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习题练习:Physics Bowl by Topic 2: Kinematics - part I General Motion

 作者: admin   总分: 72分  得分: _____________

答题人: 游客未登录  开始时间: 24年03月31日 09:50  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.10: A particle travels at a constant speed around a circular path+j47gb axyigph c*:1b )c-au/( 3mjikdwcw m9 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 without reference to a particulah:n r+0 flqt:ue p,uq/r direction is h:te:u,np0+qflq ur / 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:q2 jsb5nbs o5 at an average speed of 50 m/s and then cs5 o:25qbjbsn ompletes 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 0.803xps1pvk jx7 7 m in 1.0 s at the constant velocity. If it continues, how far will it travel 1xj7vs p3p7xkin 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 that is sliding at 5.00 m/s toi5 cht0 v)vb0w the right across a frictionless pond. The boy then turns and starts walking on the plank at a rate of 4.00 cwh0)5vtv i0b 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 kchmek1 m1.r:e m/h and 400 km at 100 km/h. What is the average spe1m .ch:r1keme ed 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 travelin;* 8rhv 9 jtpmfyyvo6(eq*o3d:88m(fa mrsepg along the x-axis. The graph shownrt 8yvmshorvqe(yd8*e;:6 p 8jp*3aofm 9m(f 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 ti99 m8f7 bhh3 r2gz*t0mmkhz of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the x dihzgm rkb zm8thm2t 7ih903f* 9rection, $v_x$ versus time $t$.What was the acceleration at 33 s?


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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.22: This question refers to the motion of a toy car traveling along the xncm3vwrj7c+;3 l8 mrb-axis. The graph shown below is a plot of the car’s velocity in the x direction,l +mbjc 373rmcr wn;8v $v_x$ 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 flyingfngc ; ey.7d)i/uz+r l due south for the winter. At what point did the duck stop its forward7fl)yie.n+zcd; g r/ u 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 posdjw.om62xq/(1-s8p sb +/cwj +zjwawe0a vroition and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What ww advs2pa -b s w6om. 1+/(r0+o/ zwjjcwjqx8eas 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 whic9k udrhz2sh/fj2*jaj+dbw e pm:;:+fh shows the position and elapsed time of s 2u9h :jz2f/jjp dew*:bkd+f h m;ra+a car starting from 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 velocity time graph for an odzroz 6vlg f n+)3ip0*bject with the position time graph shown in the diagram at right? *0or6l g+pifz d)vnz3


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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 7bbx +h6x:sqm refer to the following information. An ideal elastic rubber ball is dropped from a heigx+hmb 6 x:s7qbht of about 2 meters, hits the floor and rebounds to its original height.
Which of the following graphs would best represent the distance above the floor versus time for the above bouncing ball?


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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.29: The following question refe- jd) cm:)hg4ca z+uv+9yeque r to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds ezc-e) huq+4du9 y+ cv:j )gmato 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 speed obi w ; 3z,;hz6lwwzfy1f $v$ 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 re2n0 zng(z9pl jso*8 45n gmvnsfers 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 followc4uwchj:nqg;t /tw0m ) z6;bx ing scenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
About what position after $t_0$ would car #1 and car #2 have been side by side?


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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.03: The question refers to the following scenario ,g2zrn21s apt: 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 refers9l jmks)td7n. 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.
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 t o6vj zui*u0/1w(qbmn able top and off the tab*i0/ mb61uqwjnuvzo (le edge. Which of the following would best represent 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 represents the v,)b qnjy /zj+c2 dsb3relationship between distance and time for an object that is moving aj2szb,b) + j cd/q3ynvlong 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 78)ck 3ydaoihdistance and time for an object that is moving along a straight line. Between what times did the object h3doay)k7 8ic 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 strmpn :xy jt54.gaight downward on Earth with an initial speed of 12.0 m/s frng jm54t x.y:pom 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 repr dz,*m;naf4fd.efh4 -n k6lsresents a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start a ed.f*nf4dr6 snkalm;z -h 4f,re 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 unifor 9dk ,zq3fxq8amly accelerating across the floor. The time and dist3 ,kadfq8qx z9ance traveled from the start are shown in the diagram.
What was the acceleration of the cart during the first 0.4 seconds?


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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.13: The diagram below represents a toy car starting from rest an4*xj 2dfdu+wiavf8 z4 d uniformly accelerajf48xd+ z4awuv 2 *ifdting across the floor. The time and distance traveled from the start are shown in the diagram.
What was the instantaneous velocity of the cart at 96 centimeters from the start?


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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.08: The diagram shows a uniformly acps2s-n02.ats8ii k yp mu*r4hcelerating ball. The position of the ball each second is indica prshm2a.t yiu 8sks0 4-*nip2ted.
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 positfv5aqspghhrle/* 8 j6:cy8)oas( cv*ion of the ball each second is indicatefoa j/hvcs)8pag 8 :lshq5** 6cvr ey(d.
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 clo8 c klx lq:h 5rgqku.jq0u72q;wn on a unicycle moving in a straight line is shown in the graph below. 58hcu;qql .ugkq0k2lq :7xj 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 moving in a,lkq0iv bl,t) straight line is shown in the graph belovql,b)kli 0t, w.
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 fw4tvhova5mg6-.; sg /suf iu7reely 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 -f; bfmatd ,5x kjkjmu 0pumo.) (1ev:a marble on a table top for 10 seconds. For which time interval(s) did the marble have a negative vu j(:0kv.emmp1 ;dxfku, job fm a)-5telocity?


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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 -egy5 c1bu wznyu6a9; a marble on a table top for 10 secona5 6 w-ub czyu1;ye9gnds. 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 accompanyinggojg,07);kh x(mqg rk graph describes the motion of a marble on a table top for 10 seconds. What is the marbles average acceleratg ) mk(r,70ogkxhg;qjion 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 uniformly frkx5em8jlc: jq-7f -qe om 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 straight daens*fjs q mljs255z 6o8m5*bownward 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 c14sp(b2xp a:jz v; z fq,:mzz a3rh*ylorrectly represent the motion of an object moving with a constant(vp3z4ax: qhb pyz,zmf* r2ljz;1a:s 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 describes the motion of a toy car across the 6m7uzg9u:2k ,scjxrhvt +o v 2floor for 10 seconds. What is the acceleration ok +72us 6 2xo,vjzcvrut9 :hgmf 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 the floq7m2 pd +c n7gogoby1yj4 v+)uor for 10 seconds. What was jg yd+ 7yc1 4m7bpu+)oo qvg2nthe 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 toy car7qir1.k v x6ui across the floor for 11i7uv xr.qik6 0 seconds. At what times or time intervals must the net force on the toy car be zero?


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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.03: A car accelerates uniformly fs 4m5ds+m irxta9v83 ,ft)wddrom 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best re ds+md4vsfd3i5,w8)tm9x trapresents 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 v;( eg*y +kngfmo hnr2+ersus time curve shown. Which of the following stat ny++*r2m o; kgng(fehements 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 gyq:-s0cby7nbbi/4z the x-axis according to the velocity versus time curve shown to the right. Wheng0izb b 4- nc/s:yqy7b 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 int6l xs)c v)yr.lerval 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 bay) 6)scx.vl lrll 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 otjsjr -l2buvc6d) .4 fcher.u)-df.2 jcb6 4srjcvl
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 (3exqli *f :2h.jdev )zr5 nbxacceleration is positive and incrnf rx5(*b:ei 2d3.vhxqjl )e zeasing

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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 averagb9c-oq o 4 wrg4f;axt8e 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, 9 xjaf7dgr4. uwhich one of the following choices identifies quantities that musfru.dag4j x79t have the same direction?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.17: A toy car moves gu jl.)8b:k, v smts+s$3.0\;m$ 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-tu01er w ihd53jime, $y\;vs\;t$, 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 hdo n 8p92 ay cf;80f/7psmacfxv,z k*a one-dimensional track for total time T in twonfvm/z0ap o * y c98;,72a pxfhfc8ksd 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 caf/p suk 3q66asr on a straight track is shown in the diagram. The tkp s6qs6/au3 fhick 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.x9ulw k , n8pg5cxh,t car on a straight track is shown in the diagram. x9l t, wpuhnkxg,8c5.The thick 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 o.m7ea cb tbsm3.l1*cak0zc j3f an object given by the position vs. time graph shown. For what time(s)*b c.k3 tcj0.3l am acsbez1m7 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 mu9w 3. :cd4nrnm6pawme graph shown. For which time(s) is the acceleration of the object equal to 0d w: 3mpc.nn9wu6am4r ?


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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 *8 td7jr .,ijb41z1 d nioy kicdi2b;eacceleration vs. time graph for a fixed time interval of an object’s ;ki.djbijo1z1 7r tyd,d4 ien*2ibc8motion, 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 increasing speed.-y/q*m3x 7zeupcy lso0 3kfh1+f z3db
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 p ; 6ki6 wz2jo,xec2.qb z9qkrrarts:
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 gr7u+hlx0hn 6 2l49mrli- eujpmound 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 reache, t/hx,6q: mpqrj d9rhwk:u /os 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 moving along a horizox)i+: 9bo*7d rzgs hak1ujri ls8x53 hntal axis is shown. What is the total distance traveled by the particl3l7ix *1a oj s bsxui8g)rh5 r:kdz+9he 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 choices0pxc 6ro x*q+s correctly identifies all of the listed situations for which there is a non-zero accele*qc+xrsxp 6 0oration?
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 movin ye/lc9mwcxv en6ax9sa. l386 g 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 stm6sl /e9 3y8l6ec9wnxc xa v.aarting position?


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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.17: An object starts at the origin and its velocity along a line vs. timwfaepv26;-/ezw)vv 2 ( kcpjq /pk j2oe is graphed. Which one of the following choices best gives the proper interval(s) of time for which the object is moving away from the origin?vcpzv)j2eqwp2j- / vkpo/w;fk 6ea(2


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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 mno6k27o/ bwnhorizontal track, each with constant acceleration. At an in 6o2on7k/mwbnstant 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 position id*sf)4t rtb,$x$, 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, wav(u 5o1yx m4lfwb (g+0m)wl ohich one of the following choices correctly describes the relationship between the average speed of the truck to thlv(ol+u4b yomw 0g1xf a5w( )mat 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 instanohs ; fe;52 p6rqcj,4qzi* 8epvaycq8ts of time, at which the c;,q q*zvs8opafy 5jc;2i6erq h p48e 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 9e,:.fu 7dq/ rerqldq jg57ueorigin and will move along the x-axis. The acceleration vseu: .djq f7 g,7lredqrq 9e/u5. 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 objhlbv:4 (o kokrvp,d 98ect moving on a horizontal line is shown. At what time(s) is the object moving vr48 p,v 9doblo(:hkkwith 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 followf+7;bffdj9h usw);4f y d2pr aing the position vs. time graph provided. During what time inhu s4+wj72dd)y af9pfb f;fr;terval(s) does the mass have zero acceleration?


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