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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 k(j) sm9 2iktnconstant 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 p.-:tye6c ktwaait. k 3 ezs2w:er unit time without reference to a particular directiow.ae-s i2:e k:za3t6tkt wc. yn 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 comp ycrj,:gw o/k)letes one lap around a circular track at an average speed of 50 m/s any,/ gwc jro:)kd then completes a second 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 ;(pxdp0 kxcr ihot3u5 x,,tv*m in 1.0 s at the constant velocity. If it continues, hxh(xt d;, ox5ti uvkp, p0r3*cow far 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 a6:r)3 t qxgzpj27mg.kn4jd bh 30-kg plank that is sliding at 5.00 m/s to the right across a frictionless pond. The boy then tur pn.7b4zkqhx : m3jd jrgg2)t6ns 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 r we zgfaz+ag98g cd59k.2ls580 km/h and 400 km at 100 km/h. What is the average speed of the motorisg5gw8+ eld.fc2za5z9ak 9r gst 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 of a toy car traveling along the .2 qstvjv6e lx9+ (lqzx-axis. The graph shown bz.vsq l+6tex92j lq( velow is a plot of the car’s velocity in the x direction, $v_x$ versus time $t$.
During what time interval was the car moving towards its initial position at constant velocity?


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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.21: This question refers to the motion of a toy cjn.4 jd.jtuu 49v6 rosar traveling along the x-axis. The graph shown below is a 9nv ud4jro..s u4jj6tplot 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 toy car traveling along the x- q4jv8;k aeu*zv;wrgoz/ a. 9raxis. The graph shown below is a plot of the car’s veloce/urz; jva8o;kwaqrv*4. z g9ity 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 flying due sou)ha6t ;lbi27b h *q, mstnb5outh for the winter. At what point did the duck stop its for7qih ;ostb, btu2nhl)*mba 6 5ward 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 whihr.q g oeycrsi03g/:x2y ;e:ich shows the position and elapsed oc/xq:g0e.igrey s2 hy 3ri;:time of a car starting from rest and uniformly 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+1:;h7nhio+ 5ov .vbvpj zujc,*xppz the diagram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average xo1.; +pi,+*pupzzbj h v:ch5vvo7jn 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 giljbfcn5j,m+:t; i ;zraph for an object with the position time graph shown in tfn5 ; ijjcibzt:,m+ ;lhe 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 top ,4sfni pp0 .8y/jysjk9yi9qc huc :+ the following information. An ideal elastic rubb,/f.ncquys 9i ppp: s+j4y hijkyc 809er 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 a8ni3,doyr b vs o2 69j0e/gshrefer to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebas02j 8 vo6i3byo ne9srd,/ghounds 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 speed of *;d 0p.0gsl/ fyp lrcv$v$ 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 following scgib)h p( 9 tgg u1j29v6fk4e*q)zskftenario: 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 followingth+f j: :(cf4 1gs13pp8zuwmn /lezyc 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 fw /fdu+ (kr3 zah)y2yhollowing 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 thv rx -jch.4b)j y0ro:bfh/lq3e 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 table top and off the;x5 6b,i5t cgwir4 huf table edge. Which of the following would best rer xitgh5;uwc4,56ib f present 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 gu/lz/zevl :9ationship between distance and time for an object that is moving along a straightzeuz9:lgl /v / 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 distancew;wjfuv g53 8l and time for an object that is moving along a straight line. Between what times did the object have a non-zero accelef8gwv jw;3l5 uration?


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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 wit;kf:cynhq2- 1 k1 qniah an initial speed of 12.0 m/s from a position 10.0 m above the ni:-2qy1 qfan kckh; 1ground. 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 a toy car sti;e *5v+puhruarting from rest and uniformly a5r*;uepv+u ihccelerating 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 :mh/ b .k)getzuniformly accelerating across the floor. The time and distance traveled from:ek/ hb)zgt.m 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 au:gcm4x /xc8mnf7 q2 and uniformly accelerating across the floor. The time anqfagm2x7x4/:c 8 unc md 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 unifoye dbhs1k*g9gc6 5 qxh(cua 80rmly accelerating ball. The position of the ball ug(6s9geyk*xa0bqch1d c85 heach 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 a uniformly 4-u +jo8xqp2ebf t0epaccelerating ball. The position of the ball each second is ind fe84p-t0+ xepb 2ujoqicated.
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 unicycl)gd pqu 23. o1pr(navd;ax 8qhe moving in a straight line is shown in the grpndqga;ov31r 8h .qax(u) dp 2aph 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 circu+u 2nq1 5ie g1hhau,pgs clown on a unicycle moving in a straight line is shown in the gra1ge,nguh5pu12+ iq ahph 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 k kdi83 n4.ykn y9zp+)v;jzzcfalls freely 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 accompanyin/ esi0zk dv( i0,wnuj:7i0 ptdg graph describes the motion of a marble on a table top for 10 seconds. For which time interval(s) did the marble hav set00 pikd,(invji wd:u0/7ze a negative velocity?


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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.12: The accompanying graph describes the motion of a marble on a table top f/h10k43xc9vz e ykc5t s )jnspn7 t:meor 10 seconds. For which time interval(s) did the marbl4tx9sp cyek h0zn)k5j tc71es/3vn: me 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 0tn.vsnjv 34*l**,j xaognlfn )s mb-graph describes the motion of a marble on a table top for 10 seconds. What is the marbles average accejvs**v -4jn, nn0ao)3lb.xlf gmnt s*leration 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 accelera nc+zw,abp7w 6m8le*-qrpv 7w tes uniformly 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 )uokh:l:v aa06q0b 2wpkl;oddownward 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 followinga+ :yt kji-jc5 graphs could correctly represent the motion of an object moving with a constant speed in a sijay+5c : k-jttraight 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 cae,hep))t pv5 t7 /wpmdr across the floor for 10 seconds. What is the acceleration of the toy d m ,7hte)t)/w5vpp epcar 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 accompanyink ppli9ua ljruv4b uy*/,l4b+5,um6y g graph describes the motion of a toy car across the floor for 10 seconds. What was the total diu5*9r ukb, y4jb,ul4v/ymllu a+ppi6 splacement of the toy car for the entire 10 second interval shown?


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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.26:The accompanying graph describes the motion of a toy car acb bf+ 8lks55wwpy; v8eao93xiross the floor for 10 seconds. At what times o;av+xsk8w5l5ybif3 8e9opw b r 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/hr in 4.50 s. Whicho v5y bx(+udn4wea8.r one of the following choices best represents the r(euy n 4dv.bxoaw85+acceleration of the car?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.07: A car has the velocity versus time curve shown. Wh m,rv2uzqm+h 5 sswpn)i-*bz4 ich of the following statements regarding it 5qwsp-i bu+,mz* hsn24rm zv)s 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 a8t. yqn qduc,k6 d/fe;xwo)h /long the x-axis according to the velocity versus time curve shown to the right.cn; qu /ed.6, ykxqfwod/ 8th) 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 thh75wgvypmg 0. 9loye:xxj0 (ad /3o:mdify:q e angle between the velocity and the acceleration of the ball is kept at a coa:x ggo3d0y:./wyf0 h5dep i m 7lqv y9m(ox:jnstant 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 lmk9u 2p+ lf(j150 kilometers apart and traveling toward each other. 2mujf+l lpk(9
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 *bnzh/wk2 mj/is positive and increwbknj/ z/* 2mhasing

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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 vm2 0vgwe67z /sahmk7fd im 4n+elocity 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 choices idx(bzh4 c5dvmz .tj23q entifies quantm(jd3bcqzh x45 2 vz.tities that 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 movea ; xaoazb8 8w66hm+ rpe8p.q3uq1r cjs $3.0\;m$ 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- /2cclxq:03k.. , d5hcqhmojthx eo5 wtime, $y\;vs\;t$, 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 4k1o u-+.bd (xzkzswlT in twb oskx-1l4.z+w (ukdzo 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 straia3hy4;jmkk p 0ght track is shown in the diagram. The thick line represents the velocity. Assu4k map0hj; 3kyme that the car starts at origin $x=0$. At which time is the car the greatest distance from the origin?


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.24: The velocity vs. time graph for the motion of a car on a straight track +qk9e 4u1cxr fis shown in the diagram. The thick line represents the vurq 9k 1ex4cf+elocity. 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 )gxelcpb ):sf3bnm1 jrj9- j.object given by the position vs. time graph shown. For what time(s) is gm-)bpce9. sl) bjf1xj:3rn jthe 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 v7vjw2gf(:n x vt /+yzvelocity vs. time graph shown. For which t w2v/+yvgjt:vzx 7(fnime(s) is the acceleration of the object equal to 0?


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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.24: By computing the area under the acceleration vs. 2ul qa ,i;n+n90geqnh time graph for a fixed time interval of an object’s motion, w a+nn i90eqn,2q;lhug hat 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 increaa.q ,(txrc/mas:x wj 0sing 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 :shr abzj4*fg t2z1 q7in 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 is releas1c, r5o k.wlexed from rest and reaches the ground in a time of $2.50\;s$. Neglect air resistance. With what speed does the object reach the ground?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.03:A small object is released from rest qz,t 8h1a 5k9hy8 gbmtand 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. time0 r0yt(-et:- /r, oe flsa37nihd rvfg graph of a particle moving along a horizontal axis is shown. What is the total distance traveled by the particle from t=0fi h0a0,(gors:ent/vty -ed fr-3 rl7 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 t z)z3hz(-yjgwobc3,zhe following choices correctly identifies all of the listed situations for which there is a non-zerz3)gzzb,3 c-z( yojhwo 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 linn(g3qru qo3a3 oe )xr1e is shown. The object starts from rest at time t=0 s. At what time(s) does the object at qq)orx(e rnuoa3g331tain 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 acqz8 l:4 08goom ls7scwv /br-w9u9tdt the origin and its velocity along a line vs. time is graphed. Which one of the following choices r mg8 /:lud78zlocswc99tv q-s4wbo0 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 movin8b b l*z*l upqlvfs*6n6 ,4hlag to the right on a horizontal track, each with constant accelera u4*86 ,l fllbzsphl*6 q*nabvtion. 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 hasp1m )t5 :hlwpe 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 time shown ix a ;8ovi6)2omq a)gfhn the graph, which one of the following choices correcta;xo o68qhga f)) 2ivmly 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 13tnd .d7()s mmpilfc choices best describes the instants of time, at which the car and truck travel with the same speed?l mt3m )7 p(dficnsd1.

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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 origin and will m; 17lr5 j0nlnkea et64mnm5uwpy1 2dlove along the x-axis. The 5ae nt5uy ; 0lemd6j71pl l2nmnw4 rk1acceleration vs. time graph for each car is shown. Which one of the following choices correctly identifies the relationship for both the speeds $v$ and the positions $x$ of the cars at time T?


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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.02: The position vs. time graph of an objecrxbd-zy(pdg 9e7 u diu 74g c2*,tuo9at moving on a horizontal line is shown. At whatddrpb,-7( yug9z29dutceagx4*iu7 o 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 following the position vs. time graph pwpa,-*t dopo) rovided. Dupdtp), woao* -ring what time interval(s) does the mass have zero acceleration?


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