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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 fr1oxk61j kqw u .max17hom one point in space to another. Make a comparison between the do1 ku7x6qah.wj1k1m xisplacement 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 oob/yy 57hm lg0bject equal to the instantaneous velocity?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A new car manufacturer advertises that their car can go "from zedrv+1fnp6u. hro to sixty in 8 s".pnhr.v+duf6 1 This is a description of

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4#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moving in the +x axis experiences an accelez(yzt6*nbh2y( ptn 0qration 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 thej; ltitk;d0wrd/wl7gdb) (0t East (+x direction) begins to slow down as it approaches a traffic light. Mtlbjw0 g(dw0d;lkd t7i ; tr)/ake 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 t yervj,gu2l(5 f(/n cWest (-x direction) begins to slow down as it approachesy g r/ tn(c,e(ul2f5jv a traffic light. Make a statement concerning its acceleration.

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7#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with au*fm6zk ),kyugh-v ) i constant velocity. Make a statement concerning its acceleratio)hf-z6vkyu ,gium *k)n.

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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 acceleration is 0wwl ;deol ck ;6+w m(zl*dv9hzero? Supd*;9ldl6m whw w 0k+coz;(evlport 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 accelera2 5c+kg/ yiol, bw+h7nspwg 1otion is constant? Support your answer with yokg,2h7 g +wpbol+ncs/5 iw1an 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 objecc32wm.q* ut fkdlm /m(t is moving with constant acceleration. Make a statement concern/qk mt 2u.3(m*fmwdlc ing its motion with respect to time.

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11#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object have increasing speed while its acceleru wfla1c: c0yri9s*wdfq ), r:ation is decreasing? Support your answer with aw0y1f :dri):cr*c 9ul wfsq,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)0n/ wo8,fd dtkr(pev along a smooth hill of ice. Make a statement concerning itst )e pk(wo,vfr0n8dd/ 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 avera(k4jb/ut1fg(ys,w: j z sy8ktge velocity equal to the average of the object's initial and final velocityjk gskt 4s(j1z(uf/tyy w8 b,:?

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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 a6ffwo 1q0,lwk/x int 5ccelerate at the same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that on kfwfi w1qxlt50 o6/,f 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 bot )sww6zpf) g-4xanh,jh accelerate at the same rate. However, object A acch4swgzp )w6xnfa) -j,elerates 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 b wgu;d4*uct )absence of friction, which of the followingubdwuc ) 4t;*g 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 a rqcodiyg2,87uu8p m7fuh1p 0 nd falls in the absence of friction, which of the following is trr2hdg77uq 01c fu ,8mupi 8yopue 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. xt/ff6 qc n7s2Make a statement about the velocity and the acceleration when the ball reaches the highestn /ctqs7 2f6xf 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 it 5w9xy ht eacf8;*ocjbj qjaz:*42(w ss acceleration just before it reaches its highest p5*jye4xtsz8 c(9 jqw2aja:wobf; c *hoint?

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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 mabmeq;ax -7 ov3ximum height, then falls to its initiavmx ;ba 73oq-el 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, reaches a t7ge5k+smvu;.4ep uq maximum height, then falls to its initial height. Make a statement about the direction of the velocitypm 74tk;eu.vqs+ge u5 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 absencj) djx-,,9one -mxin le of air resistance. Make a statement concerning9xxenod -)i,n j- m,jl 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 x2hna)q v(vy-)7y ulf;c1xk tfrom a high-flying plane. What is her acceleration when she she reaches texy)afyu7( kxl) 2-qt;1 vhv ncrminal velocity?

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24#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown vertically upward with a speed v. An identical secgsg5rs ho -*y;2xg*q ukv xu8(/+utc cond 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 does the second ball gox gs*ucou5v*( gr t2h8 gsqu ;cky+-/x 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 t.+;c:* zwurx n1 jwtvfop of a building. One second later, ball B is dropped from the same building. As time progresses, the dic ;fvt1ur*x.wj :+nz wstance 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 sqww5j p4b.du6p( t;ss*pg ae,econd later, ball B is dropped from the same building. As time progresses, the differe5gb eusw(q* pw sat.; ppd,64jnce 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 ntc ).*d6ehco up, and the other is thrncot.6*cd he )own down, both with the same 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 brick is throwntr6ijudu,h 67j-: *qa (avagj straight down from the same building. They are released a6t 6a:ua(- iudqvajr,gh*7j jt 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-zer1 +9 zsyuoa5tqo velocity in the +x axis. The position versus tz ty 95q1o+ausime 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 acceleration in the +x axip lcbe+mqn,hj w2 kx :5cjii5ho 5-p-un3n2j- s. The position versus time graph of this ob3k+:wj 5nc--che2l ph,m2uqnx-ioi5 j jp5 n bject 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 in the +x axis. Thwcw+tp;z+ acyutvzk 8yd80md2,m;t 3e velocity versus time graph of thism+d w20cktmzy3tpv;;cwt8a zd8y u+, 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 no2-um y 59m/(cc0wyq gg0le +p1o;.wmg rjvnxk n-zero acceleration in the +x axis. The velocity versus time graxm/2r0cync-(ygpg. l 5+gkq wumj moe;v90 w1ph 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 graezg(v 8gy/s3z9 g oik89s-torph 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 tim h5,1.6akmxku imd2u ie 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 ti az7turytjg.k - .(wk :8uz*rcme 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 velocity versus time3 pg r /(pl,eqpayl6,j 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 arg.qu7 e 9(5)ada kule horizontal line, the object ise(udeq9a5l k g).ra7u

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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 ftk+8 a lu c01b4.vq,g9 bjfmi 6c.bkaa vertical line, the object is .b.flc q +actu9mb06kj1ifv4b8 ga,k

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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 wjzab k z;5ki04 p)t2/xt:ipw object is a horizontal line, the object is/ibxi0p4 j 2pz a t)k5tw:zkw;

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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 grapp.b pe 4(ge1(bajmmu 6am,t3sh of an object is a straight line making an angle of 30 degrees with the time amg,mu1pe paej ba4( (m3 tsb6.xis, 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 nb ix9z- ;myr+k3ayhk *(;cmfsouth. Find both the distance traveled and the magnitude o k3f cykh-(by;;+m*zrmni9 axf 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 km/h 4 +s4k avpnd;es:gs:zht/tl* in still water. How long will it take to move 12 km upstream in a river flowing 6.0 t4 ska s* d+;4stln/phz:g v:ekm/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 mi = 1 0yo -t+j06i lfykk9yc609 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 64zpbgvh2f f -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)cha tn6e6b(i9 p3l2uo-xpw4 e in 2 hours and 57 min. What ib6ti(h9-2w6 noauxpp 34ceels the 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 kzbno9,a7 r-mv7 e ms;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 spee ;wumvwanwyur+ 7 n)o)g7oo .0d of light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mi = 1609 m, 1 yr = 36wm o.);vuonww07gnar) o+7y u5 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 alp b2jlxz4p578d8dv4ii 3m clmong a straight road and you look to the side for 4.0 s, how far do you travel durin75pd3lm4l 824b8mxdp cvij izg 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 arj znnec2,q wpxr9)pr7 ) 41yrpn hc,e7ound an outdoor track (400 m), in 100 s, your average vx enp4pnejrr,n w1)72 h) ,ycrz 7qcp9elocity 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 Polec,wl 4 w5 c/x)qsn v3vxb6vjd,. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to 65bdnqj ,lsv4c)w/v3w x,vcx its starting point. This trip takes 45 min. What was the bear's average speed?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels 1.0 km south, thena kx t*kzjxur7 9-k-s5 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. 9u-kjkx-7sxt5kzar * 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;) eht:d quf:+izsj*e /h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometown from )hjt f*ze:; +:ei qusdschool?

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53#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A motorist travels 1606we9wnnecj(5j1 eqa , km at 80 km/h and 160 km at 100 km/h. What is the average speed of the motorist for this5(j c,ewjqa91 ewn n6e 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 ebdmmz maq:o42y/cu0fp;-6t 100 km/h. What is her average:- mat0pm6 o4z/ym qbfd2ce;u speed for the trip?

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55#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane travels at 300 mi/h south for 2.000e f/ kdocaq 9 tmw*k:ez+h2d: h and then at 250 mi/h north for 750 miles. What is the average spezh0:: aq 2/c*kmf+ 9eotdwd keed 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 yj - aggc1 9rtzf2yeun9.;o7x) for team A can run 100 m in 9.8 s. His rival,c gxf j;y z7on.g9t29y-re ua1 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. T+/nboknzqid. 0:y5 pag d) x++,fu dlzhe car's average velocity during deceleratio )50x d dpu/ +y:.nnkazlf+io+dbzq,gn 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 increases its speed from 100 m( ltttq28rf 9l/s to 160 m/s, at the average rate of l fqt8l 9(rtt2$15 \; m/s^2$. 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 ofmg ca k w+73xm13wkw-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 accelervuux7yc4 tl9,/6ay g iates 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 conl76pkj- hks6jyxz( i4stant acceleration olj76x6( k jp4yikzh-s f $2.0 \; m/s^2$ 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 mw92roeu - nwh6 koo9 79yl6i7iehti 76 ayxl/f/s experiences a constant acceleration of yona79hf7tl69 2 x9 k7 uio6oilre-6hyi wwe/$2.0 \; m/s^2$. 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 da4zaso/3i, ay b */api 3j/qhoirection) with a speed of 500 m/s strikes a sandbag and penetr/j, h3ia/4abaopisy*o q3 /azates 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 cars5 o9hsk:lq k:, +bhmerier. 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 of th : e:lhmks9q5+sob, hke 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 accelera.c: jg8m8aeoqrwwie /q,2*a ytion 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 vf5e3zcql/w- .xupa q* - r lj*s+)wavto 80 m/s in a distance of 200 m. What is its average acceleratio.qxvzjw v+e* u5*la-s fapl-) rwq3/cn?

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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 unifo;r4eau*j vzq 7rm acceleration. During the first second it travels 7z*4rvq aue j;5.0 m. 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 with constant acceleration. Initially it;i yy dnidh46/ gp7iay2 .+sfx is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. Howp y7i+dn y/y 6.dghfia; 4xi2s 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 uniformly2ow, gnh6w 8qm6ysr6q 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 at abocwa- h5o+9sf1ss )34x mwmegn ut $5.0 \; m/s^2$ 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 l9luapuh v+41. v iad-that has been waiting at the intersection sauilp d lv ua.+v-149htarts 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 plane (p 8v zwgyn*i/m8 7w(pymmt)lt X where the acceleration due to vm8(8t7 m*pp z liywy(wm)g /ngravity 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 surfazt,mc0ndty6 ok /kl:ha hf :6)ce of planet X where the acceleration due to gravity isk:ytm k t/a 06) ,ch6:hzfdonl $1.5 \; m/s^2$. 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 t+( os2b kdgz,mhe surface of planet X where the acce+g(2odsk z m,bleration 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 with1tqdex)celtw(:q vl*yel e: 3bp;k9 3 a speed of 14 m/s on the surface of planet X where the acceleration due to grt3bqlty1kx e():el;d*v 3pecq 9l:weavity 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 grexb7*w6a .z vv 1wz:ozzater 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 befozz6:.17w wbo xza z*vvre 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 upwy4r6; ufdic;sw/ xr 0hard at a velocity of 19.6 m/s. What is its velocity after 3;06 wrr/us;4 difcxy h.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 x770s4uasb tdm1jb 4 ;smo2 gqup returns to its starting point in 10 s. What is the initial speed of2dsx ;m4m a o 1tsjb04gbuqs77 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 sp-q 7s-q2 vnhhg*ltxf.eed of 36.0 m/s. How long does it take to return to its hl2vn*q7 x.-hqgt-fsstarting 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 topzi; pj1l aa8h5 of a building with an initial speed of 25 m/s. It strikes the ground after 2.0 a1lji ha;5p z8s. 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 a s2bhhr vr196i pkcs6 6rpeed of 30 m/s. (only fill in numerical value in tr ihb66h6r 9s2p1vkc rhe 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 qqtmh/ 4salcz+9em lj/ ,.p( iair with a speed of 30.0 m/s. (only fill in numeripm(ht+aiq/zse 4.cl9jq, /m l cal 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 velocit46lq c+/)bbtx mjjb xm.* zju5y at t = 1.0 s?


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84#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the vel6dc/qu.0ep:mzsqh tph(m sjk6 )sa) *ocity at t = 2.5 s?


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85#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the veloc khf 3m,nbs):city 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 isi1mva rz;;2tqavm4z (b7axm.. 0w sla the velocity at t = 5.5 s?


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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the average veloi/ 65 :gatxkyxyu46locity 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 m2gu d(0ui d.stbkl824g1 )xky:b ufmfrom 0 to 6.0 s?


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89#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-2, what is the accelerk.w9ngfq, afp92ca l) ation 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 accelewv+ p x7uwe.wwo0nw u, :(3daxration 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 ac6z93sv qp4wkb .t- peaceleration 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 acceleration from 0 to 8.0 rqu6 c1o-iv9t 2)ehoh9 e5kp:kef w(zs?


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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 dbz0tsgd w tk3.g/a+q2isplacement from 0 to 8.0 s?


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