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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 trtyd 8hpna0/d0 avels from one point in space to another. Make a comparison betweend0h08 t/d apyn 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 instantanf5 xeospi4oo1fjc/kgg :p295 eous 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 adv 8fui/d* lxw1hertises that their car can go "from zero to sixty in 8x/h 18idlwuf* s". 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 accel7v + r:pjos4q5p*qmb;nyvt8i.3j4 z 9ac d rloeration 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 (+x5.r hk0n3 f0od2ib3 bw(o ehds direction) begins to slow down as it approaches a traffic l b03 o.hn2f0ehb r5dows(3ikd ight. Make a statement concerning its acceleration.

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6#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to thh.npsf qt7 v- ,mv47pbe West (-x direction) begins to slow down as it approaches a traffic bmh 7,p-pv.7t vsf4nq 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 a constant velocity. Make a statement ca2 ke4yko(wskqpdf/ j, u-o3f 5,x-nloncerning5 -u,kpf/kokxlneof wjd 3 q(say-42, 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 on/1 imt+ fdgl2bject is zero, does it mean that the acceleration is zero? Support your answer with 1t n+l/fd2i mgan 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 acceleratiogrwvr+ 7t *fv7)(opadn is constant? Support your answer with an example.)ov7 vg*wpra+7 r(dt f

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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 azafx.9 i u)a.ycceleration. Make a statement concerning its motion with respect to yxu9ai zf).a.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 -v,9 (tf2 bqm8y g8;ysiofpnaspeed while its acceleration is decreasing? Support your answer wit(va8n sg bf,-ymo2qfi8;p 9yt h 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 alo:eu --ft30/s)s fc v2ayjnunvng a smooth hill of ice. Makentna3f f: csu-)-evy u2sj0v/ 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 the average of the f e1 /f3q9-vfelf3oe cobject's initial and final veloe3/qfv 19cffe e-lf3ocity?

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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. Thg ya*1 ss *onlcbk3(-tb 6bj1xey both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is the fi xscg*jot k bsb y*(a3n-l116bnal 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. H.iax93.d+ 9 y c0uh5tazsz1vo6 blihuowever, object A accelerates for twice the time as object B. What is the disv19zhbua t xc .6 ylii3ua5doh0z+9s .tance traveled by object A compared to that of object B?

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16#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  When an object is released from rest and falls in the absence of f dkr - augadd5d b;;nhsm09 e)984xnzyyf( 3mmriction, which of the following is true concerning its moti 9ndxm yg 8my(;a;4-b03m5dhdfna zdu9s re)kon?

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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 in the absence of friction, whiyy mg7gh(:nm7ch of the following is7hmyg :(7mnyg 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 about the veloci5qx*yixaq dxgc o/:q:8q 5c-nty and the acceleration when the balxqog :8-i yn:qcx/d*qax5 qc 5l 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 dc,u-nw. di 1a; k 8.3ewgentqbefore it reaches its highest .wwen diag;qe-.u3c n,dk1t8 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 strpm+y-(h8hp) /lyo n9 (okver1s)qtgj aight up, reaches a maximum height, then falls to its initial height. Make a statemen)o(y(e m/no+h v j9khp)-ytglqr8s1pt about the direction of the velocity and acceleration as the ball is going up.

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21#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown straight up, reaches a maximum height, then fallvdlt49/v88 dd9pi hb5u; gfzgs to its initial height. Make a statemenbdtg/d8ug f h4;d98vp5zil9 v t about the 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 down ;kb*0 2lyv.9 +quwyy lt,tbgzward in the absence of air resistance. Make a statement concerning its 0t9.zyg,*wlyktu;b + 2byvlq 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 fro6j2urdwu0 *mxir mi nzv xem0:,53t f;m a high-flying plane. What is her acceleration when she she reaches terminal uuwi6 rt5x*v i0,0r dxmz:;f 2mej mn3velocity?

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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 idnu1ep7zq 7 /kpyfm.v *entical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball .znp m/f 7k*vpe1yqu7to 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 frtb *y/uozx 3r0w )ffit l9p9d2om the top of a building. One second later, ball B is dropped from the same building. As time progresses, thew fd p9y ltu*/ox2zb0)r3fi9t 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. Oneac)dah8s),k l second later, ball B is dropped from the same building. As time progresse)kcs,alh8d)a s, the difference in their speeds

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects are thrown from the top of a tall building. One is thrown up, andvxyp6. : 2y6pqipf/vh7xiqx 2c57awe the other is thrown down, both with the same initial speed. What are their speeds 6:w5p /e27pcfqqy7xhvy xia.26xv piwhen 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;jpy+kp/k(3 *w fq9v xrelnh/ the top of a building. A second brick is thrown straight down from the s/lqky/(ern fpv 3px*k+hwj9 ;ame building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two bricks.

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29#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero velocity in the q*bq3lnz 78wl:bou3x0c u;vu +x axis. The position versus time graph 7o8v:lq*bn0 ;lc3ub xwqu3uz 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 axis. The posu. b d:ezd6zjde+ f / 8:q4tjhadu;q)qitionqdz)t4u ed/u j h zqf;a6b+q:de8d:j. versus time graph of this object is

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31#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is moving with constain)6 ysejg3h(nt non-zero velocity in the +x axis. The velocity versus time graph ofsn3hy) (j6egi 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 d9m ,zr87rgcp c65dzpconstant non-zero acceleration in the +x axis. The velocity versus time grad8 gzr zc rpdc6579p,mph 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 versu(7ha m0,zl a0) vd utg:1str 0cbu-evqs 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 givest y+l+fyet x )**qhd8k

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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 accelerati,ar/7 n+:nkwszbr x k.on 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 of uc7x0l,siv gdb30;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 0. irm.pzs bk4line, the object is.4i0.pb rzksm

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38#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is a vertical lirz1w:f+qi5.7ye igsy z ,,gtlne, the object isyelw:g 1,,.z7f zrqisg+ t i5y

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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 object73bdfy:yz 0dj is a horizontal line, the object f 0:y3yzdjbd7is

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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 7i/ rcjy; ori zhp(+) 6eft,bmline making an angle of 3 yz+r7/ct jh( p rm)o6if;,bei0 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 11.0 m souti8 z88h: 38pbiaaay*j-6pcvuc1 kfal h. Find both the distance traveled and the ma -iazpafvycahbjk36 c8 1 8u8:ilp8a*gnitude of the displacement vector.

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boat can move at 30 km/h in still water. How loahqu6)v9rkn a7 -* okjng will it take to move 12 km upstream in a river flowing 6. rh a*)uvq9kk a67no-j0 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/1wm (vzmw+ ww w)o;ns1s? (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 +mvcq73f qo7hk3plv4n b5y+ u order 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 (approxihvp/ b*7awpku oa-g.2mately 42.0 km) in 2 hours and 57 min. What is the average speed of the runner inwa7vb/ huopp.a2 -g*k 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 trajz*wuv+s4u. s vel 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 dis(xb,h wgbi4 +utance that light travels in one year. The speed of l+ug w4 ibbx(,hight 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 rakja1s(r ( au.oad and you look to the side for 4.0 s, how far do you travel ajruak( a1s(.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 lomg6bmv3 ;x 7p dgua.c2op around an outdoor track (400 m), in 100 s, your average vbap7m dmc6g.uv ; gx32elocity 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 ,7h q sh4uuj70jc16 fudsa e)ysouth, 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. Whs yq h64du0jjsec 7)fua ,h7u1at 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, then 1mlc s o zri*ca:1/;:k zk56eqi.0 km east, then 1.0 km north, then 1.0 km west to return to its stara*ik1ms l 5 ccieq::/zr;o6k zting 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 migd(*wks).) f+uzg,+i,blmia 75 yldvy /yfweles. It then starts to sno/ ,+.,dw7g lkg+w fizyfyul ise)m5)(v*yadb w and you slow to 35 mi/h. 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 koc* iy s8il*yca5z*zkck9 i2 5m/h and 160 km at 100 km/h. What is the average speed of the motooc*lik525 i*zc9 i c 8yzyska*rist 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 anzkc++0ktwh 4 rd 2.0 h at 100 km/h. What is her average skr0h4wtzc+ k+peed 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 at 250 mi/h 6o,-a0d gk )yn cif3xsnorth for 750 miles. What is the average speed for the)ia3 csy, gokfnxd06- 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)s :3-g7hkb j/e en6pio 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 t/ 6es:ng- b ehpk37ojieam 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 s lyx2 y 3msjoxx*yqa+j7tq*66 rmv79otop after 10 s. The car's average velocity during deceleration was 50 km/h. oly*qxj76 7*yxy+t9omr 3s mq26a jxvWhat 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 kdmm6t,4p5ug o y5b2 fm/s to 160 m/s, at the average rate of kmy2, f6u4mp5g5obd t$15 \; m/s^2$. 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 of g llu,t9oqw qanu*a 5 6;6zw;q$2.0 \; m/s^2$. 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 accelerates at2p63g lvg c1bh)hz6mc $4.0 \; m/s^2$ 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 1 pb t 4wz8pwv2cg9ma,5 xcp1u// mbh9o0 s. It then speeds up with a constant acceleration//cp o vhu51tb9,pz pmwgb8ax2 mc w94 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 exq vrrn7q *bii0p4bl.u59 x/r lperiences a constant acceleration of q5p09 .*bur/bllrvi 4i qxn7 r$2.0 \; m/s^2$. 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 horizont ot-key6row5 2ally to the right (+x direction) with a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is the aveorek5t6ow2 y -rage 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 laun/ v/hg zl2sqkd 5/9dx;ep9qsv ched from a catapult on an aircraft carrier. It reaches a speed of h;/g/5/des2qdl ks 9qpv x9vz42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration is constant, what is the length of the catapult?

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65#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starting from rest movewr t,, c3x fyipnvr/ ozuchx,61+2ctp0q 8 mz;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 distance of 200 m. What is ipt 4 m2kbc1ubn xr u1s9js4o99ts average acceleratj14sku9r4c o2umt19pb9 sbnxion?

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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 ug,+,qx w9dbn ,cwkf1hplo).n niform acceleration. During the first second it travels 5.0 m. How far will it ,c 9q.o) 1b fwwpkg,,nhnxd+l 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 9( ayqk .12f2n ulxydxline with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10( xlnkf d9221q ayuy.x m/s. How far does it move during this time?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starts from rest and ( -gp6l 1jkh3oc*w i3qh8 v.)qd ts2 vjxy*gywaccelerates 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 roada2rds r.,hp+y can decelerate at about $5.0 \; m/s^2$ when braking. Suppose a car is initially traveling at 55 mi/h.
(a.) How much time does it take the car to stop?
(b.) What is the stopping distance?
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71#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
At the instant a traffic light turns grcb;v.+rm*5kdf . c phreen, a car that has been waiting at the intersect h.;p5 vd*c.bkfrmc+ rion starts ahead with a constant acceleration of $2.00 \; m/s^2$. At that moment a truck traveling with a constant velocity of 15.0 m/s overtakes and passes the car.
(a.) Calculate the time necessary for the car to reach the truck.
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.
(c.) Determine the speed of the car when it passes the truck.
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72#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12 m/s on the surface of planett0/ l.cn qx5yles p .ne,/k(fzmq3y;a X where the acceleration due to. qnsep mfk ;nze5/0ay3ll( ,xq .tc/y 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 s/ qk4skl**cphlqimuy+w3- e2peed of 12 m/s on the surface of planet X where the accele3yk +ik*pu qh4sl2wm -/*lceqration 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 spohh -ed7hy6nwx;t( (d(l f 9gkeed of 15 m/s on the surface of planet X where the6dy 7f9-(x;hh hko dntw gl((e acceleration 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 upwajeaxi1mk)o( 6tdp-,ka0 0 hjn rd with a speed of 14 m/s on the surface of planet X where the acceleration due to gravitya0id0(jh-kt 1xj, npa6) eomk is $3.5 \; m/s^2$. What is the speed of the object after 8.0 s?

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76#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Human reaction time is usually greater than 0.10 s. If your friend holds a ruid9,(nvl,z49 gn j kueler between your fingers and releases it without warning, how fardz,jn ng luv4(99k,e i can you expect the ruler to fall before you catch it?

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77#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown upward at a velocity of 19.6 m/s. What is2 a6pbo,3 f ih(*nepwl its velocity after 3.00 saefhp2ow* , p (i36bnl?

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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 rjc43w u 9nrd,is the initi34,nu cdr 9rwjal 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 yx )p ieis65d;speed of 36.0 m/s. How long does it take to return to its starting poin 5sy)i6; deipxt?

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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 build3ki jkz 4yhwtm 3d+,i5:zp h,jing with an initial speed of 25 m/s. It strikep+i :3,zy3 5 wkkj,hm4zihjdts the 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 a speed of 30 m/s.q/qfpoppl( *-t f6 p)v)rbfi( (only fill in numerical valuf rp)foqvtf* p((q6)-i /pplbe in 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 intrrjc.gc (*0s uo the air with a speed of 30.0 m/s. (only fill in numerical value incs(c0* rj. gru 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 ist3p hh3oam 2.gs.bpp) the velocity 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 is2 og8sala)gd2 the velocity 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 at t = 4.0 nv zad6;o(+ +49kw8ak7mmlocr a nt+es?


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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 veloc8j7 )*, mqtvgs ofnj(jcrq:l/ ity 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 3z0utte/jz8vmk a:y,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 kpeie p(y 5o 1z1pc5.ws?


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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 acuyt o-;bnvm,sesgh/ 01(8cdd celeration 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 acceleration at 3. sdhtsh: 30wcme30d9( ph( rla0 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 t j8ecqe5 vrqp-(pz(a2 o 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 accelerati+v4jyc /a3 .drwbaie. on 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 thehn)4xk aq) feltxu(0mk :s, +u displacement from 0 to 8.0 s?


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