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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+r g hm/fx9nz*)m u6gq 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 distan+js/x 8l.w6 ;m aic9y. afi:b 7hrjcudce per unit time without reference to a particular dir x :.wbajm.sdi+jc; c hr86 luia/7y9fection 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 on8lx76o.8qs+hmxtl l x e lap around a circular track at an average speed of6l.qshx+m88 x7x oltl 50 m/s and then completes 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 the constant velocity. If it continue1mnq+q xb b9m-evg i(-s, how far will it trg(-m b9 mqv1iqx+ -nbeavel 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 mt yr8pvbz:xz/cn 8 9b:rih 4e4/s to the right across a frictionless pond. The boy then turns and starts walking on the plank at a rate of 4.00 m/s to the left, relative to the plank. What is the speed o/rbpxz9:n:4v 8bez yr4i 8cht f 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 400h7.zsi- w. ulz gpa56 zfy:-hj,7xeej km at 80 km/h and 400 km at 100 km/h. What is the average sp.5-spz lgezeuhaz.ix -7:jyfj6, hw7 eed 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 the motion of a toy car traveling along thet coxdx2.s)y- x-axis. The graph shown below is a pl.tcsx 2xd)o -yot 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 refenp5pznyz*x2v-h 3lw;-nup n)df zir - x*o: -ers to the motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in t2:f3--vn p-u5p;hie xzl* z-x)p*rywnodn nzhe 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 theeq9oa6 l v:9ms motion of a toy car traveling along the x-axis. The s 6m9qe:l 9vaograph shown below 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 nu 4o)dat7q*t)uc6 uba duck flying due south for the winter. At what point did4)btq tuo)ac6du7 nu* 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 ela7*dim6. fwu 8nf/ .ypww*hftxpsed time of a car starting from rest and uniformly accelerating in a straighu* dwwmf.t7h/ f8ywfx *n. ip6t 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 tm:u oaml;ak.p, +l at1o the diagram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The a:.m t+;aoa1pak ,ul mlverage 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 g0m zxslpb6v6i 00ba/velocity time graph for an object with the position time i 6 z0m la6vg0b/x0bpsgraph shown in the diagram at right?


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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.28: The following question refer to the following information. An ideal elagvas2n)w6 f1t;(tmyf5 9 phqustic rubber ball is dropped from a height of about 2 meters, 5v2 f(6tmwt g aqp9;)hy1unfshits 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 ques k hn(c-73gzxetion refer to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits t3(gc hnz x7e-khe 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 trav.af/ykehb2na tl x;em : fj)j-/rn7w3el 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 refers to the fa,dxfhhr9 h2a;,eq4 sollowing 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 scenario: Attn6w 8-j,ian h $t_0$, 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 followrk(vduh j,wc6 6wj e 4d(*nd(ying 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 m 4u 8kbv7 bqwba2w.jq7s8oo,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.
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 abuqus 6+g ktp 7gp qkgfv24i9w1ct5;/ ramp, 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 acceleration vs time?wfu ;sggg1i47qt kub pq2pk+ 6vc95 /t


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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 relationshif2qzu4 szfbfs;njct4 *.4r8 jp between distance and time for an object that is moving alonz;r.4szfu c fb4*q42jfjst8ng 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 8s+dq(nvz f :ndistance and time for an object that is moving along a straighs:8+ zq nndf(vt 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 on Earth **dej pap* 3sawith 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 a3*a e**sdp pjit 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 stare+lxr am l:c056cihl7 ting from rest and uniformly accelerating acros7r : l lxmlhc0e56ca+is the floor. The time and distance traveled from the start are shown in the diagram.
What was the average speed of the cart between 0.1 seconds and 0.3 seconds?


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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.12: The diagram below represqp(qv4r6j7;7jzoho1vkc8ro ents a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the vp6roj ho7qq8o v 17cj;krz( 4start are shown in the diagram.
What was the acceleration of the cart during the first 0.4 seconds?


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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.13: The diagram below represents a toy car starting from rest and uni:jh y;6ddt:zcformly accelerating across the floor. The time and distance traveled from t6t;c: jhydzd:he 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 accelerating ball. T-ybijd/cb+ kdnoe0x x/ 46l0vhe position of the ball each second is inoybexvck6 j4+/0bdil d-x / n0dicated.
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 of)*+b2;w dnz qgbvs/re the ball each second)b +r* /qenb;zdgs wv2 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 a straight line is say0l/t0mus+d- x5x i shown in m s0-dx5x/l suy+0iat the graph 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 a unicycle moving in a straight lin(;bch 7vbjcr+2f u mx:e is shown in the graph below. b:b +chr2jfx;c7mu( v
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 fyr.32skl*fo l9m u *qlalls freely in a vacuum near the surface of the earth

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.11: The accompanying graph describes the motion of a marble on mh onv,1wx058rh.p chv jay0/a table top for 10 seconds. For which time interval(s) did the marble have a negative v.1 cj5r v/8 ,ho0pyhavw0hxn melocity?


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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 tamd vzi1i-tjw7xvg54xq 3 rm+ 0ble top for 10 seconds.1d3z -jimx5+ r74q0x v wigvtm For which time interval(s) did the marble have a positive acceleration?


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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.13: The accompanying graph describes the motion;mr f;w0 tcvj+ of a marble on a table top for 10 seconds. What is the marbles average acceleration between t = 3.3 s and t = 3.8 tm+v;c;w j rf0s


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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 timeqsaivo)ev6 k;s)5to3 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 downward with a speed of h:cbclq* +k/z $20.0\;m/s$, 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 z2bfy6ht v h80of an object moving with a constant spee8hyz6vh tb20fd 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 accompanyin . gy+vc,wxi )88kpu mvvcas*+g graph describes the motion of a toy car across the floor forvxm8,py8 va)gs cc iv*w+u k.+ 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 ges-5x pnvemk(r )n2 qx5(p *pmotion of a toy car across the floor for 10 seconds. What was the total displacement of th(ps5 5em qkpe(*pvnx-rx ng2)e 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 motxpim lae ,7 hrz6-u-s)b+j z n:(y4 qo2izewl:ion of a toy car across the floor for 10 seconds. At what tie 46-euz z-il:slrm i,x+j)haynb :wq(p 72ozmes 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 uexn*. +sr(zk5z 6r k g*h9loe60 km/hr in 4.50 s. Which one of the following 6*lrsh(ex knge ok5u9.z* + rzchoices best represents 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 velocity versus time curve shown. Which of the followie8f8*ijnn5 g 37pakj0 z zjke 4ts5gi4ng statements regarding its motion is NOjnkej0j3 8 z5g k7g4ensa5ip8*tzf i4T 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 velocit;u2;f6ddbn7. +rf xin engqh0y versus time curve shown to the right. When does the car have zero an;bfxq2 gin 6 ue.+d0fdr 7;nhcceleration?


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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 baob 9tio6td*(m ll is moved so that the angle between the velocity and the accelerationtd9o6*mo bti ( 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 automobilex5vn;ruzhc a5 ( na 1tg,jk*15evqe r/s are 150 kilometers apart and traveling toward each other.vrqz(v 51e5a5cejar xn hu/ ;,*ktg n1
is moving at 60 km/h and the other is moving at 40 km/h. In how many hours will they meet?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.04: A particle moves on the x-axis. When the acceleration is px2dyou j 7j,7positive and increj2ydp u,7x7oj asing

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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 vex7 )7cg ocg8xtlocity is

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.18: For any motion in two dimensions, which one of the following choices idi*bz j,u+5icsentifies quantities that mustu*ji ,5bzi+sc 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 moves ef13kb;d n e5pj b4;j zovdx28$3.0\;m$ 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-tikv rlpi8wn 6 ux52i9g o3ob:4eme, $y\;vs\;t$, 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 for total timel+kvuk1 vt,5r:r2kti yvc83y T iu8c5tt3+lk,ry y 1kvi:v2kr vn 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 strslibu5l*+7ub- xnt . cl df,s5aight track is shown in the diagram. The t.-5 5ib snl u*lult7sb+xf, cdhick 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 ca;: -.unkgad 7pd x)loar on a straight track is show -a):ludd.ax7gnkp o; n 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 givenbt7 +/wt dsaa77 4pfhh by the position vs. time graph shown. For what time(s) is the speed of the object greates7a+df7sw tba7h ht4/pt?


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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 velol kv53ps ((ciwcity vs. time graph shown. For which time(s) is th lpk5((cisw 3ve 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 under the acceleration vs. time grap8abg(;.;hgdadg1:dq-vk0 ecmyjp7l h for a fixed time interval of an object’s motion, what quantity h1khd70y8b l de.;(:; jvgg-mpqacag das 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 increasi 68f-c/ p6dpvzah4l)d bp v5gmng 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 parts:5l gn,gnu tml8)nc)(o /p;i 2x,tcong
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 rele8s s7+n+kjqq(x 4pywfased from rest 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 fro ew5 cgsxow.h3 5wzj:26fn n.a 0m,qjnm rest 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 alonr:7lhgn e c u5x;:bdxkp(25yj g a horizontal axis is shown. What is the total distance traveled 5u57p ;: n :xjhxdlrke yb(gc2by 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 correctly identifies all of *pdh-c1i1q/c*r phv v the listed situations for which there is a non-zero acceleration?vcrc v * dp*p/1h-iq1h
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 m -3wvatrwxnaz mn0rvc. ,k:,0ib 88oq oving along a line is shown. The objec art3 0az m-8ik ,wv 0o.x,c:nwqnr8bvt starts from rest at time t=0 s. At what time(s) does the object attain a maximum displacement from its starting position?


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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.17: An object starts at the origin and its velocity along a line u6moq)qiop3;ttlc vx v tso5 v ()5v/2vs. time is graphed. Which one of the following choices best gives the proper interval(s) of time for which the object is moving away from the orivmxti;/v3oq vs)(556lp)q u vtto2 cogin?


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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 tracn.bi-ne2z i((usa l9 zk, each with constant acceleration. At an in(l9s -az ibnu( 2.nezistant 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 positin1ay;p96 krta on $x$, 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 grap/m*;tv cka3sly9c*wx 8hn 4wbh, which one of the following choices correctly describes 4av9*n 3w/tmck* 8yxb; clwhsthe 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 followi* o0mjpo ss)hy- km4ixr .bo*(ng choices best describes the instants of time, at which the0ms.*b)m roo-ho *kjp(xi 4 ys 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 fu..dc(lqb*w*hvy hq3 90locs rom rest at the origin and will move along the x-axis. The acceleration vs. time graph for each car is shown.9hq.*hovd.ucyb l qwc 3l(*0s 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 o* .zmei(f0 xcif an object moving on a horizontal line is shown. At what time(s) is the object moving with its grea* iz.cf (emix0test 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. t77zycsy9zwp(* g (fpf ime graph provided. During what tim7w gcpsy9pz (zfy*f(7 e interval(s) does the mass have zero acceleration?


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