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习题练习:Physics Bowl by Topic 2: Kinematics - part I General Motion



 作者: admin   总分: 72分  得分: _____________

答题人: 匿名未登录  开始时间: 24年03月31日 09:50  切换到: 整卷模式

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1#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.10: A particle travels at a constant speed around a circulx1fjzqt5q2wd: e ae18 ar 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 to a particular diunj1o*f )aosjf7 i5 +qrection is cuaiqfj +s*oo j7n1f5 )alled

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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 on7h.:3(ce ca2 c;h1o vmcdq6 zbk8wy yoe lap around a circular track at an average speed of 50 m/s and then completw o.26 qc 8ycve;hzcm:hc(7oyb da13kes 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 movttda:j8)5y sr7cox3wes 0.80 m in 1.0 s at the constant velocity. If it continues, h8ts:yjrco5dx)t3a 7w ow far will it travel 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/s tov q: 781fbc) )gprjmud 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, relative to the plank. What is the speed of the plank relative 1vr f) m:jd7cbq 8ug)pto 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 100 km/h. What is th lw3 w5)gv86hv itddg.e average speed of the motorist on tv vgw).l5 d8gh6d3withis 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 mokgin7i nge2p n4s0 n* u;f2xk.tion of a toy car traveling along the x-axis. The graph shown below is 0k7 4e ;g *n kufxnspinni.g22a 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 ts f omcma 4orq1un3611he 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 onrmua1m 41c 63fo1qs 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 trafc n3-/isg+nu jd e2h+veling along the x-axis. The graph shown below is a plot of the ca n2njhed3+ -fsgcu+/i r’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 a duck flyingnq 1o2w5ot)3d7 oh6fs nyd2hj due south for the winter. At what point did the duck stop its forward o25yj1hd td7s6)q3 ohnfwon2 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 mh -ib6wi78m;w2vx6ef:or5 zej7m t twhich shows the position and elapsed time of a car starting from rest and eim7 6;z7ijhobttex2 rwf m-: 5vm w68uniformly accelerating in a straight line. What was the average velocity of the car during the third second?


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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.18: This question refer to the diagram belz*dsypqa7 slmv1a -:.ow which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleration during the entire 3 second i.y-l1dpsz*:q m7va a snterval 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 70mnma j5to:x an object with the position time graph shown in o5x : mnmj70atthe 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 t 42kj3slok 7ejhe following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the k jos kj342le7floor 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 questio9u ufoh :gx*8vn refer to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and reugf u8vh :*9xobounds to its original height.
Which of the following would best represent acceleration versus time for the bouncing ball?


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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.39: If a boat can travel with a speed ognazkw+/ei-a (.z a5gt7; skrf $v$ 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 follow9/6b bgbkvwl8ing 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 rev-ff )qtf n5.o(qe hh-e2,ezl fers 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 ghw+0vj0ptz/ 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 thjk4jrk(i.p nmd1h.p7of 0pno28; bj we 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 rasn ;3dnk-ld7 wmp, across a horizontal table top and off the table edge. Whichnw37l -dd ;skn of the following would best represent a graph of the magnitude of the ball's acceleration vs time?


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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.01: The graph represents the relationship between distance and tim stmc4t anxn i(k1x) 1oig5p3z 6r,f9ee for an object that is moving along a straight line. What is the instantaneous speed of the obk5 efii1)pz (946c3x mr1nangxs,tt o ject 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 betweenay (44(8r* gur0jo4 w,goft hsn3scpq distance and time for an object that is moving along a straight line. Between what gy4hcaugf 0t34 r(s , (rw8o4jqps*ontimes 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 on Earth with an initiale k q )5;rnrk2c1jbj4w speed of 12.0 m/s frq c 1jbrw5 rk;njek42)om 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 represen,e o90) k8wfgsnv(4tdu -qca yts a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown in the di tw4 )ue vs9n,qygcf-d(0k oa8agram.
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 representrg.onjm8w5 q l1o r v:gnmo0pg*; .t1fs a toy car starting from rest and uniformly al:1g1w5.jmvgtpr8o * 0rqnmo .gf n;occelerating across the floor. The time 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 represe2q* l mnw5r:dznts a toy car starting from rest and uniformly acceleratinn2*: 5dlzr qmwg across 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 unifo 2 f09l;jucsvrrmly accelerating ball. The position of the ball e02s9 vjclfu ;rach 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 uniformly accelerating ball. The pfh(6fsl7lp +b qxd 9n2osition of the ball each second dfx + p(q6b9lhs7l n2fis 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 eyn +bli6 z,fna(6y k3on a unicycle moving in a straight line is shown in the graph beln,e+ i(3lyy bk6f zan6ow.
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 crz kdyu4,t;i0 (lw8ptlown on a unicycle moving in a straight line is shown 8wr4;z,iutp ltyk(d0 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 sur 3:c3wm rsasdaa*0sz, face of the earth

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.11: The accompanying graph describes the motion of a marble on a table topz+n em gwp/.ri2,5,x z+.qqfp l8fwyd for 10 seconds. ify q pf2.wdpew ,z/,8+mz +l5qg xrn.For which time interval(s) did the marble have a negative velocity?


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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.12: The accompanying grap+u5eqox* wzsz q osv2*71* pq0xr z+pxh describes the motion of a marble on a table top for 10 seconds. For which time interval(s) did the marble hqxuspzowqqxr e* +v*152+ so*zz0x p7 ave 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 accompanyiwj*o mu l+y5v,wtt0v; utn+6tng graph describes the motion of a marble on a table top for +o 56l ,tu juy*tmw0; +nvtwtv10 seconds. What 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 acceleratnh3i fcn4)3m59fo h fces uniformly from rest for a time of $2.00\;s$ through a distance of $4.00\;m$. What was the acceleration of the car?

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.06: An object, thrown straight dowo2b+reft3v 3d nward 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 rep)yafnyx)y c 7l1sus ny 1*ocdr2 5.-xpresent the motion of an object moving with a coxya y)ssn)2xrc1d pfuo.-n* c7 y5y1lnstant 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 mp5 c)-9h3o1h/(km q-y p *widainamfnotion of a toy car across the floor for 10 seconds. What is 5* mh(9)ic3nh nipq- /omwapay d f1k-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 toojwr e; 2x7rht8tdm8r c-ue33 y car across the floor for 10 seconds. What was the total displacement of the toy car for the entirr-uc ee tjmhw3d8r 873xto; 2re 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 cas2hlho f u9np0d;o qd;mw;8;qx 0w,f er across the floor for 10 seconds. ow 0 2 ;;9fdx;qd;w,8q0nsufmle phoh At what times or time intervals must the net force on the toy car be zero?


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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.03: A car accelerates uniformly from 0 km/hr to 60 kp4:u5krq5s q8q (lyc* aum/ ssm/hr in 4.50 s. Which one of the following choices best rqq8s auyr55cklu* pss : /4q(mepresents the acceleration of the car?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.07: A car has the pwl562 yej +bqsr3 77 miwu:sivelocity versus time curve shown. Which of the following statements regarding its mosp uwrwye j2mi+:i6s37 5blq7tion 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-axis according to the velocity versu6wpuac. 7 so3kjog9kitoed( oy. 2u// s time curve shown to the right. When does the car have a /7ui9todc uwyksj g2e..6o/(3poo kzero 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 intyx7hp+(5 qlmeerval 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 about the tennis ball during this interv 5+lp(xq 7hemyal 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 apart44x e;/n h cj 7xar*wpql-g4sm and traveling toward each other.4* l e4q7gac-hjx/xw4p nms; r
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 onyp- m2ux 59sqn the x-axis. When the acceleration is positive and increasi9 -52x pqsynumng

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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 averano6gg wt7 q8zv8oq* k)ge 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 dimensions, whi/wp.rpj1 hwo.4ns5t6; 8g wb m bn)nfach one of the following choices identifies quantities that must have the same directr1on5bgn 8jwm4;hn/twb.a). pfs pw6 ion?

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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 moveka,1twrw ,dcb2 ngbw d z( oz20m,j,y1s $3.0\;m$ 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-* hokb g8do4d9time, $y\;vs\;t$, 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 alo r) zzpp,i njp42 z0;i.:yftdjng a one-dimensional track for total time T i,z4di0y :2jfpinpz;p jt r. z)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 straight trl kv,q; 1tq9vu6l l(oyack is shown in the dqtvll,oyulkv6 ; q 19(iagram. 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 o1( gr*7lgt ed65hdk ibf a car on a straight track is shown in the diagram. The thick line representd*ie7 kg 5rd(t ghl61bs 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 the position vs. time graph sho-w2qo *b j h0lv*ag(dhwn. For what time(s) is the speed of the object greatelhbd- * g0( owvq2*hajst?


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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 giral1 -b abh0*zven by the velocity vs. time graph shown. For which time(s) is the acceleration of the object equal to 0labbhr*1- az0 ?


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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. time221c/ qu6 rqwtsdwvc6 graph for a fixed time interval of an object’s motion, what quan 61 2ct26/usvrcww qdqtity 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 withgpuf+7eju zc* *it ;2u increasing speed.
choices could represent the signs of the velocity and of the acceleration for the object to achieve this motion?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.14: A car makes a trip in two part4jm 7rg6sln;ok13 mams:
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 resqsg zh zmz, tjzvq*5:w:dy4;1t 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 b5mm)(7k pf ytib+z0grest 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..n6uj ;sz :fs(js 7cyz time graph of a particle moving along a horizontal axis is shown. What icujn.;6f :7 (ysssj zzs the total distance 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 follyd tz;v41ypfb5 ld 2+uowing choices correctly identifies all of the listed situations for which there +f5 yltvpb dzd42u ;1yis 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 a dg3fq:e)tidbn/;. hen object moving along a line is shown. The object starts from rest at ti)ih t/ dgen ;:deqbf.3me 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 tgz 2cmjumps6vujfguh; 6)d :, b/g *6zhe origin and its velocity along a line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of 2bg) *v6pmuh:/ ufucj sg;dj zzg66, mtime 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, ea(on c;xilco93ch with constant acceleration. At an instant of time, the informationc;nc 3lo(xi9o 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 posvh8 u zdo57b: kqmkz6.ition $x$, 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 oneq z*kx d(mhtu46:z3j w of the following choices correctly describes the relationship between thez4hw6 d*qxt uz(m:3 jk 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 fo clmh 0e5qn*1 :vrfy3yvh*dt 5llowing choices best describes the instants of time, at which the5 df1q0 5t*rehv *:h3lycmnvy car and truck travel with the same speed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.30: Two cars P and Q, each start from rest at the origin and will move along)u2:,08ao.hju- p e o5/bknvqdte h il the x-axis. The acceleration vs. 8i,.pak u2hvl0e-nt h: e q j)ou/d5botime graph for each car is shown. Which one of the following choices correctly identifies the relationship for both the speeds $v$ and the positions $x$ of the cars at time T?


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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.02: The position vs. time graph of an objectn+lf-+xv4o fz, a.me n moving on a horizontal line is shown. At whaezonf -a.+ xflv4+, nmt 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 followingi;gsfn u *gc9/;2dpr y the position vs. time graph provided. During what time interval(s) does the m;d/pucgs9fn; yi2 gr *ass have zero acceleration?


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