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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 rad, e0mfq cmh/lxuk5. /mius $R$, 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 perh(-yie 3:k.v 50y;zonerhgh a unit time without reference to a particular direction he0 nyheazk:yr- h(v;3og.5i 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 tv ks)z50 (acehrack at an average speed of 50 m/s and t v0h(k5e)s cazhen completes a second lap at an average speed of $V$. The average speed of the vehicle for the completion of both laps was 80 m/s. What was the average speed $V$ of the second lap?

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  95.03: A toy car moves 0.80 m in 1.0 s at the constant velocity. If it cont hsrae:st8lo/67 kqb y/de *b6inues, how far will it travel in 3.0 s?k/o* bsyhet rs/6l db a:7qe86

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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 is sliding ycx/f cy-efme4t799qp 2d1jxat 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 m/s to the left, relative to the plank. What is the speed of the plank relative x-ey 7cjpyfxm/99ce4ft2qd1 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/5ke6jmms4j vod6*3d n17f 9ksbr ziy)h. What is the averagedkj s6k4y6j9r5fmm1bv* 3sn i dz)oe7 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 alobfq46cx,a/ :frzr ox -ng the x-axis. The graph shown below is a plot of the cafro- :z 4x/ ra6,bxcfqr’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 refers to the motion of a toy car traveling along the xeenwecbdpw66x 5.v f8,sqj)j * fap v3)hr .3k-axis. The graph shown below is e*jbqf3 ) p a6k6n rpeh )exdv38j5w.fcs.v,wa plot of the car’s velocity in the x direction, $v_x$ versus time $t$.What was the acceleration at 33 s?


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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.22: This question refers to the motion of a toy car traveling along the x-at .c;; axz49mew kqfyyc)x)/ixis. The graph shown below is a plot of the car’s vx )zx) qkyf wmey;i4ac9c;t. /elocity 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 velo*es t)dqhqx1; city vs. time of a duck flying due south for the winter. At what point didhqsd 1xqet) ;* 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 below which shows the positi*b nn2tf iv,o jk0*e20 2pfvryon and elapsed time of a car starting from rest and uniformly accelerating in a straight line. What was the averagn*2*vrpk t,vnyj2f ib20e o 0fe 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 ahcu 0ze.nii 8 2qn:fr2x r8)efnd elapsed time of a car startiqrn.ri zf)ihx28 n f u082ece:ng from rest 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 the p, pcd;wu2x(unosition time graph shown in the diagram at(xcpdnu;wu, 2 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 ques+ va16yu *9b1td jjl wifn(io*tion refer to the following information. An ideal elastic rubber ball is droppefj* ty96wiojluidab*1 v +n1(d from a height of about 2 meters, hits the floor and rebounds to its original height.
Which of the following graphs would best represent the distance above the floor versus time for the above bouncing ball?


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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  00.29: The following question refer to the following inform+qp.(e0 f wrilation. An ideal elastic rubber ball is dropped from a height of about 2 metersr0elq. (wfi+ p, 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 speed of sy6 ndv(o43 t acrz.hr5ljf), $v$ 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 re7 ,rj/r zrm*6+xnxag ffers 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 refvd/mabk:cox+t 2 9r +z+fb zeb)lfy6+ ers 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.
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 scenario: At ev4m fy*a0+ k a:u0yzr$t_0$, 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 rha(zp6ht*o- lxi6l uc 2*rs a/+m ea6cefers 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 horu 3( juxbae+xiw ;hly+g..f.zizontal table top and off the table edge. Which of the following would best represent a graph of the magnitude o.( +xuieyflx+ jh..wuz; g b3af 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 distancevlh+ib:i vui2 +lht/74fc+ on and time for an object that is moving along a strafv4ci+nvbhi 2ti +/+ :luhl 7oight 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 ce ie*(r/ x*oodistance and time for an obj*ocoix (/ee *rect that 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 thrown str0 j nkzs1em*slzfi a784f8ata0sx9 /xaight downward on Earth with an initial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resistanx e7/ mi0 xnfz0akf tsa*s8j1lz9a84sce, 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 repressgc1 jy* he2)8vt)nppy d n+n7ents a toy car starting from rest and uniformly accelerdts )py +env82)* hnj7ycn1g pating 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 belr6z wj0(4l jrt-xy87* iah)krr3khzdow represents a toy car starting from rest and uniformly acceleratinr y3( r4zi0j-8)h6dtkhzjarkwr*7 xl g across the floor. The time and distance 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 t* doc0s/r1q5 cdgad 6g0l6;s on-ogztoy car starting from rest and uniformly accelera0 r0;*g d gos/ tac-coddz5s6ql1o6ngting across the 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 acceler0ta. p8*-fvt;w uzum hating ball. The position of the ball eaau w8f* mv0;.pt -hzutch second 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 uniforml zad4 :/+.h* ocgqymcplq4kv6y accelerating ball. The position of the ball each second is indvq l+dm4/cz:g*4aqk hyo. cp6 icated.
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 lin7 h:lq1m p+eygu(:5zu4sfih oe is shown in the graph bm (4uopsgzf 57u :iley q1:+hhelow.
What would be the acceleration of the clown at 5 s?


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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.18: The motion of a circus clown on a unicycle moving in aieb .m:nm-s,8,uxnwe straight line is shown in thmnsb8i eu wn. ,-x:em,e 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 vacukx cp 53ju9l4pum 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 grab:ai:rk+j 2+-7ea7ipw y u qraph describes the motion of a marble on a table top for 10 seconds. For which time interval(s) didi-7pr :a+i a aew2uq+y7rb j:k 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 motion of a marble on a table top fo7bf.q8a+ a)w bxmw fz1r 10 seconds. For which time interval(s) d7fwz8 a)bx+mawb.f1q id 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 descrkzuf79 pm/ qeyh* yr)5ibes the motion of a marble on a table top for 10 sec */5k zmf9yhr)p7euqyonds. What is the marbles average acceleration between t = 3.3 s and t = 3.8 s


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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.20: A car accelerates uniformly from rest for a timqjxk54jje n1g;8qwoeu , l9+je 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 straighd/ 3rh l/hskg3t 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 fol *o.1 lmzd*yqbee2lf1lowing graphs could correctly represent the motion of an object movi f*. 2q*ezlme db11oylng 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 accompanyingp)lrj.xsk7 ; +is vtr+ graph describes the motion of a toy car across the floor for 10 seconds. What is the acceleration of the toy ca)xpt7 jivs.+ls +;krr r 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 desco6ng) 4ogs2rr q;.o ceribes 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 secon2eqnog.r) 6;rsgo co4d 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 descre- t rm5ws6dw7r6ej*m5v tq:x ibes the motion of a toy car across the floor for 10 seconds. At what times or time intervals must thetrerjm*w5wm 7v qt:s -566x ed 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 8* zrqtlad7 lf6sut3bx u0f/;s. Which one of the following choices best represents the acceleratiou;/ufslt* f x76dt3qlr08abzn 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 sfh7 smk 5:nqllksp8i) qa5g7 -hown. Which of the following statemhpkf7l:lqi)kg-sam8 7q 5ns5 ents 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 accordin7dwb 6ycrzty9 0yb*(7* qe8m ;qeoprtg to the velocity versus time curve shown rc q*7m6pdyy8e0be;q9 rb7tw oz*ty( 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 z2h(go0b 0n8jg h.5a0brup vbof time, a tennis ball is moved so that the angle between the velocity and the accel(ar 2b0ju n0bg .ozvhh085g bperation of the ball is kept at a constant 120 degree. Which statement is true about the tennis ball during this interval of time?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.03: Two automobiles are 150 kilometers apart c n5bl vs-pt3h264h1dw k hw4rand traveling toward each other.4p4s l1 d-36vw c hbht52wrhkn
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 posit 1m:hc,vy/ds vive and incr/dvv1h:mc ys, 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 velocity is2xhux 4h; b-wh

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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 followianiwry vrl vr4ku2)tf kev *24k2; *t7ng choices identifiev a r); k2tvtr wi2*v4*l y24ukern7kfs quantities 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 7 7ufj0 0x.e4fhpvcbreqw (-j$3.0\;m$ 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-timrqih .i,r3 wai7a6 a0de, $y\;vs\;t$, 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* vny:gcelu )+rs s v9r5d2(ff along a one-dimensional track for total time T in two parts. vvr (:u c +nde9r2yfs)fs5*gl
• 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 ca9s/yo x2n *zhmr on a straight track is showoy*hmzs9 xn/2 n 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 gc65z cl z)l5pvraph for the motion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume tp55lv6zc lc z)hat 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 te:8me(ncf; 8t m+ y.a(cqtsyshe position vs. time graph shown. For what tinaytc f:c;+ et8m(ss(8q.y emme(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 grap1k 0wz- b5 gckis/s6rgh shown. For which time(s) is the acceleration of the objec0bg igs16 rz/c5wk -kst 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 acej.c)zo.y*jh c0a: 1 t.3srvfdzlz1wceleration vs. time graph for a fixed time interval of an object’s motion, what quantity has been determined for tharcd jv s.1zt zfay0o.:l*wh1jz e.)c3 t 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 incre.zgab 1bd;(l easing 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 two partwn*nkgb *c *k*q2mkc qu*u,z) s:
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 relq*n s n4nf;h/k)zf(vr :iw 4aaches 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 mmbv3ds8y j)8s 6mo)2we*igy is released from rest and reaches the ground in a time of $2.50\;s$. Neglect air resistance. From what height above the ground was the object released?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.17: A position vs. time graph of a particle moving alo9m/4tl .8xcgfjt3 dxde tm.z9ng a horizontal axis is shown. What is the total distance traveled by the particle from t=0 to t=10s ? mx8t.d49xj fz dlg e 3t/.mc9t


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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 listo2o 9 dfi bku*6m)mt7ted sb kt6)o9 mi*f7 umo2dtituations for 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 object moving along a line is shown9j, r emmrs78t/gbb n). The object st8rb m9,s)/be tmn7gjrarts 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 3jyqkk 05cp 7dzzsz+ (a line vs. time is graphed. Which one of the following choices best 5q(ypkj3c+ zd 0skz7z 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 hori9 1hiea 5yhp,wzontal track, each with constant accelera h,wi1a5yp9h etion. 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 position 5fz+xy7zkwq g3b+ 8kr$x$, 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 choiz jntu 6kh4*m*ces correctly describes the relationship between the un*km6j4*thzaverage speed of the truck to that of the car?


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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.42: Which one of the following choices best 2(y*dxzgrk-2ztgbxl4nce 6 vqw70; l describes the instants of time, at wn2z-;6kqwv( l 2c* ex7ggt4b0 zd lxyrhich the car and truck travel with the same speed?

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70#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  17.30: Two cars P and Q, each start from rest at the origin and willw v v-;9/m( niuzpt)q x3srb.u move along the x-axis. The acceleration vs. time graph for each car is shown. Which one of the following choices correctly identi3rumbvq.-s )izp;w9 (n/ vt uxfies 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 a horizontal line ,rg 0m;aeuqr/ is shown. At what time(s) is the object moving wi;qmguarr/ 0e, th 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 pu za (mfwa/ki,8d:w0u rovided. During what time interval(s) does the f8(dm/wu :a,z0ai w ukmass have zero acceleration?


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