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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 radfa9fw5hz2 u1lius $R$, 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 refk:prz.clwbibv. 6g8(erence to a particular direction is cark.(bgb. pwcv6: i8zllled

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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 chc *4/ +b ey*djwvge/qircular track at an average speed of 50 m/s and then completes a second lap h+g/j*w4e c /eqbv*dyat 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 co d7:cvlg*-ngwae*u/ k nstant velocity. If it continues, how far will ie7kd/*gc g*a :u -vnlwt 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 planks x, ev76 .mek7u w+*azjey:ix 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 :7xxvs i ,w.amje+ek*z6e7 uym/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 ae-fqb)bqvr(g1sybop*(,pj k p*d :/w t 80 km/h and 400 km at 100 km/h. What is the averaqb*)ogrywpsdq b,-bj/ :e (fp(vp1 *kge speed of the motorist on this trip?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.20: This question refers to the motion of a toy car traveling along th7 bxz)x9/aoa se x-axis. The graph shown below is a plot of the car’s velocity in the x direcxaxo/ 9) bsaz7tion, $v_x$ 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 thdzveo . 3+eoo-5b-qrze motion of a toy car traveling along the x-axis. The graph shown below is a pl 3 5erod-ob-ovz+qez.ot 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 c)p 0*0 qwo6n:hxpqcxcar traveling along the x-axis. The graph shxw:hq co)*cp0 p6qxn0own 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 flyiyxj 8e 0es3a9n ;szim;ng due south for the i98s0ya3s eemj;nzx;winter. At what point did 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 belo;f31ha2a.9ulcu /(kjt ltawiw which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the average velocity of the car duringti.ja9l u(t13kha c awlu2 f;/ 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 be ; l-i tk55.eez5hiepklow 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 entirei .5h tkiee5kz5;-lp e 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 oj66t45ktryiw2rk je,o67gp l bject with the position time graph shown in the diagr rjjk,6w6ttok42 iglrp 5y67eam 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 follo*zn 1 l6t5ksfyi 7;xdpwing information. An ideal elastic rutd6lz nsy5k ;7xpif 1*bber ball is dropped 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 redfys iz,b *ly( qh1:u6fer to the following information. An ideal elastic rubber izy:l6q 1(h*sufy,db ball is dropped from a height of about 2 meters, hits the floor and rebounds to its original height.
Which of the following would best represent acceleration versus time for the bouncing ball?


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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.39: If a boat can travel with a speesm8qm* :pq 8pdd 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: At /y+ l,v9kiryo 3yi;zl y0,c yh$t_0$, 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 tb ;on-2w 0arc(jt .3bwkdukr0 o 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 sca75f(ux*q fv m fgb91nenario: 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 follow7 c3+qclv .kw b/kx+7h z al,unb5)vybing 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,z opn,zgbn1ao/ s58oeyc-jk .x* .(n z across a horizontal table top and off the table edge. Which z-o *e,y(okc/so g nx.j p nazbz1.n85of 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 time for an ob;ydqh4qc8k) 0;esror ject that is moving along a straight line. What is the instantaneous speed of the object at t = 5.0 se d8 )kos04qyher;c;rqconds?


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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 relatiti hy n:d4m6yruo825fsb6ah+ onship between distance and time for an object th:54+ 6 h8stf6rud yoam bhiyn2at is moving along a straight 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 throz*sep8/k kkz ve sy2s9vbt.8w u2x;j: wn straight downward on Earth with an initial speed of 12.0 m/s xwu28s st s 82e:v pjz/z*y;kkekb.9v from 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 reprez08+1 tqdyv)ky fv)tdla 3)xgsents a toy car starting from rest and uniformly a)tkgvat y)d80yzv1)+3fdql xccelerating across the floor. The time and distance traveled from the start are shown in the diagram.
What was the average speed of the cart between 0.1 seconds and 0.3 seconds?


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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.12: The diagram below represents a toy car starting from rest s 9 lmcu7g20kii x,w0fand uniformly accelerating across the floor. The time and distanceic92w7ifsu 0 0, lgmxk 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 ani v60 xfm mxo10n3gsx8d uniformly accelerating across the floor. The time and distance g6 ns130xmvm 8fi xxo0traveled 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 uniformlip6,b p8;wn f r:z*dkby accelerating ball. The position of the ball each secondpkbri; pwf8:dnz* b,6 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 ac)s-fub4*2 + 7 ojwjgsf9a/ow)rxllntcelerating ball. The position of the ball each second is infblr4l* js))j2 +9twwu fox -g7 an/sodicated.
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 88;foaesvi7 aclown on a unicycle moving in a straight line is shown in the graph beloa f;7si8v8ae ow.
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 g;b 3mb qu 9 t2ieab1z2*/tacdin a straight line is shown in tq2aad2b1b3bg i /zm9*t;ecuthe 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 surface of the byzg *3/b jop6.rjd5gearth

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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 ir8jczd; ol*6top for 10 seconds. For which time interval(s) did thei 6l*cd8;zr jo 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 the moti) hbcr.6-d m5kywcsz)on of a marble on a table top for 10 seconds. For which time interval(s) did the macb.ck)r d wmys )5z6-hrble 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 describdoztd pj*e5*)ig5 yrudou/4*es the motion of a marble on a table top for 10 seconds. What is the marbles average 5/*ir*djd)5p dzyuoeguo*4 tacceleration 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 unifor hxzf -(s*);4f mv.upkb ggsb9mly 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 stra a9x-ms e1f3fright downward 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 coul)bc s /k;9umd cnzz2+x1*anh ld correctly represent the motion of an object movi/s2; xbc)amc1u +dn9 khn z*zlng 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 graph describes the motion of * vw,:nc5nvi12q t1jc km9yoqa toy car across the floor for 10 seconds. What is the acceleration ovq9n q5wyimncc1j*1:v 2,t k 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 toy car acrossq o/g*rn5j7)l)-v gb5uot s f74h rmte the floor for 10 seconds. What was the total displacement of the toy car for t45los/7f5u7ot)rt vnrg) hqgjm-e* bhe 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 descr/c6 uqn7r n4ilqia(u alcv+nql5.9a7ibes the motion of a toy car across the floor for 10 seconds. At what times or acva9uinqqn7l5 4+l(u.7r /qil6nca 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 lmn /ryy-f p2b.,d pcda;vb7:in 4.50 s. Which one of the following chon2pb b7pmya/d;r :f-.lv y,d cices 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 following sdyu+y p4e uf m/a-z-;btebydmyuu / a -p4+-f;zatements 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 versus timqkze-x/q kq4xo *p61l e curve shown to the right. When does the car hav /keqxzpqkxl *q64 -1oe zero 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 interval of time, a tennis ball is moved so that thj; i; eyhh( wwif2. l5rwfjq66e angle between t6y;6.jqf(hwl52 wii;fr whj ehe velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is true about the tennis ball during this interval of 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 ki9e2b pxs3t f og3h28jalometers apart and traveling toward each other.ts8g ab fe2923hp oxj3
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 positive anq s5vro+j/5xm8wcv6 r d increasrr+s 5vcm8/j xv 56qowing

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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 sej2,l1x4e - sp9nqhcf 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 th uv drro(mc5)-zk; zy2e following choices identifies quantities that must have the same direr vo25yzc- mr)u zk(d;ction?

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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 moves6*9 a6.cn(sg*i motaz bz8pjh $3.0\;m$ 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-timcwb*z0r:vmwdg:b+ o5n- -j .1duj a jle, $y\;vs\;t$, 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 lg4 m7ovyyijiwu xv (e yme:90d. 2/t-track for total time T in two parts. v:.j4m0 y mydov yg i/lewu2e79it-x(
• 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 c(fd7q 7oyn9tqkga 9.ear on a straight track is s9 t(qo9. dfgq7yaek7n hown in the diagram. 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 vnak +0 5df.ru hw-cp;zaosr22 s. time graph for the motion of a car on a straight track is s.2;u ak a5c ohzrn-d 0p+fr2wshown 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 k8kgdp9 j c3l;object given by the position vs. time graph shown. For what time(s) is the speed of the objec9dg3jpc8 kl;k t 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 motion6bjco :h)64o* o5 3zkjpasbh3o c0ja e of an object given by the velocity vs. time graph shown. For which time(s) is the acceleration of the ooo 403s a6o pbj6j):kcjzhbo5*c h3 eabject 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 dss;1ekpgbg(u m:foq (*i 4y6 the acceleration vs. time graph for a fixed time interval of i:em14du( gk fs6*qyobs ;(gp an 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 mov *sp nc-it hp*m2fmkh4+(s e8aes along a horizontal line with 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 hqit2l) kvsy9hf 3q/+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 releaser/wepew/4.(8r zv mfu d 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 i z/bvfqk.4p/w: p.u rvs 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 gi2k:kus2 i4mv4,r wx along a horizontal axis is shown. What is the t siu4k :xkr v2wi,g24motal 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 following choices correctly identifies all of the liste(*czq48 ;4wx l;pdnvy pls3nx d situations for wh ln;*3 xc; 44npp8qxvzds ly(wich 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 along a line g :7q1ff*+dzck cuw4gu 9hby0n/ ,kjcis shown. The object starts from rest at time t=0 s. At what time(s) 9cu4kdqjg0+f kn:*,cbufw/y g zc71 h 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 lig33ag k3 xkgd*ne 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 3ak3* 3dgkg xgthe 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 ,/ :gz0sgu kshn-hq bigy/5oep+ql ((civa3*to the right on a horizontal track, each with constant acce:(ig3sgug ney (+a/ -hop hb/q ,lvci5ks*q 0zleration. At an instant 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 posihm-m82qg52 4iwpab2gqexza: n2vpq . tion $x$, 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 one of the followingm vj+5qfmz68bcgq/4 y choices correctly describes the relationship between the average speed of the truck to that o f8mc46bq zj/5vqy gm+f 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 followvi pf:)q, ytr+,ae,v8qyid; k ing choices best describes the instants of time, at which the car and trv,qtq)8e ,;pi, aiyky +d: rfvuck 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 r3ij kwn ;y0w:6cwppt -qzpy.3 est at the origin and will move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the followw;n0tw-jw qzypp33 :c6k p yi.ing 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 gra nutz4w1l75:n6vg8 kit d v-qcph of an object moving on a horizontal line is shown. At wh6t8n q4w:dgu7vvi15zlc - t nkat 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 alon9f4 qw o l,6twyqcox4*g the x-axis following the position vs. time graph provided. During what time interval(s) does the mass have zero acceleratioxyft4o, q9wwcl* qo4 6n?


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