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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: 游客未登录  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 tbo5yytp,k bcrhn,1* ;; 5mqega-gh 1wravels from one point in space to another. Make a comparison between kq,g-h*boh y mc5ew1bra5;, 1t;n ypgthe 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 equal to the insktbr. ; edm;5dtantaneous 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 go "from zero to:vtg a*1y wrfv3w8riwi0)e,f sixty in 8 s". This is a descriptioe1fwrv)i: ,f ty0 r w8w*vig3an 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 +xm7 8 (l(wvgaxug)v46y2r(u6oq woik o axis experiences an acceleration 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 traveling to the East (+x directe- ux51dhwt9vlneqxo7 93e ((7witxrion) begins to slow down as it approaches a trafficxqit3h 7 1nre9do5 wxl(t9v7w(x-e ue 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 directioen hf,,ldj4p fcc w1/1n) begins to slow down as it approaches a traffic light. Make a statement concernijfe fd,4 nw/11cclph ,ng 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 object is moving with a constant velocity. Make a statement con a3e02kjgm et+rq9c/qcerning its accele+qgkc 2 9 t/a0e3jqmreration.

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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 object is zero, does it mean that the acceleratiozpji4rlj6,w+kg 62 lgn is zero? Support your answer wit4j, pr6ll6zi2g wkg+j h 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 at3rkycz.kfk0jzbc w dnzpz1rs3 -l//8 h5 +:acceleration is constant? Support your answer with an exampk3s /f-z0cc5 /pknk+l 1dy rbwztza 3.j8 r:hzle.

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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 const )e1gyxg. ppy9ant acceleration. Make a statement concerning its motion witgxy.yp9 e1gp) h 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 increasiv1-f*2oflgn9 f4 w a2o ,btigkng speed while its acceleration is decreasing? Support your answer with an exampai-ffwfo gg ,o29k4lv* tn12ble.

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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 initlig aj*6rwtz*0xl72p p 2mk.o3s sjs b(q8i0tial kick, moves up along a smooth hill of ice. Make a stkib2r6zlps8ql20o(sj *. jxw * as7 gt0m3pti atement concerning its 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 equ8 elg pqg, 1/zl wiq9t .aju pryb8rn0h9+p8c*al to the average of the object's initial and final veloci ugl ,8tp9+* r/rpyw ni cabqgzpe98j0.q18lhty?

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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 start at rest. They both accelerate at the sameqvl1) c3a4o /qlr g: ;jx e4hltlz8c-j rate. However, object A accelerates for twice the time as lhj a-lzro3ve 4l xlcjq18:)tgqc4 /;object 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 fromn-fgicgw g)53o(y ez .d n1l(p rest. They both accelerate at the same rate. However, object A accelerai) ( fy n-5 gc(zwnlpoge1g3d.tes for twice the time as object B. What is the distance traveled 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 released from rest and1dwh/g ep+lhw, nq0. j falls in the absence of friction, which of the followqhh0lgwp. d1n,/jew + ing 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 frlv.8rj7i ezfg37th *+ b o;jahom rest and falls in the absence of friction, whichov.3 7 f gj7zeith;+8rl *ahbj of the following is true concerning 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 straight up. Make a (v-,5 rguqosl 2;ddrrvokt6. statement about the velocity and the acceleration when the ball reaches th ,r l6qgot(5ddr;s- v.orukv2e highest 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. Whf*xehiy ;sq52 at is its acceleration just before it reaches its hi;yqxs *52e hifghest point?

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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 fanvy41952k :wa qazzyv ,awi z3lls to its initial height. Make a statement about the direction of ykz,w a:an3qi19 z4wv2zvay 5 the velocity and acceleration as the ball is going 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 height,b fg/e7qb xe( *n4tzr:smn6-pat9j7kx( u(i d then falls to its initial height. Make a statement about the direction of the velocity andz(j(d -4uf* xm6r( e7ngts:pqa9 i bbxn7/ket acceleration as the 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 the absence of air resistance. Maotnl7h m-g h bg-(i87oke a statement concerning its acceleratihm78g-b h7l-(io ontg on.

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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 fqqgyp:o qrgb3 *8z s-2rom a high-flying plane. What is her acceleration when shez :rg2y o p*q3qq8sg-b she 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 withfdkl, jm 5- zeooovu8-l33n5h a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher domonz,8j3h- ku3o5odle fl 5-ves 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 a buillm;k 9ig tfi v:a itr0*i(q;f7ding. One second later, ball B is dropped from the same building. As time progresses, the distance between themka *tff0i9;t l(iv7mir:q ;i g

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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 second later, ballxi0 u,m2jecdv8e)f 2g B is dropped from the same building. As time progresses, the difference i2egvfu )2exm0,ijd 8cn 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 from the top of a tall building. O s d-zp3(un6pxne is thrown up, and the other is thrown down, both with the same initial speed. What arep3xu-( npz sd6 their speeds when they 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 building. A second brick is thrown strai: oz0bv 4lok3x vy:*ryght down from the same building. They are released at the sa o4:yv*vz 3:r0xloyk bme 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 no2jzru12 8/jo6a yuxian-zero velocity in the +x axis. The position versus time6u 2 2/ajzoxaji1uy8r graph of 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 withuu xzk mi)d8+9xn r734otk4lgk ,jmc/xng m:7 constant non-zero acceleration in the +x axis. The position 4m3 kk/u:doz9 x 7k 7g 8n)im+4ncl txug,rjmxversus 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 constant non-zero +pgwtr9fr b4(.t:a wt+ggjy9velocity in the +x axis. The velocity versuwt 9ap(4 tg: .yfwj9+rb+t grgs 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 acceleration in the +x (q52xt;a tqnb2fnz6 gaxis. The velocity versus time graph of this obje5fg6tz;a b2x(tn2nqqct 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 versuo-d4q ruu4 sci) m*rr8*h +m9qvdz4 vis 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 k,h4 v5ukpk2tgv)b8c versus time graph 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:vq b5 we,n+dgylg+g ww1 d,r0 time graph gives

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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 ( ,zgf9+ pjzqaa velocity versus time 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 object is a horizontal line,lr2 83: m/r gwto/yxxn the object wn3 2 xrylg/m:t8 /xrois

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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 a vertical line, the sz*:oiod; s y+object is*+:z;sso doyi

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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 l7zyo5 vi2cr b2ine, the object i7z2iv oc2r 5ybs

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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 a1)kaf n he3eb -alrq 1:9vm 6yuz:(web straight line making an angle of 30 deh1 nvf elb)3:r-wzqb:61 m ae(ku9e aygrees 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 both th d)cwaw4 nqtenlu7,qi a7997we distance traveled and the magnitude of the displaceme,4n)aqt797q wnleu7wc ia9wd nt 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 30 km/h in still watefqlmv no8 jfk8x( ,*2jr. How long will it take to move 12 km upstlj2xnkq, (8*v 8fjof mream in a river flowing 6.0 km/h?

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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? (yud2-mgec)e51 jhtelwm*93 k 1 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 speed in order to travel 350 km in 5.15 f2oeb y o+/q.ih?

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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) in2m6s3l/r b m2 ap3oqvo 2 hours and 57 min. What is the average s6o/3s2rb3qpm 2m avolpeed of the runner in m/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. How long does it take for it to trav 4xi+d 1wxoas 1ur pg+w1za08wel 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 q(m24faz. z m w6tju9bppnp.6in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mi = 1609 m, 1 yr zf6(uqpzjw6 bmm t4p pa.29 .n= 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 yo)ib, ssmhf*z4 u look to the side for 4.0 s, how far do you travel during this inattentiv) iz 4mf*ssbh,e 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 aropcmget4l p9 58 dj)0-s x2pfwwund an outdoor track (400 m), in 100 s, your average velocice5 dwxsw 2 pltgf4m9 -p)0jp8ty 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 south, theq28 kmp+jh9zp n 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bearjhzp2k98m pq+'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 4oo-3ex-2opgb j f n.seast, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 x4p2b oe jofo.ng--s3min. 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 from school at 55 mi/h for 110t4 q6gfd6s)huzn3 6wdt9l n h) miles. It then starts to snow and you slow to 35 m)d6)t6w nh3n6q9fdghut4sl z i/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown 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/h and 160 km at 100 or6 y-qxu5 ilesj:9 1tkm/h. What is the average speed of the moto sj:y9i1uol6 r5 qx-terist 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/-av,)l-r ukh6sxorx h 4o0ws.0 h at 100 km/h. What is her average speed for t)lhvo-hx-korru s/, xw04a 6s he 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 t.v(pi; af y+plhen at 250 mi/h north for 750 miles. What is the average speed f.ilvpp;y a(+f or the trip?

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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 anch 8d1rslu t03nrorman (the 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 10.1 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 thatr3l08n tud1sr 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. The car's averas ge )r9rkkh,+ge velocity during deceleration was 50 km/h. What was the car's deceleration whi,)+ ghk eksrr9le 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 its speed from 100 m/s to 160ep8c*o r:v: x ;3v5udnkp fwd3 m/s, at the average rate of w5dfv:3vrxpp *:8n ; 3cudo ek$15 \; m/s^2$. 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 acceleratez guzcgj) d-b* -orqabguq) gr 99u9/ntj 2m((s at the 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 h2iuj-/7d is6)m)o6y*ddgd1rytj v v and 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 ma h 6 k;min4eud.)shyau5ko7: /s for 10 s. It then speeds up with a constant acceleratiom ue6a: )n.54 7oiaks;hhkuydn 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 velocity of 5.0 m/s experiences l k;9r,p vo-kvhiysm) wl+ /r9a constant acceleration of oikl-9pkmr,y lrv;/h v)9w+s $2.0 \; m/s^2$. 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 s6 djkm :i jji6u* -.etfzr7m;qpeed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 c.7*kmqrfd 66 t- mizjje;u :jim. 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 cr:f:vr- s(3bq(vu,mn *q djikatapult on an 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 constant, what is the length ofnibj(u -:,(r*fdqqm3 v:kr vs 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 rest moves with constant accel ,6bfma00 b-m(sawx1tzeq5bk 0v f7n keration 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 distance of 200 m. What is its averagess.bsri4e 4n,zhn6 q 5 accelerationzs,.4s5nirs 6n4b e qh?

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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 rest and nse* 7olio vk9ews 0f71m38zujix ,g-undergoes uniform acceleration. During the first second it travels 5.0 m. How far will it travel durio jni-x79w08 ks*vzse3umoe 7 l,fg1ing 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 straight line with constantxk.,ns; utt 1g:bu3 cq acceleration. Initially it is traveling at 16 m/s. Three secog,ku: cbnt1st xu;3 .qnds later it is traveling at 10 m/s. 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 andn3b p5hj zb7zb*g*gc/ accelerates uniformly at $3.0 \; m/s^2$. 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 can decelerate; zp :w:w)ejsk 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:pe vbf,h: a/m4hx g44wd0 lxv has been waiting at the intersection starts ahead with a constant acceleration of vmb : 4h4 xeh,/0pldaw:x gv4f$2.00 \; m/s^2$. 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 upw w:bqig/,0n qrard with a speed of 12 m/s on the surface of planet X where the acceleration due to :rb,g/ni qw 0qgravity 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 up4*cuk(zvkgzl n*m)e j.uc sx;ve,q/ 5 ward with a speed of 12 m/s on the surface of planet X where the acceleration;c** msjg z)ne(u vc,/ exz q4vk.uk5l 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 with a speed of 15 m/s on the surface ,q3xatd er(c8 of planet X where the acceler e(d8t,3arx cqation 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 with a speed of 14 m/s on the surface of plr w3 k1 fxbrkc31+m2f0g+pjiuanet X where the acceleration duek+gx3mf13p 0br1firj2wu k+c 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 ys 1u jruz6-mel9 z4ch( hip,u,our friend holds a ruler between your fingers and releases it wit r4c pheu1im zuu,l( z-jsh69,hout warning, how far can you expect 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 *,y1 b h5itpg h3hvjk-is its velocity after 3.0kjyhp*h5 b1hi v,-3t g0 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 up returns to its starting point in 10 s. Wha:cb 26/ca nae9bj .yxct is the initial speed of the bullet?e/6c:9byb .2ncxj a ca

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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 of 36.0 m/s. How long do(mihk lm: 68xkvliw -3es it take to return to its stav xhi3l- 6wmk8k(ilm:rting 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 speedpvyz l 2z:v5d. of 25 m/s. It strikes the ground after 2.0 s. How high l .vd p25yvz:zis 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 straight up with a speed of 30 m/s. (only fill ins ;-jj7*vyqi g numerical value in the blan v7yjqs; -g*ijks)
(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 into the air with a speed of 30.0 m/w(sz(hm( 4tmx s. (only fill in nuwt( 4hmmsxz( (merical value in the blank)
(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 the velocity at t = 1.0-6b iim zdm0a,jyja2 8xpl1n/-2fioa 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 the velocity at t 9daz yepl5*;3;cgkms = 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 velocity at t =tkcw1 g(3 hcx gisx17dv2k2s8 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 the velo /t7,af gkyw(tu,0xfc city 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 0mcvte b d/ 5oo n2/es/ewo; +ukoc0j8/ to 4.0 s?


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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 average velocity from 0 fzgx5*nvvv2 .pjt 6ck1 3k dfhb l5.2mto 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 accelerati. e*x.req6p3 pv(mreton 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 thefi(0hdpb w +*s1bf9w j acceleration at 3.0 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 ls td-8;j x/mpacceleration from 0 to 5.0 s?


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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 acceleratr 8qzx1gxjr )z(70rp mion from 0 to 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 tbe /7jg*qnp/ oo0 v3hshe displacement from 0 to 8.0 s?


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