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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 uley)udi zhr:n, s:8 )rqm.)a at a constant speed around a circular path of radius $R$, if the particle makes one complete trip around the entire circle, what is the magnitude of the displacement for this trip?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.01: The change of distance per unit time without reference tuju7d;qm5u(mif(++ *)v0 pw ysvzeb-depo s 8o a particular dirs bj -p5 fwu)s++ eq(me0p;8udovzy 7uvd*i(mection 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 0nydt yexeb q-o(d7(7at an average speed of 50 m/s and then completes a second lap at an ot- een dq(d0y77xb(y 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 veloci*t k +et m5nxeiivt ,29kbca++ty. If it continues, how far will it an etv* 9bi5x2+mt+i+,k ekcttravel 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/ c0q+rppi1**msz i ao :fasl)0s to the right across a frictionless pond. The boy then turns and starts walking on the plank at p0ciaaf1*+r ps 0s i*)moz:ql 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 travelh ng4yw7dl0b:xi- e5ls 400 km at 80 km/h and 400 km at 100 km/h. What is the average lxne0w5y - b dlh7i4:gspeed 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 thtvb2:m tw7 1oce motion of a toy car traveling along the x-axis. The graph shown below is a plot o: bom ctv17t2wf 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 x-a pl 1waez0 .gorr7(p8hxis. The graph shown below ho7pr z.re(wg 0pal1 8is 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 traveling 3 nksjrzgzn-4(8v)sf +gdld5along the x-axis. The graph shown below is a plot of the car’s ve g8 4+s zlrks-jdg(zv5 3n)dnflocity 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 )8s0k ;4etmnktme 9hsduck flying due south for the winter. At what point did the duck st) 8nhm0es kkte4ms;9top 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 qu9; ( ()ha;zlwfj,dnoe y:lyrefer to the diagram below which 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 second? yf;elhwl j:oy)az u,q ;9nd( (


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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 shtd iqcick9*9 5ows the position and elapsed time of a car starting from rest and uniformly accel*ccq9 kidit 95erating 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 graph for x9uyjd 6v*.8g6 ;ho )vqd8kzxoys y2ran object with the position time2ruy g 96vdqvydx s y jook.8z6h;*)x8 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 information. An5 a6-3 (p-ryemm whm1glx4hhk ideal elastic rubber m hmkl(65hwm3e 4-r -x1apghyball is dropped from a height of 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 follow n/itlf (jz*,cing information. An ideal elastic rubber ball iizj nt*(c l,/fs 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 travele3d*v(fru 8ax v5 *nfl with a speed 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 refk-z88qq+iqi ;;s x pbgers 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 4ig vb g9q/-z bsk+y/c3jq+me 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 refersxn(+cf90p -tgo yhiwjmv:ge6* y a,: d 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 thfr yz v156tihy.rxr-x678 4*;gywiqamfag;ue 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 dcc+pna)oby1 5i* *wframp, across a horizontal table top and off the table edge. Which of the following would best rep)dbpc5c **o i+f nway1resent 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 distanc -8wq8bv7p fqmy:x)8vj7 .wu q2rjmobe and time for an object that is moving along a straigv8 q8jb f8qu -q yxrjwv 7b2ow):.mmp7ht 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 dis pp8if1ihn)d3spg5 : idlvr 82s e/:patance and time for an object that is moving along a straight line. Between what times did the object have a non-zero di1):3gpp:e28p a pl5vrfn8 d/ ssihi 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 with an i g+4wra;ifih,mw0 r/nssim 2, nitial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air ,2a0gimwn,4 r+i/iws rhfm;s 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 startingu; n8h 0egfm4y from rest and uniformly accelerating across the floor. The time and distance traveled from t0mh8; g4fe unyhe 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 todcnflo( na*q,4 )9qj sy car starting from rest and uniformly accelerating across the floor. The ti*9jdfaqcn4 ,n)soql(me 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 rep.2nezxv 2oxmt55 h zy 4ks4o5lresents a toy car starting from rest and uniformly accelerating acron 4t2xs zeo4z5hvo25. lkmxy5ss the floor. The time and distance traveled from the start are shown in the diagram.
What was the instantaneous velocity of the cart at 96 centimeters from the start?


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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.08: The diagram shows a uniformly acceler1jyz 7uf-ky0d m+qca+tcn9 v/ ating ball. The position of the ball each se d-qt ayvczcfmn 1j/y+ +0u7k9cond is indicated.
What is the average speed of the ball between 3 and 4 seconds?


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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.09: The diagram shows a uniformly accelerating ball. The position ofxh6d 1qb*i-kqdr6e* y the ball eaxrdq6 * -ek1y ibdhq6*ch second is indicated.
Which of the following is closest to the acceleration of the ball?


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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.17: The motion of a circus clown on a unicycl2igwa;(-5wyih 4 xtzje moving in a straight line is shown in the graph belogziaw jyw52;x-t4h (i w.
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 straight li-7 dj 8rv d2lqig7wtc8ne is sho8g7w2q -cdrl vd 8i7jtwn 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 surface of/jisx zz(qhee u*/m/k5 g8e8h 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 motiozg.7d 9nfg/ pun of a marble on a table top for 10 seconds. For which time interval(s) didz ndg/pu7 fg9. 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 marble on a table top f 5a9gii9izs.yor 10 seconds. For which time interval(s) did the marble have a pg995.zy saiii ositive 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 grad6(bebj 13yk*wbl fz1 ph describes the motion of a marble on a table top for 10 seconds. What is the marbles average acceleration between t k yf*d1bl1 (zbjw36be= 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 of;6 xg tap7crni3.z0r5t fw4of $2.00\;s$ 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, throwwf7z 1.jy(luc n straight downward 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 could correctly represent +9x t nkbd6kr)jul 7)ythe motion of an object moving with a constant speed in a sdb)u)x67ly9 r+nkjkt traight 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 accompanyin.k39 .u5bdv6j kqvulvg graph describes the motion of a toy car across the floor for 10 seconds. What is the acceleration of the toy cu3uk5 q6.v. lbdv9j vkar 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 toy03 ru7yqc)exp . d9kpy car across the floor for 10 seconds. What was the total displacement of the toy car for the entcur0) eqykyp px.d39 7ire 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 acrosb6f z/ve(3 vqws the floor for 10 seconds. At what times or time intervals must the net force on the toy car bezq ebf6 3(v/wv 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 unifor,dki*/c5otuy mly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best represents the accelerady ,t*o5c/ku ition 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. Whicxx,6s;a t:fg-)jjbm fh of the following statements regarding its motion is NOT CORRECT? js,-;f)x fgmbatj6:x


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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 according to the velocity versus time xwjknwkyejffnh4 89wg3* u/xv g()*4pqu n, 6curve shown to the right. When does the car have zero acceleravu9)8qfyk(k jp xn*g3/wnhj*ueg,w4wxfn64 tion?


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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 inter;s7cs)a6 jwtj val of time, a tennis ball is moved so that the angle between the velocity and 76)s was;jctjthe acceleration 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 traveling hqma8 0e0 fr-nqj5k8utoward each other.qmfeuak 8 n- j580qr0h
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 thhawk *:faly uwx3u wxpb h:25 b3s*+v:e x-axis. When the acceleration is positive and incrw x::+ ya*u hlbahkvw*ub 33sx f2pw5:easing

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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*9ovapb sy jl)nvc8 1fj ,,ce8 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 inrap 3; ,u8jyv*edi(ug two dimensions, which one of the following choices identifies quantities that must hav3py( duru ;ij8e*gva, e 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 vzxph 9q ep08t g- cv(78)xgss$3.0\;m$ 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-ta+ 0,+s, 9ljwbewxka w5 kqx cp+hj9h7ime, $y\;vs\;t$, graph for the motion of an object is shown. What would be a reasonable equation for the acceleration that would account for this motion?


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.31: A car moves to the right along a one-dimensional track gdg uj 2q6sft c,g7x.n+ws/:afor total time T in two g. g, 6q+:w aj dxnfg72scs/utparts.
• 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 5ri6vqphoi;i ( k yu v:ucz (ln)he684straight track is shown in the diagram)8 yiq(nvzi;(r45p uciu e6 6lv:ohkh. The thick line represents the velocity. 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 of a car on a steo)*tw d0 6rcf a6s+vqraight track is shown in the diagram. The thick linsdw qa+) *co0r6t6 evfe 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 th /dl3+lelp*o4tllv ; je position vs. time graph shown. For what time(s) is the speed of the o /l+;pl*td4j3 llvel 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 objeujo 1(k8x:*cv,h .o6zf7gplj g;rtkzct given by the velocity vs. time graph shown. For which time(s) is the acceleration of the object equal txlgco1vjrkz okh pf76 ;z.ju,g8:*(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 -qzxqyr 3kfx6f+ -ow67y(u bithe acceleration vs. time graph for a fixed time interval of an objectz+(k -6i6 -fb q 7foxu3qyryxw’s motion, 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 increasing speed.4 6c ,e9a 9h8qo3( az:uhqe gfd6yuiys
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 triz; zc)n rni/j4p 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 rest and rea-oaii:uj qduf zlf p6y+/*4l3ches 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 +o unpp3--w mgrest 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 axis zapu.vv.2 iz4 is shown. What is the total distance traveled by the particle vp zi.4 avu2.zfrom 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 7cy dj w-:g. 2den,nrtfollowing choices correctly identifies all of the listed situajye2tdw, : gncn- 7r.dtions 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 moving along a lin2 q0lak5wekaew5 29ncb b g,3ve is shown. The object starts from rest at time t=0 s. At what time(s) does tenlg5v 3wc02a9 kw2bbq ,k ea5he 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 anxkly;ho)3-: zv eqtl,d its velocity along a line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of time for w,oe:zh;k 3)yq tv l-lxhich 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 horizom2 l40olbat+r ntal track, each with constanm+aor0l tbl2 4t acceleration. At 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 position u0o2.+* )f2d* d(v ez;ahvq bvbskwu i$x$, 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 v;wm5dd .krede 5c(:iin the graph, which one of the following choices correctly describes the relationship between the average speed of the truck to tha(; m i. ddewrecvk5:5dt 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 instants of tild 3d elx** p3gck:aqo k87oq p7/yt)ame, aty 3px7dk7oc3pal:ld)a k q/eg*8*q ot which the 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 qwr) ;+pbwlb 74 qqu vm;ys /ox:-5pxtfrom rest at the origin and will move along the x-axis. The acceleration vs. time graph for each car is shown. Whic 4qwlbt;r /bw:u-qx+oym5 pqx7;pv) sh 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+kb y7.pzx.r71ucd mgnyd7cpzf* 7n3 horizontal line is shown. At what time(s) is the object moving with its greatest speeyx.*pubc7 n1nyc kdm z+r f7p7zd37g.d?


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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 the2km*a +mkr27hjls8yf position vs. time graph provided. During what time in87kj am+*rls kh2fm 2yterval(s) does the mass have zero acceleration?


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