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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 radijnoz 9;ck+-qyat9 )zp us $R$, 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 ddtiljssvg ))v 5s73l.(vcc( p ,b7/ 2ppih cudirection i pglj,dsc) v2 /ii.7s cds p3 u7hvbt(()pv5lcs 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 a cia vnggw2ja 70lzf082crcular track at an average speed of 50 m/s and then completes a second lagj ng8cawz0a7 l vf202p 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 i 6ltg ,hnqhhrcuoh j,k8 1hwo c;, /;y2m*ie6xn 1.0 s at the constant velocity. If it continues, how far o2 w ;tku nl,hxch6c,r/i, 8;jme6g*hq1o hhywill 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 yo:x 6t*g(i jo30-kg plank that is sliding at 5.00 m/s to tyog 6:* x(ojtihe 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 to the pond now?

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.18: A motorist travels 400 km at 80 km/h and 400 km at 100 km/h. What is 7 0cjphko +0dythe average speed of thpodhj 0+ 0ky7ce 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 trav-5crygbm;ui7m2*gl h*ru . yk eling along the x-axis. The graph shown below is a plot of the car’s velocity in the x directi umbl - 2rm.*y;gi7y*g5h ucrkon, $v_x$ 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 8 ms/i(de6u8z5 vkfj urefers to the motion of a toy car traveling along the x-axis. The graph s si (m/kv6d8u zeuf85jhown below is a plot 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 travelka ohuxks865- 1k5z ajing along the x-axis. The graph shown below is a plot of the car’s velocisz 5-xk5k oa6 j1aukh8ty 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 south for tywngg/1kk8 *whe winter. At what point did w wk/g18k n*gythe 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 t4yxx:j 3 wa6(pe. xehlhe position and elapsed time of a car starting from rest and unifo.xlh :jx64p ayex we3(rmly 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 below which shows th2v 9ng vv*o-mme position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleration during the entir2vgmno 9-v*v me 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 velocity time graph for an object wi d96hx2p7-z csnbm7dmth the position time gcnspx-bd 9zdm2 6hm77raph 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 tgahkdhvgr,(b / ha82-o the following information. An ideal elastic rubber ball is droppe(8 g2v ,rdbahk/ag-h hd from a height of about 2 meters, hits the floor and rebounds to its original height.
Which of the following graphs would best represent the distance above the floor versus time for the above bouncing ball?


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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.29: The following question refer t6q/v s2 (umvo5+zys mho the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and reo( y6muv/2mqs zh 5sv+bounds 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 d hn2r-m:)md+ j1wtau 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 following g:yqkx:6 sc81 n jqnhf6f z6i3scenario: 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 scenagfs1xr- ye4 f okv1.v1rio: 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 followi19q2hbfl(2; rz o+ce4aqo:mdd ,htpj ng 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 the following scenarioc 6olr +qga*6c: 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 ,hbpqm *i9l+0:asq mw.gcz e ;down a ramp, across a horizontal table top and off the table edge. Which of theh a mb *;mipqzc0 .qle9w+:s,g 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 t /mxyk,ao3ic),c vpn0 ime for an object that is moving along a straight line. What is the ,xvk,yn picc a)om03/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 tdz0) ; xkpvu;vhe relationship between distance and time for an object that is moving along a straight line. Between what times did the object have a nozu)0; ;vdp vxkn-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 initialw ,9g/gdhasar4 7tom8 speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring r9am/gg s4hwda,to78 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 represente+cvemd g 6jss 5*yne*1u *nbz1sdy/0s a toy car starting from rest and uniformly accelerating across the fnss0 eeyju+*d*g d zbm51n6 vce1y/*s loor. 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 represents a toy car starting from rest and uniformly a;8h(6k o:lqmczz4n b1 9lyexwccelerating across the floor. The time and distanc zwmz9b: l1lh 6 e8k(n;ocq4yxe 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 rest anr gdyi5/pb e;-d uniformly accelerating across the floor. The time and distance traveled from the star/ 5rg; iyedbp-t 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. The position +w4f8eweun q 5w+d3cbof the ball each second is indicated. n5w be+q4e+w8dfuc3w
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 acceleratingw :qpqy 0cr+b-e8lg99r,paaj ball. The position of the ball eacjp+09 r, pa8-g9l wqqayb:rech second is indicated.
Which of the following is closest to the acceleration of the ball?


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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.17: The motion of a circus clown on a unicyvkr2wk aa d/( g;h5ni9cle moving in a straight line is shown inki9;/ndga ak 5(w2rv h 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 straig:bau5vo ,du y45t mdrepl 8(6kzz/9aa ht line is shown in the graph 8(l6 zaarp 54vddzyu/btko9:a um ,e5below.
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 suk8 fv 0kvagbt;kew1+ * *plz7brface 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 motile-n ,brqx+t7-ox emtk7 xp j-;q f7d7on of a marble on a table top for 10 sfl rt dx7et-nkqx,7b7+e7qp - oxm ;-jeconds. 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 thetl+5:8zls;tjk q7 c kl motion of a marble on a table top for 10 seconds. For which time interval(s) did the marbl+k5 l lzs :87clktj;qte 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 descr9hgip w 2)eq g2nn:dk+ibes the motion of a marble on a table top fo9+pd : wgn qn2h)e2gkir 10 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 accelerates uniformly from rest nv-ge7/ dd ud h)71cmrfor 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 dl +lj)qd34r*y : qctak95xzk fyh2eh t3m5(wcownward 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 a ;snwf:49elaw0 z6grrn object moving with a constant f9r esaw0l6zg4 :n;wr speed in a straight line?


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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.24:The accompanying graph describes the motion of a tost:kydo/g 5w90vywz8*b7n;noa pf*m y car across the floor for 10 seconds. What is the acceleration of the toy car at t wt9w*p f7:m;ovng5yzod */b0sa ynk8= 4 s?


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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.25:The accompanying graph describes the motion of a toy c m4gja k ev4ycn+37hp-d(clg1ar across the floor for 10 seconds. What was the total displacement of the toy car for the entirahg7l m gn4+e14jc-k pyv cd(3e 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 grapcuqz e,d cg*owz 08.nig41iom ,n8)xch describes the motion of a toy car across the floor for 10 seconds. At what times or time interv4o8q x ,,gn1*cc 8woge)i0 zmnic.u zdals 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 +t 4z. rgwfrd:scqm)0 60 km/hr in 4.50 s. Which one of the following choices best repre+wr)q r st.g4czmfd:0sents 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 tx)rt,o9 x7q( lexx +gm :jnc*fqjz,1kime curve shown. Which of the following statements regarding its motion is NOT ,q)kxmtr9 cxzjgn:jlx +x ,e7*f1o q(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-9,*re s phhq.csft-p:axis according to the velocity versus time curve shown to the right. When does the car have zero ap rf pe9:,hhts-sq *.ccceleration?


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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 balnq,,ez32y,pac f;fd ml is moved so that the angle between the velocity and the acceleratiozmc n3df 2yp,a ,f,eq;n 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 traveling towar(5ell nm15t,p i m i28i0kcsitd each other.p2m c 5(s,ki805mitiitl 1nle
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-aych xt1bj*u0:xis. When the acceleration is positive and increasi h*yj :txu0cb1ng

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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 o/dm/94/iz pzags3nva xm5l+ ef average 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, which one of the following ch zhk;t+c6hxhch;v+-t x; ir:x oices identifies quantit h 6cv-; zcitxx: k++;r;xhhthies 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 move/dpeou (t0/knrr b (1gs $3.0\;m$ 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-timraqfd,1/ywz x/4. hzze, $y\;vs\;t$, 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 alonh,rkqbp ao9(i8nxmq9 4tt -4c g a one-dimensional track for total time T in two(nb ap94 i,t8xr-9hk tqqmo4c 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 tdhje :v u dq8/oqr6j*hq6n7. qhe motion of a car on a straight track is shown in the diagram. The thick line represents6 h*/e8h6vdn qod7qq:jjq u.r 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 motioefk3b izuk*8+ xx-6orn of a car on a straight track is shown in the diagram. The thick line represents th z8br3 - fk6xoxu*+ekie 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 sn+(*ivs6*d utf bhqox*u4hn:/3 bevlhown. For what time(s) is the speed of the object greatest? /t eb *n 4hv*vnx*ubf:s6( u+qhiol d3


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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. t gjfxj05i0u,vime graph sho x0ufgv,j50ijwn. For which time(s) is the acceleration of the object equal to 0?


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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.24: By computing the area underoqd xq+sm bll*:++to 6o*kc9h the acceleration vs. time graph for a fixed time interval of an object’s m qchxl9 oob+q**ol6 mdk:+ s+totion, what quantity has been determined for that object?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.08: An object moves along a horizontal line with increasing speed nwc7y-j:k/ko(tf c.v,*i2mp56je rp i-v hdw.
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 ytam*v n .0ej)trip 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 rest and reachesn). a)g7;qrtnciu h:w 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 objectk p*so n.29rt 1-omymy is released from 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 along a horizontal axim21 p3g mm2dgis is shown. What is the total distance traveled by the particle from t=0 tmgd21 i m32gmpo 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 chfhj8)7uluwve 0, 8t q8eu;enroices correctly identifies all of the listed situations for0q8)ujeuv8u h e7l ; ntef8w,r 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 acceleratiodajokq4o89/ckm l z,9n vs. time graph for an object moving along a line is shown. The object starts from rest at time 9, kajd4mq8o/olk9 z ct=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 veloc0fv15nz*op n vity along a line vs. time is graphed. Which one of the followingv51n on*vfzp 0 choices best gives 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 a7zhu mrn nv0x,;i1jom rv0 .+w horizontal track, each with constant acceleration. At an n1ozh vx 7, nrm0jwm v;i.0r+uinstant 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 zojd2( ou*e2ss: s(gca 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 theg 7e qdt2,v(:dpl py8z graph, which one of the following choicevqp2yl7gzt,8p:d (d es correctly 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 ck4pc8jygm u ( 98ia0ndescribes the instants of time, at which the car and0m 8ck gncupi(8ay9j 4 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 a(6u6jn u-d rw qcm -o0l;sa o )lhcz).1jc;xrdt the origin and will move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the following choices correctly identifies th)c )xrj;( .ml1o-cad0u-lqdsroz j6cwn ; hu6e 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 .8w4ud:cartmv 1ie2non a horizontal line is shown. Atvn.w8tu2i d4 :m rac1e what 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. time graph b8dsyw,cok* 7vi -tz/.5b ,ujyz0od jprovided. During what time interval(s) does the mass have zero acceleration? 8zws5 bu-k,0 vyjci jdo ./7y*otb ,zd


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