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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 spe43.cnpen zr+ op,gp20pd:d9aylh q /hed around a circular path of radius $R$, if the particle makes one complete trip around the entire circle, what is the magnitude of the displacement for this trip?

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.01: The change of distance per unit time without reference to a particul6 zkemfxn8,b 1ar direct,nb6f1xkem 8 zion 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 an average speed t vy96 yzd5wg3of 50 m/s and then completes a second lap atwv5d 6gy z9ty3 an average speed of $V$. The average speed of the vehicle for the completion of both laps was 80 m/s. What was the average speed $V$ of the second lap?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  95.03: A toy car moves 0.80 m in 1.0 s at the constant velocity. If itz +/r4bzcref(;+ fg rp continues, how far will it travel in 3.0 4ez ffgb +rrr+;p/cz(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 3*yx qyr.2aw0 j1dve,czlg5 oon a 30-kg plank that is sliding at 5.00 m/s to the riyr2 * gxaw .,c1z530eyjdq lovght 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 travelozg*aunyz424ntdd. 0qg20hcs 400 km at 80 km/h and 400 km at 100 km/h. What is the average speed of the mogn 0zgoqy *a 4 2.z2h0ndu4dcttorist 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 **v2n; ) top z1k;mi(pfi9wqi7s dghqcar traveling along the x-axis. The graph shown below is a plot of the car’s v *ihfk*(;7n)2p19t dso ;izim p wqqgvelocity 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 refert8+h: )ee0 kd6gy hnu4cto al+m kk/9hs 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 direcgtduc)9elkek/+0 h: + 4nat 86hyhk omtion, $v_x$ 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 card,hj3pz wy)n2+0ewwx vazhd6/o 5tg* traveling along the x-axis. The graph shown below is a plot of the car’s velocix2 wo 5je 0p y*ztzwha +w3hndd,v/g)6ty 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 etw3 ,a(:*g lezpk4zl6p 0hbithe velocity vs. time of a duck flying due south for the winter. At what point did the duck stop its (a :iletl6he3k*pw pz4bz,0gforward 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 the posithq2z b/*g 6r,f bnjg7fion and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the average veloc ,/bbz6fg 72fnjhgqr *ity 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 thr*o*snt+rlrye4 .6s7th *u m ne position and elapsed time of a car starting from reh7rlnse*t mn 4oys6*.r*tu+ rst and uniformly accelerating in a straight line. 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 velocity time graph for an object with thpcf b3ylwkg7h jc -.-7e position ti.gpl-j3hf bwk c-yc77me 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 information. Awk0t9 o3ja tl5fh/:gyn ideal elastic rubber ball is dropped from a height of about 2 meters, hits the/tfa:hogykw j50lt 93 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 refer1cw,z:-qof pca+7ly g to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds q7zpalw-1:c fy ,gc+oto 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 speed o 66sm-5wfch yhf $v$ 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 -:e,xnm(s;zt wxz4y z8 m(+(n bdccwl$t_0$, 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 scenario: Ah9hb+a8j*kstiy (it ,t $t_0$, 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 scen0kx w rfrt707xario: 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 follt*q jyo/m+w8m+xl 4w oowing scenario: At $t_0$, two cars moving along a highway are side-by-side as they pass a third car stopped on the side of the road. At this moment the driver of the first car steps on the brakes while the driver of the stopped car begins to accelerate. The diagram below show the positions of each car for the next 5 seconds.
If car #3 continues to constantly accelerate at the same rate what will be its position at the end of 6 seconds?


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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.33: A small ball rolls down a ramp, across a horizontal table top and offs2(xy ;yb 5rqh the table edge. Which of the following would best represent a graph of the ms( ;qrxhyy52 bagnitude 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 relatewyl: irw,w(t 1eph l8h:x5:* zguev)ionship between distance and time for an object that 8x:we)hwill5*tege(zwvyp : , :ur1his moving along a straight line. What is the 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 the relationship between distance and time for an ozp2u0n/ r -* qpm1owpobject that is moving along a straight line. Between what times *pzpqr0p1 o/unmw2o-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 downward2p wj-ncl8 d:)ryq4ni on Earth with an initial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resistance, the speed of the objectcl )yni2qnpr -dw j48: 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 stpgy 5h4hbovfaxb-2,0;bh f y /t p8dg8arting from rest and uniformly accelerating across the flov4hgfo2gb/;-yh,ypab8 8xd50hb tp for. 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 uniforrng xa29l*xr2 mly accelerating across the floor. The time and distance traveled fro*n 2r 9gx2xlram 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 and uniformly 2v9evo lg/1ty accelerating across the lev29g/ ovy1t floor. The time and distance traveled from the start are shown in the diagram.
What was the instantaneous velocity of the cart at 96 centimeters from the start?


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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  04.08: The diagram shows a uniformly accelerating ball. The posi:1bqcw(k/8j 0fq.se7ie xsf ytion of the ball each second/ffs0jwe(ysb 7i1.k 8cx e: qq 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 accelerating ball. The positm. ,mewq0a1ps ion of the ball eac msqe,a .0pmw1h 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 unic9n . rr)n-b-h) b mt+hxlkq b-nio0s-gycle moving in a straight line is shown in the graph below-nn 9molr0g)+.xb-b qbh-k- n s)irth.
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 clownnjam9rzr3xi ;w)m9 q** i/prx on a unicycle moving in a straight line is shown in the graphrwamj /9x;*r r z9)ip*3 imnqx 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 nef9 ) aflutv3d/d:-yv ear 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 motion of a marble on a t -i- dvxwjmg0:able top for 10 seconds. For which tii-w gxmjvd0 :-me 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 the moti; mc3q9q8yygrr21n0ng( fz oqon of a marble on a table top for 10 second91qznf yyn8r;g2c qr0go mq3(s. For which time interval(s) did the marble 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 describes the motion of a marble on fou86xt :x2dn 5* umh (tn3f3l;pgkhya table top for 10 seconds. What is 33( p5yh6mftud*;nnt2gul: 8h xkfoxthe 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 of fkr)cz-or i.4s62xtg $2.00\;s$ 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 speed3+s a n6cp -lmopmde2) 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 grn9dp(: ,dae(gd 2sjkxaphs could correctly represent the motion of an object moving with a ,d a (d2: de9nk(gsjpxconstant 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 granlmk: ,q-/ s3qrrhyr: ph describes the motion of a toy car across the floor for 10 seconds. What is the acceleration of the toy r hnmrqlysq,:/r3k :-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 thukw7l kw1tw+jl ftd5l c 5fy6c6z 6x65e 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 fk w65y1c f+ ktd cljz6u wl765t6w5xlinterval 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 tv)(3 a 7jrt5qs k)tvnfoy car across the floor for 10 seconds. At what times or time interva nkr att5f))j3vq7( svls 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 h/q v/bwa(z)syu8 b,f9,fyix0 km/hr to 60 km/hr in 4.50 s. Which one of the following choices best represei8) y ,,(vyqau/s /fwzx9bhbfnts 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. 1 0t7f2j3 iboiy; tb nlsco;a4Which of the following statements regarding its motion is Nnji0iya tfo t b; ;obs327lc41OT 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 alongwgsngz1z/ y4p(n .r/j the x-axis according to the velocity versus time cur4sj.//r z1gwpyn n(zgve shown to the 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 movef8ctyv ryowtp..rn 7;09ngl.ac(t e, d so that the angle between the velocity and the acceleration of the ball is kept vf.;wtn,en8l7o(r 0 .c9gt ry.cpyta 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 ) ok46l 1wsazzand traveling toward each other. 16z z)w4alkso
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 1x+ t0ph:ip- yp nk/ t5srn8uhx-axis. When the acceleration is positive and incrptuy 1+sh t:i0nn8pkp-xr5h/easing

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.12: The definition of average vel; blczdb4 t5k)ocity is

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.18: For any motion in two dimensions, which one of the following choices iwyu+5gsg o5o6- y r2 n*x,eivndentifies quantitiesx6so u,g- n*vy 52yo+ g5iernw that must have the same direction?

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.17: A toy car moves i/: zb p+uwsaf.w+ aj1$3.0\;m$ 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-timlp2 c/yd1;/7g- ujwihoey y m)e, $y\;vs\;t$, graph for the motion of an object is shown. What would be a reasonable equation for the acceleration that would account for this motion?


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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.31: A car moves to the right along a one-dimensional track forzt4isn m( ,y)s total time T in tw tim(s y,s4zn)o 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 gr4) g ixr3gduiuzq82zs k/-i,xaph for the motion of a car on a straight track ir,g)ud4igzi2i-xz 3qx s u 8k/s shown 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 9x kxigvu rj +xfb62+ 9b:p(tevs. time graph for the motion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume thatb9 i 62xxbt uvegpxk j:f9(r++ 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 grahoesoi -9s68 zph shown. For what time(s) i -s698oi sohezs 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 ahv 3vw z .k6gmayqsi05;yqla.89sw 8given by the velocity vs. time graph shown. For which time(s) is the acceleration of t 0qg w89qs36;hs.5aikvy zalm a .8vywhe 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 acceleration vs. time g c5pmd:dgt;q y,mh4y0raph for a fixed time interval of ym:pct hyd05gqm; ,d 4an object’s motion, what quantity has been determined for that object?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.08: An object moves along a horizontal line witg8 cluyr 3,j(bh 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 tr1eyq dp)c f.j7mbb39-5fh u wjip 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 frjoitr1- e5 g,a2kke8u om 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 is released from rest and reaches the r1dn38tf)u:7 d uh x-cjcr 8ebz )m5tgground 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 a q*yr+ dqdh7 :fbf3til+bo8.slong a horizontal axis is shown. What is the total distance traveled b hydoqb ff+btsql:i.+d783r *y 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 th qhc;ii(,5yliqz4 6 wde listed situations h;i(lzi4 yq5 iwqd,c6for which there is a non-zero acceleration?
Situation I : A point object moves in a straight line with increasing speed.
Situation II : A point object moves in a circular path with constant speed.
Situation III: A point objects moves in a circular path with decreasing speed.

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.32: An acceleration vs. time graph for an ob3j8j8ay gi h8vko. zu/ject moving along a line is shown. The object starts from rest at time t=0jhjv8gk 8yu8a./ zi o3 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 aiiwh;jlzm nhhr*o4z5 q26o , -long a line vs. time is graphed. Which one of the following choices beiow5l,h*4o-6m; hiznjqh z2r st 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 track, each with constank:b aowj++uhxnq+ 8n +t acceleration. At an instant of time, the iqj hb+nn+xu+ka+ ow8:nformation 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 position6c czllo5 1ye( $x$, 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 showy*ua:8k. sfgtin rf )+n in the graph, which one of the following choices correctly describes the relationship between the average speed of the truckg*8f): ir+nyt aks .fu 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 tn /4 pg/4dlaowime, at which the car and truck trl pad4/gnw4o /avel 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 at the origin and will mov5 q pnm9dpzpu9sm;i1 l(: w/d)v8ikofe along the x-axis. The acceleration vs. time graph for each car is shown. Which 1: dm;9lpo( 8n)5 dmkwq/s ppf uizv9ione of the following choices correctly identifies the relationship for both the speeds $v$ and the positions $x$ of the cars at time T?


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71#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.02: The position vs. time graph of an object moving on h g-m+mr-- 0sgythga +v4k wpba;24s j2qgl(da horizontal line is shown. At what time(s) is the object movi0-( bgg-majs2 l4k r+qdhh v g2tw;-ay m4s+pgng 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 pb)ryqewfnh0) l31 jk :k:b/bf rovided. During what time interval(s) does the mass have zero accelerah /:kbkbr1) nb: qe) yw0f3fljtion?


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