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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: 匿名未登录  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 cir1/ 5 xe+r;2ii isqd ukeyv3zs8cular 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 rkem cec,a 6cwo 5r/vq+1;nj t(p+n6ha particular direc,ern+rqhc(wopk+ n cm c;61/j65aetv tion 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 a 5ax1 e)k,;iejwggm2i+9o:b sxsh /wtverage speed of 50 m/s / x15jo2xewggsi,kh ws)m:i+ t;9bae and then 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. Ife0 9f ueems-(;;pznef it continues, how e; uef;n zpms0ee f(9-far will 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 stationary on a 30-kg+.f cb6bdccz2 plank that is sliding at 5.00 m/s to the right across a frictionless pond. The boy then turns and starts walking on the plank at a rate of 4.00 m/s to the left, relative to the plank. What is the speed of the plank relative t2zc6 fb.dcb+co 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 4v/ yvrll68h9 k00 km at 80 km/h and 400 km at 100 km/h. What is the average speed of thehlrkv 9l/6 y8v motorist on this trip?

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  97.20: This question refers to the motion of a toy car traveling along the x-axqnc3m0y)/ wrm 8r3knxis. The graph shown below is a plot of the car’s velocitqyn)x0 /8ck 3nwr3mrm y 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 o1:cl0yfs 1dc xf a toy car traveling along the x-axis. The graph shown below is a ploc 1cx lsfy01d:t 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 alongorg6s .s d-xz6w: trsa*qbx4 3at(ik / the x-axis. The graph shown below is a plot of theta gsto 3xsbzd q6*arrsx /k.-4 6wi:( 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 +y0b+ .b ppom,e+g/hscjp 0h rof a duck flying due south for the winter. At what point did the d hr0+ ho0pbp/y+bm p. s+ge,jcuck 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 e7xya;.kt41wqwqsppi7 p9 z+which shows the position and elapxy k; wt ep19p77as4qz+p.qi wsed time of a car starting from rest and uniformly accelerating in 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 r iaz1pk,7,nlrefer to the diagram below which shows the position and elapsed time of a car starting from rest and unifo,7,ip 1krlnazrmly 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 sskto c)ne d*6o7h4gf)hape of the velocity time graph for an object with the position time graph shown in the diagram t*4c 7)sfenoog hd 6k)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 elastyrv4: .63w*qynqxnpunje q4op. 7 ui.ic rubber ball is droppepqq64qrn . ny3 vie 74yo:..ju*xupnwd 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 1,4bypim)b ezdy m9u6i xsq4+question refer to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and rebounds to its original heige bd)y94impibum6syx+ z, 4q1 ht.
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 +;1 k2xvaxwiytravel 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 kyk0m9 +qk )porefers 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 fore-xi8 1c.gno: lqbe srx40. 8mx8a q9 hbon7kllowing 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 g3 a0x6weqdiyfv 2e65k) f2k;7xo kplrefers 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.
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 refersyiqtx zb;4e5e/ lg mh) loh;/: 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 hv o6ipf 8(yvd/u.tt p7orizontal table top and off the table edge. Which of the following would best represent a graph of the mag8d. 6i(oytvpvt7u/ pfnitude 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 repryqcx((s j.rnfx*w+ 32:x :;pf fzwps tesents the relationship between distance and time for an object that is moving along a straight li;r3pxzw(fqcjwp y n*xsf:2+ . (fxs: tne. 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 relationshauf(q99qto:klt t :*vv+ 7bx xip between distance and time for an object that is moving along a straight line. Between what times did the object have a non-zero accelerationxakb9vu79tqtxv + otl:q* f:(?


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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 Ear8w;dzo-o2 ov xn.qrbz/ z:t8ath with an initial speed of 12.0 m/s from a position 10.0 m abo/rav8-;dzz x: 28obt .oqw zonve 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 mg7krgv/( ix- e/jegpqb*xp0 87 *lds a toy car starting from rest and uniformly accelerating across the floor. The time and distarm j*pq8*7(bxl7edv/e g/- 0pik gg sxnce 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 r5(ywf3rkk 2n:q)bu v hepresents a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from ku(2h :k vfrn) b35qywthe 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 gd8ph m-/ n xn3xn89dhand uniformly accelerating across the floor. The time and distance traveled fdxg-pd8/h 8 h3n nmx9nrom 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 se0 j+ u:2viibqhows a uniformly accelerating ball. The position of the ball each seconb 0vq:ij+ui2ed 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)o3yp a3nogib+s 9 yz* position of the ball eacsz+o 3i9 o)yb3a ypn*gh 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 8k7znmy9fkh6lt ngvn7dn n)0- 5p3 t la straight line is shown in the graph behnn9p l- v m5tyk0n7k37)6z n8tgnfdllow.
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 clonv3i tvcqr*bd cg n4r0 s1-)vfk10qq1wn on a unicycle moving in a straight line is shown in the graph)4cvc*rkq0vrg3n1ntv - 0 diq1bq s1 f 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 surf bpmbzo2,k;c c77l6s hace 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 grapxd*nfv:6dx o q baxpx8w,x 0+*8+iztk h describes the motion of a marble on a table top for 10 seconds. For which time intepo iv,8xxq*:b0 86dw+afxx*n tkx +zdrval(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 mottf vjiq,yc q7y7 4vg i31kaqvk5:t( ;rion of a marble on a table top for 10 seconds. For which tc qfvt gqt ijv a7kv,(4r7q;:yiy31 5kime 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 dzfoew pdxs2,l m:3 /4the motion of a marble on a table top for 10 seconds. What is the marbles average accelerati/3d z:,oxspl2f m4dewon 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 ed 5-sn.us/ qmof $2.00\;s$ 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 c uq(3ia(ldr d apozo* (2;tt*$20.0\;m/s$, 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 fokqiuxd(o 6n0k+c 1.eollowing graphs could correctly represent the motion of an object moving with a cu1 +id06xeqk co. (nokonstant 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 y*b2swfb :fh28 dps9xc -yr y.a toy car across the floor for 10 seconds. Wh28 wpb-f9y.ybxs2fc r*ds :hyat is the acceleration of the toy car at t = 4 s?


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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.25:The accompanying graph describes the motion of a toy car across the floos5 1juli+*mcz r for 10 seconds. What was the total displacement of tz5+ 1su jli*mche toy car for the entire 10 second interval shown?


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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  03.26:The accompanying grap h+ gs8teqz5ytn l t:)ky.k4;)ugx(ae h describes the motion of a toy car across the floor for 10 seconds. At what times or time intervals must the net force on the toy uszn a5)+qege.l tt8t k ygx:k4y(;)hcar 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. W)d8: g lw u v3-,oldey/t)fihdhich one of the following choices beswtd ), fd-y8ligv:leu 3d/ )hot 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 veu4pnm/7*.6 u :)9 udw nk*vjwyeqbpssly- 5a jlocity versus time curve shown. Which of the following statements rj m:dwn5y-w qsuspa*v9*bnpluejk6 y/47. )uegarding its motion is NOT CORRECT?


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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.17: A toy car moves along the x-axis according to the velocity versus time cj7tk1 ezb fwp +/:ugv*urve shown to the right. When does the car have zero accelerze kpgvj 7: uwf+b/1*tation?


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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, acp) *kcfq vqp+3d;3ox izk ,ll2p5 0pd tennis ball is moved so that the angle between the velocity and the acceleration of the ball is kept at a constant 120 degree. Which statement is q fk;o 5,q32kxzppd+il3p 0)pv* ccldtrue 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 15xq y1,.kh4f bbs0h n0n0 kilometers apart and traveling toward each other.0,0hbn. h4fxbks nq1y
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. 0(o(3(w ab ,j2ukpvommy/e- rbq uko 2When the acceleration is positive and increasing p(3ou,oyw e(m/baj02omqbvk u k- r2(

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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 .f7i ; f5h;9vsvo2vj wsl7/wgeu+mi zof average velocity is

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.18: For any motion in two dimensions, which one of the fo8vo mm8*oy1wllxjg/:llowing choices identifies quantities that must have the salo88ol/yvx m:w*jgm 1 me 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 /g1piml,. huv(,dxorscpt )7g .6 ifd$3.0\;m$ 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, k-oq7 hfg rr,c:2fy6juz+ z7 p$y\;vs\;t$, 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 for ttj s.t)zfh xv u3m3/rr,7v*tp otal time T in two puf) t,s jx vrm3v*th/ p7r3.ztarts.
• 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 fyey9evpx;k +) or the motion of a car on a straight track is shown in the diagram. The thick line represents the velocity. Assume that the car starts at orpxee9y) yv k+;igin $x=0$. 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 gd ps;7g/)dcfvj 9xo, straight track is shown in the )sc/ ,;g9pxv7 gjofdd 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 objeehd18 k(bksk/ch3en uwehe f l4o6/ .+ct given by the position vs. time graph shown. For what time(s) is the spe efew8+4ks(1b6hulce/k . d e3nohk/hed 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 tri5)z0bd4a b) a 0j jf+xpnzb:he velocity vs. time graph shown. For which time(s) is the acceleration of the object equal to 0zbf n)5)j4a0bdz0x+bra: pj i?


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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 accele2jmbk9l+ hj6 mlzl w29ration vs. time graph for a fixed time interval of an object’s motion, what quantity has been determi6jzml w+9lk 2bh9mjl2ned 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 j*g tlem eq2a-7 6yct)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 twogbh 5 z,v(q9 .wlup-c (4ohecqax9i7w 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 t/)*d yhkais6pya6oj b+.f u/ ehe 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 reacg xed ff ,0l)tnnzf*p7)rs.+ ehes 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 partick1x *7sm4*kfjk:smy2yscy g *le moving along a horizontal axis is shown. What is the total distance traveled by the particle from t7s* ykgm2 k : 1mksjyxs*yfc*4=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 choices6fa3: re): f szaya2og*coc; r correctly identifies all of the listed situations for which there is a non-zero accelerationocf32rgfyaer:coa6z as:*) ; ?
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 foruuu(dj58*smpr(btjt*.d 8 2 t6 i vsuo an object moving along a line is shown. The object starts from rest at time t=0 s. At what time(s) does the 8 stidm(oj d.bt6p5uu ( jr *utv2s*u8object 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 itsbrnrn qw13+j 1 velocity along a line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of time for which the object is moving away from the orrn wqb+n311j rigin?


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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 horiz85 )q leyniibu9pz3 zwe2.4o a x)3dyhontal track, each with constant acceleration. At an instant of time, the information about the cars is sh3y. 4il9nbdi3ap8 u) 2e5zyzweqx)o hown:
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 5;*im* l bqixl6l3qk7q zuf e)a 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 grap85b hs t8ywn 1ilnws-g y7s;d(h, which one of the following choices correctly describes the relationship between the average speed of the t8wh ly5g-wiby;ss1 dns8 (tn7ruck 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 followingr4hwcqml 0i 6nd 2oudd o829k9 choices best describes the instants of time, at8 di dmk 2qodohw4ln0u9926rc which 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 wilgb 8es zy1:;qf8jt*fml move along the x-axis. The accelerationfmqst8:*1g jf8ezy;b vs. time graph for each car is shown. Which one 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 a horizrpcq9at9 p /w6s (a5bjontal line is shown. At what time(s) is the object moving wapq t9c5( pjr9 b6s/awith 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 :*b yg5olt4rn position vs. time graph provided. During what time intr 5y :nb4g*loterval(s) does the mass have zero acceleration?


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