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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 lv+xhfih8 3rap*f0;k 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 distanc0it4 lsgs.ycri3 ;xu9 e per unit time without reference to a particular direction is c.g tr90 xuy4ilcsi s;3alled

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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 at an average e62rvqba9 me; speed of 50 m/s and then completes a second lap at an abe2a6m rvq9 ;everage 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 velocity. If it conti+6xo8(cud6h2k d- gdf wu*so xnues, how far will it tra 2 -u6soxkodhw+uc(f6*dxd8gvel 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 o4.3gu ilu7w dhn a 30-kg plank 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,ulud3. h wi74g 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 xc)f h73pswz 1km/h. What is the average speed of the motorist on schfx3)pw z 71this 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, 4i yp,/1s)8bqp mdz;3z4zgsjvmax c motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s i,/,m3pc)x4p 8 v1zm4 zaygsj;dzqbs velocity in the x direction, $v_x$ versus time $t$.
During what time interval was the car moving towards its initial position at constant velocity?


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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.21: This question refers to the motion of a toy car traveling along the xu p7cq59fp kydoe) -+an eb3o0uh+x k4-axis. The graph shown below is 43f dby90p 5poaou+u )hqe+xnkc- 7eka 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 rek5hx c8w2h3zaon 4 3rjfers to the motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the xxa35o2w3z4 hnkh rcj8 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 grap6jyvkxa ,*uy hk*k2yi p,r-0i h of the velocity vs. time of a duck flying due south for the winter. At what point did the duck stop its forward 06*-2hi,u rykpkvxki ayjy*,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 refe rpppk7)d(i+ kr 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 (kd rik)7 pp+paverage 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 position and eti( g n4))+w 1j*nbag(hzyofilapsed time of a car startiab)g1yiw4ng*)o nthj+ z( f (ing 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 shapuy, wvp0pb *oy*d25gge of the velocity time graph for an object with the position time graph shown in p0 2 vyw5g*p*,odugby 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 information. An i b;gn,w*o w4dydeal elastic rubber ball is dropped from a height of a,b*n4 o; wgywdbout 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 ref ktd09 ycae,icp drkw14o*e;(er to the following information. An ideal elastic pw14k9c iyec0*kr;ad, oe(dtrubber 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 speed/kyk 9wcrn kii)44ne: 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: Ane *wa)5d ryp1t $t_0$, 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 sb,s n: bcuqsk:6y ;5vvcenario: 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 refe ;73ihg6lgvw 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.
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 fod5bs*cmq2 ;s9 - jbicellowing 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 top andf9n) n-) mkch ttw-pk2 off the tabc k)-ft t2n)9mnkp-w hle 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 relationship between distance and time for an obbn ku .vh1,kf0ject that is moving along a straight line. What is the instantaneous speed of.0 vbn, f1ukhk 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 betwecb2p1v (ez76j -z vpcuen distance and time for an object that is moving along a straight evj(z7 cc-zup62 1pbvline. 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 oipia) t q4f;x6n Earth with an initial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air ;xpq4 i)fa6it 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 h m9z7 k7j1cl1 cu4tdgtoy car starting from rest and uniformly accelerating across tk m1u917dg7zh j clct4he 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 repud 3va4b+b9 r9w bfprek+xg ee5z59) st and uniformly accelerating across the floor. The time and distagupx9e +dpbz wf b5)9rvkr94b+e e3 5ance 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 rwg2 k;k6y op4uepresents a toy car starting from rest and uniformly accelerating across the floor. 24yw g6 okpku;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 accelerating ball. The position of t2f4 gj(m llt c(be(0kbhe ball each second is itgl2c(m4f l be(j(bk0ndicated.
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 posisyisro kp2 .h fxnt,3;. 8+ilstion of the ball each se syit s x+k8fh,rinp. 3.;o2lscond 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 unbxh8: jes5 sm 1u4/fo.op. jdeicycle moving in a straight line is shown ie ms:e/s jo5ho1.j8pb df .4uxn the graph 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 a7(l,qjki iny c5sn)iw, kuj5* unicycle moving in a straight line is shown in the graph beloswj yc75 l iu*,(jkqni)ni5 ,kw.
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 oxf 2 pl j9i;6ln (ojy3oef26rx9b7xqrf 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 theu 6gjq;swp:h+ c,p +d 2qhkqa7 motion of a marble on a table top for 10 seconds. For which time interval(s) did d; gq6 qkp c7u2q+:wjhp+ ,hasthe 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 n-9epoxyxh iu;65mq70(zms fdescribes the motion of a marble on a table top for 10 seconds. For which time interval(s) did the marble have a positiveep7z-n6 s;ofimm0yx q (ux95h 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 thvk8 fkz5r:h up/ al-y,e motion of a marble on a table top for 10 seconds. What is the marbles average accelerati:fyl58v- p,zk/hua rk on 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 from rest c :3l0qy+qvhy +5:ausyxho:d 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 straigtk,uko g84snz gc34rma9* l3ght 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 the motion4+c wxa63:dc;.expdn xt o a6m of an object moving with a constant speed in cn. woxdd+x;4 t6p:ec3ax6a ma 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 g:o4h- l y4qx +bmrbf2oraph describes the motion of a toy car across the floor for 10 seconds. What is the acceleration of the toy car at t = 4 4o4+:xbyom l- 2 bhrqfs?


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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 c-9hf rla4s4 wo0r7xwgar across the floor for 10 seconds. What was the total displacement of the toy car for the entire 10 secxw9s4lo7 4a hg-f rw0rond 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 c rx +k3q- dv6y7bdaap2ar across the floor for 10 seconds. At what times or time intervals must the net force on theb+qad y2 ka3pd-xr6v7 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//h8hu-u3v w asgxl4r,+jq4 xchr in 4.50 s. Which one of the falc,+h3-usjugx 4h4/ 8vx wr qollowing 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 vcwdf26o es :)oz s8 hx5 93.2lucsencielocity versus time curve shown. Which of the following statements )u2fn. hz6sx9s: oiw5secl c38cod2eregarding 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 the x-axis acco+ndej ,t5bh7ch*k0ka2 xp r,ink946 t pwq8 usrding to the velocity versus time curve shown to the r+2q4tpnjtxer,a *kd 6wu h9pi8n kc 5bk,0sh7 ight. 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 so that tumk82ewq/t4 a he angle between the velocity and the acceleration awq8 m4 /t2uekof 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 kilometers apart and traveling toward each other-q s-:lvmz/cyd8l-t xn 6*v gl.sx:8ytz* --l -mlgncv6/dlvq
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 :otyuueo:9 )z acceleration is positive and inctoz):u 9 eu:oyreasing

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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 velo ewrcsga vj1 h-b6270jwb,(kc city is

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.18: For any motion in two dimensions, which onez ,hzp*f. e;z+ l0p0p3 icrggr of the following choices identifies quantities that must have the same directhg 0i0;+,gz cr3plr* zp fez.pion?

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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 4bls- 5s1c39xpys,z x8 ynegj $3.0\;m$ 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-trk.ddjr(q(s5uhtj7s a5v*m2 ime, $y\;vs\;t$, 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 50;w9feh(r) /3ur t zkl gfancthe right along a one-dimensional track for total time T ie (3/0 ulrht gf )9;zcnfwa5krn 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 vb0ti+yfu13eelu0hxox91 jf.g/1nek s. time graph for the motion of a car on a straight track is shown in the diagram. The thick line reprlj3.k he90b1one+eugx10 ty u/ fix1 fesents the velocity. Assume that the car starts at origin $x=0$. At which time is the car the greatest distance from the origin?


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.24: The velocity vs. time graph for the motion of a car on a straight track itftz 02ahzne9 tqo ,rdq9 /8k.s shown in the diagram. The thick line represents the velocity. Assume that the car starts at orhattqd9tq 9 kzo./z 80 ,nfe2rigin $x=0$. 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 gibt 30 r8rb-s ;9uloqesven by the position vs. time graph shown. For what time(s) is the speed of the object grqe; -3 r9o0l brsbu8steatest?


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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 b ucobbv8- d/b1f3f +pdy the velocity vs. time graph shown. For which time(s) is the acceleratdbofvp3 1 cf/db8u+b -ion 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 for a fixed1u)3lklqdsb ;l :*e9 tstq6fj time interval of an object’s motion, what quantity has been determined for )sel l:9t; 63dtqsb1 kqu*jlfthat 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-n()*oeeu6gs )b1eji(jffb l 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 trifc;+tzvo lqdn) 5ym1-p in 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 tuxk 1 bl+(z 7k:uzfqa.he 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 object is released from rest and reaches the gdsx8 a*) ryak6round 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 movinggy 7t be):a21efia /,zffllb. along a horizontal axis is shown. What is the total distance traveled bta1 i7felefy) lz. b,bf :2/agy 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 identif;fukth:np)czb4 7v9lm/d ;w aies all of the listed au/; 9m;kw:pcf7 h4ndz)l bvt situations 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 vs. time graph for an objec ;kgjsna mp;j48q,8vs t moving along a line is shown. The object starts from rest at time t=;4;n jpsmgsa,q8jk8 v 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 alongs8ku+:kdd ij o2 c5,ov2zdde9 a line vs. time 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 origi + 82didsku:z92d coe,j5dkv on?


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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.09: Two cars are moving to the right on a horizontal trgdu*bkt;+l+6 c xk5 fiack, each with constant acceleration. At an instant of time, the information abutfcd b5lix 6g*+; +kkout 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(nuh*tax9tj 2 position $x$, 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 th 9h9rp;h 2plvje graph, which one of the following choices p l p2rvhj9h;9correctly 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 follmk z 8p 3l */i,y,zvv+jmoco8lowing choices best describes the instants of time, at which the/j lmcolvi+* 88,o3 yzzkvm,p 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 ;wtx7r.:, ,dzxdxtqbyf :5yy from rest at the origin and will move along the x-axis. The acceleration vs. time graph fortxxxwz.:, t:5;b fry7,qyd dy each car is shown. Which one of the following choices correctly identifies the relationship for both the speeds $v$ and the positions $x$ of the cars at time T?


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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.02: The position vs. time graph of an object moving on a horiz hdmu(.ylm9 ;k5mcx))h z1cevontal line is shown. At what time(s) is the o1hxuyvzmk d m.h) c(c lm9;5)ebject 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 the x-axis fo *k 4. .mek:gltlkslq1llowing the position vs. time graph provided. During what time interval(s) does the mass have zero accele:e qklk g.1l* .mstkl4ration?


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总分:72分 及格:43.2分 时间:不限时
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