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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 vzs/k3mv9f xcq*q;ga )bx t::g,a ja3 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 wit,7pox 3yvskxg )v r;mfg:g) 44ky in)vhout reference to a particular di:kg 43 )mv7opkrgsgn v,)f v4xi)yy;xrection 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 averagtxer 4i02wd ,ie speed of 50 m/s and then completes a second lap at2rie ,0tiw x4d 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 conuf5v n;ltmn/quo /0 w(stant velocity. If it continues,n0 /o/n ;uwtuql5(vfm how 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 2c2l nhji78 tg-:lvsz-kg plank that is sliding at 5.00 m/s to the right across a frictionless pond. The boyhc8:tjz2lgn- isv27l 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 travels 400 km at 80 km/h and 400 km at 10g-b ;gj pb.i+tj,z 8o+m 7yu0;6b w0jnsciy li0 km/h. What is the average speed of tn8w0i.;s i+itb0z+ obb;ym -j ljgc7yg,6jpuhe 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 835g,/p uly ma*fi, cj2sx nxxof a toy car traveling along the x-axis. The graph shown below is a plot of the car’s veloci2y xlfp5g, x,nauj ms8*c3xi/ty 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 ch la (0h b2*z:hsj hj2jjy1nz1ar traveling along the x-axis 1s1(hhjhyjh0a bzjl*z:jn22. The graph shown below is a 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 m9fd, maxgi1 uy77a 87q3hnbyy otion of a toy car traveling along the x-axis. The graph shown below is a plot of t7hx g87,9yy quyma fni73db1 ahe 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 therqq2k:uq1p0 x velocity vs. time of a duck flying due south for the winter.rq2ku1xpq: q0 At what point did the duck stop its forward motion?





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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.17: This question refer to the diagram below which 1ucyrt3/je8 , t aupr j0++y9qyfk9v 8at0p woshows the position and elapsed time o0 yr31quyovke8+ p0t9fc y9t t,wpr+uj8 aja/f 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 refer to the diagram below which shows ml 9/z p*.krlzthe position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleration during the entire 3 second inrp .z*ml lk/z9terval 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 posii i;/) kva:kmltion time graph shown in the diagil ;:v/k) imkaram 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 qr47. rtnos(gh uestion refer to the following information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the n (rsrh4 o7g.tfloor 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 ijbo 6sc1qixrr a9pu; dr m.(o2o.u u53nformation. An ideal elastic rubber.( r69ur2op s oou5jcmi 1;arbdq x3.u 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 travel wi s7.phrv y5)ylth a speed of $v$ in still water, which of the following trips will take the least amount of time.

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  01.01: The question refers : ip fek+o;tx6to 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 fol9l a,ft2r+ znn) o 2)1w oqiekj)paz-llowing 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 scenari4vb1+b)n /nwnro jq5j visk9-hk1 g1ao: 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 following scen(kl fjl8*6k(nfkn3 aeario: 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 do6/jdhjr l5s(p0g yfg 0wn a ramp, across a horizontal table top and off the table edge. Wyp06(h0sdjjl5frg g/ hich of the following would best 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 reh8sn*mmumme c.6( lr42 w qxu8lationship between distance and time for an object that is moving along a straight lin8hmm u4(umw q*s.x cm8lrne62 e. 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 thpeb1oqcd v 4:/, 4ixsve relationship between distance and time for an object that is moving along a straight line. Between what dcoixse q4:/4bvv 1 p,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 str 4jdlo nry/p3;aight downward on Earth with an initial speed of 12.0 m/s from a position 10.0 m above the ground. Ignoring air resistance, the spd/n ;lpr34jy oeed 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 toy car starting from rest and uniformly atd;bsv ;-9hm4tol x8cccelerating across the floor. The time and distance traveled from the start are shown in ox8tl mhbs c;;v- dt94the 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 resriov jq;*y8x1 t and uniformly accelerating across the floor. The time and distance traveled fo qx ;y*j81ivrrom 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 represewyq 1 .79ovqvents a toy car starting from rest and uniformly accelerating across the floor. The time and distance traveled from the start a w.vyv qo97e1qre 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 s vaxusm 70v;;s.whjx- h gu5e7hows a uniformly accelerating ball. The position of the ball each seconsmuu5; vhhgx e0-7w7vsj a ;x.d 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 ab5j:m5nb v,gs17zr4.jwd khsccelerating ball. The position of the ball each secons5n bh7,wbgj m41:z d 5.kjsrvd 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 gofejnm tn 7mrgg;be*.l )9u*g53 r)ea unicycle moving in a straight line is s gb5*tg.)gnom fl7emjre)3ne*9r u; g hown in the graph below.
What would be the acceleration of the clown at 5 s?


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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.18: The motion of a circus clown on a unicycle moving in a str(dy/nka7;dzk j2(kgz aight line is shown (da jz z;/2d n7k(ykkgin 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 faluglaojvg. r1ihod 2a1 kj-1ak4 l7.9tls freely 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 x 24jhob6nbflz4;gn : the motion of a marble on a table top for 10 seconds. For which time interval(s) did the ma2;jf6nh4 gb z:on xl4brble 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 accompanyine(6awgoyea0ch nj;fg zjf:*idh /*)+ g graph describes the motion of a marble on a table top for 10 seconds. For which time interval(s) did the marblce;fzw f+h*h a n(ed*i6gjo:yg )0ja/ e 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 a tabl k92 +deao-5momh5op mxw4 xr+e top for 10 seconds. What is the marom5k2wohroaxem+m95+ p 4x-d bles 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 unif wa 9umdp bp+.v);mr/nu u,o4lormly 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 sh ddc1g s1a/(p--jins mgh bk9z6mb21peed 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 gr ;o.ir:pir tqf b51e0n xpk0xx0f+ta 0d(uq 7waphs could correctly represent the motion of an object moving with a constant spe d010fpxpxttxai0bq r.:n7w+qu rke (;o0if5ed 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 45o(4)x r+fxd*8 ems qjvp5 l.ifccntof a toy car across the floor for 10 seconds. What is the acceleration of the toy car +nf)mc*cx8esl(tq5 f 4vp.x5r 4 joidat 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 motd(nou5, c6p vhion of a toy car across the floor for 10 seconds.(puc ,vnho56 d What was the total displacement of the 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 graph describes the motion of a toy car across xv3e hunctwwcod;nl8 mvk,50-h i) +(the floor for 10 seconds. At what times or time intm8ncuntov(c3hx0 d -+;i , whwkl v5e)ervals 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 tc, :fih vnydr-6:pf2v o 60 km/hr in 4.50 s. Which one of the following choii cv,fnphf2y6vd- r::ces 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 vel5g,dc5 gkjsv2ocity versus time curve shown. Which of the following stateme5vjk,c2 5gg sdnts regarding its motion is NOT CORRECT?


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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  07.17: A toy car moves along the x-axis according to je12uqnm r 36fthe velocity versus time curve shown to fr6m qu1j3e2 nthe 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 movebo6 a *e,kw,ond so that the angle between the velocity and the acceleration of t e,wa on*k6,obhe 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 and traveling tow0dtli m;*bc;et rp5 hu3def:7ard each other.e :*;;t3 icrhde7tlmbp05fdu
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 iypc; ax+5 kuj+:m 1 ih+2lj6br5q ijkms positive and increasyi +5mj:5xki2k 1r jap6lub jh;m +qc+ing

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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 velocitm-nlsq/6p mw6 ai2 me)y 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 nj7ghasl v w;h7451 8i*pbiq dof the following choices identifies quantities that must have 7hv18spbn4q jaiih* g;5wdl 7the 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 mov ) p2pvcbx z))7sg(safes $3.0\;m$ 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,e*8z tta(wtws:g0yq/ $y\;vs\;t$, 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 tra9s,byz :d*ur yk6;rwpck for total time T in two parts.uyrwsd z ;*rp,:9bk y6
• 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 car onwz 9 xu0,z98dto.l nu.b vu1w(rs*i)cncqzu( a straight track is shown in the diagram. The thick line represents the velocity. Assume that the car starts at orig8c)wczxurz1n.9nzb 9u(lv u,is q* dotu(w.0 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 the motion of a car on a st7 b, tar7e7gel,o)0b/n ssgcu3 onj o(raight track is shown in the diagram. The thick line represents the velocity. Assume that the car startso0sg /7nan tbe3ugj(7,ro7) cebso ,l 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 th/p7 yr5 w+dvtpaf-ie7e position vs. time graph shown. For what time(s) is the speed of the objadwi+ /7p t57yf- vpreect 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 vozoc)rubeh4 h1y5 / s*s. time graph shown. For which time(s) is the accelh* hz )b4s o5er1yo/cueration 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 ;v 7g)xi ir:i(dcz/wc75p-o fwl*jnc area under the acceleration vs. time graph for a fixed time interval of an object’s motion, what quantity has bee(*i gw;c7 :7w5-izdrxfc oivj lcn)p/n determined for that object?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.08: An object moves along a horizontal line with r ;xun5 j12udoincreasing 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 6 f puzq0z ebi*zt295m g) +e/uxsa4nntwo 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 reache9swj9ypd m-x h;9lq 8ls 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 andk//c jw0w qxnx/y4 p,0xr3k my 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 pxw/hej+i;m g ax un6l22zz4.iarticle moving along a horizontal axis is shown. What is the total distance traux.z+nigwz lhj6 m/a2; i2e4 xveled by 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 identifi w0 5pdjp8ur-tqzs,4 les all of the listed situations for whichtuqdw r-l05 zp48spj, 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. timee4-jo+)rdd6 kzy a8o d graph for an object moving along a line is shown. The object starts from dao -z)6ekrj4d d8yo+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 v0i8ps 1 k sk(ekn*wvlza4 q5b1elocity along a line vs. time is graphed.1*4w bvi0k spas( qklk8zn51 e Which one of the following choices best gives the proper interval(s) of time for which the object is moving away from the origin?


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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  15.09: Two cars are moving to the right on a horizontal track, each with constanoeu5880rkb y ot accelera8ko rueb85oy0 tion. 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 hasw+,e))lbl ce n 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 graph, which one of the following choiysmzyp3j6( hs*ra 1-v lqfbjbzf;) tp;r42e,ces correctly describes the relationship between the average speed of the truck to that ofzp j b2b,4lryqja1 -ffsh;6z;pe)(s3m*ty vr 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 desatbjp*6w d 9c1cribes the instants of time, at which the car an1dcbpw9* t6ja d 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 froxwc5 ;uj*4su1cdz rqj7rk + 2; h5xvoim rest at the origin and will move along the x- cj 7zohv s5;2ci*41xk+wjqd xr5;uruaxis. The acceleration 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 horizontal line is s lyo(wqq2w3p 9hown. At what time(s) is the object( y3w9wp2qo lq moving 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 t1j med;/l knl,he position vs. time graph provided. During what time nj1le,d;/lkm interval(s) does the mass have zero acceleration?


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