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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 a constant speed around a cih4uj vuz;ktop+fy 2 nt/ j9y- /ca-,(zpr0zvvrcular 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 q6h l:nbc x86zcja u3 t98c)swper unit time without reference to a particular direction is cals8q8 n9 w b 6:3u)cjzc6txhcalled

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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 armbh;3v fg:0 xkound a circular track at an average speed of 50 m/s and then completes a second lap at an averagevb0h;:fk mxg 3 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 in 1.0 s at the constant velocity. If it contin6y* dbsa/1u zrues, how far will it travel in rb/saz1u *d6y 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 stationc+4 )lwhxm x0yary on a 30-kg plank that is sliding at 5.00 m/s to the right across a frictionless pond. The boy then turns and starts walking on the plank at a rate of 4.00 m/s to the left, relative to the plank. What is the speed of the plank relatil c x4+yx)h0mwve 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 trai.q *cstcg56 ovels 400 km at 80 km/h and 400 km at 100 km/h. What is the averagesc *o6ct iq5g. 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 travelinzenrb/ 17of tog:9 colno08l ,h i4p1qg along the x-axis.7 tcbogl f8,hl noio1/z9o 0p r:1qe4n The graph shown below is 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 h)72w8zmq wdxs7h h8kthe motion of a toy car traveling along the x-axis. The graph shown below is a 8hqzhwh)2w7sxm k87d 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 trgtw,.stijbzs(c tr7r i2;)u ,aveling along the x-axis. The graph shown below is a plot oftrribj,s7tci. gu2 ,( st)wz; the 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 graph8*h(r tjve gk*7pdp,d of the velocity vs. time of a duck flying due south for the winter. At what point did the duck stop its forward mot7 ekpjthdp(*r v,d* g8ion?





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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 towt)/- pc.4m gizfk+c q the diagram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the averai./fcw g tckz-qp4 m+)ge 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 diagslf4ss ,co dxjl,3ikq l n;r2./:+iqdram below which shows the position and elapsed time of a car starting fr d,xlins il /s2;4fclr+ 3,jqq:o kd.som rest and uniformly accelerating in a straight line. The average acceleration during the entire 3 second interval is closest to


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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.20: What is the shape of the s(kl-)szy,duf/a h1rp y 43c 2ylidz2velocity time graph for an object with the position tiiz1s( k 2fzl2shlc4 d/ay,-d)rypuy3 me 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 referuhasrk475g88h va(um to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor ana8k8h uvm 4uagsr7 h5(d 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 folloqv3c5o*m00o ;tw a ld2ift* rhwing information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the 0o*li* mrt dfc3ha;q w5vot02floor 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 +3 w1 eg. lkb0ow1fvsl4f7lv xspeed 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 refer45.5jtr +vb qze( zii cqhv3u9s 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 the followingjt o . i5vdf(c,w6.vju 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 folqbvjdd i9+ /+ylowing 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 fol sy 8yl4)tbb(rlowing 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 ra/z 0i8gj+gwj 2evu1ik mp, across a horizontal table top and off the table edge. Which of the following would best represent a graph of the magnitude of the ball'2iw/z vj 0k8g+ie 1jugs 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 relationsh c;c qmzqw-sf3hi(z,;jtd0p2ip between distance and time for an object that is moving along a straight line. z 3z 0-pjdmqtfh sw,cc2 (q;;iWhat 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 repre,a22cdl egmo; 4gcss-e /gj2 fsents the relationship between distance and time for an object that is moving along a straight line. Between what times did the object have a non-zero a a-2desgo2cl / fg,gemj ;42sccceleration?


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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 i .reja6*:kd bns thrown straight downward on Earth with an initial speed of 12.0 m/s b ke :aj*.rdn6from a position 10.0 m above 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 represe6k0it o kx1w-knts a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start are1- xi6okt0 kwk 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 s c a,m4revyqvfkz xy7.t722n: tarting from rest and uniformly accelerating across the floor. The time and distance tvm:z cv qaryfyx,2 nk727.t4 eraveled 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 rei42g)ztnf-yi /s 2plv st and uniformly accelerating across the floor. Ti)zv f-2i lsgt4yp/n2he 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. The potj. fchf;qk t9j u,60pub6xd-sition of the ball each seco tqtc,;b 96ffdh. -x6pjkj u0und is 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 acceleratinw us*+/1hb nbyg ball. The position of the ball each second is indicatedhubyw +*1/ns b.
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 usxm yiwk5pd2ayk( ,36 nicycle moving in a straight line is shown in the graph below.i2 (6mp y 35ax,kywksd
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 circu)hc 9 jbk a ijbfx5uz+v4g+84qs clown on a unicycle moving in a straight line is shown in the graph belowja ki+v48b 9j)zx 5fg+u 4hqbc.
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 surfacrhz ,p5nmqv8 5e 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 mo-gnyl:nhv ;l mv2s4 1wtion of a marble on a table top for 10 seconds. For which time intenlvy1 gv42h- ws ml;n:rval(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 tey+2wo q6c tbz3 b2d8mi8:qe uable top for 10 seconds. For which time interval(s) cmu2boitq 2zb:8qe8d6 w +ey3did 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 5kxomj 4os;r (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.oo j4k rsmx(;58 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 rest for a 5qe a)b *euz2ktji42ctime 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 downwcth /vbyk14t98 pz+ ydard 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 90 g(x bg65ul+0o txchec zu;arepresent the motion of an obuo+eg lzgu5;chcx x( 0abt069 ject 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 deopo .fmh2 x tl +1xu2imy2z)j-scribes the motion of a toy car across the floor for 10 seconds. What is the acceleration of the-jz of i2x m2hxom tpu+1.yl)2 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 describe2w3b+gsl ueoslwt /*(s* ;jwrs the motion of a toy car across the floor for 10 sec/o*ts( 2 3+wgwl s b*;rjsuwelonds. 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 toy84yvifmgd zfkuh b /hqs9*/.4 car across the floor for 10 seconds. At what times or tigvh.9s/4ukh4dyz i 8 fqm/b*f me 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/hrh/1uqx)vp7 x, oo8 3d/f.jyh yeup(jg to 60 km/hr in 4.50 s. Which one of the folh qfuoup8.x 7oyjh)v/e,1 p(j3/ ygxdlowing choices 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 time curve shown. Whichi j oijl41f0cs1r ;8k ap;3maz,h9aa m of the following statemenc0a8 l apikji1z1j4h 3fmr , ;sa9;oamts 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-axis according to the velocity versus tgsf)llpzv 2 4(ime curve shown2fg4ls zl)v p( 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 interval of time, a tennis ball is moved so that the ang/sozn .0c n)i-tcdrx)y b )nypj us+)-le between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true about the tenu +)dns- ixy/.ty)) snj- r0ozp)bccnnis ball during this interval of time?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.03: Two automobiles are 150 kilometers apart and traveling toward each ore6tp 7su::qjther.u qe6sj7t: :pr
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 monz z-8-ppjoiij- ta)8ves on the x-axis. When the acceleration is positive and incr zz n--aj)t o8i8-jippeasing

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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 averafnu+stl + /b*u78ziz-. vs 9+ugymeb3jni-vmge 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, zyv75j2 m6 tbh. h-qddwhich one of the following choices identifies quantities thb-5qj72z mt6yvdhd. hat 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 mov i3pis 708hck n8heyc0es $3.0\;m$ 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,3g4 gecp(( 6 mflodc1c $y\;vs\;t$, 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 rig pnnle8) vg;3/aakuh ndu1:-f r/h7njht along a one-dimensional track for total time T in two pfe a 1r3k8ujndn/:v/hag;lu )pn 7n -harts.
• 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 st 25pqd0rlnhlc+v7n n8raight track is shown in tn7 nv8h0cll2d+5npr q he 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 agf xufzq* m:vp6/p+ 1t car on a straight track is shown in the diagram. The mu x/g:16z tf+p*f qvpthick line represents the velocity. 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 motion of an object givld1t9ncsj;6ra8 jf-au x) hodt4-e+ien by the position vs. time graph shown. For what timlxdrj;fajs986)-dt+oau h 4- tin1 ec e(s) 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 velocity vs. ti h/wfor(s+tj2me graph shown. Forjswht/+ (2r of 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:rmq9,lh .ozj vs. time graph for a fixed time interval of an object’s motion, what quantity has been :l9 z.mj,oqhr 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 hor+kwk q ;cmoclxasd ra*j *x4 qr(4(0nc-/x+nyizontal 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 /c wji *ow5di7d3d s;9zc cvjzz7 m);wtwo 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 groun a-ct* *-epkpn70lsj ( mznk)hd 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 ground5mevajj-3-jz nl 2an 2 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 grapzoqkb o , +gzp/;*5l; ne)hclph of a particle moving along a horizontal axis is shown. What ipcenp;l o,zzb + l5;h go*)k/qs the total 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 correccwj ckpv)d3.bg .w.o1x6u* aptly identifies all of the listed situations for which there is a non-zero acceleration?) k. 1dg6 jxupwwac3o*..pbcv
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(c/yf ku owe vvk l-tb06)6*gm moving along a line is shown. The object starts from rest at time t=0 s. At what time(s) dowb0vo6lc*6() um/gyktfkv -ees the object attain a maximum displacement from its starting position?


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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.17: An object starts at the origin and its velocityrd 16xf :wmm)dx8xt.(ouy8f c along a line vs. time is graphed. Which one of the8omxu. c f:dwr6 1xdtx(fy )m8 following choices best gives the proper interval(s) of time for which the object is moving away from the origin?


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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.09: Two cars are moving to the right on a horizontal track, each with coxk r u.aj9bw*d73) :t;yilne.ytx- sgnstant acceleration. At an -y.g ld 9y;n3rjxa wtbise.kt*:x7u)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 positionsc 8yzrpy9b 2/se8s y, $x$, 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, 0,szb ybmy+ 0evd1 (mj+ ih,vowhich one of the following choices correctly describes the relationship between the ab ovh+e01m,jz0s y m,y (bidv+verage 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 choicec k03e:)oizgqg ,a x1es best describes the instants of time, at which the car and truck travel with the same1ge,c i:kgz o0e)ax3q 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 d/m;muh i6m,dQ, each start from rest at the origin and will move along the x-axis. The acceleration vs. time graph for each car is showm /md6d,u ihm;n. 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 v61*ks vko:zd horizontal line is shown. At what time(s) z k6ods1vk :v*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 po, v c+i,76pt: nwhwksbj w:w6lsition vs. time graph provided. During what time interval(s) does the mass have zero acceleration?sjhww lw :ncb ,w6i,t+p:6vk7


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