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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 cons;zx4lufnk4 7fa r7ou.w,wm7f tant speed around a circular path of radius $R$, if the particle makes one complete trip around the entire circle, what is the magnitude of the displacement for this trip?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.01: The change of distaa1;m9 xr 1cprlpup0;ynce per unit time without reference to a particular directily1;0rx;urmcpa 91ppon 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 compma+w tvbuz ;0/ sjs2 g-rt)7fuletes one lap around a circular track at an average speed of 50 m/s and -tfa7) u zv/+jrbu;tgsm w20sthen 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 0.80tkpw*x v6:u. o9u2 t lgh/d,ykqh57m f m in 1.0 s at the constant velocity. If it continues, how far will it travel in 3.0 s?7x9 fw 6umkh hl:5* .2 tok,ty/qgpduv

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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 plaxv* 7 r)k e;v5u4ssc(tjcow8h 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 v45t 7xj; ssov)8(c hkw r*ceu4.00 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/hc (* ortu r(/and51j*3eg mujt. What is the average sped(aujtm /n 1* j5r3ec (toug*red 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 9 8 :ca(andoxzn hu,0e:t,xt7+ywkoetraveling along the x-axis. The graph shcwhnyk d9 n:,,:ax7 z80(ua tteoo+x eown 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 t)qmm hh f; 9xbgb/7nf*he x-axis. The graph showngm/ *h7b;mbf9fq nh )x below is a plot of the car’s velocity in the x direction, $v_x$ versus time $t$.What was the acceleration at 33 s?


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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.22: This question refers to vzla1g1c 57bll(0n. t afb7sothe motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the x direcn5at b7 bfsa101gl v. lclzo(7tion, $v_x$ 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 dyo j9,is egixa.):pi .ue south for the winter. At whaps ,gie: .i9 y.)ojxiat point did the duck stop its forward motion?





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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.17: This question refer to the diagram below which shows the posu-7)g0 7 a ef8idqqlyjbf3j7a ition and elapsed tqj3if 8qf 7 gjd7 u-y0e)7blaaime 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 whii,vh( dh+gyf, rl 7r-jch shows the position and elapsed time of a car starting from rest and uniformly accelerating in a strai r-r,(,7lj yifhvg+dh ght 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 velocity time di:e 9mxx37 gegraph for an object with the position time graph shown in the dmi9xg ex37e:d iagram 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 follozu 20+w.nwi zdwing information. An ideal elastic rubber ball is dropped from a height of about 2 meters, udwzz 0 .wni2+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 9nj2yf2vhp1zsvtz bz9;y3y 56n8yg kfollowing information. An ideal elastic rubnyybf2z9 2j 8y1 vn yp6zk;35t vg9hszber 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 spl gev,3 b,r.pigb. j4xeed 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 53e - se0utristhe 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 following :rvei -je1x; hscenario: 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 followingame5i1 rarm11o6sn2 g 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 folosk sy /r 8p650iug l,fq2gcy,lowing 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 ramdolbr4r9 /vunm4 ;v *zp, across a horizontal table top and off the table edge. Which of the following would best represent ru9 4 ovn/dlvr*;zb4 ma 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 represen 1jbscukux x k6u+n)2*ts the relationship between distance and time for an object that is moving along a straight li6s uuk 2+kxnjbx*u c1)ne. 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 and / *55b, /djl.uzgpu tsuovc 5wtime for an object that is moving along a straight li sdvupo/5b/t l,uc j5*gu z.w5ne. 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 with an initial bqx(i33w+);)fhlyop/ z s xzy speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resistance, the speed of the l33fx) syb+ ;q i)yozpzh(w/xobject 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 car stah*e9ptz y3 yv2rting from rest and uniformly acce9tyyp2 *hv3z elerating across the floor. 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 and un;ey)(jgqbzm mol n962 iformly acceleratin6(o9j2;zmmqegy) bl ng across the floor. The time and distance 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 f-ebk j2;k4vuc/ xvslw.m3j20t q p.l prom rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown in t.lpus t-;wl/bkv 2qjv.em23k p0 cj4xhe 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 positionbg5a9 z. pod05skrpf7 of the ball each second is indicated. bp9r0z 7 k5pogasf5.d
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 ucwzlk0q-:4pel ;q 2ns 2ry;ix niformly accelerating ball. The position of the ball each second is : q; -lens4cipz2lr2y;k qxw 0indicated.
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 undekgnb*vtz izqjfd g+,;: 9cky t7 440icycle moving in a straight line is shown in the graph4tvd * 7z0bgyj:i+cn9;4 dkf,qzt kge 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 unicyc7 6-ozz-yu:kjo8ufq+cd t3iqle moving in a straight line is shown in the graph below. 6-o cu8ufqj+tz yi dok:q7z-3
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 fpj;s s dof,,0r ti3t+zreely 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 of a marb x2dd91hmea;a le on a table top for 10 seconds. For which time m1d ae9hx;a2d interval(s) did the marble have a negative velocity?


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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.12: The accompanying graph describes the motion of a marble on a table 4c ffz:e8b li+zx)e,m top for 10 seconds. For which time interval(s) did the marble have a positive acceleratf bl z),+:eixmz4f8ceion?


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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.13: The accompanying graph describes the motion of a marble on a table to g:kywf9w 9d7j /oxwt-1bgzk )p for 10 seconds. What is the marbles average acceleration between t = 3.3 s o wg97 wfwz 9)/xdtky-:1jbkg and t = 3.8 s


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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.20: A car accelerates uniformly from rest adki vomd:9hi(n r1 /.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 st gm )m-)4nvhnonp2it( raight 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 represent ti+rusxp0m9 onx ;uz9bk43y/uhe motion of an object moving with a constant speed34up99ux nyr/kmbz 0u;+x si o 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 carpocq3 u3 6nj,b across the floor fou,qpob c nj363r 10 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 ma vti 3.2otcu5otion of a toy car across the floor for 10 seconds. What was the total displacement of the toy 2t o3ativ. 5cucar 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 motcwzgs6fuku+5 h6 w/ a;cq59 jfion of a toy car across the floor for 10 seconds. At what times or time intervals must the net force on the toy car be zerfc 6 5c/+ a5 khg9sfwuuq;jw6zo?


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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 frou.jkm +k ,km,d x1ew1dm 0 km/hr to 60 km/hr in 4.50 s. Which one of the fodm1,k . e mj+1kukd,wxllowing 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. Which of thee(yqn,8 7p i3s(z5tu bggo;au following statements regarding its motion is Ntuy e 38(osn5bup g(iqa gz,;7OT 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 a6yqp;xv5 h s uquh/b3g b/u2z.ccording to the velocity versus time curve shown to the rightb;6.q qu/vgyzbhh 25s/x up3u. 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 intervaleumyr 9g/2h.( w t:krp 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. Whic krghy:(we. /p9 rmtu2h 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 kilr8)+td 5e im 9tmjqum1ometers apart and traveling toward each other.1e +dimt9t 5rm)mu8q j
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 accele (g vp*xw1ta6m8e9 pzvyf))5stvp y-6whd0buration is positive and increasinf esp6tdwzw vmyp6y (p9uga8 5x)hbt)1v*v0- g

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.12: The definition of average velocity +5 .lz*rapw vcl6k6jx s;jlh30 rmi*v 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 dimensiowkt84 x+tusl74c goa hg:bb-uz:s4h+ ns, which one of the following choices identifies quantities that must have the same directioatsx4s zbu+oh:4u 7l- 8:gwckht+b 4gn?

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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 g u5d/fciq5 k)puy7s(es $3.0\;m$ 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-tiqdxk77jcnjry1( 1 p;n me, $y\;vs\;t$, 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/60vh t ihlb0bnzn 5sl, n(da- T in two parts. -v 6( ,/llzn05hb0th absindn
• 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 th3a1s96tkt dzx e motion of a car on a straight track is shown in the diagxz6k93sta1dt ram. 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 +-+ hy2rjynbn straight track is shown in the diagram. The thick line represents the velocity. As2 yj-nhnrb++y sume 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 obje:b/:n yqg- pwvct given by the position vs. time graph shown. For what time(s) is the v/p gy::-bqnw 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 mja9z,i(pu j24+g z:aqo* wokqotion of an object given by the velocity vs. time graph shown. For which timo2: 4azgj+i9zjoapk*,wu (qqe(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 j: 87siuuq towcdj v: 9xj.83aacceleration vs. time graph for a fixed time interval of an xt jji9j3 uc:u. w:8d7v8s qaoobject’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 incrav 2pzfp3+ ,zseasing 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 02n.xp xo aq-iin two parts:
Part 1: it travels a distance of 800 m at a constant speed of 4.0 m/s.
Part 2: it travels a distance of 1200 m at a constant speed of 20.0 m/s.
What is the average speed of the car for the entire two-part trip?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.02:A small object is released from rest and reaches the ground in fswg *1en9ks; 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 releasede:-yh wxb1ur* 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 of a particle movings6s:3+omjggs sn-)g-wui xn- along a horizontal axis is shown. What is the totans-s -im 3gsxu n:sgwog+j-)6l 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 correctly identifies al:6)v3g;yxn fw+ azr rk +nsba.l of the listed sit s63;b)vgwnnz+ rxa.fayr: +kuations 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 v 0s2kn i/qimqbk;;:ibs. time graph for an object moving along a line is shown. The object stan b;0b iq s;q/ikmk:i2rts from rest at time t=0 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 and its velocity awe s)qazwv6x-bo m,a j+lth sgce) 45.t23* splong a line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of time 3xtv.w tgo spqam +bjs6, -a2sc5hz*l))ew4e 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 horihte; +qu*yay: znj; v3z g:gd*zontal track, each with constant acceler:y3*jv hn ydga*gz eu:tz;+;q ation. 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 positu5/* pwfkr, htion $x$, 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 o1 j:bv;utv6t r(ce6u 8sa e j),p/akcsne of the following choices correctly describes the relationship between the average speed of the truck to that of tv)e,; uc1(s :tb/6rkpaa6 ev st8jcuj he 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 instanz q.-oaqt4d/-yb if+ots of time, at which the car and truck travel with the same spy o4oazq/qd-b tif. -+eed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.30: Two cars P and Q, each start from rest at the origin alpkl/n6b0 d -xnd will move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the following choices correctly identifies the relationship fodkx -n60lpb l/r 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 li5 a+i8c npsb-one is shown. At what tn5csai +-pob 8ime(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 al w26hh6fl;nuod 31e xuong the x-axis following the position vs. time graph provided. During what time interval(s) does the mass have zero accele1uehwhf6; uln6x 3o2dration?


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