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习题练习:Physics Unit2: Kinematics One Dimensional Motion



 作者: physics   总分: 98分  得分: _____________

答题人: 匿名未登录  开始时间: 22年07月19日 23:10  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  
  Suppose that an object travels from one point in space to another. Mak5utfnx *)nl; 0n0- wc d)3;dy qbpeg8/cytmc he a comparison between the d cfex30;hbpc)y;mu5t 8wyqnn-)*g c0lnd /t displacement and the distance traveled.

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2#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When is the average velocity of an object equvxn ;;ia.t4v wal to the instantaneous velocity?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A new car manufacturer advertises that their car can ezyu)8cpv 94om3 ga z:go "from zero to sixty in 8 39a:o4vc ypgu )ze8zms". This is a description of

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moving in the +x axis experiences an acce2 yh7v(/y ,w6mcesv klleration of $2.0 \; m/s^2$. This means the object is

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5#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car travegr u6npv62 c,cling to the East (+x direction) begins to slow down as it approaches a trafg6rnvu2cp, 6 cfic light. Make a statement concerning its acceleration.

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the West (-x direction) begins to slfkgejf4b-+ ziq)xy 10ow down as it approaches a traffic lightbfg+k i4 j yzfq-0)xe1. Make a statement concerning its acceleration.

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an objec aeo0;sum9fxzcf 7s 4/t is moving with a constant velocity. Make a statement concerning it ux0mzosf e9 s;7fc/4as acceleration.

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8#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity of an objec ik3ik1xb8xpx/f+ mr,t is zero, does it mean that the acceleration is zero? Support your answp +bm3 k,/xki xx18rfier with an example.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object's velocity change direction when its acceleraetpv w2.,xrq- tion is constant? Support yo p w2rtx,qe-.vur answer with an example.

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10#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with constant acceleration. Make a s fkv6 bzvn:m pa-n2-tcy9:k8zjy/g.htatement concerninv6-gbyz.a 8 :/2zpf-c 9kky:tnmjhnv g its motion with respect to time.

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object have increasing speed while its acceleration is dlnih2wik5a 5m -ilq4 5ecreasing? Support your answer with an n iiw5q-52m5hk4ali l example.

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a can, after an initial kick, moves up along a sj fgj /cp3qx4 o3s2h4emooth hill of ice. Make a statement concerning it4hjgx/es23p c 4jof3 qs acceleration.

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Under what condition is average velocity equal to the aver f3l9u nnmi*s ;t2r.eccc ;z.tage of the object's initial and fulc;m3 f9z * 2.inectt s.nc;rinal velocity?

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both star agorb1*7 ht7yt at rest. They both accelerate at the same rate. However, object A accelerates for twice the time as objec7yo1hb*tgr7 a t B. What is the final speed of object A compared to that of object B?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both start from )b:nv ix dl,q4bx+s)yrest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance trav x qds)iv)x4bb+yn, :leled by object A compared to that of object B?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is re0 .gg2/ xi)x ifaqm7adleased from rest and falls in the absence of friction, which of the followinggx .gi7ma2qf dia0 )/x is true concerning its motion?

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17#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is released from rest and falls in the absence of friction, whichh,vjui 0/e3y v4zbs)v of the following is true coy ,b vvz vs4uhei30/j)ncerning its motion?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown strai yqf1/,3u:qlat (wv xep alji8(h(qj4, oka n/ght up. Make a statement about the velocity and the acceleration when the ball reaches the higa/vk ((,fajo q(4,tlp/8e1n hyuqixaqw3: jlhest point.

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19#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. What is its accelera :.q) dh,jseqzyay)*. 8,p7s;dy xzl .wk psuntion just before it reaches its highest pou,d seslsq)p yyy*a ).njk;7x. q,zwp d8. :hzint?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up, reaches a maximum height, then fb45s afy- a;4ur *b)+gx)uhgqx/r tk ealls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is going btk) gru5 rfga-/hsaxuyb +*xqe4)4; up.

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up, reaches a maximum h3qf/-:ki/ z 8dd ejwgpeight, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as 3 g-/ :jkd/feqz pidw8the ball is coming down.

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22#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown downward in thex3e26vufvxjv* p.l6b absence of air resistance. Make a statement concerning ix6*be.p j 62xvf3 uvvlts acceleration.

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23#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a skydiver jumps from a high-flying plane. What rf( 3)c5 l ,kvycze*a) ey*iek8cl0peis her acceleration when she she )l relc v 5cfe)kzei 8e**3ykc0ayp,( reaches terminal velocity?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown vertically upward with a speed v. An iq0pmfztpy1;.enwdg 48j 11 cz u(mh;tdentical second ball is thrown upward with a speed 2v (twice as fast). g yu1;m 18c4 q( z1 pjhptmf;w0zdetn.What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of 4wn qobgod.r 4q*z ,i4.2airqa building. One second later, ball B is dropped from the sqwz*g.a r rd4,o .iq2q4nob4iame building. As time progresses, the distance between them

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of a building. One sec (-i9)e cbqmgdond later, ball B is dropped from the same eg)db m-c(q i9building. As time progresses, the difference in their speeds

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects are thrown frsrt d-yx3ydd*ejnt56d6hv6d*n,2 jg om the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when thy62n5vts, dxe d6* 6*- trddd3yngh jjey hit the street?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is dropped from the top of a buokksy (3-h /iayu,1gkilding. A second brick is thrown straight down from the same building. They are released at the samy 1yskkkigauh/,o( -3 e time. Neglect air resistance. Compare the accelerations of the two bricks.

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zerojv9 ru3s-0n ii0l d3ti velocity in the +x axis. The position versus time graph ut03d ji-09n3riv lsiof this object is

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30#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero acceleration in the +x axis. The 0ax7gdmp ;-fzpositix7pzd0g amf-;on versus time graph of this object is

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with const v8juq3 pq3qc)of 95vszjr: 4aant non-zero velocity in the +x axis. The velocityfqa up vrc59v4z qj3):jq38os versus time graph of this object is

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32#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero acce zg.z+/jj)ntxs.a/ 8uwrvx/t leration in the +x axis. The velo sz +/ x/jntx.8j r/.vztw)gaucity versus time graph of this object is

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33#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a position v:ildpqu f:(znndnt74kr) 9su5 5h+d yersus time graph gives

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34#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The slope of a velocity versus time gr e s ,qizqcuqbmd6m 42:cs7f.,aph gives

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve in an acceleration versus time graph gives4qeg), n-pd o zv36wlg .-mquj

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36#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve in a velocity versus ouq eg) 2f+**pc- byxsd+n x+rlw,/w ztime graph gives

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of an objp6z17f.xdi 6xaa)2 g( p,4ttf l4eft -wahtcwect is a horizontal line, the object iia6fa- fetwc .w gdztt1 a2(,l pxt47)p4 fx6hs

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is arfz(ra8) w mf9 vertical line, the object ism( wf8f zrr)a9

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus time graph of an object is a horizontal livvhl2n.;vlz g ah+/o 0ne, the object is2ov;/hl0 nv+gzv a.lh

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus time graph of an object is a straight line mge+6pqmoz dd)(lj:6t 9 4uh,s g(lbo xaking an angle of 30 degrglsbdoz(9u,gqlp 6 6: 4o(xm)jeh+dt ees with the time axis, the object is

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moves 15.0 m north and then 11.0 m south. Find bom-exqc45,u 5 +ymo; xknif 6ujth the distance traveled and the magnitude of the displace+fy45jc mex;uko6,5unx m-iq ment vector.

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boat can move at 3 -pum/.p )g ulna2 n0eciwa.*x0 km/h in still water. How long will it take to move 12 km upstream in a river flowing 6.0 km/hu*2 )pnu/cn aagxw-0mp..li e?

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43#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  55 mi/h is how many m/s? (1 bh4y9+)wqsg,b5wk(* ht1 gdranc t4;xeh1ty mi = 1609 m)

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44#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  What must be your average rzp8kvi *t uti3y*b80speed in order to travel 350 km in 5.15 h?

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45#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A runner ran the marathon (approximately 42.0 km) 5mr0;4 urqsdh in 2 hours and 57 min. What is the average speed of the runner in hrs4; urd0qm 5m/s?

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46#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels 90 km/h. 3ojqx qsqaj yq,6x /5hrgq7.+How long does it take for it to travel 400 km?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ly (light year) is the distance that light travels in one year. T8sqz 9.ub,hj .2tot fgwur dkm 1-wt)6he speed of light is 3.00 x 108 m/s. How many miles are the udqksgz8u 2o-9t.) b1w 6mj,wrt t.hfre in a ly? (1 mi = 1609 m, 1 yr = 365 d.)

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you are driving 72 km/h along a straight road and you look to thzo0fm2t;q.by 5i0 4jm wkqjv)e side for 4.0 s, 5 .v j)0;2z40b mywjqftikoqm how far do you travel during this inattentive period?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you run a complete loop around an outdoor tr0yiuhj x50+el j4bbxm /+ *khpack (400 m), in 100 s, your average vellp/m+0h+j0kbyx 4ib*hu exj 5 ocity is

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels 1.0 km so6 fzl1d 9ghnv3s8f43cn kk5lputh, then 1.0 km east, then 1.0 km north, then 1.0 km west tonkflzd4819 np h 3k3gl6c5 svf return to its starting point. This trip takes 45 min. What was the bear's average speed?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels 1.0 km south, then 1.0 km eas3 zt2.jb-j,hp3 tis 1yi6x0gz6yyjfe t, then 1.0 km north, then 1.0 km west to return to its starting point. This tripp 0 xs.3y 1jigtyhyje,fz t3bji-66z2 takes 45 min. What was the bear's average velocity?

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52#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  You are driving home on a weekend frm+qt;,l8y 0pau .juxxom school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometownujxt;l0+a 8 .mpqy,xu from school?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels 160 km at 80 km/hcjbq - csab(c-0rarq)n zh8s44:qbm :q 66b fn and 160 km at 100 km/h. What is the average ( bbb8q6c6 0cs:rnabmfqs-a)z4 q: -4qcj n hrspeed of the motorist for this trip?

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54#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 kdom((wd ug 2-z l3-umcm/h. What is her average speed w(2d3mc uz-u o(-mgdlfor the trip?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane travels at 300 mi/h south for 2.00 h and ug5ii fj/sek3bdo- 2v2m*2bm then at 250 mi/h north for 750 miles. What is the average speed for the tr/um-*bke3f 2 5 gi2dsm2oijvbip?

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56#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In a 400-m relay race the anchorman (ts8ok 4do 5b.lax8h,t rp7js)ox 3 vap3he person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10. 4 xdra.3lx8jp s3pt8oo5 h,vos)kb7a 1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order that the team A runner not lose the race?

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57#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car decelerates uniformly and comes to a stop after 10 s. Theadl5.ym x g0rr 11sivj/x +o8s car's average velocity during deceleration was 50 km/h. What was the car's deceleration while/10dr5.rs yxijxs om1 +8gla v slowing down?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane increases 2-jlhkpqd+9w its speed from 100 m/s to 160 m/s, at the average rate of d w+p2h9lq-jk$15 \; m/s^2$. How much time does it take for the complete increase in speed?

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59#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car traveling 60 km/h accelerates at the fqv/3l2 )fcf2l7gtmn rate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart starts from rest ac6t5r lob05r- i7snhd nd accelerates at $4.0 \; m/s^2$ for 5.0 s, then maintain that velocity for 10 s, and then decelerates at the rate of $2.0 \; m/s^2$ for 4.0 s. What is the final speed of the car?

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61#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car travels at 15 m/s for 10 s. It then speeds up with a constantv 2dz0c)h udsr sd9).t acceleration 9csru.)0zdh 2)v tsdd of $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart with an initial ve b23lb58w;sy+r48pd ucrzletlocity of 5.0 m/s experiences a constant acceleration of erb 4d l5zsr8 3bl;cp28wy +tu$2.0 \; m/s^2$. What is the cart's displacement during the first 6.0 s of its motion?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet moving horizontally to the right (+x direction) with a s-f mi4tkbu.5cuc2 fs;k( gh9ipeed of 500 m/s strikes a sandbag and penetrates a distance bt-5cg m9sc4i khffu(.uk;2 iof 10.0 cm. What is the average acceleration, in $m/s^2$, of the bullet?

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64#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A jet fighter plane is launched from a catapult on anr ji467+aiwgn d 4diz6 aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is consid+646ia g4 nrdwjzi7tant, what is the length of the catapult?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starting from sw0(4nl4gprz rest moves with constant acceleration of $2.0 \; m/s^2$ for 10 s, then travels with constant speed for another 10 s, and then finally slows to a stop with constant acceleration of
-$2.0 \; m/s^2$. How far does it travel?

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66#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car goes from 40 m/s to 80 m/s in a 6-; -ar9,y-)pwcvmiczc yqt mdistance of 200 m. What is its average accel crq;-v6 ,p9i-ct-a )wyzm cymeration?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object starts from rvxk)xt7f+ 6oqhqtr+m ;jfr(,un:a ,qest and undergoes uniform acceleration. During the first second it travels 5.0 m. How q)tqron , +,;axjk+v (xthuf67fq:m rfar will it travel during the third second?

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68#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving in a s+io8vi: jloq 9traight line with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s.oi:9viq lj o+8 How far does it move during this time?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starts from rest and accelerates uniformly apc7muu;zig+5caq 3(3s) kqh b t(bqs9t $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?

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70#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A car with good tires on a dry road la1:c .qjnx+l can decelerate at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?
(b.) What is the stopping distance?
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71#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
At the instant a traffic light turns green, a car that has been wait:k3 oip 8han 0jsos(2jing at the int8(203 ahosjikjpo: snersection starts ahead with a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.
(c.) Determine the speed of the car when it passes the truck.
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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed ow ):(xf+guv2( nt+cr y/hu*hk;ry lmof 12 m/s on the surface of planet X where the acceleration:y ruckh)r*(g l+onfh+(xtv;y 2wmu/ due to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12ctu )w+)c 5 to8+fovys m/s on the surface of planet X where the acccsufc)8t)w ot++o 5vy eleration due to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

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74#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward wi8 13yaq6s pdlb20ttgrth a speed of 15 m/s on the surface of planet X where the accelerqg brtdpa86 ty 0123slation due to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward w )bzv n7jxb y.3ww wj*bz5j ds/ov.;z*ith a speed of 14 m/s on the surface of planet X where the acceleratiojv d37)wjyw *zxbs/.v.wnzb j* 5zob;n due to gravity is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Human reaction time is usually greater than 0.10 s. If your friend m70lepta*14uyp +cwd holds a ruler between your fingers and releases it without warning, how far can you expec0 cl*padw ty7m+1peu4 t the ruler to fall before you catch it?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown upward at a velocity of 19.6 m/s. What is its velocitygp t okt -;rz/9ns1oa3 after 3.00 p3o9t n-1rzkt/g; soa s?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet shot straight 9 yaan fy6h,d+up returns to its starting point in 10 s. What is the initial speed of the bulle6 adahyf ,+yn9t?

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79#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed o b;ou/r ;-gj re,)xkhnf 36.0 m/s. How long does it take to return to its gxr onh/e-b j;rku);, starting point?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown downward from the top of a building with an initial speed ofl 0h7tu2o83iuc y sv4w 25 m/s. It osyuc3l2h 8w40uv it7 strikes the ground after 2.0 s. How high is the building?

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81#
 
填空题 ( 3.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown str 2l 9oqmkhl,szt4y7.+jt) huvaight up with a speed of 30 m/s. (only fill in numerical val.k jtt47lz)uhh2 qvsm ,9+lyo ue in the blanks)
(a.) How long does it take the ball to reach the maximum height?    $s$
(b.) What is the maximum height reached by the ball?    $m$
(c.) What is its speed after 4.2 s?    $m/s$

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82#
 
填空题 ( 4.0 分) 切至整卷模式 搜藏此题  
  A foul ball is hit straight up intu erxz3v , kwoob8129ho the air with a speed of 30.0 m/s. (only fill in numerical value in the bla 2138woz,vbkr u e9hxonk)
(a.) Calculate the time required for the ball to rise to its maximum height.    $s$
(b.) Calculate the maximum height reached by the ball.    $m$
(c.) Determine the time at which the ball pass a point 25.0 m above the point of contact between the bat and ball for the first time.    $s$
(d.) Determine the time at which the ball pass a point 25.0 m above the point of contact a second time.    $s$

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is t:fs+ reuxw.8 9 aqv*a-n1psoghe velocity at t = 1.0 s?


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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is td6 pgn: -mxigz2n2 fz4he velocity at t = 2.5 s?


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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velocit*t(x ,o : vu-fbsld. 7/aopfynk4z5vay at t = 4.0 s?


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86#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is tk/ 2jh55 /f(bbsbqml the velocity at t = 5.5 s?


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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the average velocity from 0 to 4.0 s?q(xfqo gjv71k(s(.p8y k q)xw


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88#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the ave 4ivis73dyv(j gbgs+w4bz xh.mpa4(;rage velocity from 0 to 6.0 s?


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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the accegguv +y obf jay:;,:0jleration at 1.0 s?


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90#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the acceleration at 3.0 smo,* joal9sp;+brl +s ?


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91#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the average acceleration from 0 to 5.0 s?n)3g-+ :pzb vga:n:izzwji:b


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92#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the average acceleration from 0 tox6akthde hh 59 149lio 8.0 s?


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93#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is tlw) wku;0ls; uhe displacement from 0 to 8.0 s?


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