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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 4nur;n z41l amg(uf) w0zu- 8g 9fjjtwpoint in space to another. Make a comparison between the displacement a nz4tw94;0)g- gn f1u 8umzjwf (jarlund 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 toqxwrf4av s1( *jx8dwn5 .j n3t 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 0bb6 l52,vmrlp.r mx jcar can go "from zero to sixty in 86p50. mb blxrjm2vl r, 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 +xn,44iykfl 6 uqgaoz7kbk8o:. 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) begins t607gxn d8is-qe l fvt u2c(lb c 3n44/gqzk4uyo slow down as it approaches a tr 4nq l4z/7 udc-i2k80nstlebg 4g cyxquf36(vaffic light. 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 the West (-x diredi )3 /zo,svm:/ vkaxiction) begins to slow down as it appriks ai d:)3m,v/ oxvz/oaches 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 ,adcv/o8* g/k.dxd1it vdyu 0is moving with a constant velocity. Make a statement concerning its acceyot,/ku/*0did d1vax. c v d8gleration.

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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 acceh /r qg05a-zikleration is zero? Support your answek/h rzgai0 q5-r 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 chan3 wulbq;0tdt/6zxb 5tge direction when its acceleration is constant? Support your answer l w 5tbt 6dt;uqb0x/3zwith an 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 constant acceleration. Make a k94mgo9p8xr5 as 6mni statement cog96a np8m5mo4sirx9kncerning 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 acceleration)) xls jsp/:o/o c bd(uew(dr, is decreasing? Support youl/,jrws(c)spo b ud de:)ox/(r answer with an example.

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12#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a can, after an iningzvvlr u6.x)1+j.v-f 9hux4k er-uo w) p7vntial kick, moves up along a smooth hill of ice. Make a statement concerning its acceleratif16n 7juvo v9x zw lxrg.)- uvu)rp+ h-4vk.neon.

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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 um/f(, nzovmi koge0 6g2d4+l the object's initial a v4mo u6le g+mi(0 ko/2gn,dzfnd 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 acceleratew)tv :v70kryt at the same rate. However, object A accelerates for twice the time as object B. What is the rt7): kvty vw0final 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 q y4k t,l:3dlx pv,aw3rest. They both accelerate at the same rate. However, object A accelerates for twice the time as object B. What is ttq xa,p33:kydw ll4v,he 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 j/ xs k;8,htpwabsence of friction, which of thes/t;kwp h8, jx following 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 in the absence of fri l dff60v9ksa/ca; q*w)lkpu+ction, which of the following is cf kvaa*s dfl0)pw9;+u 6qk/ltrue 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 strailnx bm*8jt yy*21ln-gght up. Make a statement about the velocity and the acceleration when the ball reaches the highest p*yxml-nj8nl12tg *yb oint.

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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 bv (0rh:c dulh,wt ,zxwb8m)aiq,i b/5efore it reaches its highe5 xu,:)z/cqb h md ,t,(0walvbirwhi 8st point?

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20#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up, reaches a maximum height, then falls trwo i0c4 wb;k5vep-yg8ky ,k /o its initial height. Make a statement about the direction of the velocit y e;crw4w,b5g y0i-kkvpo /8ky 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 h)q sq0-( g +gcxer b9ix3ftk/seight, then falls to its initial height.fq-r/tg9s cbig(qe)x0 k3s+ x Make a statement 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 daii /8c1ap 4hxownward in the absence of air resistance. Make a statement concernin 1ixp h4iac8/ag 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 from a high-flying plane. What i7 w:+ v -qsdhvbezmn9kf+vxsp)o --x +s her acceleration when she she reaches termq -7e+ms:)nhb+z-+9xwsvpx v ko -dfvinal 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 second balltr2co,ks9 3 im8wd-yhug ,e(w is thrown upward with a speed 2v (twice as fast). What is the ratio muh,wo8-kws d g 29,te (ci3ryof 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 drotaz5md8 / ygqb/ffi+;f2; skepped from theti f;f/baf5edgmq;/8ks + yz2 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 buildil 0,oiolq/ i5ing. One second later, ball B is dropped from the same lo/q5 ioi0il ,building. As time progresses, the difference in their speeds

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27#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Two objects are thrown from the top of a tallimif4gro0;jvgl 6-:ss8 did 2 building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when theim-64gd;s 8 iiglds:j20vf ory 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 thrown s, ms)r6oxxhjq6;nr erq2:-z htraight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerations of the two br )6n,eq;xh-2x sjmzrqr6hor : icks.

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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 +pe3k gb 46e-jxx axis. The position versus time grapxgb p6eej -43kh 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 t4)szi2o6lns se u qu/,wm zq)7he +x axis. The position versus time q2e s7/oz)squszuw) n64, imlgraph 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 vq rvpf-ea *-d2elocity in the +x axis. The velocity versus time graph fvp- qd- er2*aof 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 non-zero acceleration in the +x axis. yg;eftr8 y 8m* The velocity versus time graph of this obemy 8g*;rfty8 ject 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 grapuz57 sbmc.p-g v8/zt0gco s( uh 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 gd1gqua 4f7wry x)prt,0 q/7d lraph 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) 2(ga 7hcsrikipe q0f(s; k3y acceleration 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 gij* m a9mv6 5zgp9pbc,eves

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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 gre; s4n 9yo:styaph of an object is a horizontal line, the object :4sy;9seoyn t is

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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 objeg vim3icezj*; jagenh/7h50( ct is a vertical line, the object isa0gi/jvcem(j 7zih;3 e 5*ghn

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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 grac0gjp :+e rjbr(0z .y)x1puh mph of an object is a horizontal line, the object i +j)crb01u.(y :xghzr jep pm0s

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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 t99 jfz0(vt6xf:bhxq an object is a straight line making an angle of 30 degrees with the time axis, the objexb9(0qhzvf:j9 t fx t6ct 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 y53jqr.0 +f/dlsworr l1j dl611.0 m south. Find both the distance traveled and the magnitude of thwqr 0ld1f j/sl5+6d r3lyj .ore displacement vector.

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42#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A boat can move at 30 km/h in still water. How long will it take to move 1+s6pyre+wr em :8e dh:2 km upstrearw8 ehs:rem:+y6 d pe+m 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 mi =u)q5 q4g h 6nbxnx g-m4e+eqt( 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 to travel 350 km sd7zc j ldz36*gr1mwk9*4vul794v wc u9gvsw 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,h3azwzg 4y4 g) in 2 hours and 57 min. What is the average speed of the runner in may hz g,z3w4g4/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 trakiabp)i5x: t3vel 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 sp(-kz gk;xks)+l sck a.eed of light is 3g.+sxzckl)-k a s(k k;.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 kr-u*4u equ;jagt0a- i m/h along a straight road and you look to the side for 4.0 ; -gqi0juaa4-*utur es, how far do you travel during this inattentive period?

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49#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you run a complete loop around an outdoor track (400 m), in 100 s, your 0nl;) n .u vecl d 8l*y7p)v/wxuajg(maverage veloci /w )dypvn.xl)gluc08 *uj ve7ln(a; mty 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 Nor.dvgu3wqkz l vvm. 525th Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip tau5vlmgqk2 v v .z5d.3wkes 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, thr6tv.w* bxtd //w3nl o7tar4 uen 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting p/w4tuwr 6 td.txnr 3/v*lao b7oint. 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 miles. r3sj6z9 xchls,r:5m v q :e6op 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 v3lsqr j 6,rm6s 9c5::xhzeopyour 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 1vi/cixz9- cjdm .n37w60 km at 80 km/h and 160 km at 100 km/h. What is the average speed97win /xm- 3zvjcid. c 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/h and 2.0 h at 100 km/h. What is w 45. ps7 : d+izztqvmhzjv53dher average wp5 zdzis3qm.7jh z dv4t5+v: 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(wnn* a84qpsdt j -t;p mi/h south for 2.00 h and then at 250 mi/h north for 750 miles. What is the average8np j;td wt-q* sn(ap4 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 aglv5l0m8n6bbumr - 7f8 f)ry3mz-as 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 that tnmarmlm5v0zy8a)l- 68g sr 3u-fbb7 fhe 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 wavu5:deq .cu+ i,2jps. The car's average velocity during deceleration was 50 km/h. What waud5 u2iw ,q vj+ca.ep:s 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.c 6-.nkg ,fd1::oyb7j mc xoybs:hvi 100 m/s to 160 m/s, at the average rate of .m7io .:ynj:1bb-y hco6fcd v:g,s k x$15 \; m/s^2$. 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 42ekm:visat( accelerates 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 rest and accelep9m bl1.mw, q4jro kr3ptus+,rates 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 with17r :ha+gid6at)a yt-e) uw,wz kikj6 a constant acceleration ia: gwyzjt , iu)hw6a6ke7 1ak+)d-trof $2.0 \; m/s^2$ 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 experience5i2pceci3d)c 3)qxy/yqgpp)9d m;o 5 x ixd b3s a constant acceleration ooq5pc5xg;ydd3p2)/y e33qc 9) xmdxcpi bii) f $2.0 \; m/s^2$. What is the cart's displacement during the first 6.0 s of its motion?

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63#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet moving horizontally to the right (+x direction) with a speed of 500 m ;4j1+wfeplw c go(h(r/s strikes a;+( o1l fwrec wj(hg4p 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 genu08 xyq( +5j zqs2son an aircraft carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s+5x0uqnje(qsys zg28 . 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 ra)m m0lz 0h4loest moves 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 2jcr .pp:v kfw25 +z*jekm +bc)00 m. What is its average accelerationkjp5+k fz2j:)+vpr m.bc w *ec?

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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 firsyf1jqk. ve:x. etuu- 4may,v6t second it travels 5.0 m. How farve.,xyj quy-4.k fv aet:m61u 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. sj qtkhs3aco07c4 d:)nq48d c Initially it is traveling at 16 m/s. Three seconds later it is traveling atst84caq :sk)d 3 dco0qh 4cnj7 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 and accelerates uz7av:6lq42mom ls o i9niformly 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 about 6q 5a26r/w4kjgmo gr nq/mh w+$5.0 \; m/s^2$ 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 likjp9+)p hrhw6d2i( wl8(c aj tght turns green, a car that has been waiting at the intersection starts ahead with a constant acceleration of 9r6 (hh(clw)j 2pa8i w+kpjtd $2.00 \; m/s^2$. 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 1xf+uw sa jj/-12 m/s on the surface of planet X where the acceleration due to gj-s/j+a1xfu w ravity 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 5fcs)v :g5acwa speed of 12 m/s on the surface of planet X where the accecgc5as v)5wf :leration 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 spe,yfb v9l 8zqi2ed of 15 m/s on the surface of planet X where the acceleration duiz98ql2bvf ,y e 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 of565u8e0xcnbv0-fvjxc jic z / planet X where the acceji0zb c0 / 5fux8 nxc5jv-6vecleration 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 usually gri::2/b ;j xs+nx;gf0aifz3rx,tnzg geater than 0.10 s. If your friend holds a ruler 3aiijsg :,tz gf;xrg bfx nxz:/0+2n;between your fingers and releases it without warning, how far 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 veloidu07.q cj 4dfc66eh mcity of 19.6 m/s. What is its velocity after 3.00 muhfd04c6qdj7.eic6 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 isop/b.h ql5t/qo z8v ;y the initb8.yl5/tq ohzvo; p/qial 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 36.0 m/s. How long does it tac vjbd-8qex0)dsx *2 hke to return to its st8 )0d-2xc jd xveqhsb*arting 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 o/jrw;zi9e h*y j) s5sff a building with an initial speed of 25 m/s. It strikes the ground after 2.0 s. How high f;/wj* 5zjy9r ie)h ssis 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. (only fill/bdlf++boq 1 tim4 d:+rn5z yv4qn;wb in numerical value in the blan 45nv1t4 z+b +dqqrl+oim;/:yfdbnw bks)
(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 ofkmi ftf8*7up3 30.0 m/s. (only fill in numerical value in fu7k* mtpi8f3 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)fx;b:r-ze m u 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 is the velocity at t = 2.5 s?5frih0li tzz6ec)54.ic g yru bj( 3.06yvtnz


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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 g.z qd23ud2 javelocity 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 at tuql:of0,.3cvjzjg)1 ei bpx0 = 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 1 r 4wzo73nbjaza+ mv+)u8ooj 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 t p3dzq 34l*7qrvd l259mfbfd 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 acceleration at 1.0 s p*b2:gonct9bukun 3+?


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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 accelerall kg/3ug+hz; 7 /fqolc q7d*ttion 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 s?x/i nklv/x)7o q.w2r,suzs7w


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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 s? dm 3xqguyvzg 31c),bo)ta-1o


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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 displacementz6q;ny rjysonc93. g tyz45 6x from 0 to 8.0 s?


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