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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 speeb1uqdm2q- 8 uid around a circular path of radius $R$, if the particle makes one complete trip around the entire circle, what is the magnitude of the displacement for this trip?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.01: The change of distance per unit timh 7 ku)o-hie:;g 3pooje without reference to a particular directii;o3-gojp)e: k7h uo hon is called

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  12.29: A vehicle completes one lap around:gk3 em; p,fv dvho;e4 a circular track at an average speed of 50 ;k;, mf3vhoe e4:pdvg 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 veloci ac px)29xmlx4h+l t 9byqh(o9*huj. fty. If it continues,b4tm x9c x y92ho+hfl a9j) lx*q.up(h how 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 vo5q1 *)fm1u klavj2y 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 at a rate of 4.00 m/s to the left, relative to the plank. What is the speed ofl) a11qyvuj5ov* kfm2 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 8vq o6lgr05j4t0 km/h and 400 km at 100 km/h. What is the average speed of th6 v0 t45oljqgre 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 o6; stxd9 h:bjqf a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the xxtj;9b d6h: sq 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 2oyrf. hr v of6-0gah8 xp,q/jcar traveling along the x-axis. The graph shown below is a plot of the car’s velocity in the x directi6 ro -yjxvr .,gp802/ahhf ofqon, $v_x$ 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 canceed(lwdn 39o a;;f5 r traveling along the x-axis.na 3l;5(fe o9cd ;endw The graph 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 a duck flying due soutf ks jg,-lsu8w68qx3wdak+wqdq3 1x 5 h for the winter. At what point did the duck stop 53+u,3wdqd-1 s6 8fwq kqwxxa8kg sjlits 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 .(-ch-tf 60,ouczba2jy cfyyy9-jti r u:p+xto the diagram below which shows the position and elapsed time of a car starting from rest and uniformly acceleratingcc-jf . cu yyrz0hoxi(,fb+jau--py6 y :2 tt9 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 diagxwsx* ;f6d;vb vng umg// :+dvram below 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 interval is closest t ;xvdxd;swum*:fv ng//gbv 6 +o


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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 an object with the pjc+:ss: hkhfph. (;o zosition.pzs :ho(+hcs :jhf;k time graph shown in the diagram at right?


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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.28: The following question refer to the fo- 6u6mtqodbb*eo c;,omv;d8 tbju 8w2llowing information. An ideal elastic rubber ball is dropped from a he2j;o6-twu ot*bbd cbmvdu8 moe,;q86 ight 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 refer38z/rlbb1d0t5yy yy8 t l lg3a to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebt3ry y 3ylbl t10d58 /yla8bzgounds 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 with3vjtcok7j de7osn myt fw9 2 (mn4580q 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 following scenario:;0 c-1bh+qr iwu-ddvqt6b;lo 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 tcr/9hs7t hu,x:fr. y2c*mdk z 2lm4vpo 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 fey 4ncll qd0* n(r6r-kollowing 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 thebh; zug6yggcbx 2h0t.53zum9 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 ramp, across a horizontal table top anb8m sp 3af-h3trql(5 nd off the table edge. Which of the following would best represent a graph of the magnitude of the ball's acceleration vs time?f-nq5hlba ( t3p8 smr3


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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 f.o*iokg1j 0ag* f5p peor an object that is moving along a straight line. What is the instantaneous f.*p*gigkep0 jo1 a5 ospeed 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 zt,:1.m0.pfla n znvm an object that is moving along a straight line. Between what times dif0zpm .vn,:za. t1lnmd 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 objectnkee2-1 nszi,uh (9*ozom dc7 is thrown straight downward on Earth with an initial speed of 12.0 m/s from a position *cehu(nok-i2oem zsn17, d9z10.0 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 represents a toy car starting ff8bg 24uiyx4 crom rest and uniformly accelerating across the floor. The time and distance traveled 42 guyfcibx 48from 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 (smni4cebbqf jk1* o 8)v5fj+and uniformly accelermbs e1qkfjc5bj(+8on) v f i*4ating 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 represents a toy car starting from og;lnnbd*w pu14 0u4 6 f/ftbvrest and uniformly accelerati0ngl d 4wbbp;t1*4uu 6f/onfvng 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 uniformly accelerating ball. 232x zqoh4 rfvThe position of the ball each second is indicated. qo3zr4 hfv2x2
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 nxa b-p h9yv/,om5:gb ball. The position of the ball each:hbxgma vp,bony -9 5/ 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 h:rn,du4oxk4.a vp-pxj 2 2 wxcircus clown on a unicycle moving in a straight line is shown in therkxdj-vu apw 2x.4o,n24ph :x 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 s iclyh-bl+e)g q*x*6z traight line is shown in the graph -yzliex *g q)6h*lb +cbelow.
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 surfacj b7:jrh.980/exij fdtev)sy e 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 oo ,,csy (4lbzhf a marble on a table top for 104,b c ,ozysl(h seconds. 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 graph describes th48 c 35s h:daujv qej)r/ev5vue motion of a marble on a table top for 10 seconds. For which time interval(s) did the marble have a positive acceleration? uq vujv/4vd je3)ace5: 5sr8h


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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 ewpj h a,0,z/pthe motion of a marble on a table top for 10 seconds. What is the marbles average accpep,/j,w zha 0eleration 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 uniforaz9,n6 ctwxpsq8y ;- meun2.hmly 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 downward with a speed of u a6ua3jvk)7wmv*5xz $20.0\;m/s$, 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 cg--ubbax 3o:*nxb uq.ould correctly represent the motion of an objectnuq.*xb- 3 -bgu:b oxa moving 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 gr0 w0nnbip 6lxq3 y z7pxm9v-/vaph describes the motion of a toy car across the floor for 1i3xp0/90l yvpx qbz-7 6vn mnw0 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 motioxxe7cyb 9(j4 nn of a toy car across the floor for 10 seconds. What was the total displacement of the toy car for the (b n7ycx94jxe 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 tex9 1s8zewr*xoy car across the floor for 10 seconds. At what tire1*x8 zwe9xs mes 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 km/hr in 4.50 s.rxkj/kk *u 8lvar .:l* Which one of the following choices best represents the acceleration of the r xa/vl.:kj*ku rkl8 *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 velo-l efs) + k80tge( -zksix1l .mbn,fqwcity versus time curve shown. Which of the following statemz1s tl +.b0)qw xk-nle,gse f8f-(i kments regarding 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 moves along the x-axis according to the velocity ver:*i tf+y ibovkt *m/o;sus time curve shown to the right. When does the car have zero acceleration? *: mikyoo+ itvt/fb;*


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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 ts9 ab:eg, n0hyhat the angle between the velocitg0y hba,e9:n sy 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 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 trv/+)4h cphf 3h:v7brs6 comy:gp rvb 6aveling toward each other.vvr/cf6 h:+cpy3op 7g bb4h:smv h)r6
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-eh3apz69 / n1ks)ih hwaxis. When the acceleration is positive and increiph)9kh 3e s16a/znhwasing

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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 vel, n a/pz+ba*vauwav+5 ocity 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 ch0jdt u-p;m)3i1z pb p vy;mh2 tbq3xi0oices identifies33ptt ;zi-10pv;hyqmx dbu i)jpmb02 quantities that 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 moves m 0 h 5f*aysklzw9;+oj$3.0\;m$ 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-time,mldxc9 ,p n1td/p8ez9 $y\;vs\;t$, 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 t 7h79snqw) 7 f 7lipdwq2mtm8wotal time T in two f 2 8nmq7qswhpi9ml wd7w7t)7parts.
• 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 trackylm0pec s34; i is shown in the diagram. The thick line represents the velocity. Assm 04s c3peli;yume that the car starts at origin $x=0$. At which time is the car the greatest distance from the origin?


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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  08.24: The velocity vs. time graph for the motion of a car on a straight tra *41yl aumc g mjb2vef;of)p 3*.ms9npck is shown in the diagram. The thick line repres2pcmujm1fo)n*l. y *9a ;mvse4bf3pg ents 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 f2:qcogm(ij7ci h l8 )object given by the position vs. time graph shown. For what ti cjfh2 coig:)i7m8q(l me(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 r*wozd9,rbx8 m8/kauthe velocity vs. time graph shown. For which tiab / *mwx rr8,ko9zdu8me(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 under the acce7 f,xs ija,oiq ;-c6ubleration vs. time graph for a fixed time interval of aoq i,us6facx;ib, j7 -n 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 v7 p+guui 88rzspeed.
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 pa3kbj b)zk o)vi l0; 00bj.whafrts:
Part 1: it travels a distance of 800 m at a constant speed of 4.0 m/s.
Part 2: it travels a distance of 1200 m at a constant speed of 20.0 m/s.
What is the average speed of the car for the entire two-part trip?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.02:A small object is released from rest and reaches , cg 7s549dg q1ttt)lwckw ,+sb*bnetthe 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 the ground in a time u* 5ys:sb4l -hsmnz,i8tu/ 6n0asj nwxvfw8)of $2.50\;s$. Neglect air resistance. From what height above the ground was the object released?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.17: A position vs. time graph of a particle moving along a c bum*k84mk/xhorizontal axis is shown. What is the total*m8 c4um xkbk/ 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 folb ozq sokzs:5( :jr 5s2*qzq5olowing choices correctly identifies all of the listed situations for*o kqsz(osq q oz5s2:j:zrb55 which there is a non-zero acceleration?
Situation I : A point object moves in a straight line with increasing speed.
Situation II : A point object moves in a circular path with constant speed.
Situation III: A point objects moves in a circular path with decreasing speed.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.32: An acceleration vs. time graph for an object moving 04fwqyue. *v:i sm:y ralong a line is shown. The object starts from rest at time t=0 s. At what time(s) does the object attain a maximum displyy m ri0qefvu.:4*:ws acement 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.iry j,;fm7y d+)xiu4undye n 2l -st; the origin and its velocity 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 moving away from the orj .; y7-eitnl4u mf,yrdxid; ny+)u2sigin?


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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 horizon:ev+j 6 vuf-8- m0cce0pwi wbntal track, each with constant acceleration. At an instant of time, the informatio6 v upb8evm+w-f-w cc: 0iej0nn 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 positiopkh.b70be zz7f ujr6 3ljyu,.gd 3 es6n $x$, 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, whi1imtup iy +8aki.80dqch one of the following choices correctly describes the relationship between the average speed of the i ayi8qpi mk1u08+d.ttruck 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 jp**8 g xqihqi22.r w5vb-vlkthe instants of time, at which the car ag-5*pvq.r2kjw 8 *2 qhlxvbiind 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 h;f3e a8+rt3hjsnr /crest at the origin and will move along the x-axis. The acceleration f33rhs ra+jhn8e/ ct; vs. time 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 object moving on a horizo5osqcz a4ks2blr00 : intal line is shown. At what time(s) is the object moving az2o:k4ri 5q 0lbc0s swith 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 gl yi 2,.fhjm4l48kdp vs. time graph provided. During what time inte g 2yl.,8fj4dih4lkpmrval(s) does the mass have zero acceleration?


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