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习题练习:Physics Bowl by Topic 2: Kinematics - part I General Motion



 作者: admin   总分: 72分  得分: _____________

答题人: 匿名未登录  开始时间: 24年03月31日 09:50  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.10: A particle travels atl abatx:je)w6 0vi eir;-7xa) a constant speed around a circular path of radius $R$, if the particle makes one complete trip around the entire circle, what is the magnitude of the displacement for this trip?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.01: The change of distance per unit time without reference to a pal83xoiv:w,bf8l t*n nkx(tl3rticular directiotn:3iotb3wx 8v, 8lk( nx*f lln 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+j 9embub zy6 4n pf-rl8h3 q5 ofm8yrn15ug-i lap around a circular track at an average speed of 50 m/s and then completes a second lap aym+fugb6u hmy5of5 qinrpbr48z-j n39 l-18et 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 1.0xzu m a5wr1qr;11e 3jv s at the constant velocity. If it continues, how fxea uq 1rj3w;51r1vmz ar will it travel in 3.0 s?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  05.34: A 40-kg boy is stationary on a 30-kg plank that is slidiy*s gyzj 8/pw.ng at 5.00 m/s to the right across a frictionless /.*8gyzsjwy p 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 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 a2yx9bsq 5 gwmjz,05xf nd 400 km at 100 km/h. What is the average speed of the moto0,j9q g x5x wsf2bz5ymrist 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 s-s 8c tzszw:4motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s vels:84 wt- scszzocity 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 z5a w m-uo,ca ;n 2fydi;zk03pof a toy car traveling along the x-axis. The graph shown below is a plot omf5 3do zy;kzu0n;a wc-p 2,aif the car’s velocity in the x direction, $v_x$ versus time $t$.What was the acceleration at 33 s?


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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.22: This question refers to the motion of a toy car tray t0)jhc+l-; icm aq.wveling along the x-axis. The grj;cqth yi-w ca0+) .lmaph shown below is a plot of the 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 ve7.myaut xcx)i1yu mt3iaf0py06n, 0j locity vs. time of a duck flying due south for the winter a).0mm7p f0 uitaitxn , cyy1y6u03jx. 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 refer to the diagram below which shows the position and elb5y7 ol8czc zb/l 86kiapsed time of a car starting from rest and uniformly accelerating in a s8lib/l8z zkby 5o7cc6traight 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 blvw9t;4 kd rx52+eyvgelow which shows the position and elapsed time of a car startin;de4r9wtv +5 lgx v2kyg 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 graph9kz e+ 7os,ruh for an object with the position time gr 7zk,s 9h+rueoaph 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 followino5 b;/-v1 ;wk duaoae-vl ix:hg information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to ki/du-a ;5 lobhex o-1vaw;:vits 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 information. An i+p(,y5 cikkvl arh-: ideal elastic yvak 5c( +li:pkh,-i rrubber 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 l4w e - yx093wr7l)dj 4bmbqoxtravel with a speed of $v$ in still water, which of the following trips will take the least amount of time.

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.01: The question refers to the fol+k1bw/*cdr y7gd .c zvlowing 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 scennch kr d)z9xcun;**6xpl*o4vario: 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 scenariomago*)c y1n 9zq1e- kn: 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 gd4c9 ,al0fq hfollowing 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 b; hg 8rcm m(nxq e(80wr7de*va horizontal table top and off the table edge. Which of the following would best represent m0e;dn ( cbq87e h8m*vwgrxr( 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 rel lb:lqt34r+kz ationship between distance and time for an object that is mob4r+ zklq lt:3ving along a 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 represents the relationship between distanv -j 7udulpcti.:2f1 fce and time for an object that is moving along a straight line. Between w.2u7 futc1idj:pv - flhat times did the object have a non-zero acceleration?


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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.07: A small object is thrown straight downward on Earth with an initiax sr:j+bummx2 (bpif5 / js2o9l speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resistance, the speed of the object when ipomf/ (5msjxbx jb :29iru+s2t 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 ca*snosw ,h5kg4y+jlv;sx y 6(ixna;*m r starting from rest and uniformly accelerssm+5nn *(swa hlxgx, jy o;k ;yi4v*6ating 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 toy car starting from rest and un::lxw v s1)x 4d,bnjqxiformly accelerating acr vwb4xjdx )x:n:,l 1sqoss 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 belob93,u n,bcq cow represents a toy car starting from rest and uniformly accelerating 3c ,,oq9 bnbcuacross the 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 unif;8m sqprv4o qt.*ydu2ormly accelerating ball. The position of the ball each second is indicauq vsdop 4*y.82qmtr ;ted.
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 un b9v u28 fh doftvup-)/z)qe0niformly accelerating ball. The position of the ball each second iev)9 un)ft b80 f-dz/2hv puqos 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 unicxo324m0qi8 n 3rkozbcu(6z tjycle moving in a straight line is shown 6 8ir coujtb23z kqn3zo40(m xin 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 a unicycle moving in a straight line 1u y8kn 4wm 4ae)f+vjuis shown in the grapha j v4nyw8u)1+kmu ef4 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 freelytjga cc:fi+1nul ,(d2 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 graph describes the motion of a marblegh w (h;r(g2u5 cnsx:c on a table top for 10 seconds. For which time interval(s) did the marble have a negative v5(n ;hwr(xchgsg:c2 uelocity?


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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 motpmh6:8idvaw p,0 ;n rsion of a marble on a table top for 10 seconds. For which time interval(s) did the marble have a positive acceleration8hwda60; nsip p m,r:v?


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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 gwb,t9f /jt8qhw d1j b:raph describes the motion of a marble on a table top for 10 seconds. What is the marbles average acceleration beth8j:t,w9q j1df bw/tb ween 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 nu33dc.0rhw u r/xpx4uniformly from rest for a time of $2.00\;s$ through a distance of $4.00\;m$. What was the acceleration of the car?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.06: An object, thrown straight downward with a speed of b9y -o,uy/pk0 fvizi -krri; .$20.0\;m/s$, 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 motion of anvx qki7q4z3(52ru4;2 )p dcyk kevf kt object moving with a co;23ykev27k5cqkr4 x4)pduvtq zfi( k nstant speed in a straight line?


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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.24:The accompanying graph describes the motion of a toy car acrosxsys hhi/ (rpuo1 +; pmvg+r80s the floor for 10 seconds. What is the acceleration of the tos1; sgv+r/xy8h(m ih0upr+poy 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 describes the moti 3m.gf1zwh+ wk rf0)fmon of a toy car across the floor fo r+fgm. )fw1hw30fz mkr 10 seconds. What was the total 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 mesc 7f 704s jec8u/vqdr8bt0the motion of a toy car across the floor for 10 seconds. At what times or time intervals must the net force on the toy c0 v 8eqdr80b fs4s7uj mecc/t7ar 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 accelerat/mhns) 1u;;ug parrvqg6i1p7es uniformly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best represents the acc1; hnr );upq 1i/uapmrg7g6vseleration 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 ths*7e ,aflk5yse following statements regarding its motion is NOT CORRECT?ys7,e* flak 5s


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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 accoehpes;k-r5uzx(4 +xg rding to the velocity versus time curve shown to the right. Wxhp -se4z(kue ;g5xr+hen 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/lqtdka tb qu9(+ ,r0b the angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement it0+klbu( r9q q adbt,/s 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 15e i;z/9oc.oo.kkc ef -0 kilometers apart and traveling toward each other.zf-c9i .;k kooc /.eeo
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 is6fa.7l tj8 roeys w5 /vhf7o/v positive and increas8/l5yhovj /re7ft.a7vfsw6 oing

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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 velocity :4 qay s(i*tfxis

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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 on5k4 oaf;f,t ype of the following choices identifies quantities that must have thetay4o,f 5kp;f 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 movesubso1j g49op:a u6 nb/ $3.0\;m$ 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-t( g;10ho gfxavime, $y\;vs\;t$, 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 t oztgudz ak;7 o-z;qx0(wv9 0zo the right along a one-dimensional track for total time T igu0txv zzz;( kz7-od 09q owa;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 graph for the motion of a car on a straight tracke 5obq jf0dyu6;u6yh ( is shown in the diagram. The thick line represents the u j56 bdo huqf(y;ye06velocity. 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. nqyq4lmj9 :ms/gx7(r time graph for the motion of a car on a straight track is sq:j7s4lyg nqrxm(m/ 9hown 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 motiyk7nqac v(4f*( //dw qpjfq8 r4tbqu0on of an object given by the position vs. time graph shown. For what time(s) is the speed of the oya qf0/ftpq8(cq4u*dw/ 7bvr q(4jnkbject 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 velocity vs. time graph sh: n.rd )u+5tcr 7 ww;q4entuawown. For which time(s) is the acceleration of the object equurr7 ud tqwn)4cw.t5we :na+;al 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.u9l3zs xkyk 8/gfj5m/ time graph for a fixed time interval of an object’s motion, what quksx kf9 5mz8ly3// jugantity 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 increasing spee jadp d; e1/spv2t/pl-d.
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 pa7su3 3ft 4 el 48ymqkx,c0rzwarts:
Part 1: it travels a distance of 800 m at a constant speed of 4.0 m/s.
Part 2: it travels a distance of 1200 m at a constant speed of 20.0 m/s.
What is the average speed of the car for the entire two-part trip?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.02:A small object is released from rest and reaches the ground ikfnr3w a/:;xo n 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 +6sbao:7ckp2u bsf6aa ry*. gtime 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 pam(q6k 3swal2jrticle moving along a horizontal axis is shown. What is the total distance traveles k 36mwjlqa(2d 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 +9 w9i9lo3we dujwttg077uhwlisted situation7wt7g0edu99 o 3jwl ww thi9+us 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 object moving alongjpv.7 -/go .rb wvgl0dck: 2cx a line is shown. The object starts from rest at time t=0 s.2dgov b:/cjlc0w xv 7.p.kgr- 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 gkjc4z al 5l9*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) o4j5*a9g l kclzf 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 on a horizontal track, 3foz+5tkaicz)kcept2s y* .y+vq/ y* each with constant acceleration. At an instant of time, the information about th/zt avq*f .cyi+)ek5y pz o2*sy +ct3ke 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 sg2-ekzqtu9y 2ba(qlkq6.: u a 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 ti7j18 -b4 3frlcmc.ticdmt q( djah .s;me shown in the graph, which one of the following choices correclbtm7cj4- jqc ;r1(csa.md f8.d i3thtly describes the relationship between the average speed of the truck to that of the car?


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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.42: Which one of the following choices best descrw+:o tm 9zyt/gkvj:p.t): fhxu h+ qg4ibes the instants of time, at wg:) o+fy9tkj:4/ xvtg:hph+mt z uq w.hich the 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 and9/(0,jptk d bh q fcn7lrj1e5m Q, each start 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 following choices correctlj k(ql 0,cn7erj5 dh19b/tfmpy 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 horizontal line xr8r08kwy)dngj28wq-yy s g7 is shown. A s gny k728ry8w)8qjr -yd0wxgt 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 the x-axis followiz/b.,i)g06 h f lzjemima(2mfng the position vs. time graph provided. During what time interval(s) doef ai0m zfm jz6m/e2bg)il.h( ,s the mass have zero acceleration?


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