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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 another. Make a 7 za8 sp t :zx6nqbp3ozjyb4/4f2z8obcomparison between the displacement and the distance travn6 4t:4b/8qxz oo 2yzpbjbp7fas3 zz 8eled.

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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 velocitydm((x cn /tfd+6 zs5go?

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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 advertis k+w2srul+ez9ef. c q3es that their car can go "from zero to sixty in 8 s". This is a descrilz9w esru+3 f2k.qce+ ption 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 thfad 51ana id96e +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 tol1b6e *7 epl2wq7bxub the East (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its acc1w lexu67e p2l7q bb*beleration.

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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 txop 74x4 zd vx90 (,1kaboyjplhe West (-x direction) begins to slow down as it approaches a traffic light. Make a state p4j ax xo,kzbpo04dly17(9xvment 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 a constanoij3k6ugnc43*moq7,m/eq a 9s az c1nt velocity. Make a statement concerniz1 e jo67kocmqac*4/gs 3,9m3nqu aning 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 meanza0yfaq -,vw9f )/ ebu that the acceleration is zero? Suppvaff/ zq-ab 9,e0wy u)ort 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 ch1,y j, i2flnyro)b6gftdl,b:ange direction when its acceleration is constant? Support your answer with an ex)o6yg fnj,t ,1il:2fdbr,lby ample.

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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 o y/s:,nyfac7rfre 07 moving with constant acceleration. Make a statement concerning its motion 77/,fnaeryoy :fs 0crwith 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 whil8ips a0xm35: xd/ gu2ibnn :sae its acceleration is decreasing? Support your answer with an exagu/xi i 5:s x3n b:p8dasmn20ample.

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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, mo8t0 jrpb)rjh. ves up along a smooth hill of ice. Make) 8rphjr.0 btj a statement concerning its acceleration.

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13#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Under what condition is average velocity equal to t n-*c9,ik 4k rqbl/jvzhe average of the object's initial and / jrqv i*k-n 4kblzc9,final 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. They both accelerat) k: wyksx)z vg-6mykh3x 2s+ke at the same rate. However:hmykg sx -zx36wyk+kk2 ) s)v, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of object B?

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15#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both start from rest. They both accelerate at the same rate. :xb(fjw: 0 l d*(3f :fryuko8gbbhu*qHowever, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that of object B?bfb:uybf (h:w * k0ul*oq:frd38gxj(

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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 fr-t)mp 96hblrnu84 opex2 1pqyom rest and falls in the absence of friction, which of the following is true concerning its motion?nyrut mp69p8-p hb2) xl1qoe4

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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 re-,qme si)h1difj40z+ nq + ltvleased from rest and falls in the absence of friction, which of the fol+4f sl qzn,)ii0jmvdq-e1+htlowing is true concerning its motion?

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18#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. Make a statement abxvc+gqus4 n-5 out the velocity and the acceleration when the ball reaches the highgcvq45 su-+ xnest 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 bc.fmsa.zi 9.oh(na ats-1j 7 lefore it reachesia l.s7 amo1at hc(9sn.jz-.f 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, thet:f9 sss 5i7z 1 zu4n d.hifjqyfx3)a8n falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball is goi7yf35i8ha z1nxfs d zqti4.9)ssu:fj ng 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 itilqd20p )a r8ts initial height. Make a statement about the direction of t20a)l8pqd trihe 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 resistance6;lwh b;c0v9aow b.t d. Make a statement concerning its acceleration;0 obb tvh;w69da wcl..

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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 plmc0blm )jbov)+3fld7ane. What is her acceleration when she she reacheslb b+lfcj0 73m dv)o)m 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 vertir8w1wttp7d ; qcally 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 height of the second ball to that of the first ball? (How many times higher does w87wt; td 1qprthe 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 secu0xs)(ghh87ty wr m *gond later, ball B is dropped from the same building. As time progresses, the distance betweenm87 w*xuhggyr(t)0 h s 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 fr ey,a)blx*2mzub):g +vpy .wcom the top of a building. One second later, ball B is dropped from the same building. As time progresses, the diff.e :wx p*au,mbg )+byv)czly2 erence 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 k z5 s:qr xyia37p2 xx:f;oyx4top 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 p xzia7 :3sxyyk42oq xx:;5frthe 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 (+ l8 98jhgqjhb8x3 hfuivcf-the top of a building. A second brick is thrown straight down from the same building. They are released at the sljcb h qju-8h3ifxf988hgv(+ame 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 velocityzjecdv7v:w3 5 in the +x axis. The position versus time graph of this ob7wzcvj3v: 5de ject 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 axis. The po;5edz tcqd1vq46p x :gsition versu :5qpe;zt g46d1vcdqxs 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 in the akpuj ; n.n 67ccpxa-(+x axis. The velocity versus time graph of this objenupc-x6 7 jn.apkca;(ct 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 acceloe :oc7ki v+i;pf9b1ueration in the +x axis. The velocity versus time graph of +bo:efvoi9u; pk i1c7 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 vwkf jfu ; dekp6uxn0ua **p+36ersus 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 giv /ndgb 8; kpxqsguj-,b47uui2es

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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 acvs:2gw;(y)m+j f ighhceleration 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 curve in a velocity versus time graph givqoycq4:u( xzf r 67h)+ie+cjqes

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37#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is a horizontal line, the obje am3o3h cdnf. wx-sj:o 4.fr-f b*mhk,ct i bxhmco a-4f.d nj:fw3om* f3 -,ksr.hs

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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 grapz2u0w nw(bur6*gq1p aa*2 0vxegmyvt j 6nk68h of an object is a vertical line, the object ist0rwu8n0 xa6py bgaqm e z gvuvj 2w1(6n6*2*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 ofq7xj /t(m:arm an object is a horizontal line, the object rx a(tmq/m:7 jis

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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 gpvec ,,(x2xx draph of an object is a straight line making an angle of 30 degrees with the time axis, vcedp( 2,xx x,the object is

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41#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object moves 15.0 m north and then 11.0 m south. Findt:-s4kf a 5d-f3psaqk+w g, pc both the distance traveled and the magnitude of thekk-4:5a+p sd afw-pqg3scft, 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/hv.1,eh xlg,z g4w )rhqduq+1r in still water. How long will it take to move 12 km upstream in a river flowinherqd,rxh z v ul)1+g 4,1wq.gg 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 mbg yf qdogka61 dj j)qlsy q.cm;9*570i = 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 o9de2k un5:uorrder 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 cf l07r6gmr* a3d2 sdo peap//42.0 km) in 2 hours and 57 min. What is th l/6ga *2p0a3 refop/ cd7dmrse 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 takbj x wv*xhgu(nl*zul /1+a 8*se 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 g0d)opfwco q 5ijmj8z* (5m -lthe distance that light travels in one year. The speed of light is 3.00 x 108 m/s. How many miles are there in a ly? (1 mi = 1609 m, 1 yr = 365 8zjgwipmo() l c0oqfj *d5m-5d.)

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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 l)qse vp0 :shfbf;t*hzov3fa r:5++tyou look to the side for 4.0 s, how far do you travel durb ) f:ffzh*pvesq;ot3r tvs5l:h ++a0ing 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 around an outdoor track ( co(c(mu qtb0hu*c1 -o400 m), in 100 s, your average velocity i(cqbcc* 1o0-uu omht( s

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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 trau*ni2fq3 c;of+ rg2 r qevi5uc9m*io0 vels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km wes*cuifv9c2gfuq ; i3qro0r n e+mi2o5*t 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 Norqd )ve2;h9of/qk 7 qvmc0tqkq k 9-f5yth Pole. It travels 1.0 km south, then 1.0 km east, theq-f 9 0yhkk/efqkq9tq 7)mvvd;5qoc2n 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 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 mi0a (o pwm .)shqn*ls:/ ycg85 fdt*bgrles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. Hb5qna/)*h0 scgp8 osl (.w :*tfdrym gow 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 a :qbc:; wq,gs-ld*yv wd6 -oqot 80 km/h and 160 km at 100 km/h. What is the average speed of olyd::gv -qb s,qw 6w co-q;d*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/h. r/s 0)ku6r8tvyd /klp What is her averd)/6s0yvkl/r up 8tkrage 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 2.00 h and then at8tc j gha.97/c8mnefs 250 mi/h north for 750 miles. What is the average s 8 8g t97hjs.mfcac/nepeed 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 anchi .)pyhw1cz mt 884ijpx5,y*j hzz,cg orman (the person who runs the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman for team B, can cover 100 m in 10.1 s. What is the largest lead the team B runner can have when the team A runner starts the final leg of the race, in order th)zcp,8mhc1pj 5j.zhtiyi8z ,g w 4x*yat 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 comh8q 7hk cbxho0.5ddo:n 6fu9des to a stop after 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's deceleration :o7ohh85hfn d9.c0bdqx6d ukwhile slowing down?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane increases its speed from 100 m/s to 160 m/s, p/-yxpzg 6 8 +v), cbkvrwdg1tat the average rate of +-b/yrz)vp8, cgk pgtdvx1w6$15 \; m/s^2$. 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 accelerat6r,6nf*5 owmx, 1o y4fehb* -ehjru ali vw0)xes at the rate of $2.0 \; m/s^2$. How much time is required for the car to reach a speed of 90 km/h?

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60#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart starts from res s;a:a ;+jy+ns6kzr-o :dxnxtt 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 acceehb ma(t7v x)y r*.yekfh59 2oww+7dyleration wde2 e +kvybxw(yh) 5 hat.m*77f9yorof $2.0 \; m/s^2$ 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 velocityb zaetf,cw(9*g o(j+t of 5.0 m/s experiences a constant acceleration of bzejta *t(+9 cgw (of,$2.0 \; m/s^2$. 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 spe,vp * tkc3inm)ckqb b8o:e7v:ed of 500 m/s strikes a sandbag an,)v:m k tck3pcb :7eo*nvq8bid 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 a 2z.jsjat)c biuj ghizt11lia p0;)j+os/11catapult on an aircraft carrier. It reaches a speed of 42 m/s at the end of the cataput u1jja0ipi;is o 1zasjz /1c2 h+bt).gjl a1)lt, 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 constanobj gy1;j (i* fg:t1v/ pytr9et 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 distance of 200 m. x8s2axs2mrbk- 5 c/d c wp9na( What is its average accs-dkw 92s2m5 xxcaabn p8/c(releration?

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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 ac(vo6 (9wjuyjm+1e6g0 mady-j0f qyecceleration. During the first second it travels 5.0 m. How far will it ta(mj mj0ef9cj-qv y6eu0y+w16 (dgyo ravel 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. Ini h8yz si4+wilcu .y8w;tially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does yiyhw88+ ;lc. iu4wsz 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 uniformly at /0 apikiwb:3o $3.0 \; m/s^2$. 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 d se6iyk-zbm 3kd5z9 ;kecelerate 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*3ds:a1 mdc uk light turns green, a car that has been waiting at the intersection starts ahead with a constanudk:1 *s ad3mct 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 saqi6a is(h7fk*j8qsax ; 5et3peed of 12 m/s on the surface of planet X where the acceleration due to gravitqaaxkhiqa87 stfi j6* e(;53 sy 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 uadpvjc2c)185d 3 w1/a fyhoeepward with a speed of 12 m/s on the surface of planet X where the acceleration due to gravi5 13o/e 2dafdy wpjeh8 )c1avcty 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 X je4f(ohfi 7lx+7rj2hwhere the acceleration duefx7rhhe oi4ljj2( +7 f to gravity is $2.5 \; m/s^2$. How long does it take for the object to return to where it is thrown?

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75#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 14 m/s on the surface of pl1w a9je lo; uo+2mqr7qanet X where the acceleratia2ow 7m+uore9jql1 q; on due 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 usuaoclde(cw-wmq p0,-n p -:6jholly greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far cp-ccl -eop,q mwo:jd-60h( wn an 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 itnnc*.txy2t8 ) esa:y*5sjbous velocity after 3.00eb *a8xs.n:y nosjuc 5)2 tty* s?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet shot straight up returns to its starting point in 10 s. What is thep(ad(rliy1;9qk7txv7tq sa 0 in xi v rsqyaapl7 79d;0kt((1qtitial speed 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 3g qe:1 sw4yx(ebpfx 426.0 m/s. How long does it take to return toxp yxe(sf2wq: 44e gb1 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 bui+xazyb 1o. y e:j3tp6k9ibl:rlding with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high ib9o.::rybyxi6j 13+p t kzl eas the building?

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81#
 
填空题 ( 3.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed db4p9x.3y*t 4 .9.w2mb ueuf xgpnjvz of 30 m/s. (only fill in numerical value in thwdp9utm3 g 42xebf. .uj4vzxpb.9* yne 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 o f7 8-oj :2lafecztzf8f 30.0 m/s. (only fill in a8l ofe z7f-fc28t:jznumerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.    $s$
(b.) Calculate the maximum height reached by the ball.    $m$
(c.) Determine the time at which the ball pass a point 25.0 m above the point of contact between the bat and ball for the first time.    $s$
(d.) Determine the time at which the ball pass a point 25.0 m above the point of contact a second time.    $s$

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83#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the velocity at t q0.v 7cdo-h13wq6rjwkzua +g = 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 velocitygbe8zf3vd((,e ,xi g-rw v po6 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 velocity atw/ 3ist zn; r *)jwa2cpt30ybz 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 velocityb6 k)+802nipg-) vxxet lmqn a 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 j8nuy+c31,t qkm3:mfz9 dwoe 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 r6y+)oif9eg:a +ji kys?


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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 at 3i:vd/vic 6se1.0 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 acceleraty83cq - l 9f)7 pvpbkytp9+dwfion 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 i/x.nx)h 2m*u gjome0to 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 averr*apl/zj xvw49+q v. tage 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 w97y : 2guphzvqc o/3rz3y2zv to 8.0 s?


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