txwj2*tf average velocity is

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.18: For any motion in two dimensions0: d g5mw s9;s.pncbhk, which one of the following choices identifies quantities that must have t m w0h9d:pcskgb 5;sn.he 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 mov 8 g,;vk;kviud czd0d6es $3.0\;m$ 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-timvqb28lzce x-p (sf7 0ye, $y\;vs\;t$, 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,*u g5m0hvrss8y0qln time T in*, rsl0 mgs uy085vhqn two parts.
• Part One: The car maintains constant non-zero speed V for the first $\frac{3}{4}$ of the total time.
• Part Two: The car accelerates uniformly to rest during the last $\frac{1}{4}$ of the total time.
What is the ratio of the distance traveled during Part One of the trip to the distance traveled during Part Two of the trip?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.23: The velocity vs. time graph for the motion of a car d pm45ovjx,6z nmk7(bdr+j)j qu c*l5on a straight track is shown jvrd kj m4zu, l* (qxmcnj 5+6p5o)bd7in the diagram. The 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 the motion of a car on a straight track,)rxh8ud-ef r is shown in the diagram. The thick line represents the v)eu-dfx8r hr, elocity. Assume 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 mottc:7r;x l*d0uagtl i9 ion of an object given by the position vs. time graph shown. For what time(s) xa*09cr:llit7tg; ud is the speed of the object greatest?


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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.11: Consider the motion of an object given by the velociti v1 znv 2j;;hhvy:59pybenh4/ f kl(ty vs. time graph shown. For whic54h yhfnk:y(v ;hvb 1ilnztp/;j ev92h 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 acceleratsu794 tmk:5y gt a7isdion vs. time graph for a fixed time interval of an object’s motion, what quantity has been determined :t 9ys7dtmsa57u i kg4for 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 horizood44b:7bdr ,nf mal0fntal 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 tr 8dfluvy2f3k6ztcy25j x aj ,)ip in 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 rzdh7q, y9 :ncr:bu(sleleased from rest and reaches the ground in a time of $2.50\;s$. Neglect air resistance. With what speed does the object reach the ground?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.03:A small object is released from rest and reaches the gr-rcvfc3:s6 unsbqd8d jnpdume):( *, o(*xauound 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 part+wh.1ul. bx jjicle moving along a horizontal axis is shown. What is the total ju1w+ .xjlb. hdistance 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 identifies all of the l /oou.a2ohyf0isted situations for which there is a non-zero accelera0y/ f.oo 2uhaotion?
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 fn6:gmr n0yiy( s9y4t 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 st(s y 0 f:49ignm6yntyrarting 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 h/qwew8p 8 lht l1z46x+8he hoits velocity along a line vs. time is graphed. Which one of the following choices best gives th1ohl6lhexhw8hz/4 8 8 pewq +te 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 s1izm 33bsmf/9 m;ctm constant acceleration. At an instant of time, the information33b/9m zct 1 issmmmf; 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 haudi( hvogr-r1n(/j (em+fb m7 s a position $x$, as a function of time $t$, given as $x(t) = -15 - 25t + 10t^2$. Which one of the following choices represents the magnitude of the particle’s acceleration? All quantities are expressed in base SI units.

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.41: For the entire time shown in theb0 sujgnvfb/0*7(rk.agpz ,t graph, which one of the following choices correctly describes the relationship between the average speed of the truck to that of the cabp(zka /f s0jbn ,*gv07tu r.gr?


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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 ofj44xr x8 2vel)m z yw5ff5yio, time, at which the car and tyxyzfm)x8wl2 ej4v54r5i ,foruck 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 originvic*o bh* l +h;zt;32u;tvd7c vlq/nd and will move along the x-axis. Thzdu3;c7*n+vvhq; l ; 2*vd/lt bh tcoie acceleration vs. time graph for each car is shown. Which 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. time graph of an object moving on a horizontal lotb(nstf4wc8kg.s 4z:hzm9vcv :+xt :es h6 (ine is shown. Att sts4c cf89hgz.wz(vs::o4n+6hbk ev: m(x t what time(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 grap41-/2m nfi gvkg zspa)h provided. During what time interval(s 42g a/fgin)kmpv-z1s) does the mass have zero acceleration?


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