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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 spey0dmk-voroap b5hx;z.d *l ad1+*z(r ed 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 unit time w8px v i/;al 2n6wszkz;ithout reference to a particular dirzak/z;s2inw;lx 8v p6ection 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 circjk1qls kx w+y) tc)*+oti 13j;;ongxyular track at an average speed of 50 m/s and then completes a second lap ao1i+kt) ;*kcwy xx o)j1;lqtsgy +n3jt 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 in 1.0 saeo 8 j*a+vt3x at the constant velocity. If it continues, howvao3e+* atxj8 far will it travel in 3.0 s?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  05.34: A 40-kg boy is stationary on a 30-kg plabq(l (f3: 8ifl a4tlxeo-hbt/nk 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 relative ao/-fhxfb8(iltltl e:( q b4 3to 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 traveli- .8la bpof 6qr97cp9 ydnu+o+gac-1 g+bs zus 400 km at 80 km/h and 400 km at 100 km/h. What is the average s7+ld - zpbu1opoybqcg9+s-a ig 8+ra.96 nu fcpeed 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 t3i+x4h syqnv7 he motion of a toy car traveling along the x-axis+nih xq4y7 vs3. 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 the motion of a toy car traveling along the:e-ifg uj fprr2 uhgsb1,/ yyleh)03( x-axis. The graph shown below is a plot of the car’s velocity in the x direct-ei pughl3uhfr ) (s 2/jy1ef,b:0g ryion, $v_x$ 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 traveli m)nm5ne,3x amng along the x-axis. The g3 )nme5m nma,xraph shown below is a plot of 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 graph of the velocity vs. time of a duck fhz/ fzkev 8+c8rxm7o5lying due south for the winter. At what point did the duck stop its forwarkc or5+8 zem/8x7hz fvd 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 t,ty ppr ,+vn2bhe diagram below which shows the position and elapsed time of a car st,+r,2bppvn ytarting 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 sfilv4vaz3 j 3-hows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleration ia -lfz3v4vj3during 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 positx0v/nc *egyst1 e1 top5l:kx 2ion time graph shown y1c5xst/p*xlo:k0te1e n2 gv 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 quest7+et (7e1jfpettlg; cion refer to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits th(l +7tftg ;1teej pc7ee 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 information.h7 x3ac i.d-z,lkxf /a An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its originc d7iza .fx 3akl/x,h-al 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 sps ,bd::lq0r3 sac xe5leed 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 following scenario:d 3w:ng9y3zwb 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 refers6vak ab;; 9rcar* cr.og0ft*f 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.
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 r:phn szn8 ,(xdefers 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.
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 d oc rivm:/pyi/4)to6: 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 horizontal/;xyimc6r vymy/5 w f7z -i9io table top and off the table edge. Which of the following would best representoiiy / z9yy-/miwxr5c7v;6m f 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 represee : :,m+l*9cfun. bcuvz5evkants the relationship between distance and time for an object that is moving alve5mful, bk+*z.u nc9eav ::cong 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 distance 01:d*cjy7zh ewq9cv 8 ubd(ygand time for an object that is movinqwc c *b zyh :u7vd09dy1(egj8g along a straight line. Between what times did the object have a non-zero acceleration?


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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.07: A small object is thrown straight downward on Earth wit pa ,mvx6c e1;9bj8g(q dds)tdh an initial speed of 12.0 m/s fro( tv9 bdad sc);pd8ex,1mj 6gqm 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 represents a toy ca ep7.f5.;/hw* ya1kq7ijmzdxe1 ansf r starting from rest and uniformly accelerating across the flo.5ds7y pk jq1ea*1h.; f7mewn/zi faxor. The time and distance traveled from the start are shown in the diagram.
What was the average speed of the cart between 0.1 seconds and 0.3 seconds?


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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.12: The diagram below represents a toy car starting from rest;d0ub xjj5f 36vvlp /o and uniformly accelerating across the floor. The time and distance traveled from the start are shown in the diagra ;/lb06vu5dfvpjxoj3 m.
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 rest and uniforg s)r ju8ulx l sa4x/,;z/5xpbmly accelerating across the floor. The time and distance traveled from thxa l,4xpb8j5uzu/g r/xl s)s;e 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 position ofuwo7z o,g(5ox +gai)z the ball each second is indg oiuxo7)o,a5 g (zz+wicated.
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 baly pc5wim tt:rj 1;6)+mam; utll. The position of the ball each seco; pm;r6y t)ttjmi5:+ucl amw1nd 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 unicycle moving in a stjytj*+ z,)5iaa ;r mx)) wgyuzraight line is shown in the graph below. azjymyigu+5ta ,) *j)wxz) r;
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 movingsfc uak0(+j57:7nsdna kzo j9 in a straight line is showd nj0s:ns(a5f +c9z 77jkkoua n 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 the . 80wzbc+yupw 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 motj g*p9xf5) woawsu 8w,lxsd- 4ion of a marble on a table top for 10 seconds. For which time ixa,d* ps-w8gw) 9 ujs5fl4owx nterval(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 accompanyia+f(-yvry;:nobf3b + - hfjpa ng graph describes the motion of a marble on a table top for 10 seconds. For which time interval(bfp+vyo-r(bnjy a-+a ;fh 3:fs) 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 graph descrk:z90v:mx t ukibes the motion of a marble on a table top for 10 seconds. What is the marbles average acceleration between t = 3.3 s :kuz0tv :x m9kand 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 unifor(xzcqv0 ,4uf9vo1 rgbrg-5 tpmly 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 straig,/a;;izgfbpg 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 fol)+obj4amb 2* ge1qzb9x g.yn:r ihw0fp9ybv0lowing graphs could correctly represent the motion of an object moving withabv:h.0zfn 0bgp)+*y94 q 29oybb x rejiwg1m 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 descrsk d46th9:m8yb e3mr uibes the motion of a toy car across the floor for 4 eh u:3b69kmmdtrsy 810 seconds. What 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 describes the motion of a toy car across thxy)n8h) u2rq k*j( dnpe floor for 10 seconds. What was the total displacement of thedqrk2 uxj)nhp(*n y8) 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 toy car acrm af x)m9u)2avoss the floor for 10 seconds. At what times or time interval fvumam)x)a92s 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 uni/e gv1/z)i;fu bozo9 jformly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best represents the acceleration of the/ g vzb;iz1/f)ueo9oj 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 vvi9 .33zmbkmg-bejm ) elocity versus time curve shown. Which of the following statements regarding it)3-zb mve ki39mm bg.js 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 time cmc ipg*29.7 m5aj fzzaurve shown to the right. When does the car have zero accelerat2 *jm9z75agf mazc .ipion?


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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 thes;u 1 (nbhstsoe+7 fep-:tu /v angle between the velocity and the acceleration of the ball is kept ase+h uf71vtbs:pts - ;un(o/e t a constant 120 degree. Which statement 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 kilometers apart and traveling toward zg:+w 0r h3fd(gea + *qyzzti*each other.ge* q fzdz+0a+ hzt:(gwr3yi*
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 accw1:ro-tsgexn.t izo 2* w28nw 9 s0pfqeleration is positive and increasif str-i z:w .1wo9gq2pt e8 nwns20xo*ng

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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 velo3ypd.,axz6( qet9jb bcity is

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.18: For any motion in two dimensions, which one of the folloy+: j5qvk is0t5z-(ty.l o ikqwing choices identifies quantities:(i-5 yvs 5jqylq0 kti.ztok+ 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 move1o 5ny7)g v d;r-kolvss $3.0\;m$ 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, e(ex.n m 8k6nf$y\;vs\;t$, 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 toty(5, xgpocvc k1b8b3 utde58xq0 o0otal time T in two pax 183kb,xeg5cu 0yovqcb t op8d(o50trts.
• 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 strai:q0oba2; .i ,n7 fouvy e5seyiw bez:(ght track is shown in the diagram. The thick lu0oazv:iq:.e e bws2be7 5 yiy,o;(fnine 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 i51,gj(mlypbxll o-jv+ .f 4qk*ctop6)ut(hy s shown in the diagram. The thick line represents the velocity. Assume that the car starts at origmlgu( 5ty,)ob6kpyxv l t(ohc+* l-p4 1qfj j.in $x=0$. 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 ofl 0.db onf84 y0qbcp4z an object given by the position vs. time graph shown. For what time(s) is the speed of the object grea0. yncb0qp8o4d bz fl4test?


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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 velox9;:jai:x x6 e. l 1dqadr5hzucity vs. time graph shown. For which time(s) i 6;:rixh adjxxq59z1ua. :dles 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 v .mj9;l3k.xonzxv 9jxs. time graph for a fixed time interval of an object’s mj xx 9lm.kxn.v;oz93 jotion, 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 increasingqg *9ve x.mmp4 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 two d,bwgs(n v jxtc7/ojl57g v 07parts:
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 groi53b ka4y*b/t n/maqfund 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 rs4lebv./ -w*cgbcqod y-.e; 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 of a partic2+ptslq)v;k;q c(vex le moving along a horizontal axis is shown. What is the total distance traveled by the particle from t=0);qv2lq(;v kptsec +x 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 ihq*j*-5vk p zl 00fzfxdentifies all of the listed situati0hj vqk l**z-5xz0fpfons for which 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 v9- nr)vi /d)y m:f77avc a*v+ix4hkipi7y as ys. time graph for an object moving along a line is shown. The object starts from rest at time t=- 9y/77 )ikmaivfv7ca yisrxd4* n i+ap:h )vy0 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 starts at the origin ankc7 nmdpkpx74 h ;(w2ybb( qj+d its velocity along a line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of time foknmy7kcq2( h;+d (4jp p b7xwbr 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 i8i-s4iz+rll track, each with constant accel ril-48i+l izseration. 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 positiono -j*x*5e stle f j9a8n,skv 5:iu mnhku-8wn) $x$, as a function of time $t$, given as $x(t) = -15 - 25t + 10t^2$. Which one of the following choices represents the magnitude of the particle’s acceleration? All quantities are expressed in base SI units.

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.41: For the entire time shown in the graph, which one of the flq 1t 92q1mnoyf s(,acollowing choices correc c1yfs(qa 9qo1nl2m t,tly describes the relationship between the average speed of the truck to that of the car?


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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.42: Which one of the following choices best describes the instapximl:i. 8a w+mj,w 3hnts of time, at which thejw+p 3i8.a:h,wix lmm 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/zgkzwnzcwi9((n/-lx;widrc x 7f/gql )9r+ origin and will move along the wi+ixz9lf/lx qkrrn/c zzww/7- )(gc9n ;gd( x-axis. The 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 o,r wv(7 fzsgx;n a horizontal line is shown. At what time(s) is the object moving with its greatest speed? sx7w (r,g ;vzf


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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 +g j)f0 v8rcp.bei gz0b/vo wisp e,/0the x-axis following the position vs. time graph provided. During what time interval(s) does the mass have zero accel,00e+ /o8i cfzep)gi0vrb/w bvjgsp.eration?


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