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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 constant speed around a circular path5/zcet-1rd icmj.t f rnhm 3** 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 witholfct i24- 9ov6p7fjv cut reference to a particular direction isv9 c-t4o7j6 fp 2cflvi 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 completes one lap arouuhtt5ah x;- y0nd a circular track at an average speed of 50 m/s auhtt0-yxh;5 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. kwa6u 74nnd,da/fk,o 0 s at the constant velocity. If it continues, how far will i aodnf,u,d6nk wk74a/t travel in 3.0 s?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  05.34: A 40-kg boy is stationary on a 30-kg plank that is sliding at 5.00 m/s 3 jc9nj1i))lhno ;qtp 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, relative to the plank. What ist qh) ;n139pn j)lcjoi 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. What ifurz0.5 nke.w1jift5 xqch( 5 s the averagen fe( 5ui.q fwkt.0xc1r5hj5z speed of the motorist on this trip?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.20: This question refers to the motion of a toy car traveling along g+mm3. )wzv p.mp q4ssthe x-axis. The graph )m3.zwvqm g4pms+.sp shown below 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 car traveling along the rhw dm 32fsk)mwi)s2ls4h, j) x-axis. The graph shown below is a plot of the car’s velocityslfi3 r22 smj w)),h)4 smdkhw 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 alb+p2k)4qprsi ong the x-axis. The graph sho sikp2b)+qpr4 wn 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 vsly)*-vp . wisl. time of a duck flying due south for the winter. At what point did the*ysi-v.)l lp w duck stop its forward motion?





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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.17: This question refer to wz+h501t ctpt2(mtch k2/ z nvthe diagram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating0t zm52kp thc12+/v (z tchwnt 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 diagra*. u(har5 xy,nls8o3c tpeuez/6(p iam below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The at( i(puhaaszox cr.epy *6/eu5 8ln, 3verage acceleration during the entire 3 second interval is closest to


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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.20: What is the shape of the velocity time graph for an obje nzsr0 7-1 g:vtt3ifvxibdf (;ct with the position time n7:x rvfi1b;ts ftd-vi0(gz3 graph 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 following is()sn.wkmu c1+ kw1u bnformation. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and re)bm+(uu1 k1.cskw sw nbounds 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 ,z 1e i d1i9jxeegc,rtv4 4xj ml2;e*nto the following information. An ideal elasticdxn1z e4 2gex9rvjee1;,,c*mjlit i 4 rubber ball is dropped 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 of 3+y3rk0n .nc7 kxzb8l5l/tzwwm mc5j $v$ 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 scexni fd3 n+wgn ga.)5uup3k 2,fnario: 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 an o+)abga 5h6es-n j0to 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 refer; pn ms8j/y+ vs;rs8gh7vh -fjs 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 the followin ) a9yo*vd,a :cqswc/gg 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 rp.ihyfv4-bx:64 3 bpa -tewirolls down a 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 acceleration i 3vyibrx:ap 4twhb6f -e4p.-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 representswin;:y-:xwvy. t 4gv q the relationship between distance and time for an object that is moving along a straight line. What is the instantaneous speed of the objey.4v iw:wgn-xq vyt;: ct 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 betws tkcc +0atoa8h9 3 sxwv1z*s(een distance and time for an object that is moving along t3aa*tvzk+18x 9(csw so csh0a 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 tl 0t; +h.* lnv+uu3x 6ygn if1uiuh/tfhrown straight 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 when it reaches the ground ist ulgy;16u uhxvil+ 0nh*ufti3n. /f +

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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 ca7ad4pk+x ztlj4+ojx(hc 1 7ofr starting from rest and uniformly accelerating across the h( +t7 7 +d4zfja1locjpok4xxfloor. 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 th c os: zcs0+rfhl/4t+ cox w8)bjgp-.oy car starting from rest and uniformly ac+s .lscxhfh: cbo0pwc 8r-tz+j)o/g4 celerating across the floor. 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 represents a toy car starting from rest and;b2oe l.5jier(lvch 5 uniformly accelerating across the floor. The time and distance traveled from 5vlhe5 lrj(;ieco 2.bthe 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 baw3gf:mxbgs6;5sp e y;ll. The position of the ball each second is indicatedew36gsx5;f ;ym:s gpb .
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 s wsz0ox,n u 49zcyd)w2pmg+o)yhb ):the ball each second is indicated.)dy)spw o o:m y92b,x+0suz g)hn cwz4
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 uqik0j )54 6t 9sozzlhjy13gfnnicycle moving in a straight line is shownz j6g 5 39fonks)tqhjl 4ziy10 in the graph below.
What would be the acceleration of the clown at 5 s?


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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.18: The motion of a circus clown on a unicycle movinhyl +vs (/c-dcv-*ir:eq5dq pg in a straight line is shown in the graplsh(/cevri:q c -pdv-5*yqd+ h below.
After 12 seconds, how far is the clown from her original starting point?


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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.04: When an object falls freely in a vacuum ib4 (ye,bc;m3(orzsynear 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 describ)j 7c: cfykuvjbuinl:4n ++/ii cb8y.es the motion of a marble on a table top for 10 seconds. For which time interval(s) did the marble have a negative velockvubybi+.7 /)c :4c: n l8ifn+ucjyjiity?


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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.12: The accompany 9s l-v 1.xlfrnr7z+tpc(i.x hing graph describes the motion of a marble on a table top for 10 seconds. For wh .7z+hvf-pr9nlc.r(sitl 1xxich 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 grapvt(1dd so5 z,6h3be2cx0tigr h describes the motion of a marble on a table top for 10 seconds. What is the madz2g1trbo50tedh,xi cv3 (s6 rbles average acceleration between t = 3.3 s and t = 3.8 s


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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.20: A car accelerates uniformly from rest for c9h. gc hks1 0a3sic;lm5v,h w 3xaj(ma 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 downwa hdmt.7fwwbd vlzv/8 n5.sj,g /.ah z6ndm;6 trd 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 following graphs cou,d 4oz iq7:,ej0sj3 eqzhq:uxld correctly represent the motion of an objezz:qux:e, 3j dj oi0q7 q4s,hect moving 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 a0t;fovx w a d08h;squav55jk* cross the floor for 10 secondxq;sh5 tk jfau 5 o0vawv0d*;8s. 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 accompanying graph describesandia/dn,pp+/o +e0 unk :q2 5c *funh the motion of a toy car across the floor for 10 seconds. What was the total displacement of the toy car for the entire 10 second ki2ndf oa d*ce u+q+pn np0ahun ,//5: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 mom.dr+rb(/ cj6aylk , otion of a toy car across the floor for 10 seconds. At what times or timkj/ ldo,c mb.+6yr( rae 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 froqq2jab u22amx( r:b/w m 0 km/hr to 60 km/hr in 4.50 s. Which one of the following chqu2 j2b(wm: 2q/baarxoices 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. Wh,i 9a mnj/)kshich of the following statements regahs ainmj9 )k,/rding 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 accordi-q fsk4d a 0;-le 325lresabhing to the velocity versus time curve shown to the right. When dsbq ha5f-lrei;ka-43sd le02oes the car have zero acceleration?


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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.22: During an interval of time, a tennis ball is moved so that the ang)ie5a7p*j:rt 7g(j 1ughm iq f33s zdzle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true about the tennis ba *gr 3 dt ah1gz7jzq :e)p5j7ufi3m(isll during this interval of time?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.03: Two automobiles are 150 kilometers apart and traveling toward each oth xx-ypfd)(p,1k xmv qy 5:mw+uer.)p+qufk51m:x-xwxv(dpyy , m
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 positive and inc mg/o.f undnacy/ad-art -4;* reasingc. -t/ad*mn4aod u;f arn g-y/

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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 aver0 el8 l*ytut63vlc um(age 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 choices i8 i ;oye/.wo5moca ) ccn7rs(pc-g8dudentifies quantitie-o7/ 8p. iw(sgo ;cmc dnye8car) c5ous 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 moves/ q/3ct 4vjchy3pr.h , ls4hsp $3.0\;m$ 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, n0natou 4,w d, ;kh :cc:siptx j1-hl/$y\;vs\;t$, 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 0x r9fe jn85ky kx+ohc1u,lf;along a one-dimensional track for total time T in two xh5+euoc j1k n ;,yk8f0l9rfxparts.
• 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. ymuf814 tuhud:n5(o ttime graph for the motion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Asnotmt81u f5u4 u(:yh dsume 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,520dj /mbelwn.u7rgnvhn uo7dd -b 5 a car on a straight track is shown in.unw,hd7 do r- n5mn g/b502lj7vb edu 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. t g e.3+;r7yldwctj(fmime graph shown. For what time(s) is the speed of the ob3g 7e;cl(+jmw yfd.trject 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 velocitg.g6k kws-me2y vs. time graph shown. For which time(s) is the acceleration of the object equal to 0 mwk-g. 6g2ske?


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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 underhj+7ojld 8,wvtf w)v2 the acceleration vs. time graph for a fixed time interval of an object’s motion, what quantity has been determined fvl fj)jh +vw8o ,7tw2dor 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 ns nx+-xwz8 n,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 54vmr.1c xit- v/ddtnparts:
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 time of / tv -a32hzjdfb9g3s5 azf3s a$2.50\;s$. 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 and9(yajo2:wnoj7j f,g d 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 horizontalrf 1(h7atm jhhi: *b - cyiqw:bx k,wqfd-:6*e axis is s a wjr x-c7e:q-:h1 b*it (iyq,bfhkf*dw6hm:hown. What is the total distance traveled by the particle from t=0 to t=10s ?


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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.18: Which one of the following choices correctly identifies allci*c7 b;xbuwxra)m 9yh1j 4u 5 of the listed situations for which there mc wh 5;91u47)b*j rcbixuyxa 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 obje 3wc/tufm90 um+oz 8gsct moving along a line is shown. The object starts from rest at time t=0 s. At what time(s) does the object attain a maximum displacement from its starting pm o8 wft3c9+ /u0ugsmzosition?


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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 alv; h-qhs;3xm*6hzloqff0d-, zw ws -skp+t*kong a line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of time for which the object is moving away from thehwto-*,;vz *dzw+sq l6fk3 ;q-0-k x smfhhsp 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 rigtd* gqhl73vv +)bj y bh- eku2(rlj89tht on a horizontal track, each with constant acceleration. At)el *b kq d t(tl3yv-gb+hjr2h8v79 ju 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 has a pwz/).hv1 z bzsosition $x$, 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 the7e6 )xeam0eqnn/ 3eqe following choices correctly describes the relationship between theen6e q/n7ee 0meqa x3) average speed of the truck to that of the car?


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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.42: Which one of the following choices best describes the instan0 ,loeov fav.qiebj2i ;ct4 3q1;wsc,ts of time, at which the cao1ilq,3av;ct ;4scj.ef wq 0veb io,2 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 thz+0*z s)fl hw5wc q.)p;x9xvqkjs k* ve origin and will move along the x-axis. The acceleration vs. time graph for each car ij*0s.v9p+f zzwv)cq)wh* kxq 5;x lsk s 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 kg //mf1y0zex of an object moving on a horizontal line is shown. At what x0eyzm 1/ kf/gtime(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. ti)xvr-yg w9 4znqg6l7 wme graph provided. During what time interval(s) does the m 64 xvz y)-7gnrgwlq9wass have zero acceleration?


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