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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 cirwzfkg* usnx 06jc1thja(04 w(cular 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 time without reference to a part-wc75wl fo v) m5k9wbuicular directio 7 -5mfw wuk95)cvlobwn 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 circular track at alb2yj6yhvu/ o 4+po7an average speed of 50 m/s and then completes a second lap at an / 7ubolao64hy2+yjpv 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 0.8 * zoh4fn:h:tu0 m in 1.0 s at the constant velocity. If it continues, how far will it*f:: n uhhotz4 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 plank that isom8a s)mcyxr1y0*l5o 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 0mx sc8lo5mor1yy * 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. Whatw9 k-6q na x*nwjti w)2w91frn is the average speed of the motorist orw6 219wfkj -)q*tnnn9wi ax wn 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 remwapbor:n5si- g4+vv29k3o l fers to the motion of a toy car traveling along the x-axis. The graph shown below is a plot of the car’s velocity inw+3gsvo 4 pl5 i9-2a:v bonrkm 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 refers to the motion of a toy ca s dy+:e *i:hgtxol(v,*s0c isr traveling along the x-axis. The graph shown below is a plot osig*0vsh l e+:s:x*,yc ti( dof 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 motiop6yw) qh-aue9h ; p2pnn of a toy car traveling along the x-axis. The graph shown below is a plppqw u2 6 hh)a-y;epn9ot 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 obxsl; p ;z1 a br8)kjk:e:k)ga duck flying due south for the winter. At what point didkk1;r8x :oplbz: ;a bksgj)) e 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 diagrag1 ygg8cz0zl 81:xn tum below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in0l g 1gcygu1xzn88z: t 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 the position ao8r 3z):wti vgnd elapsed time of a car starting from rest and uniformly accelerating in a straight vgw:to) 3i8z rline. The average acceleration during the entire 3 second interval is closest to


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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.20: What is the shape of the vegbz(j z l 0)nn iq3dgd5c7)kmn *mrq,3locity time graph for an object with the position time graph shown inlqg n i dr 3,m3)0d(*j)mngqzz5 kc7bn the diagram at right?


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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.28: The following question refer to the following information. An ideal elaw b4d9 e.spe+*;s jxvgstic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds9 x;g*sd+s peejv4b.w 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 questionv5 /qagowb)q0w ,d;ypg /tqd: refer to the following information. An ideal elastic rqa,w; pgod y/05tqd q):bwvg/ubber 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:ln d qxwz)s9gjd, 4f7 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 1v1*6+zlrbxu e;52po g tzq fxrefers to 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.
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 -pl lsl(11 afdfollowing 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 tow4d*sn9tw*y g4rjj +iour3q9s b8 y8a 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.
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 r/jyt -t)rqoziiyz ) 7aq.lxp 8-56zmuefers to 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 horiz n;s nt7o:)piyontal table top and off the table edge. Which of the following would bt )n i;7py:nosest 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 distan-5qkq/yc u4flbi y5v9ce and time for an object that is moving along a straight line. What is the instantaneous speed of the object at t = 5.0u f/bv -5 qqck9ly5yi4 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 f7 l8c 5r)pqrg7q*vhl u*3xnueor an object that is moving 7u3r*7 *x8)pcvulrqhn l5 q gealong 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 thrown straight downward on Earth with0pjoaa 5:md sp2wl k+- an initial speed of 12.0 m/s from+ps- a 2adol :w05mkpj 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 represents a tozgxn2 q -h - lhoe/dhd..o6c;hy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start are shown in the diagram. h.dz- n -/h.6locohqxe2g; dh
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 f/qtnu vs/f1 e 1,ea)rqrom rest and uniformly accelerating across the floor. The time and distance traveled from the start are shrv a q//e)en,1u t1sfqown 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 represent vs*/f (bo1b8esftken8)ki: bs a toy car starting from rest and uniformly accelerating across the floor.kt *vse n1f/bo88i(bfek)b:s 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. Thtdsas9r.mw)a:/z tw) m-wf l-xf6f*v e position of the ball each second is in-mt /avf9fzlr:w s -)ww.*t fm)6 sdxadicated.
What is the average speed of the ball between 3 and 4 seconds?


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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.09: The diagram shows a uniformly accelerating ball. The position of the z,,ol- el+jkf:)rj myball ejyk l,)ejm+f o :lr,z-ach 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 unic(z(e6 0vqm137amx6l sld ooc orm:)bgycle moving in a straight line is shown in the grapx6smcovmb73mla q 1o l)6 (0(zdrg :eoh 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 od k, m af.w:0i xtd0,.d,sq: jypuf,cjn a unicycle moving in a straight line is showf, ,ay j f,0mpuci0dkdx,j.sq.t:: dwn in the 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 hn,/ajel n2rr+5jrse ;xrr75freely in a vacuum near the surface of the earth

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.11: The accompanying graph describes the motvpo 2 6f gzkdbdppb6x(j(7k*m :wb)y. ion of a marble on a table top for 10 seconds. For which time interval(s) did theb6 pjx(:g*7po pv)kw62 ( fd dzbmb.yk 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 rrp+cxvi:e) u5rqx,v5 )cc0tdescribes the motion of a marble on a table top for 10 seconds. For which time interval(s) did the marble have a positive acceleration?5ptvx r)uv:,e+xc0 ircr5 c )q


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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.13: The accompanying graph describes the motion of a marble on a table tuwp+xy/6/k 4n. hvwh cop for 10 seconds. What is the marbles average acceleration between t = /ukhw/yc6vx4w n. p h+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 u4 jkqc22c6e ahniformly 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 n*8yvaoj6 dz (7hfi.1wd+zm(0rjv ny $20.0\;m/s$, 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 w2is ddd5 cq+odl2/4pcorrectly represent the motion of an object moving d+dis/qo2 4cwddp5l2with 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 a toy car acr s 4t1w,p7u m3;l uszrz1smc,noss the floor for 10 seconds. What is the 4p1,u lz7cnszsmw m 3,rus1;tacceleration 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 descriwqp s2u4,10/u7 osy j prj+hqxbes the motion of a toy car across the floor for 10 seconds. What was the total displacement of the toy car for the entire 10 second int +u2p14 sprsj7qyhwju,q0 xo /erval 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 toy car across s0dk:,;z ewl wthe floor fore wlk w,;d:0sz 10 seconds. At what times 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. Wi an-(ubzss /.hich one of the followi.ibz- s n(usa/ng choices 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)i95.5y+ ye1c .hkw)vomnl ugx9c xfv shown. Which of the following statements regarding w 5y.9x1oh uc n5 il))v+.vmxkyfe gc9its 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 toe zwruqk+8)ci v4 8hx( the velocity versus time curve shown to r (q+izv)e8 8hucxkw4the right. 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 anglw:*ooet q/1 cfrvru.u *-ay *,er leh0e between the 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 tie0ae eyvwo r*.l/u r*,t qh rocfu:-*1me?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.03: Two automobile:tr stc)3xiaa0s3r2s7fa2p mw 3. myq s are 150 kilometers apart and traveling toward each other.rcr fxw:i 3qps3t2a m.)s am7 s0aty23
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 accele is54no:jbi1dration is positive and increa ii4j5:bno s1dsing

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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 vg)2d). bgmsq xelocity 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 fo, mi yjcba 3fl73s56wdllowing choices identifies quantities that must have the same di3jsb7m ,5ciwl36y d farection?

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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 moveot+kin0dc+ey9- d n9x bi0nx)s $3.0\;m$ 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,6tn sn mw7ljj)zt:qj:i)2+kl $y\;vs\;t$, 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-dimensio. q/ke,rtsp2;g5i qcd nal track for total time T in two parts. .2dr/g;eqtps5 , q cki
• 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 ofr;vz j*)p;64zay h uwp a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that the car starts at origz 6pj)v zyp h4r*;auw;in $x=0$. 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 thw:0qrh .ascz t +q1gmi8 crz)-e motion of a car on a straight track is shown in the diagrqw c)ma+r:1t hzcq- rz8g0i.sam. 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 by the position vs. timtylr:nfo4l z-vv(x1l 7i * -eee graph shown. For what time(s) is the speed of the object gxll o n-y7ivfe:*etvlz1 4( -rreatest?


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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 2,vympu k2 hw0+znc.kgraph shown. Fo,wcn.ky0p zv+u m 2k2hr 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 under the accelerati9 bc pw7mclb*)eqp+9con vs. time graph for a fixed time interval of 9 q)pc c9mb7*cpwbl+e 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 moves alon s7fb 3o-lnt1a(f (p m(nq.xwhg 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 in hk vux/oq 550otwo 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 reaches the ground int0*wop0un:i c z66c4sqj ,ov j 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 h( . nqgn9igk4is 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 ho1:uhoy ro97qhn ;1ge srizontal axis is shown. What is the total distance traveled by the particle from t=0 to tny1us;1o erh 9:ogq h7=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 fol28ek oe4r3 jre /o(qq6,p9sfi)c jlux lowing choices correctly identifies all of the listed situations for which there ise 4e,qrro 62s)8q(ec jxijk /uplof93 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 +gqs95 59mw j0+ng 9weoruwrszfih7:along a line is shown. The obje+9er0 u5 7wh 9iwso9:mq szjwrfgg5+ nct starts from rest at time t=0 s. At what time(s) does the object attain a maximum displacement from its starting position?


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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.17: An object starts at the origin and its velocity along a line vs. time w 6cwo.jfn7j 0s7w:e9omed-fis graphed. Which one of the following choices best gives the propo:sj7 0j96w. emofcd-ewwf n7er 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 trm8 9 g4ei8oq 05cgj bafqk+3anack, each with constant acceleration. At an instant q ie088cmkab+ 5nq gga3 9f4joof 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 azuk..df aq.(r/ 4 ixrs 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 the graph, which one of the following ch 5:jsr2u :fckxoices correctly describes the relationship between the average speed of the truck to that suf j2:5 ckr:xof 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 e5r3f, :oqjr :ogk6ru time, at which the car and truck travel with the same speed?r3r 65r k j,o:e:oqgfu

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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 fro2-p rwifv3+ m p 2pe;d)o9n) r*qpnyo0y fc7wym rest at 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 the relationship for both the sp3er c)w +ry2pvyo ) ff9n -0 dqwp;p2pym*io7needs $v$ 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 movin4:,hmsfzdoj)1v jy +(f* lyr lg on a horizontal line is shown. At what time(s) is the object moving with its f1vj(ld)l*o+s 4,:zmryjh fy 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 followin0d9 hyqkouhh0c,eemwy/ y+-l3 n ; y/yg the position vs. time graph provided. During what time interval(s) does the mass have zero acceleray90w+mked/3 n yhyu0 ye,h/h;qc o-yltion?


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