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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 of radiuw.(pk b:w v+ wqnu:ds7s $R$, 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 withqao +- ;.sh3upii2rkx out reference to a particular direction is cal- uar+q23kisxpi;h. oled

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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 compl6mr+8t y8 j -,.bi-rqggav xrjetes one lap around a circular track at an average speed of 50 m/s and then m .jbg-rryqr i jt+v8-6 8,gaxcompletes 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 velocixkjepx8uo( sjv(-0b- .uce + kty. If it continues, how far will (0ev.+x bu-(s8-opckjx jeukit 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 plank that is sliding at 5.00 m/s uqu.h4fma y 8l+e-(pg 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 thaplfugeh m 4 +y-8(u.qe 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 .q rs.y*(kai z100 km/h. What is the average speed of the motoz. ar*sk(. qyirist 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 caru(6o,eye.+ diz;rz i/qf*x - 7o l*qbsw jex,s traveling along the x-axis qsl 6*,rwoubqs+iez .ei/ ;-y,do7zx (xjf*e. 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 algsdu.jt+k s6fl6h.kf+bux x w35 /(rlong the x-axis. The graph shown below is a plot of xgds+fjf(xl/. r+kwh35 6btls.k uu6 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 questionurwy.6r- r 7tnwc6 u1a refers to the motion of a toy car traveling along the x-axis. The graph shown below is a plot of the carw-r c7n6w.ary1 uurt6 ’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 graphckdp dzvq,4l283 umc-;cq563nzaw ty of the velocity vs. time of a duck flying due south for the winter. At what point did the pq u536 y8zvmzlcaqd2 n;-,twdkc4c3 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 r a(gy 1gr27l a, za)kw)ipcnl+efer to the diagram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the aver1a(r2ngg k )+ycl i,7l)pwazaage 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 buxi,5r,x y2ne6j l s3rz7 uel6elow which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleration during the entire 3 su 23sxlr7 lr,6inuz6 5je,exyecond 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 3b h1)7wr3of f .iij2l(smylei9s9scfor an object with the position time gio.s9bflsi) 39i yjc fh1 m3lrs(7e2wraph shown in the diagram at right?


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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.28: The following question refer to the following informatio xet6dn b43g0bvr-- ,kyuyyl;n. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its original ry4d nx0 ,; g-kb buyv-36yletheight.
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 fo uy3c ;l-zegbe3z,f 21/nt.xrgivyq 3llowing information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits thun1z e , blz2yi.3gtg ;c-/f yxqer3v3e 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 travei/b 9 j(ifo5 3u6ayqfc1rr;ejl 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 refeh isxw1 z4+g:ars 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 refersv/ r2xclsm/-l 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 refers to the following b9gurqbhqbm a( s b) /b5bmkw:ll5+0 r)4,ptxscenario: 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 followinrp g (;b) spe+cb,4- ofvknn0pg 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 table to-v pz*y.k5sl7+.bhihqpq 6 ikcbh n-9 p and off the table edge. Which of ybh-5.i s+6-.l*9chqp z7nqvb k k phithe 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 gc, c*r9 5:td9 pupa(qjc tai6relationship between distance and time for an object that is moving along aa cq9c*ad:59p(up ritgjc ,t6 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 represemste/ 0 vp i.w*yz0cn5nts the relationship between distance and time for an object that is moving along a straight line. Between what times did the object have a non-zerotiy0ms c w*.pn05zev/ 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 spec2:hmy.s1 nx 0p5ka qeed of 12.0 m/s from a position 10.0 mekp0 1sn am2chyx q5.: 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 car starting from rest and5yb) zdw,/m6m e tfuj6 uniformly accelerat db6zyu, t e)jmmf5w/6ing 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 t8s qv21iw uid,bbs.w x-yk(1boy car starting from rest and uniformly accelerating across the floor. The time anbw yq,-( i i.bw1 uxb1vd8ssk2d 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 repres1r,4 50k 0rvet9cni5s r pologents a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled frksroro5vlpc95ge, 4rn ti010 om the start are shown in the diagram.
What was the instantaneous velocity of the cart at 96 centimeters from the start?


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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.08: The diagram shows a uniformly accelerating ball. The po /n3,fppu fdx 5v;oe6cg;wd3isition of the ball each second is ipoed;6i3 xcdpu /3 5,gwfvf;nndicated.
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 und8x- wfh/ls7r 9bapf (iformly accelerating ball. The position of the ball each a / 9x(-rl8d7pfbhsfw second 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 movixs/ki unrt2d: 3/d r 7zqrt;r7ng in a straight line is shown in the graph below./t/ r2idru ;r737k:n xsdtq rz
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 straight linwxnjtow: . 6o t3apq02e is shown. qnop26j:3 xwa0w tto 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 neaeq9-z k j5hod bun51fcr:58yi/mks) o r 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 describy;bte*ebf-a kkyx2ev3u ; 6e/es the motion of a marble on a table top for 10 seconds. For which time interval(s) did the mby/kb;e t* 2y v6e;-ek3fueax arble 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 af3b;9coni1otc0fma a xy45ah+r 4z m - table top for 10 seconds. For which time interval(s) d;3nf4+10 4mh-abtxocif9z cmoray 5 aid 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 azg ra8gfb yuvk68x, 3) marble on a table top for 10 seconds. What is the marbles average acceleration betweegfxgzya6r ,b 3u)k8 8vn 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 unifoe5ksz, q p 8ej+p1yqr4rmly 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 strwc2mkahcpyvq7 x7 r)pul*4q)rzrars :(8 8*kaight 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 grapch (y /n */*xzfsacx*ghs could correctly represent the motion of an object moving xahcc s *(zyg*xf*//n with a constant speed in a straight line?


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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.24:The accompanying graph descjen 0z.a.r 3mgh3yxi,ribes the motion of a toy car across the floor for 10 seh.,r emiajy . 330zxngconds. 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 desc )facoae76xho b)kw34ribes the motion of a toy car across the floor for 10 seconds. What was the total displacement of the toy car for the entiref36a )oe7bx chk4 wo)a 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 d1b 3z e7y;smruescribes the motion of a toy car across the floor for 10 seconds. At what times or time intervals must the net forc3;eyr 17zbsum e 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 accelerq a9n +n06cp wy,*dgbyates uniformly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choicesbn 0 w*yq9gan,+ c6dpy 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 the following s 1aa5-/oj80sjn gvzvmtatements regarding its motion is NOT CORRECT?saj8mnoav1-/g z5j0 v


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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 vers r(rj9vny/;k wi8yf4n,fq c i9us time curve shown 4c, inyniw9r8k(r; qy 9/vf jfto the right. When does the car have zero acceleration?


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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.22: During an interval of time, a tennis ball is moved xrwtkuu;.58 uso 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 ball during this interval of time5tw uux.8r k;u?

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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 eacd28 ,yakwb7vx0g6kum1j w1k m)wem 6xh other.k)81 wwk0mwmygbx kxe6,m d261au jv 7
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. Woi h/or : n+l+2m)m 8hrxdt(e.apw-o zp*seg:hen the acceleration is positive and increasingx:nm /( rpgom:)h leedh+st *po o+2-8zaiw r.

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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 s 1(xxi1*rz 8vimaxwf+f6p6s1 6x bgdaverage 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 5g61 g .upd fu+ymrn+ytwo dimensions, which one of the following choices identifies quantities that must have t +g. f+yug5 r16dmypnuhe 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 s- v*2w qqyed +p:6ipj,vo5se$3.0\;m$ 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-til pii3g9k h9rtn cm b-.4hj0:bme, $y\;vs\;t$, graph for the motion of an object is shown. What would be a reasonable equation for the acceleration that would account for this motion?


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.31: A car moves to the rig x7x9nhc dk+8 ljy3e;eht along a one-dimensional track for total time T inedxy+78l 39kejhcx; n 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 g( fpfq/sn2:t- yq ogb*raph for the motion of a car on a straight track is shown in the diagram. The thi:b- f(p q *yfngstq/2ock 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. timown(1gfgrsm 8pl -q11e graph for the motion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume twm -g(1r8 os fplqn11ghat the car starts at origin $x=0$. What is the average speed of the car for the 10 second interval?


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.08: Consider the motion of an object given by the posit,j;5xbe8k2-.7cn mloysc zx m ion vs. time graph shown. For what time(sm8,s7yxzb l ecjokx 2.m5-n ;c) 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 veloci;1c5 d uswbjxs9rz)h +ty vs. time graph shown. For which time(s) is the 9sxc5 d h1wr)b;+jzu sacceleration 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 vsby u) m*+x-q1x pajqgz(x*p2j dsc8l.. time graph for a fixed time interval u-msqyb qpx 2za1j)gp.+xxl(*d jc* 8 of an object’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 moveeeh3 2/k w-gqr/2 xo2hf3dmrfs along a horizontal 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 two-d e( g7um pg5,ep6ioprgbr* :q1j)vf 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 releafz(gahkhfl* z b;i)c:z 893q used from rest and reaches the ground 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 objectv o5rb/1pv ,zs is released 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 g -wq2j/-l:zodrk b et8raph of a particle moving along a horizontal axis is shown. What is the total distance traveled by the particle from t=0 q:e/-2 rwlkoz b-jtd8 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 tl,s 19 (wup)ngl85bfd ng5o cidentifies all of the listed sitlf)gn5log85bs(wn u,c 91d ptuations 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 lu 086f e;rfg8a-71ofxelma u vs. time graph for an object moving 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 itff oal8g axue;e08 m1- 67fulrs 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 along a line vs. xu9kwz:nig v yx21j,il) 3me( time is graphed. i3x i)2vn:jy( zumg,9kxl1 ewWhich one of the following choices best gives the proper interval(s) of time for which the object is moving away from the origin?


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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.09: Two cars are moving to the right - 5q;jkv5kbnfg tooc* r ;6tqhh8k4tp 9b-qk+on a horizontal track, each with constant acc 6b*fk;jnqhotk;q- tpkg c kbh4o5vq +tr8-59eleration. 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 positiq4.zf( rb o7mgon $x$, 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 7:2a: u jeowc aj5(s0 zp e*1bezp55hcjdvom/one of the following choices correctly descce 0:pwzoa 2p5eh:vj( 7j 5 /ajzd s5*b1eoumcribes 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 instants o(ml:l50xq ysof time, at which the c0 m 5(:lxlsqoyar 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 v khx8.zm; *;i) iq a:zerjf*iQ, each start from rest at the origin and will move along the x-axis. The acceleration vs. time graph for erjqf;i ikv z*m:zx8h;a.*e) iach 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 on a ho-d oei,*pbv0 orizontal line is shown. A*i voe0dp bo-,t what time(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 along 2 rhvrdbc8 ppp8 0:yv-y oby;8the x-axis following the position vs. time graph provided. During wha :yybpc8dp;r2 h prvvy80o8-bt time interval(s) does the mass have zero acceleration?


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