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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 constantb -j.b3f w;8nw lsywd+ 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 withougsv.c a; n. * abkacukz,:sx-6t reference to a particular direb kkxnuzg6c.sa a.;-c, vs:*action 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 completes one lafl;+ u8xhx dfygo *s):m vsg.9p around a circular track at an average speed of v8 ox m suffl +;*x9ggsd):.yh50 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. If it continusq+t y1pjzuse4lkbc )h2j j nm/6,q8 :es, how far will it travel in s/4 s zjenk pcjqhm: utqb+)l8j1y62,3.0 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 i bf9ai2g*p/ ou,opndr+* b3wzs stationary on a 30-kg plank that is sliding at 5.00 m/s to theiu 3p ozgpr 2da* *w+fb9bon/, 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 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 kmif/7wfrlqz3h+v j:o5 at 100 km/h. What is the average speed of the motorist ofi zwro/h37 + f5jvlq:n 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 t t 2 xqra.sc1j4kq(n;zdmr,kh.-m mzoi9 (o-yoy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the x diretm(4mz-kqa2o .9crmh; z -dn(sx.r k1iq j, oyction, $v_x$ 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 mot9n0v:7npafwuj. ro x3 ion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’vn u.n0p:3 rojafw7 x9s 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 cat9edd*tosm- l6fuit 73*e ov(r traveling along the x-axis. The graph shown below *s-edvof3lu 6t*m( ti 9o e7tdis 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 vsqzo*ch3bx4 xshu )n(;. time of a duck flying due south for the winter. At what point did thebc* xz(qn34 hhsoxu) ; 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 the diagram below which shows the po) u9b( jg76 so4.ede)atwstrnsition and elapsed time of a car starting from rest and uniformly accelerating in a set))dar (6 sw 97tg4soje.ubntraight 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 diagram below1m33 uyql(dwe ,4mbmzue/v h. which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straightm1zyv43m ,u3(lh q / w.uedmbe line. The average acceleration during the entire 3 second interval is closest to


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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.20: What is the shape of the velocib qzyxu.ecpz ;z6n:+ 6ty time graph for an object with the position timnuex.b+6y :6q; zzzc pe 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 infor 4qhzdwc d3nm)x5 +f+ylf8.rxmation. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and reboundcl3)f f. ++d548 mwxzqrydhxn s 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)ek 0;y5vnti6 c i e*vev+cv0 /ix)vrxl elastic rubber ball is dropped from a height of about 2 meters,vy ei5ev);0v0 6e)xc ctvkn+/*rvxii 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 e-v va,vt 11az$v$ 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 scenario: 66j, n) zn1 fijg,yb*evgm f2qAt $t_0$, 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 following scenarioyc sf.;uzr rz;p062i(e4kmto 5yx)a n : 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 following yybzj;q9qq2drh s/u-rs 2 8/e 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 -rg vr,u 0co2t(ofd(i6 px5mithe 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 ro.i)1(s wdu)b5ts :wz . nuau3 n-ndaizlls down a ramp, across a horizontal table top and off the table edge. Which of the n1-) (ub5tuz .)n d:w3indz au.iswa sfollowing would best represent a graph of the magnitude of the ball's acceleration vs time?


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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.01: The graph represents the relationship between distance an;:.tj,h ,qqtr zf1 fmld time for an object that is moving along a straight line. What j; fft1mqzltq.rh: ,, 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 reprekx/cj,;u j ou8sents the relationship between distance and time for an object that is moving along a straight line. Between what times did the object have a non-ze;ux jjk/o8u,c ro 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 eisv1 +.r( xkcEarth with an initial speed of 12.0 m/s from a position 10.0 m( +ver.x ki1sc 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 represents a toygo -:b-t6n2s xe)1id/x yz aso car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start are dt:yoa 2z-/sb6sio 1n )xx -geshown 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 s5mw d/lryi/3 po3nsz xc t,.s5tarting from rest and uniformly accelerating across the floor. The time and distance trax lmnp/c d3i3t, 5zs/ s5wy.roveled 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 uniformly a5 9g+ u3zze pdzpyq:2bccelerating across the floor. The time and distancey2b +e 5:z ppuzqzd9g3 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 of thj)k1d t s66kyde ball each secody d6)6kstk1 jnd 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. Tt;+d(xc) w7d:bh qp 6ptvsfu0r(3gae he position of the ball each second is hc ;wrt6 0 7sdp :)dbvpet(3aqf x(u+gindicated.
Which of the following is closest to the acceleration of the ball?


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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.17: The motion of a circus clown on a unicycle moving in a straight lovketm dpjkf2i:j00(l+ov hy-2-h: yine is shown ine :o20t+vm pfhy0jdl-( h -k:ik2yj ov 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 moving in a str,i7hn r2o22 cg )(e gttvejl((/cpyoi aight line is shown iv(2rl,e2gnc2yig( h/ j7poo(ce)tt in the graph below.
After 12 seconds, how far is the clown from her original starting point?


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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.04: When an object falls freely in a vacuum near the surfasqsns r 21bb0bvp73h yan-o s,t6mh-8ce 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 marble on a tablefwnu 4p)z(m 0u top for 10 secondp4fw0n)uu m( zs. For which time 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 accompanyin+e,au(r/ br c5ysvd2mg graph describes the motion of a marble on a table top for 10 secoy(+ cd bvs,5e2rrmu a/nds. For which 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 grai3t0 vyp+3flduq 83h1 rzn; t1tl7mqq ph describes the motion of a marble on a table top for 10 seconds. What is the mtzu3 t 13dqmhnlfi+0tlpqy7r3v1 8; qarbles 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 accelerateynv es s 29 kj09csr2/ywf*rhj81+zwns 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 downward with a speedj7ohr/9,z itxonw25 f of $20.0\;m/s$, takes $2.00\;s$ to reach the ground below. From what height above the ground was the object thrown? Ignore air resistance.

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.03: Which of the following graphs could correctly1fi 99y,fwms)mk- x:ks h t7tq represent the motion of an object movin -m: tksk,)t17h99sifx m ywqfg 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 grcq 7 l.n0ac.-p 5zo5vspnf pl0aph describes the motion of a toy car across the floor for 10 seconds. What is the accel0czpql -5p7l0. nvps ncof a5.eration of the toy car at t = 4 s?


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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.25:The accompanyi+p os.p8bog 0jng graph describes the motion of a toy car across the floor for 10 seconds0+gjoop 8p .bs. 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 ga*aer*ej xz p f:dvw7l 2,4n q++,syeiraph describes the motion of a toy car across the floor for 10 seconds. At what times or timef a 72pejswae :zrql +i*ne,+y,4dv *x 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. Whu5jnds ( +) h+eoj+jkt2hv 7qr 4ppk/vich one of the fovd4ekoukj2rht pn)sh7 /v(q +p+5 jj+llowing choices 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 velocityt4 (oqxe71ry51 twby l versus time curve shown. Which of the following statements regarding o4trqxel 11 y(ywtb75 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-axisqtsor;8: jx: uquyoz m0 +v)4u according to the velocity versus time curve shown to tj0s: rmtyo)xv8o4q:uuuz;+q he right. 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 the angl-9 + uigeaf.hke between the velocity and the acceleratiof 9g+euaihk. -n of the ball 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 150 kilometers apart and travel:nl jvqu on(y-p;j.. zing toward each other.-jyn(uzp v l:n.ojq. ;
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 indpnn0 /vkgvbu1 wo5 oob)mdh+ 88g4e2crea u4o5nomb88pg 0gdko/) 1vvhn2b+ dwesing

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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 ao1d(7be0of 5rs jb8 wsverage 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 twomgiw7d toq3*-+x ;z.g by jqb( 50ijau dimensions, which one of the following choices identifies+gqi a 7;w mzx-0(ub* 3gyqojb.i5tj d 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 move;z1vp:s4podxmta,l2 : p fc e,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, *s36vkp+l8ew- ) vj.d:vgj lj)wpmws$y\;vs\;t$, 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 tra7cqtw ff8 j3.;d)sq obck for total time T in two pa8f3oc7dfb;q) tj .w sqrts.
• 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 fjxn c-- zfdkeez3* 1h, n9yxm(or the motion of a car on a straight track is shown in the diagram. The thick line represents the veloc fye jzcnxm,kx3-1h9(ezd- n* ity. 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 graph for the motion ofy)d9cg gsgv 0d6.x7w c a car on a straight track is)c gy c0vds. 7w9xd6gg shown 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 of3x 4ri- tb4kfo( ykk9m an object given by the position vs. time graph showntxk4 ybr i9 m3k(4ko-f. For what time(s) 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 object given by the velocitwl +u .0.(2f svaz4an pg5vwnvy vs. time graph shown. For which time(s) is the ac 0nan 5swlz+ fp2vw(av.g4 uv.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 underybeh- 0s2s6 e6dk2y qb the acceleration vs. time graph for a fixed time interval of an object’s motion, what quantity has0he6sy by d-b2k6sq2 e 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 incrsu3pol5jj u-99 dxu881iwieheasing 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 tp gqya 83zy5 p7x37hccwo 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 released from *c/k1(.adkl jwhl cl (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 ando0:dq+b;; z 5tsgdf(b, qfxvu 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 v bjvp:r; yc4 jji:5 2c92gkonparticle moving along a horizontal axis is shown. What is the total distance traveled by c4yojj2 vj9kbr5c ipv n:;:2g 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 core s1rc 4ro8i/irectly identifies all of the listed situationesico1 r 8r/4is for which there is a non-zero acceleration?
Situation I : A point object moves in a straight line with increasing speed.
Situation II : A point object moves in a circular path with constant speed.
Situation III: A point objects moves in a circular path with decreasing speed.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.32: An acceleration vs. time graph for an object movioff:z+ bq8 3xbng 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 itsq+ 3o fbxz:fb8 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 d-rbas dv681c:d0gpd the origin and its velocity along a line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of dp:d86dv1gadbc0 sr-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 movzb ytix,q5(j 6ing to the right on a horizontal track, each with constant acceleration. ,5x6 tzbyj(i qAt 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 aw l dqn bs+lo4x8h;*;l 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 tfoc7* xz4k e,g .wh9euime shown in the graph, which one of the following choices correctly describes the relationship between the average speed of the truck tocwe7uzf, *4 egho9 .kx 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 followifc2/+pz f a8vio/bwsxb:3x- eng choices best describes the instants of time, at which tse:fwc2 vzxo3f+x/b -8b/ a pihe car 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 and will movtj3vqy:dkjt v7ap28/( b pto.+ x dp;he along the x-axis. The acceleratio(tp +/3v.hjxy 8dt p pqba27;dj otv:kn 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 objec :sew,eacauy5sh d(7g4o 8.ktt moving on a horizontal line is shown. At what time(s) is the object movia ehwdu:75t8(ok ye.s, cgs4ang 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 grapt y3v 2;c+tdyph provided. During what time interval(s) does the mass have zero accelert3 yc 2td;y+pvation?


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