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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 circularmsda,w/ p-6 wh 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 timeg -sov)/ptoa-npv c.:9b5m 7 ozt7:lwi d7ccp without reference to a particular dipv5/lav7pt-gc .boi7stcz ): co9:om-n7wdprection 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 on,ug n 5hdabmnwi0ce337 zf 4/ne lap around a circular track at an average speed of 50 m/s and then completes a se3b gnd7ah 35eu40,c/m wnnifzcond 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;u)ha;3lqd8jz3biv( 3ty qcc continues, how far will it travel in 3.0jy(lqv di; cu33cq hba8)3tz; s?

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  05.34: A 40-kg boy is stationary on a 30-kg plank fk bp 5 (qh,(h:ksopj4that is sliding at 5.00 m/s to the right across a frictionless pond. The boy then turns and starts walking on the pk h54ho(, j( pfks:qbplank 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 100 km/h. W6jrw+gu hp5v* 3faw 1nhat is the avnwwuf+pr6gv h315a* jerage 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 alongbs/ell)p; 9fait(i 3vcfr z,. the x-axis. The graph shown below is a plot of the car’s velocity in the x direct;i zelpi.rtb3f9 va( /sf),lcion, $v_x$ 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 tolya2f*8 i+wwiitb k9v h(ct4 cqv 47+sy car traveling along the x-axis. The graph shown below is a plot of the car’slvi+4 ktwf 8hvy42qwi9+* 7ibca( tcs 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 ts(3p1ym4t mt ihe x-axis. The graph shown below is a plot 4st(p1yt i 3mmof the car’s velocity in the x direction, $v_x$ versus time $t$.
How far did the car travel during the first 15 seconds?


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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  99.15: Given the graph of the velocitx yjj 16s,uo-;e,8fpk p3c4 avk o,jefy vs. time of a duck flying due south for the winter. At what point did the duck stop its ,oksej6,k -vjpja;e3f, of1c py8u4x 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 thef./r 7pa6c(ppp 6ixwu diagram below which shows the position and elapsed time o.ipra7 p wp/f6(x cpu6f 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 diagrazq2 al)k+ep e4ctc4l4 m below which shows the position and elapsed time of a car starting from rest and uniformly accelerating in a straight line. The average acceleration duringc4ltp e l 4azqc2ek)+4 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 yh5gg kuy:p+x5.o a-efor an object with the position time graph shown in the diagram a 5-g.xh o5ygue k+y:pat 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 eomc3;p8qeb+ dlastic rubber ball is dropped from a height of about 2 m;deb8cm+3pq oeters, 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 fol6 ufg y10j6auhnd,my rjr( ybt,0+2y w0-pjmz lowing information. An ideal elastic rubber ball is dropped from a height of about 2 meters, hits the floor and +rr6y,g6jn yzm00mph yufbw 2j a0t-y1jd u,( 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 tra gy+0mu,*rbb 0ck ijutu38c1g vel 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 refers to the following scena nsv682wg oe(e-7 lhcurio: 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 follo-qrl2.wj)b8zasee(d1 9jvv8 x4 zlxq wing 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 o2ub/d/9v n a 4k /c+vrxo ;-0ylbcghz$t_0$, 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*z lirs)*wp4 y 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 horizontal tabkyn ra,q )b7u;le top and off the table edge. Which of the following would best represent rqak)u by, 7n;a graph of the magnitude of the ball's acceleration vs time?


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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.01: The graph represents the relationship between distance and ti9cvnoz+rz 9 .bkprvr ul-;dmwv5* -r;me for an object that is moving along a straight line. What is the instantaneous speed of th9zkluvo;w.nzrmcr- +;v- b9rp5v r d* e 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 relatioi)wjxli 1svva q;1q 8e*m(0f pnship between distance and time for an object that is moving along a straight line. Between what tip 1s;0(lq1m wa*fvqxi) ev j8imes 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 th(l bm17-ad6.gy8 isb/nsqoyq rown straight downward on Earth with an initial speed of 12.0 qio7q. y bam/snlgyd6s 8(b- 1m/s from a position 10.0 m above the ground. Ignoring air resistance, the speed of the object when it reaches the ground is

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  02.11: The diagram below represents a toy car starting from un4josd)r9(h o)gz m2rest and uniformly accelerating across the floor. The time and distance traveled from the) zu2 4hsmnrg9( jdo)o 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 represe68xc5o+ee 6j2vpmd) dam*rn k nts a toy car starting from rest and uniformly accelerating across the floor. The time and distance trave+mxko*2n ja6edcd m p)e58v6r led 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 toy car starting from rest and uniformly av5eq4c/.vze + z p9acsccelerating across the flq/vv azecc5 .espz 49+oor. 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 s;g* b(wd r h,txc 8blcv)x2adqov:*4 whows a uniformly accelerating ball. The position of the ball each second (8v4d2tolw c,d);a *qxg r wh:bx* cvbis 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 sho xwx)t (d +gz/xg*q*t)v)fzmows a uniformly accelerating ball. The position of the ball e (xg)v*)zt)q/x+ztw*f gdomxach 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 o f /aekk;8(chc zro026g4nxjln a unicycle moving in a straight line is shown in 8kc enfjz0 2 x;o6/lkr4ghac(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 sdfu8k,4, y 5zf2u+d 6zv gyjoqtraight line is shown in the graph belf5,v zjug k+f64du2yozd8, qyow.
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 surface of the earth,/e0oydauub8 oets ut pr09*(

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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 tabl inpw3e zaf01rw31gl-e top for 10 seconds. For which tim3e310 r1alwiw znpgf-e 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 motion of a mam1q:3vxu /p) pdng4as rble on a table top for 10 seconds.np sad3) 1x4 qgvup/m: 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 accompany-xq x :cwrv;*cing graph describes the motion of a marble on a table top for 10 seconds. What is the marbles average acceleration between t = 3.3 s and t = 3.8 s* wc:vxr; cxq-


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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 fromv.oks+yl/n 0 b 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 straih6h2jk8*a-h:o /tjrggsr+ ss ght 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 following graphs could correctl7)7 ; ,r5fsbhinmlizuy represent the motion of an object moving with a constant speed in a s s7ibzu ,rhn7lf 5im);traight 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 descrrl uruw3w/n pqz jj6+id6(t ;eo//( gpibes the motion of a toy car across the floor for 10 seconds. What o(6uzg r3 n/( /;ljeqp wu6wt+rdj/ipis 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 (qn0 hhox59t hdescribes the motion of a toy car across the floor for 10 seconds. What was the total displacement of the toy car for the entire 10 second int(xnq59 h 0hhoterval 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 deu* ip v6jre+7b3a / dqs-,mkqescribes the motion of a toy car across the floor for 10 seconds. At wha ,pv/6sq*iudjmeb r-a3k7qe+t times or time intervals must the net force on the toy car be zero?


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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  16.03: A car accelerates uniformly from 0 km/hr to 60 km/ 2g2kry;ap8)ocz6qi ohr in 4.50 s. Which one o )2ya o2pk;ozgcrq8 i6f the following choices best represents the acceleration of the car?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  06.07: A car has the velocity versus time curve shown.r tbbn7 ja/*b-sy*0nwuo0 8 gs Which of the following statements regardnwb0s* 70s jbyg/n-o* urbt 8aing 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-axisr j7jn- 9nn. hhp*7a te)ls.fs according to the velocity versus time curve shown to the right. When does the car ha* .nfa s9htp.jeln)h -7nj7srve 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 tk-nu/,fm qd z/ennis ball is moved so that the angle between the velocity and thm /knqf- uz,d/e acceleration 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 rxlru*yt .kdj9m tdm4i(*+.d are 150 kilometers apart and traveling toward each other.mr9*t*yr l.mjikdu+d 4 .td x(
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-a vp :tlui((14 noe7kabxis. When the acceleration is positive and incoa(vn4pi( t1 klu7b :ereasing

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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 :;ai ssu5up n9is

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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, w4wk(t q- 1grb p57yvu9+ssvnkdd+gt9 hich one of the following choices identifies quantities thatgtv+y9k bn kg54pdqrv-9 us tw(s7 d1+ 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 movesw uwx 05-ao9ywevex48 $3.0\;m$ 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-t a:7xvxbe -2cyime, $y\;vs\;t$, 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 t-3v5 vvqf)p hc xgrpj;)4d s0votal time T in two part;r3)dpcpgqvv h0 -)fxjv45vss.
• 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 focto d. niv /kjez mj-9d8,o6)ir 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 at6 i ne8o ij ./d-to9d,v)jckmz 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 graph for the motion m7-ttliw.s4:dwd2rll pei 4/of a car on a straight track is shown in the diagram. The thick line represents the velocity. Asd4te-id m:li. tp/r7wwl2 s4lsume that the car starts at origin $x=0$. What is the average speed of the car for the 10 second interval?


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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  09.08: Consider the motion of an object given by the position vs. time wec e.x ch3f;rku bn s+ww-py9)d/,-bgraph shown. For what time(s) is b;, kb pd-ny+r3cfsxw) we.9c- wuh/e 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 ;ouc xc.a,v;xof an object given by the velocity vs. time graph shown. For which time(s) is ,uac;ov;x xc.the acceleration of the object equal to 0?


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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  10.24: By computing the area under the acceleration vvjc(m/coqbz4 5;3qck s. time graph for a fixed time interval of an object’s motion, what quantity has been determined for that oqvzmc4 c(/ 3k5oq;j cbbject?

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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 moveo+*gfdk: hwx 7s along a horizontal line with increasing speed.
choices could represent the signs of the velocity and of the acceleration for the object to achieve this motion?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  11.14: A car makes a tr h7pp2rn: k) kg2 95uupgy8pncip 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 releasw/)pp8-j pt eqed from 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 ground in a time of- jt55jqx rtnwxr:;2g4 m gmnm5dz 39u $2.50\;s$. Neglect air resistance. From what height above the ground was the object released?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  13.17: A position vs. time graph of a particle moving along a horizontal ax :f vq:weiqkc5 3:(rkofk(/zf is is shown. What is the total distance trak fo5zicqk3k(:vf:eqrf /w :(veled 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 qwc2yrz1 rl:t-j8 zvm kv* 2z4identifies all of the listed situations for which there is a non-ze4 zzc1vzw8m-rlrtjqv*k y:22 ro 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 foavuav0 w0r/ quho4 i35r an object moving along a line is shown. The object starts from rest at time t=0 s. At what time(s) does the object attain a maximum displacement from its starting posiua530/vhar i4 o0 wqvution?


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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 alocs :vq-mkws b9p:5h5vng a line vs. time is graphed. Which one of the following choices best gives the proper interval(s) of time for whcps55v:v9kb- qshwm:ich 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 to9 9rj hs30bh cpo,/ulw the right on a horizontal track, each with constant acceleration. At an instant of time, the information about the cars is showhbr /jwl0po9hc9,s u3n:
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 av* * mew1wq2ck 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, whj 6lk: h(flb ckvo::z w+u/0lpich one of the following choices correctly describes the relatioo: :zlwu:l +j(p/bk 0vlkf6c hnship between the average 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 gc4 akb i94n6 oef1rm,best describes the instants of time, at which the car and truck travel witeb mcrn4 g9ki6o1a,f4h 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 move along /,5ru)jpqe f)l a5 +veopy9z gthe x-axis. The + 5)uyaepjfz 9/lv5 eqrp,)ogacceleration 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 xl3ij qq0,)jv:tj)f/3x; mtbqvcw a 4graph of an object moving on a horizontal line is shown. At 3jtiqqjx/tx, ) bjlfw0m 4q) 3avv; c:what time(s) is the object 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 the position vs. t/:fxdjxd v+7/l1m ah uime graph provided. During what time /j d71mu:xf xlhd+v /ainterval(s) does the mass have zero acceleration?


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