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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 spd5/2 erct;m4 q vr/nikace to another. Make a comparison between the disik; 25evcr/qn4dmtr/ placement 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 instanc fiekr03 ev7cxb .d23f5j(c ztaneous 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 zero to sixty in 96nfyxrp9n*u5.efa*ieubp b2/xo 5v 8 s". Thp9ex. /5 xu fiynefo 25n*rua*bvb 69pis 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 +xyc a9l7u gaja,m9f, (l 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 -zzh -z,p3ly( nven 8h(+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accelery n8zlehp-z, n3vzh(-ation.

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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 directv8(mz tm)kqwb9pjvy8kam5ef5 9 ) dm/ ion) begins to slow down as it approaches a traffic light. Make a statement concerning its accele9/v8 5 qwkyaet5 pmvkf )()z 98mbjdmmration.

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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 mo *i k2v.1szmjif 1/drkving with a constant velocity. Make a statement concerjf.r k1vm/izi sd *1k2ning 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 zer ;tx 3zzqz:g tqq1(ad2o, does it mean that the acceleration is zero? Support your answer withz;(z xadz2 qtqg: q31t 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 accelerati e;vk i3rh:b 7l2w0rkfon is constant? Support your answer witel3rvh;i02 r k:fwkb 7h 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 stat)frp x*f7i5,6w-mnl w ztdd 74iaqqn+y 0y5rbement concerning its motion with respect to +da7iw q5r)yl,f* m- 0t pdxrqw bi56n7fyz4ntime.

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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 (nxa fbxbri1;yu18)k acceleration is decreasing? Support your answer with an exab 1() a8xb unkifxry;1mple.

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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 k 1wl3fdj ngzq. x6a8hn9 k/w5kick, moves up along a smooth hill of ice. Make a stateme .n5kkw6 a3xjqf8dlzg /9hw n1nt 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 o 4 gb/u(t8p-dtfm bhj8bject's initial and final velocit/tbbf-4 (dhpmtg ju88y?

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14#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Objects A and B both start at rest. They both accelerate at xc9d f1n;q-1pbara y5the same rate. However, object A 1dc1 faax59 npy-rbq;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 ac0cfi9 d)./kyingcx+f/ sbu* v ib/c+ tcelerate at the same rate. However, object A accelerates for twice the time as object B. What is the distance tra)y +i9b/f 0c +vi /c*cxtd.gsi fb/unkveled 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 rest69wdkft h bni auk)(01 and falls in the absence of friction, which of the following is true concerning ii09ntf 1(kahd)wbu 6kts 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 releasedt m+ n6waz5/7ynpw;q h from rest and falls in the absence of friction, which of the following is truewn pwn hz57/a ;+tm6yq 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. lrs/l9sa cc7+dak)g5 Make a statement about the velocity and the acceleration when the ball reaches the highest point.a)7 +lcslsr5/dgka c9

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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 straigaashhvmou86 g4w4o r 6x20, ukht up. What is its acceleration just before it reach u0wuagov2o 6a8,r mk 4hs46xhes 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 /7nf r 3uz-2:* ed 1o m(fybyfbn1owtcmaximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the balf:-/n3n zytf2 mywb(udf1*cb 1 o o7erl 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 falls to its ink6zrqd 3nkf.x uy -(l:itial height. Make a statement about the direction of the velocity and acceleration as-ndr f:qkxlk y.6(zu3 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 resistanc.ki lh8.xs3 u p6c8sdte. Make a statement concerning its accelerati d8k.8ls3tpu.csh6 xion.

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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 from8ytjs+nb9b ,r ;laaw 2 a high-flying plane. What is her acceleration when she she reaches termina+;n8byrabs wta,j 29ll 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 identic4ug9vhk/)/r8venxdc g3gip ) al second ball is thrown upward with a speed 2v (twice as fast). What is t vkup 9eg/g3gv)/i)ndhc 48r xhe ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the second ball go than the first ball?)

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25#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of a building. One second later, ball B iso)px/ ;o/j+b* osi1o ufqal6z dropped from the same building. As time progreo;x/il)ojz ofo6u s*a1b p+/qsses, the distance between them

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of a building. pda- yd7w:xpeuz) ya,1/o+tn One second later, ball B is dropped from the sa+ uo -,pzn :yaydpt/dw)1x7e ame 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 tovnu.xwtx8 x (c 69yx:gp of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are :6uxyx 9nx( xg.8vc wttheir 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 20jb6 uk;-* ul0qz yw -vnzwcithrown straight down from the same building. They are released at the same time. Neglect air resistance. Compare the accelerationvn* 2 kiu-b-u y;wzjzl wc0q06s 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 velcodbz. -ia2xe.wqp 2,ocity in the +x axis. The position versus time graph of this obj2bw .xepoad.2q -czi ,ect 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-zer/e f,1qwcfr8bmv;zc7 9hdf4w: p;sb z o acceleration in the +x axis. The position vewqvwrz9; b cp78hd ffbes,z;1/fc4m: rsus 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 s6gnq ag,v6 3h8.8t0wvz);.koq csl slour0ynon-zero velocity in the +x axis. The velocity versus time graph of this object i )w06r hlys, v0ogasu8g6qvo8ct klq3 sz;n..s

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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 . act:v,qr: trws w 765-qlbx:dgby6c acceleration in the +x axis. The velocity ver tw6:g:rd6 y-w:,bvqr7bs5cct . laxqsus time graph 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 gr+a p jdq iahd 2;)ts,w02ylk7maph 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 ,uk; h y02qsorgraph 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 time graphc:4ft2o; y83l v hdarr 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 uw7dsd7j;l5*. oe o6rqxd 2yjc:upy8 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 grapc55iga i/cqgk;xl)j/x; z u/fh of an object is a horizontal line, the object i 5/ik;g j xzqiu/ga /);cxc5lfs

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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 linajb;(pb1 bn2.edq ;ede, the object isb; b e.;pj21 e(dnqadb

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39#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus time graph of an object is a horizontal lizy/tq9gnm( 1 yne, the object is /mt(z9 1ynygq

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40#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If the velocity versus time graph of an object is a straight line 2 5nkdmlxw bk)9 1m.ofmaking an angle of 30 degrees w.2b)lk1 kwx9nmo 5m fdith 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 south. f6 zyh1wu) m m*sfkah+9ln 3p1 Find both the distance traveled and the magnitude of the displacemensz9m wp1a1*flu yhhm 6)n3kf +t 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 kmabpn jl(oemat jtp6/f x* +3)./h in still water. How long will it take to move 12 km upstream in a riv e )lpopf*.6m/3a+attj xbjn( er 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 = 16v y tgkta) ak9x p9.4p-m+cxlvsmfk1j8p ; 4z809 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 spee ng8hymwzw*8/ q)mo5(q+9 q ,occugvmd in 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 (approximately 42.0 km) in 2 ho1701 dl9e(mjdw-y.z fk kgtyg urs and 57 min. What is thmy01-t y1 .kg9gzk jldwfde(7e 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 :d2 2n/g ey uu,jl6dlhdoes it take for it to travel 400 km?

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47#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ly (light year) is the distanc3 z,l wr.r3ppxe that light travels in one year. The speed of light is 3.00 x 108 m/s. How r3 xz p3p,lw.rmany miles are there in a ly? (1 mi = 1609 m, 1 yr = 365 d.)

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48#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  If you are driving 72 km/h along a straight road d ;* pednbrcd s6c)0w)and you look to the side for 4.0 s, how far do you tcpe) d n*b rds6;w)0cdravel 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 outdoo up8t /p 8fzjn.;7ddhor track (400 m), in 100 s, your average veloci8hpu zjtpdf.dn 8o/7 ;ty is

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50#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels 1.0 km south, then 1. i5 kshx26j 5*vxmel1v0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bx1j*5 vv2khmxsl 6 5ieear'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 tdfs /c fn:r*x ;*g0hfnr *x6qrhe North Pole. It travels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 kq0f:n***;r fsx r/x gcndr6fhm 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 6jq5 6:she(cf,gc*aojx xy7 non a weekend from school at 55 mi/h for 110 miles. It then starts to snow and you slow toh6f x c7o 5j:eg,cajn6 (y*xqs 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 hjp7 rue52e7fkm at 80 km/h and 160 km at 100 km/h. What is the average speed of tj 7 uh7rf25peehe 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 her .)hjaphl p w ;2bj8v)j1qk- twaverage spee.j -wj b ;pvtq2)8kw1hj)alp hd 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 th- xn r (t3eko7zym*cc5en at 250 mi/h north for 750 miles. What is the average speed frex( 37otmkzy-c n*c5or 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 runajy6-q s 9)24ahdaoqs s 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 oqhaaa29q -s)ys 6 j4dof 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;k.ey; cz9c dx 10 s. The car's average velocity during deceleration was 50 km/h. What was the car's deceleration while slowc9kz d.;yecx ;ing 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, at the ave bw aj x 5x0j6/0i.x:lkjmt)vh )kvvrd(ev0+srage rate of 5 jb mx0/hw 6)0v ijx:.vvx+k()slav krd0 etj$15 \; m/s^2$. 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 accelerat pfh1vjm)ma871u/x7r5s- ot e sxw, mjes 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 ryf.3s5l0l bfi est 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 acceleratio303 dxzmn:g nr 2lbn8 (v:usitn nt3n0n8m:z v dbr uxgis2:(3 lof $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

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62#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A cart with an initial velocity of 5.0 m/s experiences a consea7dzle /oerzo1-9otl v*q; 8tant acceleration of*l ledz zto-e8orev/ 7q9;1o a $2.0 \; m/s^2$. 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) witht178nfrrkvd0 q ;4ztl a speed of 500 m/s strikes a sandbag and penetrates a distance of 10.0 cm. What is the average acceln 70vdqrrk1z ;ttl84f eration, 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 aib bcji9m35vx)k ) 75cp7n:hdx nukij)rcraft carrier. It reaches a sp d pck n5v n5j7bxhii3ju7kx:m)9b))c eed 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 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 mmat) pxvttdp+8w 1sfm j*,cn 1a8t3-foves 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 its ave. 4 9n+bsj;f jw0u:,hwixjgzkrage acceler bj:0ijwz9;ukj+,fgsh nx4w .ation?

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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 (3gpwwy tamq+9-v+aiz )1b bb and undergoes uniform acceleration. During the first second it travels 5.0 m. How far will it trab aamg +-bww1z+y93bpiv(q t )vel 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 straighm gb)q)i20da at line with constant acceleration. Initially it is traveling at 1gaaib m)0q )2d6 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during this time?

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69#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A car starts from res q6/-)/a60quivkvhivlgow / y t and accelerates uniformly at $3.0 \; m/s^2$. A second car starts from rest 6.0 s later at the same point and accelerates uniformly at $5.0 \; m/s^2$. How long does it take the second car to overtake the first car?

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70#
 
问答题 ( 1.0 分) 切至整卷模式 搜藏此题  
A car with good tires on a kp)q;+ )snwcap+qv /:fz1oq n dry road 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 green, a car that has been waiting:skazuhlla 36b (uu50 at the int0a b5ll6 sau3:uukh z(ersection 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 upjbmi5wiui2bt f*nj.m/xf 826ward with a speed of 12 m/s on the surface of planet X where the acceleration dfiu5ibi22* j/6j t wmb8mnfx.ue to gravity is $1.5 \; m/s^2$. What is the maximum height reached by the object?

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73#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 12 m/s on the surface oy,7,w dtmv: baf)qrj8s) )blwf planet X where the acceleration due to gravil wb: vb aqrjys7)),fwt8)d,mty 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 u:n*8nz* y d v8rb.;pyf3rki otpward with a speed of 15 m/s on the surface of planet X where the acceleration due to gravit*t3*p noz vr8i bkf:y yd;n8.ry 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 dm8kx/vr63a mb*vrv(x jz lpmz0 (.l /surface of planet X where the accelera8zv x r (0b(v/k m*3x6rl dj.pv/lazmmtion 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 apao)lor r71m2h+srbmg-4h 1 greater than 0.10 s. If your friend holds a ruler between your fingers and releases it without warning, how far hoh1p7m+balm2-g 4srrr )1o a 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 is its velocity an2zws+g ac-9ldj7 /+ l.yjof ifter 3/g7-j .cajys+zdl w lo9 fi2n+.00 s?

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78#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A bullet shot straight up returns 46*d(cni aody to its starting point in 10 s. What is the initia*i 6cay4dod n(l 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 speedmm 6;c ts1 f uohx6f757bdeyj, of 36.0 m/s. How long does it take to return to its startt7hbmu7 5fc6xjeoyms6, ; 1d fing point?

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80#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A ball is thrown downward from the top of a building with an gx ikttb-s8otf(:nk sz y1r k ;u0.q80initial speed of 25 m/s. It strikes the ground after 2.0 s. Htot (t s8sybr0ki1x8kfg zk ;.qn:0u- ow 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 straigiavh(g,3h- dtk-y+ gi ht up with a speed of 30 m/s. (only fill in numerical valgkhd h-i-y+ tagiv3( ,ue 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 into the air with a speedw2+ qio592,by2i7zg lzl wzii of 30.0 m/s. (only fill in numerical value in the blyzq li+5zwz 2iw ib92lgi72,o ank)
(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 veloci gbfx8- mxju w7,u7y93zax u*qty 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 veloc ztfm)n/*h)p absh(e+ ity 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 t6qu7t )5uphxz: zm +da,ft8sc he velocity 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 t = )kiw s(i,g3x zfm1t rv,.g7ud5.5 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 e (:ml 0tr.7fbyxje;hfrom 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 averagmb d ;m :a+ovlmexfqw; 6elw/;/*bzo1e velocity from 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 acqrc8s(nt8a./6nsn, l u .mjblceleration 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 accelerati5 5qhm vtfo) m7n9hyo+tm4ln0 on 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 tcrzwl v xv89 zc2l+5(3nbq ht*he average acceleration 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 uv3mmwr y1 3lb(:og e,7lh1heacceleration 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 toqm0nj)i 6 i.gf 8.0 s?


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