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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 travels from one point in space to a, t6 lz+ktoxu:nother. Make a comparison between the displacement and the distance6 ,l+tuzto:x k 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 instantaneous vel 4gcqp4ne 7b-zocity?

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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 t9gz+bv gb ::ikhat their car can go "from zero to sixty in 8 s". Thisgb+ g:k9zi: vb 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 p :r vbq)9kn8aaxis 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 di *8)/rve:mbd utu r(ggf0k0q frection) begins to slow down as it approaches a traffic lferqm buv*d)t(0 8/uf gr0:gkight. 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) begig blkxvk 5 / fr:g4yk4rq2f),hns to slow down as it approaches a traffic light. Make a statement concerning it :5bg4 lg)ykxh /frvrk4q,f2ks 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. Makmnz .vv/fb h5 q)+;bv/tmk: mte a statement concerning its acceleration.:vq /fm+. k5n/mvt;zmvt)h bb

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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 .c ,2zm enmzn5t9.0e2k/(oxyjjh pj f zero, does it mean that the acceleration is zero? S02j(z,/n ecfm e9xhj on2zj5 . pmtky.upport your answer 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 accelh 0uyyqm 447+ib3 h7irl;vzerwm( p1jeration is constant? Support your an q4y hri40y 7m ub17le3z(rhiwmjv;p+swer 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 statemeno5okv te: ox c,; ;4dyyxw8k;ft cokfvyk; 85o:;xd4wc,xye ;oot ncerning 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 incvc9s b+k)svtpn (/ 7rcreasing speed while its acceleration is decreasing? Support your answer wcpr 7s)bv nt(+9sv/k cith an 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 smooth 65zryamz6l4a -0 f+buwg/ mfkhill of ice. Make a statement concerning its m a0w/ybfgl4+afz566z rkum -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 equu g*9j8 crsk*lal to the average of the object's initial and final velocityl8 g u9kjscr**?

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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 thez it:j; )bhudf(a1w-i same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of objec:(u;-hibwzi j df)1tat 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 rest.ic4rag:em3x n k4(1/n(vlo*3 xuie ll They both accelerate at the same rate. However, objivalx3/me1 3 nxlr lo u44k:g c((i*enect A accelerates 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 and falls in the absence of friction, whim6qge -hks-o6 ch of the following is true 6m shqg-koe6- 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 v5 m2u qf-(lbxe tq56zfrom rest and falls in the absence of friction, which of the following is true cozelu5q(qv 6m5 xbt- f2ncerning 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 statexgkg(8 *vyd+ 6vak2fu *tninjnd . m9:ment about the velocity and the a m .v6g a2n :8i+(njd9 dk**ytuknxgvfcceleration when the ball reaches the 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. What is its acceleratc*--hmwq y 2xxion just before it reaches its high--hq*y2w x mxcest 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 throp: bqz t(1e:jv2qo9 zqkaed+:xt y ;0vwn straight up, reaches a maximum height, then falls to its initial height. Make a stat t:b;9zjex(pqvezdvo: qtaky2+1: 0qement about the direction of 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, then falls to its initia*/k+pvibtrgr19 ph e.u34kvh l height. Make a statement about the directi*p h ptu.9kgri vr1k+v3he /4bon of the velocity and 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 th8k d4donecem. *+hx7s e absence of air resistance. Make a statement concem84o h. xe*sen7ddkc +rning its 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 +;s rhbs tm75n7ifw6d4*;nzmlp*g b jplane. What is her acceleration when she she reaches terminal velocit;ls g*4d z; ipsbbnhm*j76 w tn5fmr7+y?

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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 rsz)z.j 3 5txbsmp c2n+:+crk q+ )gayidentical 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 firk yz)jgna2 :+3.cb zpq+s5m tcr)x+srst 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 a building. One second later, ball B ijly +c*) hf*qjs dropped from the same building. As time py* qljch*) f+jrogresses, 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 tohoii7yv,z8p+ a2 tpukb- b+* vp of a building. One second later, ball B is dropped from y2ipt7vibh +o 8p+ a,-ukvbz*the same building. 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 from the top oiy, gvogrc6d,o/c 1n *f a tall building. One is thrown up, and the other is thrown down, both with the scr1on ,igd oy6,/vc* game initial speed. What are 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 bric;n*uya qap+ck26iqgprus 9 ;2k is thrown straight down from the sa; ukriq*69qp2sa2a;ygup+ n cme building. They are released at the same 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-zero velocity in the +x axis. The pm v0wypx8/l-k fpg+y( osition versus tim f 08v/+ kg(p-plmywyxe 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 with constant non-zero 7mbx k5z; ib oa2k nvp.3ybvlu/g;2:eacceleration in the +x axis. The posik va7o/bxky mz.el2p5:2 bgnb;3 uvi;tion 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 constant non-zero velocity xl6t 3oa45,c p pmoj3oin the +x axis. The velocity versus time graph of thi,6 3c j maot5o3pxp4ols 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(a1c c abxm,oeu4lk, 3 axis. The velocity versus time graph of tlm e ,cc kb1xu3a4,oa(his 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 vs, 8c ;fe8f5x0b :dksxr az7pzersus 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 velocityvuhwg( 5)z+ur 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 ,9q.pm w/ shsonfsb36time 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 a vel*p hv .h +b svhjjm)q89 v3- /e9f8pmveixje.bocity 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 lineh lnw6j s+2+x4vmb7g* soqhcx7)e y3 u, the object isyqn*)w3b 4hl67xh o2 + xc7mu+ jsevgs

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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, t(+v/4oem/it9qdvfynw037 a 5l twez hhe object is3h 9wvevd/(tl e+wfmo540a/tq zni7y

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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 ih8 d-v aggdn7dw)z6 .vs a horizontal line, the object dgg7nv .hzd wd-a)v86is

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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 making an acqmgtni x7wz p7j;c2 z- v1mfbkc9)98ngle of 30 degreesk7 99n2 )mcxmfgtpv8izjc- wc1 7bqz; 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 1 d/girljw o58/euv:mz - a+a/h1.0 m south. Find both the distance traveled u ed+w /ar8hajzomv5:g/il/- and the magnitude of the displacement 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 k .w:+:ji3ey xsm ca1w w(3f2o- zdxhxbm/h in still water. How long will it take to move 12 km upstream in a river flowing 6.0 km/h?m( sedoxa3w2xwz3w:c1hyxif:b-. +j

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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 mi woj5 o3; l hkbylu.g)a+c:-zz= 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 j64to6:sicbnt egcsga 0l939 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) in 2 hours and 57 min. What1 ygn .6 ;qqla,xtj)xe is the averag 6 q1qe)ag.;,xxj ntlye speed 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 travel 400zh:3jw p eq3,c 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. Theeo )zqfcy/1.4.cixsz speed of light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mi.qzsc )oz4i.xyc /1ef = 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 jyi0 ;ayibh1. you look to the side for 4.0 s, how far do you travel during this inattentive periodabji0y;yhi1 .?

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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 tracd.vz a)w .8qk 0ov6kec1v,oaz ll98owk (400 m), in 100 s, your average veloc8acv lzwe1vwlo q , 0kdo6z)v. o89ak.ity 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 1.9x-rzjn.o 7u1btmc5gx r m7;l 0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return mxnr. clj z-g5b9m1x7 otr;7uto 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 travelsn4i*jaf qchjx/0pl8lcr 7.o 7 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to returfllr8jo a4/ h* c7.p70 qncixjn to its starting point. This trip 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 from school at 55 mi/h for 110 miles. It thhhj; x pr;dub .2(huo5en starts to snow and you slow to 35 mi/h. You arpb;;h.(doh 2uujh5xr rive 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 km/h. What is the bqxt19v(hs;e v -i : bfv((quiaveragevs ( he-tvbiqu:v(9 q;bx if1( speed 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 km/3 qbjcwx/mc a c0 8)d3ob/1ddyh. What is her average speed for the tr/3my 81/qwc od a3dcdbj)c0bxip?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane travels l7rcda s9tro1*z 3ic8at 300 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average spee *8 7c a3cdlsri9t1rozd for 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 anchorman (the person who runs the last 100 bps;vj i u8x0h,3b,(xa5v kqa m) for team A can run 10pb abhx 5x0 svj;8k3,,iua(v q0 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 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. Thp7p*e 1.z(onxj s 5otye car's average velocity during ds 5*zp7eynj 1oo t(.pxeceleration was 50 km/h. What was the car's deceleration while 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 increasebcd.ilv.p o ,q*2ye.rs its speed from 100 m/s to 160 m/s, at the average rate of lbvq ed 2.ycro .,ip.*$15 \; m/s^2$. 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 alv- *1tah:jo mae-7zpt 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 re (wjm*bj6ci0 vst 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 m/s for 10 s. It then speeds up with a constant ju(ua0; v+ol- hiz z8km1urk2 acceleration ofz 2rh u+m-uv 1au(;8izoj0lk k $2.0 \; m/s^2$ 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 a constant accelerat7/ 0j vn/ozd fhlu9z2rion of u9f/2/ro7z vdlzhj n0 $2.0 \; m/s^2$. 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 tk 4 4srrlbjrcv.j09 w.he right (+x direction) with a speed of 500 m/s strikes a sandbrwr.j rvckb4j s.90l4ag and penetrates a distance of 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 an airc4:wl8ruys6a7v jo l 0praft carrier. It reaches a speed of 42 m/s yrvpujo6l :wl4 7 sa80at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, 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 rest moves with con /2z-1v sd.itdnpbe1 a 15be i2yflr/xstant 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 msp+gj s ibvy3-ur-;y p2dg;9v/s in a distance of 200 m. What is its average accevydpug2 3ryj- ;ps9i v+-s;gbleration?

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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 undergoes uniform accelerfw6p f (:c)ppgation. During the first second it travels 5.0 m. How far will it travel during the th(gf)wp: fc6 ppird 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 constl5r-hw 93usm68dh e9y4 qxc dwant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is trave -l 85rc4qu6yhxe9hmwsd9d 3wling 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 and accelerates unoesuo3bk k41puk12g 9sz,;/dsecr,n iformly 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 roae 63dhgm qzq/ *3zaq1fd 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 bee ) rzapjj/ox 5td+slor07:o/(-ho isun waiting at the intersectio0osrjz(l-t5ar p/:d/os )o+hj xu 7oin 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 of 12 m/s on the surface of planeioxwavup )b9s*2qlb; u6d 8rd+t: 8git X where the acceleration du *dg8ui:st o8wrdl+; b xvp6a29uiq)be 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 upwaji45nibq6nk8(6)y c+g osbt mrd with a speed of 12 m/s on the surface of planet X where the 5g bt6 no4+ib8ni csj6y(m) kqacceleration 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 4jqqms, / x.zhm/s on the surface of planet X where the acceleration due to s mhx ,q/4.jzqgravity 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 speedqxf q1/ qqcyp/;2czx0 of 14 m/s on the surface of planet X where the acceleration du;zxqcyf q 0p2qc /xq1/e 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 hol ;gw/3f* sfbnj j-vsh-ds a ruler betwensvf- ;fs w/-*h3jbjgen your fingers and releases it without 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 is-cj q;0;byng t-vl*qq its velocity after 3.00yjc0; lqnqvb -q* g;-t 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 pointdz tl- u1ynu4g 4n-e9z in 10 s. What is the initial speed of th1 uldyngz -n -944zutee bullet?

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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 does it takf 3j g:sz y5z,h-xhyj(e to return to its starting pointhz:sj fz( 3x5yh,jg -y?

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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 w*086oi3 m ftsqjsfqv*ith an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high*j3s f8mti fqvq0o6* s 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 straight up with a8)ep :m *0ln4 eh(nt*hxyqjuk speed of 30 m/s. (only fill in numerical value in the blaqx) (0tn l *4*pkne:ehy8j hmunks)
(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 spn4rb .wa zngc:5zilw .,; cu0uqr8rg-eed of 30.0 m/s. (only fill in numerical value in the lagr ib g0 uz zr.4c nr5c8.qw:w,-un;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 an xl*(yg2ax t l2jay67t 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 the velocity at t = 2.5 c ljcrd7w,2m:ozow cl8w7u:)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 thez( +(t qow 5tminm4if9 velocity 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 the velocity at t = 5.ut.i z)h dhd; b(4uv3w5 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 4.01b*jpsf1ux ;a:) gpv,i )y hyg bie9:n 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 to 6.0 s?**3vbcrvq xn gq qek)(1pm9,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 acceleration +6(do,s8k hce9 r2dxcmjf zh(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 acceleratijdpsqq,ohh, 4knr0 ; -on 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 acceleration from 0 to 5.0 s?-pi ,on6g/zlr0;q eeyu 91yicux )+wf


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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 a5m n*yhxivtk :g 7y45qcceleration 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 the displacef5 vjh cc8ya4r)f0; :a, wkdhcment from 0 to 8.0 s?


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