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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 constan7 abt n-fn6-y(v*t mert 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 u5oxp +ys zk3v o+/xi.jnit time without reference to a particular direction is callv5zs/xkixo. pj3y+ +oed

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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 aro8 h9knfrah 5s5und a circular track at an average speed of5hsh8n r95kfa 50 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 moves 0.80 m in 1.0 s at the constant velocity. Ifl1bp gk;y ,0/ amxbae7 it continues, how far will it, 01pg7bekb;la x/m ay 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 thatner6j )(j63 d8ovf ytg is sliding at 5.00 m/s to the right across a frictionlesgtd)nrjeoy f83(jv66s pond. The boy then turns and starts walking on the plank at a rate of 4.00 m/s to the left, relative to the plank. What is the speed of the plank relative to the pond now?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.18: A motorist travels 400 km at 80 km/h and 400 km x-.2k/etg p xrat 100 km/h. What is the average speed of the motorist on this g. pe/2xt k-rxtrip?

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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/oc22(sab yd l a toy car traveling along the x-axis. The graph shown belowb(c/2 2d lsoay 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 :r(laio kg66fi6 9gtd refers to the motion of a toy car traveling along the x-axis. The graph sa g k6l 66od9igtr(f:ihown 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 toy car travelibsejao(ks4 ;h4op. ,a.y:bj tng along the x-axis. The graph shown belowhskeob, ot y4.j :a.4ps(b;aj 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 flying due sou pw:v 5g(rv kcz+00)mcxejik+(o- cbvth for the winter. At what point did the duck s5cv( o0 v ri0kmb(vpxw:+kj-cz+ )ecg top 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 whichzev8 qu).8 mnrsg uc779 mik,i shows the position and elapsed 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 seconduc ik8g7eq m9rsv.8inz7mu),?


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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 thexw .occ2t4pa 86su,os: ev +bu position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleration dur8b .wospcca+4osxve:tuu 2 6,ing 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+cay-wp5 tul.8k6 uis graph for an object with the position time gkli-utw sp68. +5 cyuaraph shown in the diagram at right?


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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.28: The following question refer to the follnzxy,2-xu c w4owing information. An ideal elastic rubber ball is dropped from a height ofnc4,-2 uzxywx 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 following information. An idea 83,fhpq8x*rrz-fyotz u (*dul elastic rubber ball is droppedr(,fpt-zxf u 8* ydq3r8*ouhz from a height of about 2 meters, hits the floor and rebounds to its original height.
Which of the following would best represent acceleration versus time for the bouncing ball?


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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.39: If a boat can travel with a speed o.,c5ctyf 10hvz/8vk1aq u lgj f $v$ 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 th;)ebonq 47z uge 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 tl1 +. . ctzf02netm9alyf-7b 1cpto ydhe 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 followinn ygtabq/ 9v7a-q4cz3g 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 1fhwe-) 5b9spyf/ f/y7rfe xf 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.
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 u vk0:q byk19kup9( tqa ramp, across a horizontal table top and off the table edge. Which of the following would best represent a graph of the magnitude of the ball's acc(y9 kqtpb1vqu0u: kk9eleration 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 repra5cydp5i2:j9 gpsxzoo n5 7eo l.6 yu3esents the relationship between distance and time for an object that is moving yopz6ea95o:gyx7 n3.5 2i 5ldcpuosj along a straight line. What is the instantaneous speed of the object at t = 5.0 seconds?


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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.02: The graph represents the relationship between distj mn5o*b0a *pcance and time for an obje 0mnjapb5oc** ct that 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 straight downward on Earth witho nzf- v2n*,kt c1*bfr (jqu-y 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 reac y2ff b-t-z,*oqn j*ru(cn k1vhes 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 starti-*plh8mtdl 630 tbh pqhtq6 3rng from rest and uniformly accelerating across the floor. The time and distance trmhqt t0p36r*qhh6ll 8 3b-pdt aveled 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 um i9gs(j+y zm vh*la,z/vl (/uniformly accelerating across the floor. The ts( h/ yzazjg v9i+ul /*m,vml(ime 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 represents a toy car starting frocis9rw /:f6l fxe1aooixq374 m rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown o3:/caofrfw46x i91lqe x 7s iin 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 showon vdh6z,1x* ks a uniformly accelerating ball. The position of the ball each secondhz, *n1ov6xkd 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 posit m1xd:: l+s.nmrk.rmui7+nm vion of the ball each second is indicam+rdu+sn.l m m:mv k.r:x7 ni1ted.
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 h gj ,0 qy8u7fn// hu.o3vb-vpe-dap sunicycle moving in a straight line is shown py/f8uh-bjd-npv s 0,3qh7 .uo v /geain 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 yq//hw, ,o8(::llvyj . urvqdc*vm iton a unicycle moving in a straight line is shown in the graph belv .c(,, /y8udtvv:hy*qqri :/owll jmow.
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 qexy,cpy6l34,nlxr 03 f5 bof 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 ma(:sy*r3;awacao k4v hn 3/qntsi, 2marble on a table top for 10 seconds. For which time,yn :as;co4/3asq( hn rwa t2i 3*vmak 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 of a ma mvb+ vparvf 0+9v4l t5lh(o5nrble on a table top for 10 seconds. For which t(v4vt50 bamoh9nlv 5 fp vr+l+ime 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 moti0 zi5kzagbnt 9 2qrsa 5 ;kp8,gm7wh) rayp98mon of a marble on a table top for 10 seconds. What is the marbles average acceleration betwe0p;t)m29ag8 w9k8nabkqrirsza h mp5 zg5,7 y en 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 uh 97infdex s*:niformly from rest for a time of $2.00\;s$ through a distance of $4.00\;m$. What was the acceleration of the car?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.06: An object, thrown straight downward with a speed ofkk t,ll 5t;zp. $20.0\;m/s$, 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 may dw;t0+ low6 f)r7t u,y,q 3gfrxd(motion of an object moving (0 3ladtyw ,g;ydqtr f+6o,wmf) xur7 with a constant 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 avyfyjk+y/* 2a 7uy9pvfd ;q dyp g0p1n9a8r3q cross the floor for 10 seconds. What is the acceleration of the toy car at t = 4 s?p 8kfpryjgunv qvdq* 1d9f9p2+yy/a;70y ya3


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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 t6:6zbf ilb0 84rgv, ugp(nkdxoy car across the floor for 10 seconds. What was the total displacement of the lf i84(,du vzkb6 xg:rpb06gntoy 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 ttc/ ;7dk7cnun oy car across the floor for 10 seconds. At what times or time intedknc/ t;u n7c7rvals 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 .hadkoxb -m7.uniformly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best repk7omh.. -ba xdresents 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 shn5q)v 39)l wmdhnenw9 own. Which of the following statements regarding)3w9l 9) dnnhenmw5 vq 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 cuxdmbd(mc3 8v2 ir ,y/eg.h 7according to the velocity versus time curve shown to the right. When does the car have zero du,m/heciyx rbm(7 v2c8.dg 3acceleration?


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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 angle b;b sxi xml (xli.eq.),;gnm i.etween the velocity and the acceleration of the ba b(lm; .,iinxlg.mqis. e ;)xxll 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 1 8;iy6ks hhtk450 kilometers apart and traveling toward each other. ks;thy 864hki
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 accelera; wdd(dg gpv8(34fg yztion is positive and incready4p((d3g zgg ;v8fwdsing

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.12: The definitionmki6 a,2 ,k0thp4+er f 7pysfm of average 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 following dvfj*mj9-a;q 9. zp pcchoices identifies quantities that must have the same direc.*; p9m9fjac-vpz jdqtion?

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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 mov3hdduugrueo 5 b u4j/7 r q4m/g3i;3ries $3.0\;m$ 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-timl o)vw8,5v8 o/mtwjl w0 j ukz87law8ye, $y\;vs\;t$, 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 pqh56(mffu g i4w-av3one-dimensional track for total time T in two parthfum(qw -gvaf6 45p 3is.
• 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 oy:1+z,f f;ee7tmldsx n5o 9dstraight track is shown in the diagram. The thick line represents the velx 1td,7:e m yofsno5;ldz +fe9ocity. 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. time 43vod0e(2okc t7krsn graph for the motion of a car on a straight track is shown7snok0cvek 4td 2r o(3 in the diagram. The thick line represents the velocity. Assume that the car starts at origin $x=0$. What is the average speed of the car for the 10 second interval?


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.08: Consider the motion of an object given by the position vs. time graph sho) p01mt 6lb9xv e)vukga7tcr,wn. For what time(s)l19k vu gxcat7p )re0b ,)mvt6 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 objeaw0sn, cns +l:ct given by the velocity vs. time graph shown. For which time(s) is the acceleration of the +lc a0wnsns:,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. time graph for a fixe9n7 zq)t o,mjod time interval of an object’s motion, what t9oq o ,zj7mn)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 moveskx+zf+ du49e v along 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 pavd)o4j30:w rqb9gk 3 u dowmv8rts:
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 tiy5upo w ys6j8 (-3t-wur8 zzrvme 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 fro p4np, j6gfok-o*b8k2wb .vx .wq nnp:m 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. time graph of a particle moving along a horizontal /hcsr d:* d*f4xml(zo wwh9k; axis is shown. What is the total distance traveled by the particle frz(dol* w4f :; sh* m/rkhcxd9wom 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 fo1 ,bd ;:lbkjd+ywrne:md49ug llowing choices correctly identifies all of the listed situations for which there is a non-zero accelerd:dw+b:k b;,mlujd14 rny9geation?
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 alv4e dyhamg 3 x4n+ /.brb8wwb-ong a line is shown. The object starts from rest at time t=0 s. At what time(s) does t43w-r8ngbhwym e4 b/.vx+abd he 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 origin and its velocity along a line vs. npj+f/nb rt5) 2 zok7xtime is graphed. Which one of the following choices best gives the proper interval(s) offzxbp7 kn2/+n o )5jtr 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 ongmudgs) ss8dz+ 8(1 xf a horizontal track, each with constant acceleration. At an instant of time, the information about the cars is shown g(+df 8g8ssd)ux zsm1:
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 pol4*w66s:nyy9 a vya desition $x$, 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 th7pn94pypdcop 2-g(s m e+6g dee graph, which one of the following choices correctly describes the relationship between the average speed of the truck top s+oe92dg6c-p7m(npp g4ye d 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 foll),md2z+ev obf(t +ndvowing choices best describes the instants of time, at which the camd d(t,ezfnbv +2o v+)r and truck travel with the same speed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.30: Two cars P and Q, each start from rest at the origin anrs5a(qoq0+ bv;tu v5 d7skv a//mfi2ed will move along the x-axis. The acceao5eqd/rm + vv ;f5uvbki0a(q ss7/t2leration 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 object moving on a horizontal line is scb-/ ;m, dqdfe/;d dc,f-b meqhown. At what time(s) is the object moving with its greatest speed?


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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.08: A mass moves along thiq-nq79 a6uk r::;cjiueduf1 e x-axis following the position vs. time graph provided. During what time interval(s) does the mass have zero accelerat7dk q: ei cja:;6rq1u9u fiun-ion?


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