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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 f8j p.1c.b9 yfnkfq* bradius $R$, 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 with)+d nd62 irvhmout reference to a particular di r62 +dnh)dmivrection 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 a circularrsi6l*zq 8, l ceze8e8 track at an average speed of 50 m/s and then completes a second lap at an average speed cl i6* 88l8eer sqz,ezof $V$. 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 y b. 0vum*irc*velocity. If it continues, how far willbu0im* v*.ryc 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 xxm2 bb9z)6 .u-n5xi7md dodhstationary 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 .x o- m xz9bdm7 u2dbhd)x5in6walking 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 ed vb7)9x +mo):dyevmkm at 80 km/h and 400 km at 100 km/h. What is the average smddv ev97)b oxym)e :+peed 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 t59x een9boa45a y 1mjbraveling along the x-axis. The5jba5beeo4xa 9n y91m graph shown below is a plot of the car’s velocity in the x direction, $v_x$ versus time $t$.
During what time interval was the car moving towards its initial position at constant velocity?


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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.21: This question r/v5z a-wxgkffh t-8l d q2:u)soe u3g8efers 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 the x di2gu: q8flwk-xg-f5z/d38av uh e ots )rection, $v_x$ 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 cao*eu*ed.ht.yrw tm a89bbn4./xn+d b r traveling along the x-axis. The graph shown below is a plot of the car’s velocitrn9.+ n/dmdt et bo.4ehx.**a8 bywub y 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 fly qz:n1r hkf.x*ing due south for the winter..*rfxhz 1nq :k 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 questionbi-o4b1*nx xk f:k)thfj) 5hj refer to the diagram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in akb:)1jk4- jf5)*io hbxhtf n x 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 t5r xekrv2 vx 86;h;kjthe diagram below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average accelexx r2jk e6vvt5; r;kh8ration 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 ); ppk tr1(,0ock;jbdg+ji : c+gum ,rp2czmq velocity time graph for an object with the position t)goz;pt, icpm:2qjk1j 0pru(m ,gr+kc+; dcbime 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 following infmgtsw 2h 4guso.q9 b/t4;f+g pormation. An ideal elastic rubber ball is dropped from a height of about 2 m wssg4h.t+ bg4tupqfom2 9g /;eters, 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 to the following information. An 8-u0dv/ k*:vhmp s spvjf w79wideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its originahssvvp 87df:/wm j 9 k0up-v*wl 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 canyns)2dr f;x o0+8xpq g travel 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 sc gqv(fc :qhe) c ()i0rt(9e( rgvow2ayenario: 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 follo)bse6 ka /j:oi o;+wvpwing 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(naz9 +c,x 9lgb1 1sx8djax-xf5 widg 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.
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 t;oqg.n2am9 e/ agzie+,tm u3ho 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 a ramp, across a horizont6qr*(y hiujq(o 1pq4cncpg; v4f2)sxal table top and off the table edge. Which of the following would best represent a graph of the magnitud;4q g4hxnvjfcuqopcsy1( p(i2 q)*6re 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 represexi)) b:ll7jq vnts the relationship between distance and time for an object that is moving along a straight line. What is the instantan))7jqb:l xliv eous 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 0yitg8 3yy+ :)lqxvscdistance and time for an object that is moving along a straight line. Between what timgy8cx3:t s i0q)yv ly+es did the object have a non-zero acceleration?


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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.07: A small object is thrown straight downward on Earth with an initia)c0wwf-6qv ez l speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resistance, the speed of the objecfzq-)ce vw0w 6t 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 from rest and uniformlyalt8 0an:okq ( 3y8oyo accelerating across the floor. The time and distance traveled from the start are shown in the diagram. 3 lo8oo08anq k:ty ya(
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 ut dwg39jabt5q 6d4u -tzdh1(qyl2a+ eniformly accelerating across the floor. The time and distance twtdt lqq5aeu26 hj14d (y tz3dga9-b+raveled 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 rkh/t1* e4)1siv xua3l7mrpxand uniformly accelerating across the floor. The time and distance traveled from the start are shown srt pv*4rl1ha 1 /)xmxe3iku7 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 ki. i :s ,oiw-a*5-apjytlf k5uniformly accelerating ball. The position of the ball each second is indifa- ow5ia .-i y*ti,p5 :lskkjcated.
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 ai4x0a axk75dh h9tax7ccelerating ball. The position of the ball 075a d9xt7ikx x hha4aeach 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 unicycle moving in a straight line i *0hbp,fta*e6 n1.:b ph wkzlis shown n*bfpkhp.b* :h 1 ,i0ltae6w zin 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 onwe,l, 8wxi op8 a unicycle moving in a straight line is shown in thewx, 8oep,l wi8 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 eartg xjp*bp0 tyaw(x0.(7r h( jbw /6tlruh

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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 8hl8a:wr.ybx6vuz iwl h 4 2s,a table top for 10 seconds. For which time interval(s) did the marble have a negative veloc6i2bsxy 8:h.lrw lh,4uzw va8ity?


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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 motib0s2 8j8(bufaavz3(j h2qpf )6ucwswon of a marble on a table top for 10 seconds. For which time interval(s) did the marble have a positive acceleraacshq3bvuwjw68p bu(0j28zf (2 s af)tion?


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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 describb +te*f)stnah)n * q2zes the motion of a marble on a table top for 10 seconds. What is theq2z**tban)hs+e)n tf 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 for a time 3rvkjknll;6uk +15 nt l4fl*zof $2.00\;s$ 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 sp* ;mw,zli7-bc* l kh8rp6 mghzq2rn6peed 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 followhjg em 4aqpmw+*ilt tq.v-*/ /ing graphs could correctly represent the motion of an object moving with a constant speed in a sj pmtaw**i/+ -q.e4vh m/gltq traight 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 de:ezxwhwji -1*p y*v0wscribes the motion of a toy car across the floor for 10 seconds. What is the acceler1- ** pe:hixjyzvww0 wation 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 tucv,m*py r(/cg/xwxv-1t) dihe motion of a toy car across the floor for 10 seconds. What was the total displacement of the toy car for the entire r,vugxc cd/)-/ *tp v1ymiwx( 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 twya s3xq3lz 9g2)*zee he motion of a toy car across the floor for 10 seconds. At what times or time intervals must the net force 3g)a2 w q*39zxzyl eseon 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/hrq6 z p.25gi 7eth:pkrb to 60 km/hr in 4.50 s. Which one of the following choices best reb e:k7i5hptr.zg p26qpresents 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. Wkp cq((k7cm.0pow99 uodn c;jhich of the following statementsc9; (pccpj9woum kd .n(o 0q7k 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 e2 pg7u70pfpmversus time curve shown to the right.u 2e m7g0fppp7 When does the car have 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 the a o ml6m1hwv;r/ngle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Wmh vwom6l;r1 /hich 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 toward each other.9fc5md u+q2vm5gwk , r5 qku2r,mv+g9 w5c dfm
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 move -d w0jah g(0uioulyhfs9 -.6)dbvti 1s on the x-axis. When the acceleration is positive and increasi6fvls0i h).ud01d (gw j9t a--ob hyuing

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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 veloci2uzhmkh e8o)xiu(+o 7m.ju r)ty 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,dn-- 8 j .fja cdex6sl80r5hpu which one of the following choices identifies quantities that must have the same direction?dcr 60px5 a-du88 -e jnfhslj.

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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 movesyw.x 0+ 1g )(jxeo(gcifpmph6 $3.0\;m$ 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-time7g tw c7zquutt 1(z)k9, $y\;vs\;t$, 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 tra mcqb8n9m dfl)k/j 5i.ck for total time T in two partslifjb 9c.d /m5)mk8nq.
• 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 motir l/dd. (i3h )5gioa,ptuu q5ion of a car on a straight track is shown3)i,htg ul/ d r5uda(5i iopq. 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 vs. time graph for the motion of a car on a straight trac63xcaf ;4za6vdsfu 1c k is shown in the6uzv 3x4f1a6a;d sfcc 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 given bcx)fn b*q lt.t+dp6 tu+gn2y0 y the position vs. time graph sho*0 x )dn+lf np.tuq+tbt6g2c ywn. For what time(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 the velocity vs. time graph shb/ at 7yda0ht*own. For which time(s) is the acceleratioybt *d70a/a htn 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 areq 5 d0f+u,;tsd 99id1e.dixke;bw fema under the acceleration vs. time graph for a fixed time interval of an object’s motion,d1ie;etx; sem99d0d5iq ,kfb f+dw. u 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 increasinlj cd4 :nn4j,*xr3n ebg 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 tripv3d 1lt -a 2 /hb5pwt4rxiov)o 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 res )lb bu(y1p6kgt and reaches the ground in a time of $2.50\;s$. Neglect air resistance. With what speed does the object reach the ground?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.03:A small object is released from rest cwibp+ x9);w5k djwn* 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 sq5n)jm7m e ekiz 31n/*em,-qrhnf 3i a particle moving along a horizontal axis is shown. What is the total distance traveled by the particlqkzm7* 3me e)erh1 /nmi -3i5 fqsn,jne 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 o 3r xa9ji7q2m g9myh,9bo/ xpmf the listed situations for which there is a no7 yi9ba2phq3mr x gx /momj99,n-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 abjv:d,z3.3hgsurer jn 0rkj)ky 297vkp31eklong a line is shown. The object starts from rest a2krn k33v10kvd rgue) k9yr7j. s pjh:be3 zj,t 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 originvhzi0fmvb5arzp//6 xub u6 )s.yx w 65 and its velocity along a line vs. time is graphed)f 5 y5bs6hmx/vp.0zaw zib6v 6/uuxr. Which one of the following 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 a horizontal tl 9+ l/gf+jd))d1 v+uaupyk sbrack, each with constant acceleration. At an instant of time, the information about)p y j 9ks l)l+dub+fu+vag1d/ 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 pod 7wmg:trju8* otig2 0sition $x$, 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 thej1k,;c3za /wgsjbr ( d graph, which one of the following choices correctly describes the relationship between the average speed of t w,s1j/z;bc rdak 3g(jhe 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 describes the instants of ti:no8g a:n lo irvn:jz+w)g 9x: v/xa1wea.2peme, at which the car and truck travel with the saogl8an +.nzwxva wogav ip 1:e:2/ j: xnr:9e)me speed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.30: Two cars P and Q, each start from rest at the origlzcm6w9 r* zxjb )1zvn5r*vh5 in and will move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the following choices c5r wr)* 15lhzzc9z*mj v nx6bvorrectly 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 graphl jh , 7w)j:l9io0fvrd of an object moving on a horizontal line is shown. At what time(s) is the object moving ll7v rj9 :ifoj0)hdw, 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 pra5jj:j --mmmf ovided. During what time interval(s) does the mja j:-mm-5mfjass have zero acceleration?


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