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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 at a constaz 2 m tchopqix/a2/;-lnt 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 e*j w m-myo1; dggb5+vto a particular direction is calledm+ybe;gjo* v5 1 dwgm-

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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 lakew5dvz 85iz 3bwlw*i a c++q-(k3bdap around a circular track at an average speed of 50 m/s and then completes a second lap at an average wkd(3 iz5b5vb +3kwie8zw*c+l- adaq 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.9ukzk 1zt*1 hx If it continues, how far will it travel in 3.0 s?1hk9x z* 1tzku

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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 stationar. uvlp2hym(kmhu n8d 1w/1g)we2 pc*jsu0 k*dy on a 30-kg plank that is sliding at 5.00 m/s to the right across a frictionless pond. The boy thlcphg*ww ks)uud801v nk.dpm( jh eu2 2*m1y/en 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 and 400 km at 100 km/h. Wh:gb( ot+*f a/x kle su*wwya8)at is the average speed of the motoristub/wa xefsaoyw +:)tlg* *(8k 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 ref0zp)yxi qjmr0rk8 u/. ers to the motion of a toy car traveling along the x-axis. The graph shown below is a plot ) 0mzxuqp8 jk/.r0yir 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 u qkjxafbp 91:d0*m: btoy car traveling along the x-axifuxj:d0p1 b *:ma b9kqs. The graph shown below is a plot of the car’s velocity in the x direction, $v_x$ versus time $t$.What was the acceleration at 33 s?


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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.22: This question refers to the motion of a *bxakzgrsn- 2-y2le, toy car traveling along the x-axis. The graph sr lk xngy *as2z,-2eb-hown 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 velocity vs. time of a duck fly-cr0mmd xy 28v; z1vd xb-o25w z8glwhing due south for the winter. At what point did the duck stox 0l z2m bm -25;dyd-rzwxhw8 v1vcg8op 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 diagrqt2: x5rdl-h4dgde . pam below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the average vel.:h-rdx 4gle 52qtdpdocity 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 tc b coimj: -(zcq7:0xzhe position and elapsed time of a car startincx0 (cjmb7 -zoz: cq:ig 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 , ol +h9q ,hvxwq)w*kcvelocity time graph for an object with the position time graph shown in the diagra *kw9q+vq,h,c xol)hwm 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 followi 0;yxoi4 ;yek)zq,efo ng information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and reboun k oe;ye,4fi0zq)x o;yds 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 toj;g yy +lj6g :-kj3nqe the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and reboung:jj6n 3;j-elg + kyyqds 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 hj;8o l 5 qlytz/2yb3ba 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 referjf/uhwfeqv1 : )d8if;s to the following scenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
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 ref1x 4u( *t x/v:soxozggers to the following scenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
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 followp 2d 7 d4o56umz8b/uzuusg rm4ing 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 tw f,/xneqx,tx: /dk8 zo 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.
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 tableb v)i4jxt6h0 h )kfl2a top and off the table edge. Which of the foh bj) 4v26a l0kih)xftllowing would best represent a graph of the magnitude of the ball's acceleration vs time?


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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.01: The graph represents the relationship between 1m7+9 su53pcbkuiag jk *yy c4distance and time for an object that is moving along a straight line. What is the instapcsa3uyu i1759 gc+my4* kb jkntaneous 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 tswfo+ -ww w 057hdw4hphe relationship between distance and time for an object thsh4+d7h w p w0-wfwow5at is 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 stfk mf(h*)qt .praight 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 speed of the object whenmhk*t.pf )q( f 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 7p:j .bo2cplirepresents a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start j7io .pp:blc2 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 uniformly a2(v; xtyrz,,ks* ormv ccelerating across the floor. The time and distamosr2 zkr v ,vx;,t(*ynce 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 toy car starting from rest and uniform (yskhrruh*nx *6. d.7i+ d;jsyk -iskly accelerating across the floor. The time and distance traveled from the start are shown yr.d.n*-yi *hi; hd+x(skks7 s6uk rjin 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 q0q+,ap d0cr/fiby5q accelerating ball. The position of the ball each +b50rac,iydqq0/f p q second 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 b6-i+ :i jbnwng4k yt/a uniformly accelerating ball. The position of the ball each sen: ikbjwy-6 bg+ int/4cond 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 0.ypx*. tep lgzmj*yh0 8bl 1aline is shown in thh*8 ty* ple m1x0zyb.l g.a0pje 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 o h; yykcf38awc;qm1m0n a unicycle moving in a straight line is shown in30a h1kfq;ycmycm 8;w 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 fr w7dsd5scv00qeely 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 marvxx hym*mjq 3k*987mrkdf* )mble on a table top for 10 seconds. For which time interval(svm *8jm*kyq) x *mx9k r7fdh3m) 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 ah iymeamo *4 8g 5vb07js ozqo.t+(,za marble on a table top for 10 seconds. For which time interval(s) did the marblm7m .h58o4+,o oz0zvijy(aa s q* ebgte 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 motio .n,aupxe n(f1eem01sn of a marble on a table top for 10 seconds. What is the marbles average acceleration between t =u1e.naxe( 0 fme1sn,p 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 unif()wqd,m qnqp:--i h cformly 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 spemu .2rqn,0lpxio-r83 om2o pbed of $20.0\;m/s$, takes $2.00\;s$ to reach the ground below. From what height above the ground was the object thrown? Ignore air resistance.

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.03: Which of the following graphs could correctly represent the motion ohqa6g *+m qx:ff an object moving with a cons:f hxqg*a 6q+mtant 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 across th,p7n(y zq3dpl e floor for 10 secondsn,qd pyl p7z(3. What is the 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 accompanyi*e3swzd ghe86 ng graph describes the motion of a toy car across the floor for 10 seconds. What was the total displacement of dh*s6g3ez 8wethe 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 87zjhod/ rtwzjqp+t5itk o,041 gqn* describes the motion of a toy car across the floor for 10 seconds. At what times or time inte*wdi tjtjp8q0o+5 q4gt7,z z1n/khro rvals 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 kmfra(8 eei4 4j*5 vl-wdns 692zysaiwi/hr in 4.50 s. Which one of the following ch9fa wsvz i5l-e6r(8wnis4j iy4a e2 d*oices 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 versu64jok a6pcs)zlls d(3+ ug hg5s time curve shown. Which of the following statements regarding its motion is NOT CORRj6gz3c l ug5op6h(dsa)s+l 4kECT?


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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-- wu1sws(xxdk1ykla1d i8f. time curve shown to the right. When does t1i8xs1d f yk1d xuws-ka- (l.whe 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 timbe-rhd *8 :h2dy ztaqi0:-icse, 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 8hz e:-ic*bq2d-h rd:syt ia0is 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 tri.zot 53l1;k xvsgj5ai/ mt:daveling toward each other.tvxti/3 1ls kjg:5a5mi.oz ;d
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 6u5jt:cq*jy7o v( rfw 0o*yuq positive and incrr *tcu:y6*uy7j wvqjof (o50q easing

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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 aveq q2hd(z wly9e;.jyrkz3(: 9d.euuc nrage 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 dimensions, which one of the:f*xgq76 bl i0,hzwua following choices identifies quantities that must have the same dirul: f,6x*zihagbq 7 w0ection?

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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 mov 6h2q93hpm/0fk0e aqkbe dho4 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-timee7g6ymi.1 b2c xf;lih4ucz0* xej; c a, $y\;vs\;t$, 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 forwrlj36t-zcts+ 0g s:e total time T in ttjg:6+3ews 0ztrl s-c wo 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. tih8i wbsvx alcfjz)2m6ls:+ /7me 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 2ssx f:zl6hi+8/amlw 7v cj )bcar 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.ii 9i(u;:voq7 ,as-z60y,t jewuwla y time graph for the motion of a car on a straight track is shown in the diagram. The thick line representol-i (q 9es ;wjviz: ut,a 6au,yi70wys 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 msj;c7osfcp7z . 2xlh (iy0z :motion of an object given by the position vs. time graph shown. For what time(s) is the speed of the o;cssym(l.h2x :zf7i p joc7 z0bject 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 tejhjdh 3v96q3 he velocity vs. time graph shown. For which time(s) is the acceleration of the object equaljh 33v6q ehdj9 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 tryl3 (hwl-tivu +0vi 8 1jrmt*(5eecghe area under the acceleration vs. time graph for a fixed time interval of an object’s motion, what quantity has been dete0vulr5 -g8v3 ryiht1+icm((wljt *ee rmined 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 5eeq pesr6tmb,,ii4:a horizontal line with increasing speed.
choices could represent the signs of the velocity and of the acceleration for the object to achieve this motion?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.14: A car makes a trip in two partsy/f;r3dyilc8 -kk: ix:
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 in a timy /5k6 lzy etmtfl218ae 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 reox e.0 yiiz+72:r5 vd or+lmwlaches 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. time g-uou nn:+ nbtp mj n639dn7v8braph of a particle moving along a horizontal axis is shown. What is the total distance trnuj n :ubtp+n6n o -8v3mb7n9daveled 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 mhjib+flg q3z 1,z8 m2of the listed+ l23ihzj 8z1,mbq mgf situations for which there is a non-zero acceleration?
Situation I : A point object moves in a straight line with increasing speed.
Situation II : A point object moves in a circular path with constant speed.
Situation III: A point objects moves in a circular path with decreasing speed.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.32: An acceleration vs. time graph for an object moving along a line ia. u0ix41 9csg:nin(whf r,rkotq w9 5s shown. The object gcw,9i4 5kxrw9 ohn fns0r i1(:a.qutstarts 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 starts at the i.crywqrc216 ue l.d6hd-zy 1origin and its velocity along a line vs. time is graphed. Which one of the following choices bec 6hqyui1ddr 2rwl. c y6ez.-1st 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 77ynb68b9qsnf 8uy) zriy 4-tar/ gza, each with constant acceleration. At an instant of time, the it9u)77r-/f z88 bbs6zy yna yiq4g rnanformation 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 positg/.fa)fso ;y+ pv2rxvion $x$, 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 one of the followillleslx8, 4l*b1nm 7mng choices correctly describes the relatio l*le 17,m8llxsl4bmn nship 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 olxmice:/k .td+;1lenp (* iwbest describes the instants of time, at which the car and truck tr.cd*l:i+ ek (/1ilexm otnpw; avel 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 staljktp/y 50-ls:3ypyi rt 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 correctly identifies t-ylp /klt3: p0yis5yjhe 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-vp6/e( x q:w*hh7uvop mrcv/uh 1ci3 line is shown. At what time(s) is the object moving with its greatest speed?r1 oe3v: uu(i hc/7*-hhp pxcwmv 6/qv


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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 6u8*e xzsur4i ov,7l ualong the x-axis following the position vs. time graph provided. During what time interval(s) does tsv7*i8u64uu ezlx ro,he mass have zero acceleration?


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