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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 co u j*ck,08; gd*grtrzc fdv*3zf(g:sfnstant 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 tim1pddt+ /trkgsjf-r,,e without reference to a particular direction is ca +dkrftd g-,jsr/t1,p lled

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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 circula3jt/j.go )cn q7 -ilxgr track at an average speed of 50 m/s and then completes a second lap at an avera7c )tql no-/gjxgj.3ige 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 co+1zq8f+z6u5d *zbe) infpzr5fo flr0ntinues, how far will it travzl515r6rf0u++ffeo i fb)*qz n z8zpdel 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 stationat u6(,5 hqftvtry on 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, relative to the plank. What is the speed of the plank relative to th, 6fht(uv5tt qe 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 the 0kdcp5rdnkr 28 uq3f7average speed of the motorist on t02 fq nkr5d 7dcp8urk3his 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 tras 2 l)(lkbucd/ /22ye p:ptzgu+wpv,nveling along the x-axis. The graph shown below is a plo/ ew u/2t2(:pg)zy,cl upbdklp 2nv s+t 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 trbzb: i(mj tl z-x)yn(qx( c)-taveling along the x-axis. The graph shown below is a plot of the car’s velocity in th- z(t(:bnbj(ltxmz)q -y xi)ce 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 of a toy car traveling along the fp1plrx(p4/yiu);eo x-axis. The graph shown below is a plot of the car’s vopi4p)pr;ye1x lf / u(elocity 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 gra+gr 7f5a5wwem, 3 lfkqym5 x297hmhjfph of the velocity vs. time of a duck flying due south for tfw +j7 m3wfr,7xgh am5ekqlf2m55h 9yhe winter. At 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 ref+ynb )p; ghia4ymg;h4er to the diagram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating i gpn 4miy;)ha;b+ 4gyhn a straight line. What was the average velocity of the car during the third second?


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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.18: This question refer to the dia7l.knnm6r 7fm t0h)l bgram below which shows the position and elapsed time of a carlml )67m .0hb7nknrf t 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.u hsfl*am/bm62srfb r lnt/+4/ghg: an object with the position tt mgsf flm/ :6.shhr 4b/gar*b/ n+ul2ime graph 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 informat2qsi 8pfcnf8u)hf3q+tx6, m eion. An ideal elastic rcp squ)i26q3ment8ff8x+, hfubber ball is dropped from a height 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 refer to theax 81-6a lf(r,o1fknoqe54n g kslv8e following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to iqr efgn14o, vfo sa6k1e x-al5kl8n8(ts 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 wil,c9hqv4s ug,po wk-l6w- +eb6 2 kaluth 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 )v9; upqcdi-tthe following scenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
During which time interval would cars #2 and #3 be moving at the same average speed?


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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.02: The question refers to the following scenario: At kz5wcpuuj q o 6/i k-1ipk6)m)$t_0$, 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 scenariire 1m9c2 v su50f*pdgo: 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 s)/ puhpuadaa .3o7.yzz1u1py1vmat(cenario: 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, acros0;8.rrhh wf vb,w+web s a horizontal table top and off the table edge. Which of the following would best represent a graph of thw+8 ebr,h w;v wf0.brhe 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 ok0d9 ,h 0od9nw 2yxibhbject that is moving along a straight line. What is the instantaneous n,0 k9 09yhdbw ihdxo2speed 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 relationshi i5 kie9/ ta-88j8uf5 qwelfpsp between distance and time for an object that tf q l8a we/ie95j8ip8f-s5ukis moving along a straight line. 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 strai5 isti+pq 2,thght downward on Earth with an initial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resistance, the sp+,q2ihpst t5i eed 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 restbm(/rx2a(xtk u w4q o) and uniformly accelerating across the floor. The time and distance trave2 )bxq/uar (4 xto(mwkled from the start are shown in the diagram.
What was the average speed of the cart between 0.1 seconds and 0.3 seconds?


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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.12: The diagram below represents a toy car starting from rest and *8bvmml z fr i0v:/yv:uniformly accelerating across the floor. The time and distance traveled from the start are shown in thev:8b*frlvvi mm y/z0 : 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 bm-ua k-rh/-no +fc9hw k7k8xb elow represents a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown in the diagra-rn hhxwckm ok /-8+u kb7a9-fm.
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 uniformlyt;69kr0 ,ylofwst2n v accelerating ball. The position of the ball each second is innv fk;w 6s,0y2trt 9lodicated.
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 oor4/, 9 srpu v6mute60ya*ehuniformly accelerating ball. The position of the ball eay uvstu reo6 e4,r*a0mo96h/ pch 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 moving in a straight line isg3-l tppp--df shown in the g-pfd 3pt-l p-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 z(9t6id+ f u4g 7sas;haoe.dga unicycle moving in a straight line is shown in the grah(d. zgi6ua df7g+e;s o a4ts9ph 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 f)vkx(w7 evq,(xhokh( reely 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 gr- sbehgb46r90ryk x8gaph describes the motion of a marble on a table top for 10 seconds. For whghr0e9- 6 4 b8grbysxkich time interval(s) did the marble have a negative velocity?


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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.12: The accompanying graph describes the motion of a marb+bu- mnxt8-qale on a table top for q-+an -ub 8xtm10 seconds. 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 accompanying graph describes the motion of a mar* z .5m)dirp7igbg2z l00ax (p d9bmvkble on a table top for 10 seconds. What is the marbles average acceleration between td0m (i* a .7v29rbpxzkdlbpg) 05gm zi = 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 f*m4waoq/rb+5m i wqliuc 56i0 rom 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 dow eix ;7k/frlj*nward 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 graph:7mr t ;99rq)zf4. eibydlgdq s could correctly represent the motion of an object mov q4ytif z:l m.9;rre)b 7gqd9ding 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 describes the +t cps+/2 vg:p9j9naqp. w etdmotion of a toy car across the floor for 10 seconds. What is 9p+t2./nqjp ds9:vegaw tc+pthe 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 accompanyin*8nzq1vt d g *hgf9fy*g graph describes the motion of a toy car across the floor for 10 seconds. What was the to z9ft1n*vyh8gqd *f g*tal 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 8 ;8zig7rt 6ro9g ymrhcar across the floor for 10 seconds. At what times or time intervals must the net force on the toy car be zeo;7iz rmt gy98r rhg86ro?


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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 in 4.50 s.ty j,xgt9.5rn Which one of the following chog5.txyj nt ,r9ices 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 g+cwk)m6t 9a ok0:k;c-9umb;fgh e jythe following statements regarding its motion is b0a;-: hfwu kg9;km +c 6 ty9jo)ekgcmNOT 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 according to the velxgcl(6w-ny9g ocity versus time curve shown to the right. When does the car have zero acceleration? n (x-6gyg l9cw


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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 1)fodzd(ncl - is moved so that the angle between the velococ-z 1dd)nlf (ity 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 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 towardum vrfp;w (:-c each other.( c wpuvrfm-;:
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.o08spf-alw ,di k 68gb When the acceleration is positive and incwpa8go kd0b8,- l6isf reasing

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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 ua.m :z1b+r4hy t*o uyof 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 k4x4bislixv .;,zirvj d5g;6 dimensions, which one of the following choices identifies quantities that v45xi4bvsrxjg;.l 6idk , ;izmust 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 movesjl1*njv3r c,d s)x1h 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-tz bblaa3)y-px+py*a g1;yq, lime, $y\;vs\;t$, 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 2*i 1k t.yzdpxjg*r z:right along a one-dimensional track for total time T in twoky:pi.*tz2dx*1g zr j 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 stramc h.: mgb-w)x vs3zw.ight track is shown in the dcxm-3.:. z h )smbwwgviagram. The thick line represents the velocity. Assume that the car starts at origin $x=0$. At which time is the car the greatest distance from the origin?


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.24: The velocity vs. time graph for the motion of a car on a strvh ql7+9rj yh97m-mu eaight track is show -mvuqj 77e9 rh+9mlhyn in the diagram. 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 of an object f k2c:*qq/t gmgiven by the position vs. time graph shown. For what time(s) is the speed of the object greak2mf: tq*q cg/test?


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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. tii,b4(agjgv m4 )+)uaa g hk4zzme graph shown. For which time(s) is the acceleravai h,4z k) agg(4 4z)ugbamj+tion 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 fixed ;vkhv2t /x (ml og s8sij.f+zw5 *cc4otime interval of an object’s motion, what quantity has been determin2/5wl v8+comk zfx.i(j so4 s*thc;vged 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 speedp g ) m/4)g+1xrolhub+ttlb0 i.
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 gskcge/h/kie :hz m+y.ch x,6(1n4 ygtwo 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 re9d0rkxz/ye.pag u4 w0leased 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 object is released from rest and reaches the ground in a time of :( zflr2 bea8f:nwwl(30idp o mqlc 7;$2.50\;s$. 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 alon,, lik;zasyi-m0:(og h)dt vug a horizontal axis is shown. Whai(g-z:0aoumv h sdk) tly,;i, t 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 th.x5 f ztjel3o-0pixt2 e following choices correctly identifies all of the listed situations for which there is a non-ze2jxlzetto x50f.p -i 3ro 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 a sk3w 1tls;7,no uqb5vs. time graph for an object moving along a line is shown. The q,s uws5o7 t31lb;kanobject starts from rest at time t=0 s. At what time(s) does the object attain a maximum displacement from its starting position?


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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.17: An object startsm4q/d 98h 1ua4gwotyw at the origin and its velocity along 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 orig98/o 414 myu awtqhdgwin?


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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 track, each with coxch m( q b9xa4:5uz e.h(uy1z4s1fzexnstant acceleration. At an instant of time,xh(41xb4ucs(ye xz:5m1.uzf aq9e hz 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 positionpg 8 ar;nyf b+o *s*3io9hwklb xrz2,9 $x$, 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 entirq4aevi*9 /4v*z,fqa 4a nzpyqe time shown in the graph, which one of the following choices correctly describes the relationship between the average speed of the a9qq4y aiz4avzen,* qfp* /v4truck 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 of tix9ex3nvcm 2 0bsd (sg 7o7y-vtme, at which the car and truck travel with the sa9b(g7extvnm dsyvx- 3oc 7 02sme 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 ahr1 s:5g2u5 febdr :kat the origin and will move along the x-axis. The accelerationfd uskr52:eh r51:gb a vs. 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 t(;de:j ft om hyeb**4vs. time graph of an object moving on a horizontal line is shown. At what time(s) i; t*e yd*b:h jm4oft(es 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 the x-axis following the poskaem/jo/z;/1) +cy rm +v5hif ly;pyvition vs. time graph provided. During what time interval(s;ry)/ a1ic5e/ply/+f hvkm ; yzmj+v o) does the mass have zero acceleration?


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