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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 trbuogy+*nd+nvf( 0rwr, 1ur 4 havels at a constant 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 distance per unit time without reference to a particular dinp* gg lziqx6p03 2 m02kywo1wrection isgm*o6x2wilp2 y3pq z0wg0n1 k 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 a rz(e:lh4m(3prg 3bal round a circular track at an average speed of 50 m/s a bg(hezmp34rl:ar( l3nd then 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 0.80 m in 1.0 s at the constant lei+-;h )nkanc +he7ou -.x unvelocity. If it continues, how far wiua u-hhen+ e c;.lo)-nik7+ xnll 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 h; z/m)i vq x8l-pb1osplank 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, relativ;1hls obp mz )qx-v/8ie 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/h. What is thum9quj9g17k he average speed of the g1 h7kujq 9u9mmotorist 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 utp6uh c (u ptpx* 9wb/f(t.w,of a toy car traveling along the x-axit 9w/ t6(uc.pbt(upfh,uw *xp s. 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 (opq+ hx,lrq( -7h:pl8ikdzsm4y*p tthe x-axis. The graph shown below is , k xts(+h4(zrpm iqodq7*8 p-hp:lyl 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 the motion oe)qzla ycr0yx: n1wm1 8:lhs1 f a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the x dire )e zxm 8:q1hsn11r:cl0alyywction, $v_x$ 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 flyingqxiy ).*kk2ug due south for the winter. i2yk*)u q.k gxAt what 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 belo- vr4 80rxlivekg2f r,w which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the 4rl,v vrefik0 -gx 82raverage 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 shows the pl * pjr66d z *jwbrgr0a:ob)f5osition and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The )zpg6jb:lbrfr*0 aw 6j 5r*doaverage 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 object withr j0qdke8vscz5, pd-8 the position time graph shp zrj50,k vc-e8dqs d8own in the diagram at right?


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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.28: The following question refer to the following informatio49 (eydj d v/l uv n:2juxl8rf79ha6gjdyce 94n. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its oy4vl4d a fx e9ljg(h e2yu/:vc9uj98drj6n7driginal 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 refefo56d 70hfx dnr to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to f 6n7ofhd50 xdits 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 try t/n6 j .(yq8ek3u ju6jac:emavel with a speed of $v$ in still water, which of the following trips will take the least amount of time.

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.01: The question refers to the following scenario f6f 2ecmqpk hzhvw)t4*-n82g: 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 scenxc m:oshau) ,. f.; ie4qpfq7vario: 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 qs (mk 7wu: *djwlea u(;-,n 7neust(sscenario: 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: qbbdr,;61kv e8pp0b1g v9 eo mAt $t_0$, 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 r,s;yc :zmje 7hamp, across a horizontal table top and off the table edg7zc:hj es ;my,e. 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 repre9k eb2ii:c7 casents the relationship between distance and time for an object that is moving along a straight line. What is the instantaneous speed of the object at t = 5b:2ai kei7c 9c.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 timwn/.((yg rjtqpp3zvtic uq 6l3h8 92k fd4c6re for an object that is moving along a straight line. Betwe3 vrlt(p.uf 8y/t4r6 9nh(q3ziwkdq 6g 2cjcpen 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 s2euryod. 7ncrtw/p6 .peed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resistance, the speed of the object when it reaches the ground is67r2 o p.uyc /e.dwrtn

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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 belovk*g w(r,(7d(wdyug8y:nw fv w represents a toy car starting from rest and uniformly accelerating across the floor. The time and dista*8v7,yddvu fgy(( :w(wnkwgr nce 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 startfc+2ro)9v1za; ag kiuing from rest and uniformly accelerating )if o +29zkgvra1;aucacross 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 st .() ,op:z3 c3wp q,rgf;/xviqyqwy qvarting from rest and uniformly accelerating across the floor. The time and distance traveled from the,qxvo3r i(w,f qpgqq p.;y)3c wyv: z/ 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 of t *)dh*dri xu7ggvx:v+he ball each second ig:7x)*ig *vhv ddurx+ s 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 :bwk)vd,lh /,isz-h z 4s0dyyaccelerating ball. The position of the ball each second /y)v0,dzs, bdikzl :ysh4h w -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 sgt p/zeu4/7 m,d )zjbytraight line is shown in the gra4ypg u7t,m) b/zj dez/ph below.
What would be the acceleration of the clown at 5 s?


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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.18: The motion of a circus clown on a unicycle mo xi3dt96aot(gving in a straight line is shown in i a(3to6gx9tdthe 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 surface of the ea;w( o e3olxxz nr5g2ed5t:c(o rth

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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 fh8thso(zjht// (vmu,*hk:/xkvvh.jg/ p i 1 motion of a marble on a table top for 10 seconds. For which time interval(s) t1u,kjt*z(v/sj phho/ vg hf :(x8 h mi/hkv./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 t (mm pw on4/n x.7:fixgv5isu8he motion of a marble on a table top for 10 seconds. For whicug8 4p isfmw v x7(n.ox/min:5h time interval(s) did the marble have a positive acceleration?


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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.13: The accompanying graph describes the motion of a marble on a ddfahv,f85j0rf o8r n 2a.sf(table top for 10 seconds. What is the faf ds0( hfrr.a8o285d,jv fn marbles average acceleration between t = 3.3 s and t = 3.8 s


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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.20: A car accelerateaiu fz+x x-6o8s uniformly 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 straight downward wldks,vkjj/ rkj6,nj2jn(w4 + ith 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 mh)2goi.(gkx nm/i 0 yrepresent the motion of an object moving with a constant 0mm 2xongk).yi hg /i(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 floorlde 1-de2xgz22szwa5 for 10 seconds. What is the acceleration of the toy c dze2-w d s2ze51axlg2ar 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 m)g ( w(0+ agi3:cqckdg :rsdaxotion of a toy car across the floor for 10 seconds. What was the total diqcwxg(d kar3gsc:d i):0+(g asplacement 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 yp*rfoqmi6 d0-06 1b l0ianzc graph describes the motion of a toy car across the floor for 10 seconds. At what times or tinomyi zdf6c00 aq 0-1birpl* 6me 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/hr to 60 km/hr i4dw3j a b:4 j(8ctmuks ( +ofih-y2zapn 4.50 s. Which one ok bp(ija wyz(usta:jh+24 4o3 fmc-8df the following 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 lyjc8o3z; mdyo a;+n-nn, .lgshown. Which of the following statements regarding its motion is NOT COR .y-;c+a,djn;l ong nl3zm8oyRECT?


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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.1 s)midgwy 5a to the velocity versus time curve shown to the .1adw5sy)img 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 ty/ o)vz:v;k6op n1v+7.jbueci dv/uq ennis ball is moved so that the angle between the velocity and the accelerativv)vzj .ey:7vk ;n pb1u+/oc/iq6duoon of the ball is kept at 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 kilomete7gz+- tbg0y w suk:uh(rs apart and traveling toward each other.utb:+-ghz 7gs( 0kwuy
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. When08hr4zfs nqcq 38x)0s /aj-az5foud f the acceleration is positive and increasz q ocf-8q)/ r4z8n5as0dj shfau xf30ing

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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,fz 2*i n+:vb*lbvuqr average velocity is

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.18: For any motion in two dimede214 l 16k9 vrjej;o n7hueponsions, which one of the following choices idenk uv ed2loj69j4n;peh re71o 1tifies quantities 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 moves 9f05 o5ocql.fw*:swd hd6yw b$3.0\;m$ 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, eari 1.;xmeg 4,(2wo4zlurnp $y\;vs\;t$, 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 o1d: vlmi)g x6jne-dimensional track for total time T invjixgd 16)m:l two parts.
• Part One: The car maintains constant non-zero speed V for the first $\frac{3}{4}$ of the total time.
• Part Two: The car accelerates uniformly to rest during the last $\frac{1}{4}$ of the total time.
What is the ratio of the distance traveled during Part One of the trip to the distance traveled during Part Two of the trip?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.23: The velocity vs. time graph for the motion of a car on a straightky8s 1 orntmgz.equxv28+y;x*.m -qky) h+ kk track is .y8kxyq nrey;okh.u2m vszkg8-+ k * +qx)m1 tshown in the diagram. The thick line represents the velocity. Assume that the car starts at origin $x=0$. At which time is the car the greatest distance from the origin?


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.24: The velocity vs. time graph for the m.l8 -vtzf q9 sz0u q(n7pfw)omotion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that the car starts at)sp0v 8fwqz.(9 uo7l ztqfm n- 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 ty89: asp. xvpnf2uvg wj.3aa dvd.;,given by the position vs. time graph shown. For what time(s) wvva2vdpg9a,a3n ;jpyd ftx8.:su.. 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 bsrk4qd:8hkyn3:i* m, .mblw qy the velocity vs. time graph shown. For which time(s) is the acceleridmqq rb*w4k,3lyh: .8mn:sk ation 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 vs. time graph :z c8t/ aziwep0sf+w1for a fixed time interval of an object’s motion, what quantity has been determined for zpatc:w w+s01i8efz/ 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 h gbsjy(bjv8v8;j *0) hkb lp o7n*u4mxorizontal 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 tzmxb9c e1s1c+c73(d 9nrx)bg sr lnq5wo 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 a tt:mxcco6+p ,eime 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 frc c3kxhp *ahuh;,eu) :om 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 moving along a hoklds8p hekz, ifo9y2 r+-x5.hrizontal axis is shown. rzpsdk,oe5l8+ hif x9h 2 k.y-What is 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 correctly identifies all o9*s7pm ka es3aj96 gk(:giwu cs4q1u, lbbz1tf the listed situations for which there is a non-zeraw m7* az(l,1k4ketj39bs :ci p19gqus6gusbo 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 vs. time graph for an object moving along a line i3ovutf4pu .d .mz.q/b umkb 7/s shown. The object starts from rest at time t=0 s. At what time(s) does the object attain a 7.4/bbtp zvfm .u3k.mduuo/ qmaximum 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 c6r+l7i svw qfj6+ j6yits velocity along a line vs. time is graphed. Which one of the following choices best givy67 j+ f6ivl+j6qsrcwes 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 i )mycf;*p (19knw shqthe right on a horizontal track, each with constant acceleration. At an instant of time, the informatioim( cf*9hnp)1w syk q;n 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 position0)qfqb ko7 gw:pfj). q $x$, 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 o:qq/l;+. rj mf7la3q.yaqi z y20qe xcf the following choices correctly03xa 7f qmlql2;qiq e.czajr/:qy . y+ 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 choicrfvd x, v/+cj0+kqoq5es best describes the instants of time, at which the car and t5+ /qdvfokqvjx0r+ ,cruck 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 fp7jjt8t8j -qat the origin and will move along the x-axis. The acceleration vs.p 78-fq8jtjjt 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 kcbw (eh.4v.b3e)s unan object moving on a horizontal line is shown. At what time(s) is the object mb n ewv..(k)43sbe hcuoving 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 k+6dmad* 6tsq) 4mlbpalong the x-axis following the position vs. time graph provided. During what time interval(s) sdtpl*k4+d a ) mbm66qdoes the mass have zero acceleration?


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