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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 path oft2tqejj cs1-)gp: v1a 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 wbj.gd p/0ksdo; x:t2pe /j b/pithout reference to a particular direbx;jg p :t dp bps.2/ko/ej0d/ction 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 compler4rhv7e3/gmyty1,y g iwnqie 3 9j o*u/93ozptes one lap around a circular track at an average speed of 50 m/s and then completes a second lap at an average spjg,oi4hg/w yir9y33ur v*t 1 /mzqno7eeyp9 3eed 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 0.8m;)qv,g u ,p*8 uotjpth; pq,y0 m in 1.0 s at the constant velocity. If it continues, how far will it travel ,qo,p ,u;uyjtp8*;htmqp g v)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 stati y ntt* 93jhmgf*ud83aonary on a 30-kg plank that is sliding at 5.00 m/s to the right across a frictionless pond. The boy then turns and starts walking on the plank y8 gmdh9 u3tf*atjn* 3at 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 kmluh mk718fn/k zig z)6/h and 400 km at 100 km/h. What is the average speed of the motorisi8 6m) z k1lh7kfguz/nt 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 trol2oo 2 x8pd n5v31xrsaveling along the x-axis. The graph2o s 1 52odxnprl8v3ox 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 icofs1tx3 o),a toy car traveling along the x-axis. The graph shown below is a plot of x3ioft,oc1 )s 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 rtiuj)s g,u /t) :tixe3n4a f5yefers to the motion of a toy car traveling along the x-axis. The graph shown bee a)5fiu3,tuttyx:jin) g4 s/low is a plot of the car’s velocity in the x direction, $v_x$ versus time $t$.
How far did the car travel during the first 15 seconds?


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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.15: Given the graph of the velocity vs. time of ab*w p/j6by 25duz/k m-qkrni8 duck flying due south for the winter. At what point didkjq6um8 -zr *wpby2b n5d ik// 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 below which shows the position and e irnfm0)m5t1h lapsed time of a car starting from rest and uniformly accelerating in a straight line. What was trhn tm)5 1if0mhe 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 dim+7:b(r/ nmscz vksix*ie;: d agram below which shows the position and elapsed time ofrm;cn:s (z vx/+sei :id7kmb* a car 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 f1j(3f (xy2xj+oavkc velocity time graph for an object with the position time graph shown in the djc3f(2+xo1a vjk(yfx iagram 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 quest(8.5on4 i m9uu/p7..whord 1 szuynme(jcsxoion refer to the following information. An ideal elastic rubber ball is dropped from a heightsd5 1oe.(7 nuo.x.j8uw soy/h cnri9 pm(z4mu 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 txhbj:7jlttrb7g0 m2 tb.i -4ro the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and re.r7t hb b jxrj tb4:ml-i07g2tbounds 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 spees3 b/ pkd:ns3f)l mbyh5m8yvb*5d s9 xd 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 refers to*dhe (97otjqqya p*/jxg j2p; 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 scen3g .hk8 w )ho/m9hyjgnario: 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 scenario: Atvz 6xp(p x30ca2e8x tx9dvcu* $t_0$, 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 following sz2*n jx4dmj;p cenario: 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;6..vhn xr-cxo wmpg)0hyd)o 2c 3eo a79ptto top and off the table edge. Which of the following would best represent a graph of the magnitude of the ball's acceleration vcoc0mtp.9toopy3d )7oxvh6a-.; w)rnxg h e2s 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 and time for an obq , sw,ivf6i0dject that is moving a v,d0f6,isiwq long a straight line. What is the instantaneous speed of the object at t = 5.0 seconds?


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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.02: The graph represents the relationship betwe4gb3e0zz)s 2y szjz5c8m q5qlen distance and time for an object that )zqcjse gszmb3q0yz 85 l452zis moving along a straight line. Between what times did the object have a non-zero acceleration?


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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.07: A small object is thrown straight downward onhwar ni;/+v 9f 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 9rwvf /niah; +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 starting frtou)x-y *gtm0-ig6q: xlyt0b om rest and uniformly accelerating across the floor. The time and distance traveled * q6-y: ogtx im0 byt0tgl-)xufrom the start are shown in the diagram.
What was the average speed of the cart between 0.1 seconds and 0.3 seconds?


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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.12: The diagram below represents a toy car starting from rest and uniformly vg dzp+6 ,zzs1accelerating across the floor. The time and distance traveled from the start are shown in the dia vzzs, 1p6zgd+gram.
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 belo;dej di5en8 /*a kt kbo2hxp;;w represents a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the s h; k bd;xidntk8e o;/jep*5a2tart 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.11e-;fycr8z +zpyd en The position of the ball eachy1zycend er-+fp18; z second 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 unifor1huug.dgd+i)q c6dq2*rx d o( mly accelerating ball. The position of the ball eac .1)dghio*rq+xdd gdqu2( uc6h 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 unicycle moving in atzs pvrv o*7f l5ep+jdi,98z 1 straight line is shown in the gra57szpjidov 9pev,*+1 8r f ztlph 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 augl rsqo.y59 f :+ t/jsai4* ex4ps;aq unicycle moving in a straight line is shown in the qg9+y5p4s: exiru ajat*l./qf o4;s sgraph 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 tb0 euj dj8fmmrj; -2g/he 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 descrioka l4/rx ub 36lm+j: ewr2e5tbes the motion of a marble on a table top for 10 seconds. For which time interval(s) did the marble have a negative uw6te2j3b: ao l5xk rr +l4e/mvelocity?


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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 th jumpa,zpq,i5gedr.r 620a 1h e motion of a marble on a table top for 10 seconds. Forquamr2 ,06rg jhep15 z,. pdai 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 moti ylixt/+id vje- 5xe1n 1a5)dwlxa8;pon of a marble on a table top for 10 seconds. What is the marbles average acc-yv 5 ix8 +teixa /leddpj5lxnaw1 );1eleration 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 uni+6 r0e3esso ngformly 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 m+baz3uru*k 1straight 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 correctl3xmq m,r;iijizjkl6/7 pxc 0: y represent the motion of an object mji x07i:r ;p lqzk,6 mj3/cximoving 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 across 8gf3:2-r: *g kx emlob9cczgl the floor for2:gfgkm-lecl o9*8 zgb:c x3 r 10 seconds. 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 describes the motion of a toy car across t2e4 nlg z3fpsk9h;jkgyui3 , 3he floor for 10 seconds. What was the total displacement of the toy car fore9y2hlkj4fk3zu3n,3g ;is gp 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 ah0a kw:lcj+:h.al, nkvxn 9h;cross the floor for 10 seconds. At what times or time intervals m j9vwnklk:hh.l0 ; x:h,c+ naaust 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 6. h d0iuff(vd60 km/hr in 4.50 s. Which one of the following choices best represents tu(0dd ifhv .6fhe 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. Which of the following s,wkc cva8ae 32-qnu/n2hm z- ; ko4dagtatements re8wnz-/ ;3vk,ema 4 2 c-gq oa2knauhcdgarding 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 mov5; 2uan zecjf1es along the x-axis according to the velocity versus time curve shown to the right. When does the car jecu naf2z;51have 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 int),3q .y q:(unsxhm xkcerval of time, a tennis ball is moved so that the angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true 3 c)yx x ,kqm.usq(:hnabout 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 travelin*h(*tm7tu vs qg toward each other. hu*sv*t7 (mtq
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 the9ius)) wsq.er acceleration is positive and inc9)i)s qr su.ewreasing

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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 veloci*0age/ht+ta7 6*dkwjjn 6(iq4 l 0howa mirt6ty 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, whic ; uugwk*lv6l+h one of the following choices identifies quantities tg6 wu+uvl* ;klhat 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 movei9nt2bc(y :ev;0yhog 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- a 8hq/+hz( bkra3+dbwtime, $y\;vs\;t$, 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 alo9eae1s:puhvf5tv p 2b zf g,97ng a one-dimensional track for total time T in two pa7a9tu2bfz9gh vs v,pep 5 1ef:rts.
• 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. 6/ 48nkye a5 qj:xvltqtime graph for the motion of a car on a straight track is shown in the diagnx v q64kj tl8/ye5:aqram. 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 gr:l z4w jclp)t1aph for the motion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that the car starts at originlcp1:)4 ztwlj $x=0$. 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 obje3pv 0n0x2gi*tra* osc:xqv,8 mnwve-ct given by the position vs. time graph shown. For what time(s) is the speed oq,m t0g:3e p 8*ovx* cwaisnnr xv0v2-f 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 velocity vy.cme32ki;nw2 o kux, s. time graph shown. For m2yink 2k,uc; 3w.oex which time(s) is the acceleration 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 - iqe0nv;iz91vw jq+runder the acceleration vs. time graph for a fixed tijqw q9vnv-zi i1r;e 0+me interval of an object’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.d 67p69ke b xxah)ww0u
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 z e dyqkrxn69k0di,3a )ves( -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 al *hi8tf5s+urest 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 and re*4wyot:s dbg:aches 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. ndn1 d0lk v bfr )q9g6yo7bj(1time graph of a particle moving along a horizontal axis is shown. What is the total distanvf0( 9 ygrl dnbdjk1)q 1b67noce 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 corr)xjxpwpvp4q zq7, fm:wlms8b )eo6 :,ectly identifies all of the listed situations for which there is a non-zero acof 8mmxqv,x6 p: l4szepp: b,qwj7) )wceleration?
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 mov w2l80 l( c.oeum2sjwring 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 eum2wsr8.l0( lowj c2 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 velo1p7s 1:cgwo)o b ynp.o+i s7ndea wd)t-+avy/ city along 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 mp sc-eg :.a+bdno/+pa)os wi v ywdt)o17 1ny7oving 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 y2m5( sbn.e,wfz9;5m n dcqkhto the right on a horizontal track, each with constant acceleration. At an instant of time, the information about the cars is shown: 95czsfdn5w .k;m nbeqh,( ym2
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 ml0uoku-bk 7;a 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 time sho5 u xu(fre dt oe/3kuy,v)6gj0wn in the graph, which one of the following choices correctly describes the relatrj(fdyvgxuet36u 0ko, 5e/)uionship 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 following choices best describes the insta sp:wk:d6 6donjxcn*77y s/lbnts of time, at whickc:/bs o*pxnny7 66jdls7:wdh 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 Qb1vozp3j- j 5xsp)0db, each start from rest at the origin 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 bo pp53zx) 0j-vsbb1d ojth 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 g9svf 7n3*reza l68h /qyf;ztan object moving on a horizontal line is shown. At what tim6az 7v 8frf *9qz ;ny/tsleg3he(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-axir hu-w dfz13.es following the position vs. time graph provided. During what time interval(s) does the mass have zero acceler3f1h rwd uez-.ation?


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