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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 coe jp. fa7f;0cfnstant 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 tnob1ea +t4u 7vime without reference to a particular direction is c ao+7evut n1b4alled

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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 comp. /eyqi)*9)dz zvkrap letes one lap around a circular track at an average speed of 50 m/s and then completes a secapv.)i )z k*e rz9/qdyond lap at an average speed of $V$. The average speed of the vehicle for the completion of both laps was 80 m/s. What was the average speed $V$ of the second lap?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  95.03: A toy car moves 0.80 m xgl*xm0-j h9l in 1.0 s at the constant velocity. If it continues, how far wilm l*0-xgj9 lhxl 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 slidinv1ddrr ;v.uc- g at 5.00 m/s to the right across a frictionless pond. The boy then turns andv1rcudd;v r -. 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 travebj -ar nr;f 5i(az8/plls 400 km at 80 km/h and 400 km at 100 km/h. What is the aver8/z(p fb lrr;jin5-aaage speed of the 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 to the motion seczviz,s+x ),6ot/ jg mr;,xof a toy car traveling along the x-axis. The graph shown below is a plot of the car’sr+)x,;vo/ ex zz,tsgij6 cm,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 cfvhr:7vj t )i/ar traveling along the x-axis. The graph shown below is a pf7tj: v /r)ihvlot 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 refers to the motion of a toxay2+b7s1uu 7 bbkzw:y car traveling along the x-axis. The graph shown below is a pl sbza :ub7 +xb71k2ywuot 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 velocity vs. time of a duck f tx/q-)x 7g p-;bdqxbxlying due south for the winter. At what point didxbx /;bqd-g 7q- xxp)t 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 refernwsdspbw8(csq9-dy15m3 ti0 /gdhh4 to the diagram below which shows the position and elapsed time of a car starting from rest and uniformly ayds8 c9ghb-3pwdhm/ iws tqn(041d 5 sccelerating 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 below which shows the position an :.hcd6sw*t hcd elapsed time of a car starting from rest and uniformly accelerating in awshcctd*. h6: 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 an objecesz p)og *6:namsa o)ro 0i3c8t with the position time graph )oi:ceg) sa3mpno 6a s8 *oz0rshown 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 inforgdlva8eqjkfyx+20:m1y+8 e tmation. An ideal elastic ry 8q0ekg8+:1 ylat evdj2xmf +ubber 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 the follow7ez obn1+fh e:ing information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hitsz1 efh:oen+b7 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 bt 9f:j;hwvb3speed 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 tr1c ge+i)tz c1h+1zypo the following scenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
During which time interval would cars #2 and #3 be moving at the same average speed?


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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.02: The question refers to the following scenario: At33ngj sjvr7- qjy 1y*r $t_0$, 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 the9qm*c2 vazosg7j (kh2jr2 9lf 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 following scenario: At w7 igjkb k)erf)39 l:dqb6s y6$t_0$, 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 tuko x5nh, 8o5dib2+2qa . znfzable top and off the table edge. Which of the following would best represent a graph of the magnitude of the ball's accelerq82odf.on5h2z+,za 5iku bxn ation 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 di yae,xx1z7sq0stance and time for an object that is moving along a straight line. What is the instantaneous speed of the object at t = 5.0 secondax7 x ,zqsye01s?


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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 betweevita5/4+uho dty - 4m5rrme oe5w)gn5n distance and time for an object that is moving along a straight line. Between what times did the object have a not55 m ritm ruy/wveoh45on4eg 5a+ -d)n-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 onc-/i.u7j svty7is i*n Earth with an initial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resistance, the speed of the object when it reaches the grcv- yiss7*iu.n jit/7ound is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.11: The diagram below represents a toy car starting from rest and uniw7bjdrjd 5, h) f:3pzdnlw0l8j9 xdt6formly accelerating across the floor. The time and distance traveled from the start are shown in tjjtwhl7:nwdd rb,9jd580 pz3 f6xld)he 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 caru8qsq7w btqkj xs+ 0-2.;behh starting from rest and uniformly accelerating across the floor.;q+.s80bthq seqkbxh- 2 j7uw 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 represen. drn (int83ebts a toy car starting from rest and uniformly accelerati8t3r(nnid. b eng across 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 uniformly o sny0-kf:d6-u d6qo x+y1 dvvaccelerating ball. The position of the ball each se -:6vns6kodfd10dx vo- q y+yucond is indicated.
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 positio5g,7* +wzmsaovaxx l-n of the ball each second is indicatv*g l+o,xxwma57z sa -ed.
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 unicy,oboge6 p uyz9iu4 61e -7ejpywep.y-cle moving in a straight line is showpe41 yuyp wo6zp, .yigboe6e -79e u-jn in 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+q-56z fwgnk l straight line is slkgn-+ q zf56whown 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 near the surface of the eaah+htyb(2: ;nl g0x3itc3 c larth

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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 marbl v fn-u:g:r 6k8ppg:t; )vyteme on a table top for 10 y:pkrtvge::p6n vtf)8g - u ;mseconds. For which 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 orhgr:n /mr lnn 6i(b)z 5;pzijpm( b42f a marble on a table top for 10 seconds. For whl5m:r/n ;zpgb( 2n mz6br rjpii(4n h)ich 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 r u8afh24 qf,kx6y/b6 crfr5ygraph describes the motion of a marble on a table top for 10 seconds. What is t q cfarrf 24r5 xh6yy6f,kbu8/he 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 from rest fiaq7b1:+vev ) ;s szdxz hmx20or 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 down8s bym4p/ ;8ddce *5swcy nx0dward 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 follorxef vwi(*a* 6cugx/) wing graphs could correctly represent the motion of an object moving with a constant speed in a straightix/ xgf aw6)v*r euc(* 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. fsv)cl i;qc) car across the floor for 10 seconds. What is the acfi. ;v )l)qcscceleration of the toy car at t = 4 s?


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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.25:The accompanying graph describes the motion of a toy car across u06ibc0fr 0) mdlxh/ithe floor for 10 seconds. What was the total displacement of the toy car for the entire 0 l6)xmr0u0fihibd/c 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 motioc(p-/u h0ykv 9la;jwgn of a toy car across the floor for 10 seconds. At what times or time intervals must the net force on the toy w 0cuv -lj/y;9(hakgpcar 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 unifo(t;i:sa 03 kwrbu9 hmlwjq5o- j ecq,3rmly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the followin ,qc- st 3jm kw:u5jaw9or3lb0q i;e(hg 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 velocity versus tsfvj1no1 rrnhcz/ gf 4.ne5bfw;80l ;ime curve shown. Which of the following statements regardingrz .1n1j5fgesb/ v;lof w4fc0hnr8; n 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 according to the velocity versus time.1bem *)rr *1j:c w4xkne ojch curve shown to bexmcj1n *ecjo *)w.:rk h41r the right. When does the car have zero acceleration?


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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.22: During an interval of time, a tennis ball is moved so that the f*)i:z-ke pk3k1,cqty3i ovl)xx m1iangle between the velocity and the acceleration of th)yi okp ek1), 3l: 1q-kmxtfi3i*zx cve 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 s z 3tg) g0dw8n t(,+9qtmuotaeach other.qttt3 9 z,a8wdg0nut (sg)+m o
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 o 0 6vlhn yq .;,0ewu(hq5+wcou-electhe x-axis. When the acceleration is positive and increowv oq ;nue(we 6ll h-ue.05cc0 ,qh+yasing

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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 ve/ p p)lcj-:r:p2 eg ,a8.bhxfbp 1quyblocity 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 choicest2 2tz3oq uyy. identifies quantities t.q32t oyt2 yzuhat must 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 movewl (j( h l 1ejq;r-z1la /bf(cosxm4f-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-timo e50 awh6g qhxfk.7 q9 qnvc;.j:s7ire, $y\;vs\;t$, 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 alp;)y;2bf(cjhduq1vnz z pc8 x+ds)x ;ong a one-dimensional track for total time T in two parts.dv; ;x 2u8zy(h+nq;xcs pj1bf))dczp
• 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 v(:xg17ts jmolv-n, uof a car on a straight track is shown in the diagram. The thick linejn, (1 7sgouxt-mvl: v 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. time0jubb4,h ,vd 4eny4ri lc*l k6 graph for the motion of a car on a straight track is shown in the kr*b jl 0cye,vd4l4hb,niu64 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 w.c),jk9p3bl l*a:yzuv 8j6zpe7sjn object given by the position vs. time graph shown. zyp j3s*pen a8.7z)u:lwjv, kb c l9j6For what time(s) is the speed of the object greatest?


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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.11: Consider the motion of an object given by the velo 6z 0d7u:llvs)p rm-hzcity vs. time graph shown. For which time(s) is the acceleration of t 7z:ldm6z)psr0 hvl-uhe 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 acceleratf7 m9q1e qx1awzkx0 2iion vs. time graph for a fixed time interval of an object’s 92 kxfeq01wi17mqazx motion, what quantity has been determined for that object?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.08: An object moves along a9 z*z;nz : clrus.k:cy 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 acfud4 p4 f+)fp trip 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 0v a fsbrfhvy :.n,;q,kmpz*:is released 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 s1 f0g/iv4jw afrom rest and reaches the ground in a time of $2.50\;s$. Neglect air resistance. From what height above the ground was the object released?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.17: A position vs. tis) l uxiom e12g/(2zwzk gn.,sme graph of a particle moving along a horizontal axis is shown. What is tz/glm)nsg2o1 ue.2 ik (sxw,zhe 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-g/l k 5ga6u riom/*une following choices correctly identifies all of the listed situations for which there is a nng ruok//li*aug6-5mon-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 along ahaa9/ cmhqq7.un96go line is shown. The object starts from rest at time t=0 s. At what time(s) does the object attain a maximum displa97homn.qa 6/q hu 9gcacement 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 star6 +te54re(ug tgi4)oxjr uw4cts at the origin and its velocity along a line vs. time is graphed. Which one of the following ch464e5)(xw t 4ejrigt gcuo+r uoices best gives the proper interval(s) of time for which the object is moving away from the origin?


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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.09: Two cars are moving to the right on a horizontal track, each with cpky* ghk8tamtbx5l35s(z* 4* 9nny xe onstant acceleration. At an instant of time, the information about the cpx9gzk t8 *(5ams3xkn*bn4yty eh l5* ars 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 aiqdl mim-c.;; 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 the graph, which o1 0hcfy,znerc g-wv88 ne of the following choices correctly de8nf0rce cvy1w ,z8-ghscribes the relationship between the average speed of the truck to that of the car?


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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.42: Which one of the following choices best describes the instants o11 (k5vq; yoga2 cicp hlro; eg1fal/;f time, at which the car and truck travel with the vgol f;2l1/(poa1cchki5; ;g1qr yaesame 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 at the origie7 8pso kc6y 9s7bd(umqp+:xun and will move along the x-axis. The acceleration vs. time graphqmu po( 7s79 8k6 d+xucybep:s 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 vs. time graph of 8 p*/v5q v g )r ooqhvm4mun*r.8ng0tban object moving on a horizontal line is shown. At what time(s) i0rpg5h * 8n.tm)uqo*mb grvv 8v4o/nqs 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 position vs. time graph p3aab5ys z bmnm5j1 4 v(wtg0-wrovided. During what time interval(s) does the mass have zero acgw y4ba0v t5zs3wn1-5bm(mj a celeration?


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