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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 atcmmc+2s we2p+ 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 )p t3eff56a2w s av3- ema2rvzwithout reference to a particular direction is f2v et )e-zsf6a a3aprwm3v25called

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  12.29: A vehicle completes one lap around )w iwwg;2f2d7f:e9 et qt8o uya circular track at an average speed of 50 :)9geq2u o7tw; fiwdy2tfew 8 m/s and 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 movesv wgj3*o/r rpyu+ eid:aw(-)p 0.80 m in 1.0 s at the constant velocity. If it continues, how far will it trave p er*a i+3-(gw:wu)rpvody /jl 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 +1cmomqod 2.43jttdyq , /rwustationary on a 30-kg plank that is sliding at 5.00 m/s to the right across a frictionless pond. The boy then turns and starts walking on the plank at a rate of 4.00 m/s to the left, relati+m3tcwu4qjo y mdq /,1.2rdotve 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. Whatv9 .fgzng 1ug2 is the average speed 9g v1gnuz 2g.fof 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 of a toy car traveling alon5gclc k70z/h-m 8l dxgg the x-axis. The graph shown below is a plot of the car’s velocity in thchld580 7/ g-zxmlck ge 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 refe ss, txjn)4x:drs to the motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity x4sj:,nx d s)tin 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 r*f frx nc u*8jcmu lrmklbyv;*,/c +(*efers to the motion of a toy car traveling along the x-axis. The graph * xj+c*rm/*yk,r 8;c cuumfl(nbflv* 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 velocity vs. time of afb exxs*m,v06 ewxv)o. e w51p duck flying due south for the winter. At what point did the duck*)vwx01 epoewv ,.xsm6efx 5b 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 whi(dpz 2qo,zne.jiwr48 ch shows the position and elapsed time of a car starting from rest and uniformly accelejo4 p,r zn8wde z(qi.2rating 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 diagr7: - 5afdj jp7kggb*2mfqjj6sam below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The -mj:57k dj6qg 2 fgbj7fsa*jpaverage 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 fuj5r )aoa 22fpor an object with the position time graph shown in the diagram atr ajoaupf 522) 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 followingzg,a*q6u1zn v question refer to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits tzv6n,a*u 1 gzqhe floor and rebounds to its original height.
Which of the following graphs would best represent the distance above the floor versus time for the above bouncing ball?


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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.29: The following question refer to the following informati:(yyqyu) a3*whg :jkc0 9rdm+q fn* ncon. An ideal elastic rubber ball is dropped from a height of aq hyyna 9 y:f:mj0r*qc( n) *u+k3dwcgbout 2 meters, hits the floor and rebounds to its original height.
Which of the following would best represent acceleration versus time for the bouncing ball?


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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.39: If a boat can travel with a speed ofd)arsa ,-e-(rv nzrm1 $v$ 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 tnz3 a29 dzftqb784txe ,h0pdzhe 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 rfkmsw )v1q 9.gefers 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 re g 4m3wj6g;apxaczv2 2fers 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.
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 1wzm7pgds koa88 ( 9jd ;fras3the 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 the1;1lebl nfd7s/ k:arz table edge. Which of the following would besl;1d:1/lfn 7r esba kzt 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 betwn ,fai,g48dtj,kr+ aieen distance and time for an object that is moving along a straight line. What is the instantaneous speed of tj,8a , n+t r4i,kigfdahe 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 represent t4:+ktlt5boj s the relationship between distance and time for an object that is moving along a strj o lbt5+:tkt4aight 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 straight downwan b3-.-:wesa s,1q4lgaf /kvn q lnp*urd on Earth with an initial speed of 12.0 m/s from an.qn n p sla -guw:-qb1f/ska4 *vel,3 position 10.0 m above the ground. Ignoring air resistance, the speed of the object when it reaches the ground is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.11: The diagram below reruc qp x.v: rfz-f(47xpresents a toy car starting from rest and uniformly accelerating across the ff4 7vfcrp xqu.x rz-:(loor. 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 starpz :k q:e8j o2;dtgr6yting from rest and uniformly accelerating across the fg6z:8t;kyeopr: q2 jdloor. 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 reg+.e z-t:q1vxad 2aiepresents a toy car starting from rest and uniformly accelerating across the faaq. z+xe-i v: ge2dt1loor. The time and distance traveled from the start are shown in the diagram.
What was the instantaneous velocity of the cart at 96 centimeters from the start?


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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.08: The diagram shows a uniformly accelerating ball. The position o rn ig8.2h,:at qjsyin1mrt) -- dk-cef the ball each , :r s8.)-ittcjagiy2mrdn ek -n-1hq 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 accelerating ball. The position of the bald rb)et4)b4i9 )bxzzll each s) zrdtz 4xb)bei9)b4lecond 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 ul .bb0 qp.)jrpe5dgt(+: aapnnicycle moving in a straight line is shown in the grapt p(l:+5 b.apeb.jgprad )q0nh 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 p*mj,owa (il( clown on a unicycle moving in a straight line is shown in the graph bp(im(,aoj*w lelow.
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 surfa:l *q n.w2 jkikeh)0wbce 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 +aye a f7vlgup ht(ad 9d,r9*7graph describes the motion of a marble on a table top for 10 seconds. For which time interval(s) did the m9ul h9afvda+dt(a pg ery,7* 7arble 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 a marble on z27 /6 ksd8 hjapzsuf)hd0qv0 a table top for 10 seconds. For which07sd6 kq zhasv)p20dhju8f z / time interval(s) did the marble have a positive acceleration?


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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.13: The accompanying graph describes the motion of a marblemai1z7biv ;t7u8 wgxu;j,vd-s 3gz: u on a table top for 10 seconds. What is the marbles average acceleration between t = 3.3 s andjiw,a usu3 -tx7dg;vmz8z7 :gvu ;b1i 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 for a 0grpn 6q, 3*d+v lvsyptime 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 wzsjhsq tn+i .i: 3m8w8lxcj 5(ith 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 followinenw66ger 8b 9wg graphs could correctly represent the motion of an object moving with a c689w gnewre b6onstant 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 th4sbi8ieg76;v g (rz coe motion of a toy car across the floor for 10 seconds. What is the acco (zbgirvg78s;eci4 6eleration 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 accompanyin,wc-r5 an x9krrjka: (g graph describes the motion of a toy car across the floor for 10 secondsr: 5k ,a j-wx9nra(rkc. 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 desc uoc.,xrak0zku)/ l,g ribes the motion of a toy car across the floor for 10 seconds. At what times or time intervals must the net force on the toy car be zero?ko, xg/ur )0lz.c,ua k


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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 4.5rjcmc) 0,2 ouz0 s. Which one of the following choiceou2) rm,cjz c0s 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 time curve shown. Which(/trbp)rg 1 )yd+2 mvkvn( cuw of the following sttby(vmr +g1 /v )wd2ukc)n(rp atements regarding 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 accord/)6zibet no .ja7 7bbying to the velocity versus time curve shown to the right. When does the car have zero acceleration?ne7oyjb i)atbb 7z6 ./


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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 tim2;b r3kzasi) yz rqv-6e, 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 statei r6y-) rszv2q;k bza3ment 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 kt)1qc;9m1jl,pqb nsj ilometers apart and traveling toward each other.c9 nt)bmj;slqqj,p11
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 posib3h7cidl /hiq enz ,68tive and increasing/,ci3h bdq8iz7ehn l6

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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 aver r27a g;gj5vpnage 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 wflw(t6y;j z/ b6a1fpdimensions, which one of the following choices identifie ; 6lt1bf(ywa6z f/wjps quantities 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 moveyn:-gq3v y/ryz( igv +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-time;gvwou,z30 aj , $y\;vs\;t$, 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 b8r(p*r -aj y k7bjn1b7wxp1 . y:jhzxtotal time T ikb (n:1j*arj p8 xwzp-bxh 1y77j rb.yn 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 motionuo4 a/j9jouqu(yh x9 :rnq 3.t of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that the car starts at. t9o /(3hujquxyqa:9jo 4run 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 fo d+pvgh h19:p:kdjpw8r the motion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that the car starts at oriph 9h gdpk:1:j8v+wdpgin $x=0$. 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 act; hxpxu 0hnv-lq: ;+n object given by the position vs. time graph shown. For what time(s) is the speed of the objec+0qlu ptv;h:xch; n x-t 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 velr4c**qa *ubyen2/bq docity vs. time graph shown. For which time(s) is the acde/rqay2ub *bqc n4* *celeration 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 k44hxw zvk ;9hy c *bz;1xzly9vs. time graph for a fixed time interval of an object’s motion, what quantity has been d xzyzczxlk9 by1*4;wv; k hh49etermined 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 hz*o6 mtme.(s 3sn +zxlorizontal 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 pa+, itrwm *: h u+0siyrz6smnp0rts:
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 isle uft3.bu 2pe*n3i tg98yk2uro8xm xn, f11 b 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 from rest and reaches the ground in a t3jg + 8m*zm h8yi;+devde k9vs.dv1 wyime 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 oj 7e-9dbh,smiz1w+ v.mm ur,f(e* quof a particle moving along a horizontal axis is shown. What is the total distance tr1 foj7eesh b imdvu(urwm,m-q+9* ,z .aveled 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 identifingn0 et:qt0 0 1nwa/pres all of the listed situations for which there is a nont 0en0r a1/ qtp:ngn0w-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 mxxgirzee(:+ ; c6fness,p( j+ oving along a line is shown. The object starts fr, n xe(pgxss ei6(+j ;:rfzce+om 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 or01hk: eix769q0n biwe uw, zwjigin and its velocity along a line vs. time is graphed. Which one of tjkn:b0zew qiu 0 ,h w7i1ex69whe following choices 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 onz)c4of3d w3ye a horizontal track, each with constant acceleration. At an instant of timc)fz 3 woe3d4ye, the information about the cars is shown:
Car #1: position = 125.0 m; velocity = 13.0 m/s; constant acceleration = $1.5\;m/s^2$
Car #2: position = 80.0 m; velocity = 9.30 m/s; constant acceleration = $5.5\;m/s^2$
During the next 1.0 second of motion, which one of the following choices best represents what happens to the distance between the cars?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.14: A particle has a p fob,ux p3/u qe4dwa+)osition $x$, 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 etsh/0 2guy pgn dqd),ho*-r;time shown in the graph, which one of the following choices correctly describes the relahhsde t qg*gu, pyd-)r2n0;o /tionship 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 describe/ 4r5h 7cm gs))9icplch gxksr665baes the instants of time, at which the car and truck travel with cse gi 9cr a57) gh)rhbl6pxm5kcs4/6the 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 start from rest at the origin and will m(5 ucevj vo 3k7q.wnnq6 ui.c(ove along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the following cqcujv 6.qkvceo .3in7 5w(nu( hoices 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. time0*7uj,jy*xd jl 7qxqzbci)ry0n6 ke; graph of an object moving on a horizontal line is shown. At what time(s) is the object j0u6d in* x);q7*jbck z0jy,7 rqylx emoving 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 folnk5( el:d.dfoi t0d7s lowing the position vs. time graph provided. During what time interval(s) does the mass s 5.i0d( 7lfdkdto:enhave zero acceleration?


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