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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 arog2*jnspo): j xund 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 without reference tymqwl p25p++ nr9e (sdgjr8r (o a particular di+wd9e5 prrm 2 rs(lq+njy8p(grection 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 lap around a circular track at an average speed meq, pj7a lovn,;6q4gof 50 m/s and then completes a second lap at an average spm6 q4l ,gjnvpaeo,;7qeed 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 continwf /9v9ouk83 d lsc zdri;;qrela4* s)ues, how far will it t8q d;ld e)sr/v9a9lf;3z4wsoi rcu* kravel 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 2pg ci5vczpr,8hno 63at 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, relatio8 vi5,3nr zc6gpph c2ve 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 1p 8,r ez 67mq q8;,ojnves.byx00 km/h. What is the avera qb,qx ve8pe ;.z ,nrmy7o86sjge 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 t2vmd )*,ll ezphe motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the x directm2ldvpe ,)l *zion, $v_x$ 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 ts;+2k4x)kz :ngx pudd he x-axis. The graph shown below is a plot of the car’s velocity in the x direction, d :sk d24zkxgx+;)un p$v_x$ 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 travel mbx/t()oaj16 ;emrb6yj zc*ving along the x-axis. The graph shown below is a plot of the car’s velocity in rax m(bbcejt) zm;o*6jy1v6 /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 duf xy, cs.ir (s05hap,de;c (uuck flying due south for the winter. At what point diu, src.hypfxc0;d, si 5(e ua(d the 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 belhvtulmav k4t j 6o3vois3**1*ow which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the 6h***tivmol jv a 4331v uskotaverage 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 below znd7r:qj1nvg /wqq3/ which shows the position and elapsed time of a ca: nqvjgrq 7nd1qzw//3r starting from rest and uniformly accelerating in a straight 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 velocity time gra42c qzmov52rjph for an object with the position time grap52 4jrczmoq2v h 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 information. An ideal ep fh- wbjo,+m8,(.uq;o d vchdlastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its juq, .bvd- po;h,cm(+hfw8dooriginal 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 tor2384xgnavk7: g q84dv/vs: mazhwgn the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its orig2xz ansvr:4 nhg4vk7g3m da:w vg88 q/inal 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 spee,p*yb tdy/be i9wg4yjlu b :1:d of $v$ 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 rk58b.7yb+48 dn8 cz5gr tygrulyeh8 jefers 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.
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 scenar/*e2r,s( fbt me wv,g*badjh8lir8l,io: 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 fb +ipvk 8+bbm :kdc-9uollowing 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 t)jt3 qpzbuv 8+he 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 theh 6s.arhtl5 m* table edge. Which of the following would best rep*ralm6h5.t sh resent 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 reprexw40ud3n7lr2(pl :n u3 dr scgsents the relationship between distance and time for an object that is moving along a straight line. Whauund lwgc03rlx3 (p7rd2:s4 n t 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 disdfewlr(5 l+u0ouo x.9 dr-q+ ntance and time for an object that is moving along a straigh ul 90+o+5ro-xrel nq .dd(fuwt 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 ( 7raqljn m8pc;mde7)m h oct.he(s/; is thrown straight downward on Earth with an initial speed of 12;8 jme7c(t.cr 7mep ;m)nh(dqhsl/oa.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 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 (1 g pf*k6c5x b)l 5cbchf+e et2md6gbstarting from rest and uniformly accel fed c5xtblh1)g2( 6meb+ b6cc f5kgp*erating across the floor. The time and distance traveled from the start are shown in the diagram.
What was the average speed of the cart between 0.1 seconds and 0.3 seconds?


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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.12: The diagram below represent.-h(:vsqiyj ksd:zm o en17t+ s a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from t::dnqs7 v .it zy(moks -e1+jhhe 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 0j)og ubzkminr-0g8 20jsww5accelerating across the floor. The time and distance travel5o mj 02ggrjibk 8)n0ws-z uw0ed 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 aco5c o9 0zvykok -qj37a,jbk ( uniformly accelerating ball. The position of the ball each second is indicatedco o9ck5j(qkkvay7, z-o j30b .
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 positbr61-l habfc: y9/ ufsion of the ball each second i/cf6y s9 :1a uhbbl-rfs 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 unicycle moving in a stra9m1t1ej76y sbm8kg xn ight line is shown in the graph below. g7m1x6tes 8n1j9 mbky
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 *sflp1 s883 ;wa l v t9jc5y;lxyx5tgsunicycle moving in a straight line is shown8cfx 39llt*5 1; ;sw5sg8tajyxys vpl 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 v *vgp f* 7*z( amohm odgoq+yc-o;)j+freely in a vacuum near the surface of the earth

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.11: The accompanyi yquf2v-ei-7x4x,f jwng graph describes the motion of a marble on a table top for 10 seconds. For which time interval(s) ie-vqf 4 x2fuxj,yw7-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 gxf1srx-iy7,(z wy 0 f3a6lacas2tv3c raph describes the motion of a marble on a table top for 10 seconds. s2 x,faacxiw31yv6a0 zrtc3y s7-(f lFor 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 graph describes the motion of a mar *lw y7t:stc mllb9k*/t7/kihble on a table top for 10 seconds. Whm*kit97tltkc s b /7w: /lly*hat is the marbles 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 a time o ouq4thzxqw 1/21r*h sf $2.00\;s$ 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 of bq4 5c8xnlxpc 78i0ryg:vw/z13md tu$20.0\;m/s$, 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 graphbfd:vtq(i+u 7s could correctly represent the motion of an object moving with a constant speed in a straight line? dtb7iu (q+:fv


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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 across the ft:(;f pif+mjbdlt h-2 loor for 10 seconds. What is the acceleration of the toy ca2; ijfm-l(ftb:t+p d hr 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 describes the motion of a toy carg r7;j:q0b uvh)g0bdt across the floor for:;dbgj gqu7vht) 00 br 10 seconds. 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 describes the motion of a toy car awsg,pk ro;m3 +cross the floor for 10 seconds. At what times or time intervals kg3 m;rpso, w+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 ; d .dew/gf5bcuniformly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best represents the acceleration o gb ;fdc/wed5.f 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 versubb:gnar*-5vjzn -+ptg p)a5z s time curve shown. Which of the following statements regnv- g pbrb+nzjz5gaa* -tp:) 5arding 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-axis8twxc 7sm//4+cdc4b,lkrdt e ;grk)w according to the velocity versus time curve shown to the ri;btcm/8x ktl4 cr,c/) d 7+rgewd4skwght. 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 angle betwv 04ojye9 pj4teen the velocity and the acceleration of the ball is kept at a constant 120 det49p4 je voyj0gree. 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 apaji4vbd6h 6/x9w7 rdwtrt and traveling toward each other. 4iw/jdbrwtxhd 76 9v6
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 o ej oabr:;.ldg-d ;rdmg;;+gincreasinrgm ord+;:dad;- belg;g.jo ;g

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.12: The definition of average ve: .nry0vr 9pca3id kh -g fh,p i5o6*wxb04nselocity 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 nn-+ydybspt/:dwp8zm.a 1 h 63 prg.z one of the following choices identifiw gm3+ .p 861n-t:dpznpbzy y.a/rhsdes 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 move47lr78pukz: jbrut c;0sybz,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-tim jwiiz4 wjf6,cxz/* .ae, $y\;vs\;t$, 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 t;246fz9 uvkz s/h i;gn7azl- rxwvfa 6he right along a one-dimensional track for total time T in ff;vw 4x9zsrv7a6zz-l/i6; hn gk 2autwo parts.
• Part One: The car maintains constant non-zero speed V for the first $\frac{3}{4}$ of the total time.
• Part Two: The car accelerates uniformly to rest during the last $\frac{1}{4}$ of the total time.
What is the ratio of the distance traveled during Part One of the trip to the distance traveled during Part Two of the trip?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.23: The velocity vs. time graph for the motion of a car on a straight trxiym 9rhg 3aqbs x58l 66i*l2qack is shown in the diagram. The thick line represents the velocityq2xaq l96simry i8hxl* 35 bg6. 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 slxqe ecsgz+/t g wh+ (7x 4r2xrb429nmotion of a car on a straight track is shown in the diagram. The thicxl+4rneb2xz 492+ ggws(qes xhrc/7 tk 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 moti5)vhkx(sa, u, f 9wly+vd:d 2md2p ufdon of an object given by the position vs. time graph shown. For what time(s)m+ (vsvd5flufk ayd)x 22d ,h9d :,upw 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 motio jp6iioq1o3 lhp 1g5lhpe43 z5n of an object given by the velocity vs. time graph shown. For which time(s) is the accele 15gl3p 5i1ho h6 3opzqleip4jration 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 th+,uy.tn 5s gnne acceleration vs. time graph for a fixed time interval of an object’s motiog.s+t ,5ynn unn, what quantity has been determined for that object?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.08: An object moves along a horizontal line with increasegqeb k2*4195d azbfzing 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:8jr5f,8xao)ufhknk :nwvih9sy6 -c in two parts:
Part 1: it travels a distance of 800 m at a constant speed of 4.0 m/s.
Part 2: it travels a distance of 1200 m at a constant speed of 20.0 m/s.
What is the average speed of the car for the entire two-part trip?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.02:A small object is released from resr1x 4+cbl7epnylt0 h.t 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 r j7)z:2wuw tyrest 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 gv07jr0 sgxb0 sraph of a particle moving along a horizontal axis is shown. What is the total distance traveledjrx 7bs00g0v s 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 folqv-r60yfe sgma/d+: clowing choices correctly identifies all of the listed situations for which there is a non-zero accelerd:f6m0ercs+-g/vaqy ation?
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 moz5se:m )t o01qo n rjr.zhe:6sving along a line is shown. The object sn 0) oeoh :tz1m .qrjrs:5ze6starts from 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 origin and its velocity along a line vsi:q rsh 9d1 4ofqzy:3i. time is grdq91 zhqy i4s3io: r:faphed. Which one of the 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 on a horizontal track, each with constanh ,(sp eb-d s4z wyvfge2/96kot acceleration. At an instant of time, the ihw69yzs e/2kvsfg,bd4 ope (- nformation 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 positi;* zujyxu::teq 9-w exon $x$, 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 jlyh2yrd:6w 2 d0d 0jjone of the following choices correctly describes the j wydl06rd0hdy22 j:jrelationship 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 followicrkoxy j (9o,pw/c9/ dng choices best describes the instants of time, at which tkodwjrc/(o 9,x 9cp/ yhe 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 oritycu;/ x.o ;flgin and will move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the following choices correctly identifies the relationship for both the spetox;;. fy lc/ueds $v$ 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 5jy-8yib i38x af chb6an object moving on a horizontal line is shown. At what c8-y3j biax8ifyh5b 6 time(s) is the object moving with its greatest speed?


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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.08: A mass moves along the x-axis following the positions3ft 4kp h5/g: x;s-wkevyb7 w vs. time graph provided pwg3w5 xsfse k-4b;kv/7thy: . During what time interval(s) does the mass have zero acceleration?


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