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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 spacek82exr0tffa:peqh, zmvn, s 04ym/j / to another. Make a comparison betweee0 tf/ /qvz y8,pnmmj:a k,rs04f2hxen the 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 instantaneous velocityzn cs y4nq ug3+cw-(4h?

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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 cwtiem, ks-*g-tpa: *xar can go "from zero to sixty in 8 s". This is a dextm*a, is:-ekg-*tp w scription 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 ,2 pr+z,fs c;rl ;*-lxi zsifl+x 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 direction)g ydwipqp x )0s5b :3/.npyzk; begins to slow down as it approaches a traffic light. Make a statementg 0s3wxppd .pbyk5/ny z)q i:; 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 (m dc 71l29dtan-x direction) begins to slow down as it approaches a traffic light. Make a statement concer297atdln m1 dcning 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 lia lpx(aw+bq751g1 tmoving with a constant velocity. Make a statement concerni7+ilq1 ag15x pla(btwng 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 objd4q-tx 3lz9+zf ,0buqt3 v oiyect is zero, does it mean that the acceleration is zero? 3 +3yb,qq t4fildv-ox0tzu9z 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 velocis)giin8wg* 0 tteg,/bc6u9 y wcb. /ghty change direction when its acceleration is constant? Support your answer with an/gey) *swc8gi0 g6unbc/ ,t.b hgi9wt 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 xv* )f ip5e0x iwp5jl(constant acceleration. Make a statement concewxpiji*50 (5)ep lv fxrning 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 speedz9d.mb)ep 8dptn t1:q 9*t fcj while its acceleration is decreasing? Support your answer p):d dtmc89*9qzjt fpnt. e1bwith 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 inikxm,h 8 kf/my;d7)khptial kick, moves up along a smooth hill of ice. Make a statement concekp k)kym8mxh;hd/7 , frning 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 the a8 tm /s4zvzj*bp :q o(ywl8+htverage of the object's initial and final velocity?/(4qbz :vm o 8jsyltp*+ w8htz

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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 same raz/d ggb-wi 4l9y-/usp tw/ mk/te. However, object A accelerates for twice the time as object B. What is the final speed of object A co4w//d kz-bgmg /uliwty9p/ s-mpared 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 start4n/1 o-updzh3*9hi9 ybsx)pg g;skzt from rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance traveled by objec9dx-9 / bg *kg psph1tszzno;4hyi3u)t 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 an)t 4d; t gang :aj7v(w11bkujl-nz/ked falls in the absence of friction, which of the dgu nkj7az:b-at4j( ek tv)1gw/n;1lfollowing 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 i3by42 )l0x ) o etpq8wxfi:izkn the absence of friction, which of the following is true concerning its motzi2 qx0ix8wfo:) t pkyl)eb34 ion?

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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 throv q*j 9(hd zmogp55gd.gvj(+pz z+n)iwn straight up. Make a statement about the velocity and the accelera+qo. g(jpvd5 mdhg9zig +pz5( v)j nz*tion 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 acceleration just before issh*2:w id k.mt reaches it.i dswk:hm2s*s 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 u2sy9 syn;qszd/ g1x8fxb)ev1p, reaches a maximum height, then falls to its in1xxne d s1z8sybfgq9);vys2 /itial height. Make a statement 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, rlq7 m2fkz:p pkb q2y7u3fe0- reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as f7 qq20 mpu2yre7k-fkpbl3 z: 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 resisx 2bcf,rrj,6l tance. Make a statemf,2 6jxrc rlb,ent concerning 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 fau5qmb2n : hi7o fh7;d3hwwk;jb- ;ezrom a high-flying plane. What is her acceleration when sheoa27h;nhdzjk;equ7m-5 w;w: hfbb3i 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 with a speed v,ex+ ahi9kjbtt)qs 66 . An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratt,sei6qkba6 j)t +xh9 io 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 a building. One second later, ball B is )glb0:cyv wt 9m cdca:li)m5 r,1di 5idropp5),0mwdc)byill gdi 9 tr5:m1cciv a:ed from the same 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 ou*-gf* m m;zgsecond later, ball B is dropped from the same building. As time progresses, the ;-g*m guozf m*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 of a tall building. One is thrown up, an xo+n6vaq6 wz r2+ygl/d the other is thrown down, both with the same initial speed. What are +wog6 ary l+qzxn6/v2their 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 q6nu;st;ylm a (+-w.(q nhnmk thrown straight down from the same building. They are released at the same time. Neglect ai -( n yaqwm6mnut+ qksn;;l(.hr 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 axbc; dmx4rc2x kpp2v xz d*06:ais. The position versus time graph of this object ipazpdvk*c6;d: c0x x224rmbxs

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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 ,bg: o 36c ymgeb:uxc:constant non-zero acceleration in the +x axis. The position versus ug:bc,3bc6yg: o ex:mtime 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 wi;b(*xmt awozu9l z 4h4th constant non-zero velocity in the +x axis. The velocity verl4hab(zo *m; wx9zu4tsus 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 noadk67c /6sib- g p2dhcn-zero acceleration in the +x axis. The velocity versus time graph of this oabcp7 ihkcd6 s- g/26dbject 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 ve6g6rd rcbw l*;rsus 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 graph gives0u cg8iiwr+8-k;y dwr

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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 acceleration5/ekjqvs rz+w1s i(r5* ujrp. versus 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 cur/ khjxmq)c6 p(ve in a 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 lix ttw/(ul.i c5ne, the object i/x ult5wit(c .s

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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 anomok .t32+gf1rlg+mk object is a vertical line, the object isl gtf.k+ogk 1+3om r2m

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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 line, the objed4dy 5z9 tm z*58fubn,a k(otbct i fou 8,9a ddbyknz5b t5*z(t4ms

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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 aaf udj1 /5 2:/s- ltjyix.pmqengle of 30ip 5e j12y-/jl/md xasqutf.: 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 then 11y8.1oyn(xrgjd swx3c jw q51 *.0 m south. Find both the distance traveled and the magnitude of x(1w .oj5x8 1dy*n gscyw3qrjthe 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 sti2p4l(e6gv3n 1d tzzh yll water. How long will it take to move 12 km upstreamz pl(3hv6ze1 ydgn4t 2 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? (1 mx3; b9. cinqtli = 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 tv 0uo4q4it(nwg gv-0 yo 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 and1 y/ vp.:prpft69qn qt 57 min. What is the average speed of the runner in m/spfq/:p. tv 6rnt 9yp1q?

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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 l rsywk 3ahe+i; o:y*;v5yfr2yong 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. The speed of dwj(q y.cji m+y15ap+la( fw 6light c5pq+ fy (.a jild(1jwam6y w+is 3.00 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 and you looczl yg134tvko( dgj3qwv6l,bdtq xn1 z1h*)2 k to the side for 4.0 s, how far do you travel during this inattentivehll*v,gd dq 3y3 vn4cb zqtg1 1t2o()z1x6kwj 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 ; ,nt py+hra.ua 3gk+dan outdoor track (400 m), in 100 s, your average velocytnh 3u dp+.agr+k;,aity 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)dvyfu8 (.kxohro5d8gy:mh . , 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 min. Whatdy.8y8o)mv5 hxoru d: fhk.g ( 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 tra)3hnikrdtm-h3sx ) )ovels 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 min. What was the bear's averag3oxid )-)mnr)h3 h skte 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 dngkjx)/ gi. )then starts to snow and you slow to 35 mi/h. You arriv nkg j.xdg)i)/e 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 ado rm2 8nbu/ qdh7gz-2 t2.rjrverage speedngq -/r28rr2 7ujmb o. d2hztd 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/z ,7p hg0e1oc x7xq4ll /dpn(ah and 2.0 h at 100 km/h. What is her average speed for tn0xpq7 z l4cl,pd1a(eg7/ oh xhe 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 sout:j:ryavqy , jas4n v,3h for 2.00 h and then at 250 mi/h north for 750 mileya: yqnar4,j v3:vj,ss. What is the average speed 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 m)umg2).79pu nh+e velt 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 pm .v)n+u2h7e9tulge 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 unift7ny t* kprza+w:kw(:ormly and comes to a stop after 10 s. The car's average velocity during deceleration was 50 k*arzkkwn7t :w+tp:y(m/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 increases itsh i :79j 13m g1vzoupkyil5aj- speed from 100 m/s to 160 m/s, at the average rate of 1vplyjo hi7 zk mu3ga1i 9:j5-$15 \; m/s^2$. 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 rate o73 6fxszqz6ell+ 8n nayk,4wg ut *kec,z qr):f $2.0 \; m/s^2$. 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 accelc-b3g*ge qgd g apgxa26(8-coerates 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 :t7j n yzm2uj0then speeds up with a constant acceleratioj 2jtu7mn y:z0n 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 a constant accel3htuyrc3-4t 4n ca/hoeration oft3-tho /u4n3r hcca y4 $2.0 \; m/s^2$. 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 speed of 500-0m4*nb(2 k aw oonhce m/s s2oweoabn 4nk(m0*h c- trikes a sandbag 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 aircraft c0k)pf1g ya l h,q/zxsx2fb6q7k m6a c7arrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is qqb7a,f1 ac2x zh6k7sm/xpf0 6lk)yg 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 moved.s+77n jebojvb3/ese b/)nf s 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 distane nu 6wr ae0g slsxux;77f6)1i7wdvm -ce of 200 m. What is its average acceleratx7euwl7a71r i- msx0eg6n)w6 usvdf;ion?

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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 acceleration. During the laeo:cl4k hrp57c:b4 first second it travels 5.0 m. Hohpkr:45 b7 :c 4loalecw 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 with constant acceleration. In9aq /ah :itr/x-8fe 6 ;qckkclitially it is traveling / 8f qraq9lik /c6kxte;-cah :at 16 m/s. Three seconds 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 ibmai6or1 2jdy53 no2 and 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 r:i*f6 : ymkbjcan 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 y c (kbi5o0ng1green, a car that has been waiting at the intersection starts ahead with a constant acceler10 (ogik n5ybcation 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 5ygnd2: jn zm-upward with a speed of 12 m/s on the surface of planet X where the acceler nz2mjy5- n:dgation 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 spy2cg5 g; ler5keed of 12 m/s on the surface of planet X where the a l 52eckggr5y;cceleration 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 of planet 1.;dlevwp u 6 5eko9haX where the accelera6akl51. p huewe dov;9tion 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 wiflor yl6 m77 (in)c-jith a speed of 14 m/s on the surface of planet X where the acceleration duei7( mf6 r)cl7y jonil- 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 0.1f0ap e nj87nb80 s. If your friend holds a ruler between your fingers and releases it without warning, how fej n88p f70nbaar 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 ag)d*stq -**dvb4d pi,ww1hm pt a velocity of 19.6 m/s. What is its velocity after 3w)b*piqgsd*t ,dvm d* 41-hwp.00 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/ vf*963p ntbuqo-jyr in 10 s. What is the initial speed of the bull o/nrp3-*jy6bfv9qu tet?

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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 h-ddgq; b)q:w long does it take to returwq g);:h bd-dqn to its 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 speld3:k ztdox+ mgnl/9u hmb//)6 tf+kg ed of 25 m/s. It strikes the grounm / x6dn9+k bkgo3)ml/f htz dg:lt+/ud 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 strand: pb db6z69(o:nrim ight up with a speed of 30 m/s. (only fill in numerical value b d6nz(o6n:i m :drpb9in 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 into the air with a speed of 30.0 m/syw ctwms*9n ;svlh+, a c2j4; ywnjs5;. (only fill in numerical vjj;s; *myn;w+,c tc wvy4 2h9al5s snwalue 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.e;gwl7l 0vpk qj-4e i00 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 2*u jjuxdtwzi a+4-w0lf*d:v 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 velocityt4xnm +69 ctapw( o*ncypp)i1 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 kxhfng o./ob21-g gi9at 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 avd4q ex v;6ut bhs-ft(.hcrgjr m; 67q2erage velocity from 0 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 to 6.0 /tp ksc3v j/ h4gtqc* 7c1)wogs?


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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 acceleo;,efl7l i6l kration 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 acceleratiopvy /6qyxbfbh 0s)i*t7x.oc:n 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 sm.jf 5,1s1 l;m5 ukoxsgj-bls?


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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 m)-wp/0vd( t tnw 7 cew4 nefq4tv1y:s0 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 8.0 s?wkbob kox o .wd*o;651


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