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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 qibbi )n)b7)gla lk5uzw y:7e-fu -*l 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 unitds+kihm6b s:u3-c (hfh0y*dl time without reference to a particular direction sfh (ld+bhdhki36y0mc us - *:is called

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  12.29: A vehicle completes one lap around a circ2 /q lah6kkszdtsj776 fmv 3+wular track at an average speed of 50 m/s and then completes a second lapfs hkzw62 dm 7t6ljq7a 3s/vk+ 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 move;+j 5 au8ipqodsqc:5v s 0.80 m in 1.0 s at the constant velocity. If it continues, how far w doq:v5 c+u 8qp5sjai;ill 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 ig70ldm(mj2p 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 walkil2pm gi(d0mj7 ng 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 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 ah)vfvmu) 8i3the average speed of th 3mvifh )u)8vae motorist on this trip?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.20: This question refers top4(kq(qn o ezl(m2a,d/9 ygy i 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 x dir (9gk i,2ayey4p( nd q/(zmqolection, $v_x$ 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 travelingt.lo f2sykm17j (:dgg along the x-axis. The graph shown below is a plot of the car’s velocity in th: (td.gjmg1 kso7yfl2e 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 d nfwj :b/ sxm0k7)6yrthe x-axis. The graph shown below is a plot of xyn/6bjrf) 7 s mw:0kdthe car’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 graph of the velocity vs. time of a duck flyinc 4qqr*b0- twjg due south for the winter. At what point tj0rbq-q*4wcdid 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 below which shows the poj e 9j18zcr (mfypb4m2sition and elapsed time of a car starting from rest and unc zpjfmeb4m8j1 ( ry92iformly accelerating in 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 diagram beloiv7hrlf) ji- e8 v0vge3d4ws( ga ;:abw which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The averag38i(vbj;rifd7 e0 h4aasvv)g:-we lge 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 s ng 0).7tshwhvhape of the velocity time graph for an object with the position time graph shown in the 0hgns w v)7t.hdiagram 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 thm-0 q9hgse zr5e following information. An ideal elastic rubber ball is 9hsr zem-0q5g 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 the following inff1z,(7w*g hklg otuq /u9c0iz ormation. An ideal elastic rubber ball is dropped from ai u1 7 *,cu0zok9ztfhg(/glwq 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 wi c):qrn3xa ajgfg+.q3h9 tik*.-kvxfth 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 folloere1u8, x( h9ujr juciv4x;g- wing 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 s ycafqf2t n-0gihg; y,+ g;y 4:zf/sclcenario: 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 followcgb9(-z uff 1-3b p3 mly4g h:lxotjh)9ty5 mxing 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 following scenario: Ak/ 7byn m:+bltt $t_0$, 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,vz6i-i; 0i p.npog1 hn smf,/s across a horizontal table top and off the table edge. Which of the following would best represent a graph of the magnitude of the ball's acceleration vs time? 6svzif 1in;po 0.ph/g m- isn,


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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 relationship8f ;;u9+1wjbtci*ik/t avnu c4 rpqs1 between distance and time for an object that is moving along a straight line. What is the instantaneous speed of the object at t = 5.0 secondsr f jtk*a1cqi it1w98+nsbc4 u;vu/p;?


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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 a, jat isr-xm5t51m6hznd time for an object that is moving along a straight line. z-j,6xtrm 55smath i1 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 on Earth wit9hu5;vvnx yss +w7vs7,*e* gt(fefta h an initial speed of 12.0 m/s from a position hv*s t(v ue,5t f7+9*gfwe yn sxv7a;s10.0 m above the ground. Ignoring air resistance, the speed of the object when it reaches the ground is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.11: The diagram below represents-8v8yz 6d:l yxubjl 0o a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the staojy8lx8b06- l dvyuz :rt 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 t9cz 5tups ) 7*7*ohonx/ue 4)hfktfxaoy car starting from rest and uniformly acceleratinfk) ef ht4*xux9sn/a)75*otchp u o7z g across 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 toyw7*sc jrq/ r) w0)u *(,fs3li+pwgef vnpdy+t car starting from rest and uniformly accelerating across theu fir 3+l* 7tw0qwswe, nc/*)vp+jsfydr(p)g floor. The time and distance traveled from the start are shown in the diagram.
What was the instantaneous velocity of the cart at 96 centimeters from the start?


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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.08: The diagram shows a uniformly accelerating ball. The poslkasw *b275/+mwh ecsition of the ball each second is indica5k+swa/ c*hm l2wbes 7ted.
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 position of thgql; qlwbc+ f1z7j .+le ball eac jq1wblfc7zg lq+l;.+h 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 lbm x j55v-4jfa straight line is shown in the graph bev45mjf jl-5xb low.
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 libyuwl3o 78q2hcn54cue6k 3p mne is s2hn b34 q8elu 5uk7cc6om3pw yhown 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 neagc e gm)ia,://xtrsn3r the surface of the earth

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.11: The accompanying graph describes the motion of a marble on a table kv.* yauh2)kef;mz7. n h)y0hy 6vpsqtop for 10 seconds. For which ti na0us;*vpmyqf.v z.6k)hkyh )e7 y h2me 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 descri8ew*wvagy/orr n1 5cofa,. h) bes the motion of a marble on a table top for 10 sec fwgo1ya ,*re)c n.o5 a/wh8vronds. 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 marh6.bc (qcr(-s) b;b rqosz pf6ble on a table top for 10 seconds. What is thsp(-(ccq6.qs bf b)6 ;borzrhe 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 accelerates uniformly .1fjv8 v+h)gak vu7tw56gu nrfrom 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 wi )/6vxc19a, s fwtmxptk+l,k pth 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 graphavo 4fe2 8;gojnez.4p s could correctly represent the motion of an object moving with a constant speed in a straightzoea2 gvjfnp; eo8.4 4 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 m ky-z.:9q 8ztgegcb n/otion of a toy car across the floor for 10 seconds. What is the accelerationc gz/qt-:.ezb y8 g9nk 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 grap* rd p3na vvo;,980yeht4vri gh describes the motion of a toy car across the floor for 10 seconds. What was the total displacement of the toy car for th8a; e4ytgrv v*ov,ihn d930pre 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 accompanyinj)(k2)o:-ow -lfukh g.mgqu e6d om/qg graph describes the motion of a toy car across the floor for 10 seconds. At ufgm h) wjgo2oke /(.- domq ql6k)-:uwhat times or time intervals must the net force on the toy car be zero?


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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.03: A car accelerates uniformly from 0 km/hr to 60 km/hsjar;0j*gvq5 qy8if; r in 4.50 s. Which one of the following choices best represents the acceleration of the cq 0 qvjy85frsg*ia;j ;ar?

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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 n ;qeoch8ho9v5m zgr131ao * z+qbnt 7z6 llo9time curve shown. Which of the following statements regarding its motion zzz*1397qoo o hc8 g vhma6q 5nrblol n1t+;9eis 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 r7mb d/ pe)3tqthe x-axis according to the velocity versus time curve shown to the right. When does the car et7rd)pbq3m / 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 taq g.u7,. yowtime, a tennis ball is moved so that the angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true about the tennis ball during,ta.qw .uy o7g 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 automobilesp v/1snxtiu+ , are 150 kilometers apart and traveling toward each other.tvn+,sp1xu /i
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 acceleration is positive and in 60y2mxzjqf 0qcreas 2y60f 0jzqmxqing

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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 j h9j,og02 17p+s)tsc)mg lcc lrt -rpvelocity 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 one of the following choice 7a+ k 3(ltco5w)5j mzoqg/mqxs identifies quantities that must m(j5qo+ tz7q / 5ao3kcwlgxm)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 mov26egdr9g0-c gupe/xkh q5y .a es $3.0\;m$ 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,zrns3s -1k0ma $y\;vs\;t$, 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 one-dimensional track for total time T )w-1jo(,2ogxvt kz:o2wb z qyin twoxgo1 o2o( :wqy k)t,wbv2zj- z 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 u w-y bazqj(8ns5z -2* a49wipzpbzj1 graph for the motion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that the car starts atjq2- * 91pia- z4 zs85ujyw( wbzpnzba 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 trackftm)*rq8 r- dy is shown in the diagram. The thick line)tdyfrrm *8q- 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 given by the position vs. ti.r0ml8jx wm ,)foga1nnx/ 5c 5c 9idsjme graph shown. For what time(s) is the speed of the obj0njmdccxign,15o/fj r )wm9 8xa.s5lect 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 byon1co00 +k upnix1nlj+oy3og p db8 y dqc08;. the velocity vs. time graph shown. For which time(s) is the acceleration of the object equal dpndyxkijyg 1p+3u 1c;8.0oo + o nn0b8lco0qto 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 i*p1gxlhkcd0yi8 7- ftime interval of an object’s motion, whx0gk17 iy cdl*8f ihp-at quantity has been determined for that object?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.08: An object moves along a horizontal line with ine*h sxw2.( d m.5m ajwj)yfvo1creasing 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 parhhl 4 84dto 9m/0xkkhpts:
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 rn t5c2qe0dl9bw d/.9ux xb :neest 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 v8ndr u)umf0benztw.w .b,3q91kk - e $2.50\;s$. 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 z(vh8 utw )8 j(fj8 hc7nk8tkhfd(r4 ugraph of a particle moving along a horizontal axis is shown. What is the total distance (ut (u7nwcrhz d8jf 84 )hkhk(fvj88 ttraveled 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 of the listedwl2,/kyx agitts4i e3dz+sl+xz79 5j situations for whikls ,7x2ix4l 3d5e/asjt y+9+z wi zgtch 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 objeyx*x;asny(ua 8(* ez qct moving along a line is shown. The object starts from rest atu yxxze*8*sqyaa; n( ( 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 starts at the origin and its velocity along ayjtj;t j8,x3iw)h fe+lu 5xbt5/a6mi line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of 3uxt5 +fa i8 yjtjbt5mwi,x)l6;/je htime 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 m.i +m8q4l ldyvoving to the right on a horizontal track, each with constant acceleration. iv8l+d4 yqml. 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 posit;-w w3c odbn 0mbw9d6dion $x$, 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 ,uo ie913 rubnin the graph, which one of the following choices correctly describes the relation 1nr9i,o 3ubueship 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 descrik,fweok2nee0b6 xk e 2*(x; yh0no41.ey shlpbes the instants of time, at which the car and tr n6xy 00yo21 oep4f*kelh k;n2(.hxs,b ewekeuck 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 stc kho07 1bomgc xx4))tart from rest at the origin and will move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the f )gcc)h bokxmo 417t0xollowing 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 bs)uj 4i/vw uryv1o 4-object moving on a horizontal line is shown. At what time(s) is the object moving with its gr4 -wrvy/i uu4vo)1sj beatest 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 follow8zapyd-(* jy5 2grmhs4g lw/fing the position vs. time graph provided. During yz ag2fl-my* pd4g(r5shw/8 jwhat time interval(s) does the mass have zero acceleration?


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总分:72分 及格:43.2分 时间:不限时
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