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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 of radius w1*+* i(gqkp s2scusm $R$, 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 tow ddxg/kch 4g1 bp536n a particular directn/ h6p3dw k154g bgdcxion 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 comple y:ra an;.--2 ..w hc-(phsx edaxeleites one lap around a circular track at an average speed of 50 m/s and then compl leydc2 -xe;-(p.a-wxeh.r iasa. : hnetes 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 thbj 4i.n(b8)tps -bpl,b sq4ose constant velocity. If it continues, how far will it travel in)lpb8t pnijs.,bss44b (-qbo 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.vd 17k2e ;zii;9 vjotl00 m/s to the right across a frictionless pond. The boy then turns and starts walkintzj1l ; k9i7o e2div;vg 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 travels5 8 gqiuae6t rgs y5c0;he:j0d 400 km at 80 km/h and 400 km at 100 km/h. What is the ave ;igqr0s gc0:eu 8ayhjt5de56rage 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 refersjqck0s0g 4n c* bp+xcur3d+1i to the motion of a toy car traveling along the x-axis. The graph shown below is a0cns b1pi4 k c0g+r3dx+uc*qj plot of the car’s velocity in the x direction, $v_x$ versus time $t$.
During what time interval was the car moving towards its initial position at constant velocity?


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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.21: This question refers to the motion of a toy car traveling alo0k0l jz cxvi ,b1 4c+ihmu,6shng the x-axis. The graph shown below is a plo lmvzcu, c+6j4kb 00hhxii s,1t 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 travelin1o0 bj c6jwm1ng along the x-axis. The graph shown below is a plot 1mo njjw1c06bof 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 veli1ipzas*i av)sp w-),ocity vs. time of a duck flying due south for the winter. At what point did the duck stop its forward motion avii*iw)-p s),pz1sa ?





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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 a;qqr 4 b:swqzkt;2l z5nd elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the average velocity of th2b;wkl t5;z4qq:z rsqe 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 thpo;yp;i c1 k0o the diagram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleratiokyiop h;1;0cp n 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 oqxbfe :u*ei4e7 a +5s8dbbf3sf the velocity time graph for an object with the position time graph shown in the diagram at rightse8b f4 fxeas+ 5*b7ied :u3bq?


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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 re)kl orf5 eq):ufer to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and :efql)ur)ok 5rebounds 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 ide tyy*zfvzsk t:,:*u-pal elastic rubber ball is dropped fzk t: ,-sy*tzp*vyf :urom a height of about 2 meters, hits the floor and rebounds to its original height.
Which of the following would best represent acceleration versus time for the bouncing ball?


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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.39: If a boat can travel with a sp:yk;p6cqo(ttgo:5g leed 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 the following scvtaux5 nz*ckj 0r/+ lj3/2ieuenario: 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 refer*9mfw c ikfnup 3ngr4ojj8o: 9+mn *z,s 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.
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 scenax qzr,.y+1qgn rio: 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 / n)iuhpwhncu8.*8msthe 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 rqb7 /q dy(;0*wd7ljpm rmn)v y) xmc0kamp, across a horizontal table top and off the table edge. Which of the following would best represent a graph of the magnitude of the ball's ac7n;/ymbpcqmldjw rmkq0v70xy d) (*)celeration 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 represegp*9y.x bf 3mtnts the relationship between distance and time for an object t .pbx9*fm3 gythat is moving along 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 between distance and time for a1m01 i p ajdfu*y4 h:8 qsrgx-ox.13m3wnwjcin object that is moving along a straight line. Between what times did the object have a non-zero acceleratio fau ix031x84wc q1o j3imy-nd*g .1hp:rmwsjn?


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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 downwart6 mqgoure-o)df ccp7171. ewd on Earth with an initial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resi7 eurwqpo-c1 tf)671cmgo . edstance, 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 slqhmqij 6 hl:bd/ ,;-3*ejyactarting from rest and uniformly accelerati;h*edh ial/6cqj:jmq,3l y-bng 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 belowj( b 1zdew,b3 rrw2xn( represents a toy car starting from rest and uniformly accelerating across the floor. The timerwzdewnjb32r(( 1x ,b 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 represr,(r7p6ww uc;:s upwments a toy car starting from rest and uniformly accelerating up m7wc,p6us(wrw: ;racross 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 accelera/g; zje3t 3wur gi3v-tting ball. The position of the ball each second is i tj3tr;/i zg3v uwge3-ndicated.
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 showt,c5*;(jdes i9 t kfxis a uniformly accelerating ball. The position of the ball each second is ii5(,e;s*9xt i dtk fcjndicated.
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 inv/ko e *7jy; 5myi invsg.n6+s a straight line is shown in the graph sn/soiyi6 y; v e*g7v.j+nm k5below.
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 unit-w x:rp9jdoj 5h 3s2scycle moving in a straight line is shown in the graph below. rs5dj jho2-xp:tsw93
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 surf/5 t,p ld5+cizchkm i3ace 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 deverw 2 y*4wmnr76nv1iscribes the motion of a marble on a table top for 10 seconds. For which time interval(s) did the marble have a negative ve1* 2nwivy m7vrw4rn6 elocity?


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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.l: gd2t ,jq.b2r kqlk5vi5hm of a marble on a table top for 10 seconds. For which time i2mk.ltvlhb5, jq:k gi2 rq5.dnterval(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 dedlmsu4 *gr tt09 eg*x6dsl)b+scribes the motion of a marble on a table top for 10 seconds. Wh)4b9xd sglu6*tes*mgt0d lr+at 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 rest2932q 7 gvmb63 auv fnsch5xgb 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 re-ilqrqu)-)0)ub bi15v ol tdownward 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 the motion of an e1c(qehw0 lz4 object moving with a constant speed in a strai14c q0ew lez(hght 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 .i ;tusb n3s4mthe motion of a toy car across the floor for 10 seconds. Wh.mt4usbsin3 ; at 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 wkec.gs,/ fvb/a* 2n qa toy car across the floor for 10 seconds. What was the total dqg k/esab 2. w*/cf,nvisplacement 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 acrossbll,8er*gwm ( the floor for 10 seconds. At what times or time intervals must the net force on the toy car be zero?l *r (w8,blemg


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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 uniform//+xa9e zpwilcb w)q*ly from 0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best represents the accelerationl) exbz*apw9/+qw ic / 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 vec2jht mw258/ybs 0txflocity versus time curve shown. Which of the following statements regarding its motion ishb/stmwt85 x2y0 cjf 2 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-ax 9z0zc zfsi)z)is according to the velocity versus time curve shown to the right. When does the car have zero acceleratics)f0z 9izzz) on?


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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 betwr3uqm: t+0fc mv5 u4bieen the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true about the tennis ball during this interval of ti0: tv4fu5iqrcmb m3u +me?

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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 kilomeky+ l+kw rrib;,wlq1 7ters apart and traveling toward each other.w y +1rk ,qlbikr7l+;w
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 move*sbf. mbjbc ujr((.ci-n4 )k zv/z k7civ :im*s on the x-axis. When the acceleration is positive and increasing*n( :fj7rimvc)4bvbz.b.cmk i(-/ki *c usjz

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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 ib3.j )v8or;tqtj :p daverage velocity is

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.18: For any motion in two dimensi-i1kh1zlkq ,z9f0ts)9w /o6prnurxn ons, which one of the following choices identifies quantities that must have the same directisrf 91up)r ,6q19nto-0i zn zkk xhlw/on?

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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 +ryuwwp0p+a cze q5rai5-; 2w$3.0\;m$ 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-tphkqy *))y) kmk5 iam5 s +3ur:jvh9kyime, $y\;vs\;t$, 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 q ayd)vj1* (/nue7gej a one-dimensional track for total time T iqugj*d e1n7v)j/ e(ya n two 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 straiggs z7jhe4* i99lx: oav1n1fmp ht track is shown in the diagram. The thick line represents the velocity. Assume that the car starts at origin4z1mep97a9x1j h*f nv :ogsil $x=0$. 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 straight trk.pbj+x:o o5p1po1tl)t .dz qack is5d.)ot qtz.1ol+o :b jxppkp1 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 of an object given by ps8e;8 8a(er)kihelm the position vs. time graph shown. Fpsh;)8m8lre(8 keiae or 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 velocity vs. time graph sho9bmy*b y 6p8vswn. For which time(s) is the acceleration of the object ems*9 8y6pvbbyqual 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 the acceleration vs. time graph for a fibjs; d +;jkdv-4 n) ,z-;dsqiwwnio;m xed time interval of an object’s motion, w ; bz4sk dq;nim) siow; v-;njw+-jd,dhat 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 increasiie: lna:w k1:qng 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 tr,:y8 amsmc: :xwr/ksrip 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 r 7fxl7ym9/ mtduye2p4r6fc o8c k11qa est 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 reaches w z:oa6wll3.athe 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. n3rvgbr/i 1,t/yjv, ztime graph of a particle moving along a horizontal axis is shown. What is the total dist/gvz,31 rn,tjvb iy /rance 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 follo/ u2.2ycy ,xi7 smzm y iwit*0ga1xz.3 (decwowing choices correctly identifies all of the listed situations for which there is a non-zero accelt( wym.a1c,w*x3mz cs7 y2ye2iioi / zdu0.xgeration?
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 g: v5ji/4fi.q tv huwl- fb,8lsraph for an object moving along a line is shown. The object starts from rest at tv/ q ,isfj.:4tlfhv5libu -w8ime 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 tbgz bk81 zhd-8rq lppwd6p)0:he origin and its velocity along a line vs. time is graphed. Which one of the following choices best gi 68z z :kpp d-pg1hqdb8w)0blrves 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 +-sp. q248 ne3lkxr zorabeh2horizontal track, each with constant acceleration. At an instqh2s4 rz bpnea3k+o.2r l8- xeant 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 d+nh09m fwo p9q/)cbz-u(9l:jby*b vpbh b 4ma 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 shown in thlw79ax2voc s6e graph, which one of the following choices c9lso6avx 7c w2orrectly describes the relationship 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 descri iq*ltb )0vjuuwq:l8 +5do;htbes the instants of time, at which thev o+dwqu:8tl;jq*blhu t i) 05 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 resta:pim 1du:.s h at the origin and will move along the x-axis. The acceleration vs. time graph for each car is shown. Which oneih:sdm pu:.1a 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 horizontal livo/ zv4),od ftmfe5 l 0ck6nk,e75ghw ne is shown. At w,kvmfo5vg)5,/kto le4hzc n0 e6 wf d7hat 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 position vs nhp;2fvkrol+.a 6w, p(9 hzkn. time graph provided. During what time ihrnfpoz+ ; nahpk,lw6( v.9 2knterval(s) does the mass have zero acceleration?


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