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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 anot bycg164y8)fzz;ol u oher. Make a comparison between the4o861 zfo;b)yu yclg z 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 theyd w7kwku( 0f- 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 advert,o bf.clc 8v,+-fddodises that their car can go "from zero to sixty in 8 s". This is a description ofbdff.d+8c d,o-c,o vl

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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 68muwq., pji )zq 9tuo+cp6iiacceleration 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 (+7zor6mi ug.33sz.aae cw,s:m x direction) begins to slow down as it approaches a traffic light. Make a stac3: w .or7a3,i se6g.zmmzu astement 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 s0 h7qui 2z73rdj) kwktlow down as it approaches a traffic light. Make a statement concernitu7 2 )zkwrhj7dkq0 3ing 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 q +x: 2 4c);atc r+gicrxwvd*rvv1y*k concerning x;c vy12vr )rrk 4+cgq*vwax:i +ctd*its 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 object is zero, does it mean that the accekj +x+hff4 v7/v rewe20cgly4 leration is zero?xwhf yv 7 4+fl+k2eecv0r/ gj4 Support 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 acceleration is constant?s-wehok+8a thnof- 8dz42d5 v Support your answer with an exk d8oah t+h-8noz- 42esfwd5vample.

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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 statementr:+.:dfq2hptt q o)s vdcw4d8dt3j:d concerning its motion with respect :sc2d3 :thd.t v rd+4)d:jwfq tpo8dq 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 whilef inqx.8jx8: r its acceleration is decreasing? Support yourxqf: 8nir.j8x answer with 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 axod *yh9;v8fhtn/)1 au/ q wszlong a smooth hill of ice. Make a statement cz o8dn*/1thv ;uh/a9fw ys xq)oncerning 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 equal to thejy i2( iv6(5n/n bugc3ve4iie average of the object's initial and fiv25/(c iyi ev4 njui(eg6 i3nbnal 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 start at rest. They2womlt 8*cdl* both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compare 8l2c*dlmw to*d 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 rest. They both ac 6mpwjs6 i,ts+celerate at the same rate. However, object A accelerates for twice the tim,s+6i6m jpt swe 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 absew-bh1c ftacpuv;5s (u(fvr71 nce of friction, which of the followinh1ucp f1vcb 75fsw (v-r(; uatg 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 fallbtz9r -s.yuly/xxe4) s in the absence of friction, which of the following is true con zr.4ely-x)u x9/ysbtcerning 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 statement about the velocity and ozo.rp2:; ;g4r lzf qv8gfcq *the acceleration when the ball reaches the highest poinrp84f qzrof2 q:.z cv;lo*gg ;t.

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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 acceleration just befor(f naqr 7ysp y:pcz645e it reaches5f4yrca(7nzsqp6 yp : its highest 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 bfll 3i l:gki8j w+4 d9m5udh,falls to its initial height. Make a statement about the direction of the velocitylm5w lhk 4d +gifdiuj8b93:l, 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, rfe im2 g4ctma53 vpi vu)/3q9keaches a maximum height, then falls to its initial height. Make a statement about the fuv m59a33 ptkqic4m eg)2iv/direction 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 the absence of air r * rqw5x94fbo;lyfyr3 esistance. Make a statement c*y5yl rqr9wx;4ofbf 3oncerning 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 juak4wz(t7 +ag m2fued.mps from a high-flying plane. What is her acceleration when she she rea + u2w g.(dt4e7maazfkches 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 vertichxl u gu.e.i 11 p b.alc8kl/5j(tkg+fally upward with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum heightlug gpcbl+ au5 itl 1fkej(h/.k81x.. 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 a buildapr-n8h xw5 r/ing. One second later, ball B is dropped from the same building. As time progresses, the dis8pw -nra5 xrh/tance 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 bctiqvpf+t )59uilding. One second later, ball B is dropped+cq9 )pvif5 tt from 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 throw+s/v fq88ei-vjdd x0f n from 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 they hit the stre-xdv/s8q+ di0 vfef8 jet?

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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 bricad):mf ( pfi,kk is thrown straight down from the same building. They are released at the same time. Nega,f)fd(k: m pilect 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 +-quq2b n9c;def hmx3 0/rue 4qx axis. The position versus time graph of thium4r n3cqq 2x eq9/f0bu -d;ehs 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 conwff 2uek*a3 4wstant non-zero acceleration in the +x axis. The position versus time greww4 f3u2k *faaph 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 r2msj3( *jssy+gsh. uconstant non-zero velocity in the +x axis. The velocity versus time graph of 3 ss. r2(h* jjsumg+ysthis 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 axis. v+ktm uo s bo:zf/+h.b:c0w.p The veloci+/hoocb zm v:sf.w: tk0.pub+ty 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 versus time grsrbsv 7x) :cm1aph 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 iilb /q3ov/kc9wj( n: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 vnxx.63w qg3 v( ckcxy6ersus 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 a ves rjj8is 8 1o-ix+90ti6wuzv3lac9y ilocity 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 lr ,:)7bbz .gxj ze1g+4-mew ixil b9baine, the object ijwem) xbgga 7b.:zr1iz+9l 4 b -,ebixs

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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 okej /y;4gbkfx 8yy1:tf an object is a vertical line, the object isg1/tk:ey4f ;8kjxyyb

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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 tim09bnc nyd+rl.e graph of an object is a horizontal line, the object ic0n .9yrn bd+ls

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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 za 8g db;3yy4e.-hu0pcm n6kbl 5,mroline making an angle of 30 8ulm p -m ago y ezrb.yd6n;b0hc534k,degrees 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 theigqdq7l s, -n4n 11.0 m south. Find both the distance traveled and the magnitude of the,n qg7l-q ds4i 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 km/h in still water. How long will it take tpi -on6fe1: ddn8aqm+z *cd-xo move 12 km upstrean: p dzfa+6o-*q8e dmn1dci-xm 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/vqw5) zmz4w 9 xyo3g+rs? (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 ;k jfb.x yhbc i7vu(6d2i6s1porder 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) in 2 hours and 57 min. Whh7y v s4nvo--pat is the7nsyp-v 4ohv - average 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 trav ypg0q :ntam;af 4(bi8el 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 thacd0-e-:k kcc-aylk w b;gfowf*6+ ar4t light travels in one year. The speed of light is 3-r a6 ebfk4- wkco-:cal*kdf; +0ywcg.00 x 108 m/s. How many miles are there 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 andu8a)y3:1b qe h dwr2nu/p4 ggi you look to the side for 4.0 s, how far do you trav23 :e)qdyuu4 bigp grha1w8/nel 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 aroundy3 lsjb8t :d;y2rw s:c an outdoor track (400 m), in 100 s, your average veloc;s8jsbc yr 3wl::dy2 tity 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 t d:g tuy. t ,b0xv8ds1pz59piiravels 1.0 km south, then 1.0 km eastpz9 8b gtdti10uvs :p5y,di .x, then 1.0 km north, then 1.0 km west to 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 mv:,wps0pqcvcsq6 c7+ v4c 1r travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 miqc0pvq6,w 4s s:1vp7vrcm+ ccn. 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 th+b,ssltu; 3zv28u3 g ui1gdhv en starts to snow and you slow to 35 mi/bv3d h+2slgzuut;i ,g1v us38h. 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 kn4*)g, a,lji seev4y2n9 i4kkaq;sx mm/h and 160 km at 100 km/h. What is the average speed of the motorist for this trip? m)ls, ,qn94 xi4y*j;kvee2kai4ag sn

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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 kk.,ts u1minj) m/h and 2.0 h at 100 km/h. What is her average speed for the trt u)j, msnki.1ip?

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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 then at 250 mi/h north zreuwa+5c99u for 750 miles. What is the average sc5+era99w uz upeed 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 pers-,s ydlk zft4qi23+9bs0dnslon who runs the last 100 m) for team A canq+9sys2i-t,4 3s bnf0 kddlzl 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 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 (4 v vjjpzovb19 g-pxzs +7wq7and comes to a stop after 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's deceleratiov p9jzpoxvw7qz4-s 7v +g(1bjn 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 increases its speed fzu5w s*ri wjq6(5ux y8xla-gcu +5js; rom 100 m/s to 160 m/s, at the average rate of auww *isu5c- yxjur(jl;55zs6+ 8xq g$15 \; m/s^2$. 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 a f3 wmeq8 g9ric+qs0;nq9d;prate 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 and acceljr o;xg6,oi- oerates 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 :qx;d:nq kij( 10 s. It then speeds up with a constant acceleration ; ik(:xdqnj: qof $2.0 \; m/s^2$ 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 accelerat-q ,kfumnxb8hfz n ,j(6f1r /znj/ a;nion on,jbrm(1;qn zj / 6fxuzh8an nkf/ ,f-f $2.0 \; m/s^2$. 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 ae *2w;fabd t;v2ub0wnirw3 -the right (+x direction) with a speed of 500 m/s strikes a sandbag a2auw0 bf;e*dwv;-a3iw nb t2 rnd 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 di 7fvd/+k lnc2zojrnm,/65 wan aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming thl/w +i mjrzcdvo 726,k5 /fdnne 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 constant acceleratvgvwo ux/1) w/ion 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 average ldy t *gw oqt,wb68u,5accelera*gb u8,toy6t5 qw ,lwdtion?

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67#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object starts frolguz i(nll,pc8pa-9)m rest and undergoes uniform acceleration. During the first second it travels 5.0 m. gl8- nzui,lp)(p ac9l How far 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 straight line w)s m* mp uvj0yjz)3cffcc62e4ith constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far doecc2zue p3 0f6mm)* fc4)sj jyvs 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 accelerateswb/sd axd(2e;6ze9 xv 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 atk(dk6zcb9+bf tdgc+8 jx; se1 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 ca ,te pbb1:io;br that has been waiting at the intersection starts ahead with a constant acceleratt1 ; ib:e,bobpion 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 planet X wh/ 2v ro/tk5z2de;dzuiere;5// vuk2z eizdtro2 d the acceleration 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 12 m/s on the surfac imim+sw46- )ro9rp gne of planet X whe ni +g)rmm -6rsw9opi4re the acceleration 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/srnc) : gej(ra. h3u9bs on the surface of planet X where the acceleration due to gravity ig3h9au.c) nre b:j r(ss $2.5 \; m/s^2$. 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 sisi w9hm a/fec5,+nscc35, j with a speed of 14 m/s on the surface of planet X where the acceleration due to gravitye h m,isiajs,3fccsn 95/c+w5 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 greatershumn/c t( 6z5, ro0fd than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall before youcs,/5fdn uz0ot6 rhm( 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 velocib2d7vg ;ncdks08x7 .zk1r,bz*ciozqty after 3.00,n*71kd;osc 0q . d8rbzzi k7xg2vbzc 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 ie ew69ivn/ls.1i 0esup returns to its starting point in 10 s. What is the initial spei.eln9iv 1 6ewi/s0 seed of the 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 take t8+ik*f9p/j r qgfch o/o return to its starting pc q+r 8g9fio /pkhf/j*oint?

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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 of,)) 9iwtoffu a 25 m/s. It strikes thuwo))ta, f9 fie 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 straight up with a06rugoc rd hyn+;p7u;p 3/vww speed of 30 m/s. (only fill in numerical value in the bl +6pwcwvrh ; ng0 ypud;o37/ruanks)
(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 6 ,ntdavrs6x( -.kapgair with a speed of 30.0 m/s. (only fill in, 6-pgr.6avknat d s(x numerical 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 atp)wn byb.6mw w1+fm*m 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 6+ip4+lr5z u uhzmew*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 vi to7,f iv7a*zelocity 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 qhn;re::,awoyrx/3 gthe 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 sv tic+ p3w4f3.* fqztv?


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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 6.0mg qzqa.e 4gzx;dt716 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 ; tikg h:ioq1+4s -gd9mimquw r/2s 7qacceleration 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 accelergiwf3hk z)10 fation 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 tosan h s)s3h2 ernvj4i4,.gcv1 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 yo kfdp8,ux.; the average acceleration 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 displacement from 0 to i( y qg:k qpw6: bygr1(6brg;k8.0 s?


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