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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 pointgo *x+vdynt *r9 h8vy6 in space to another. Make a comparison between the displacemh 9 * 6xnotvg+dy8yvr*ent 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 obja oya;z.a jgq, * fxv4e-b94(pchz.eiect equal to the instantaneous velocity?

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3#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A new car manufacture :ksm9v q (/,lkkaxynlk3t9 w2r advertises that their car can go "from zero to sixty in 8 s". This is a descriptionk nk(9kaks /3y2mllv,:wx 9qt 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 uww xr q*bl k0t2rk4-26 7eudj+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 to the Ea-pg. 2ggi*)p)wajdcjst (+x direction) begins to slow down as it approaches a traffic light. Make a statement concerning its accelerat g-2p*i).wpgca g)jjdion.

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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 direction) begins to slow do83 xs)tdcaxotm s9 h/3wn as it approaches a traffic light. Make a statement concernhx 3som3)/sxca98 dtting 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 aqkw.+c p)j0 oswby h98 statement concerning its acc 9)8wco0k.+hy pqjsbweleration.

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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 thjcc:u p8t:2eqq 0zd0wry) / gbe acceleration is zero? Support your ad)pw qcqzb:0 e8 gr02yu/:jctnswer with an example.

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9#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Can an object's velocity change directionoewz zl8 1k3ze ;7v4sn when its acceleration is constant? Suszo;z4 w8z3le ve7kn1 pport your answer with 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 2 .e4;dyoc fewrf*d;nconstant acceleration. Make a statement concerning its motio*fcee2oy;r n4w f.;ddn 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 is decret3xia(9tvpm;gf; d i9asing? Suppo9x( im;3piv f9t;atgdrt your 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 initial kick, moves up along a sm/ycpnwj kzgy(+p*ly /0t )g2nooth hill of ice. Make a statewctjn/)yypg l* z(ky 2pg0+/nment 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 wmo:q +fo/8j+vl ryd, velocity equal to the average of the object's initia q rw dmv+lf+yo:o/8,jl and 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 bothbo* a+ .l50kwu2 (4stavkhf4oki 3drm accelerate at the same rate. However, object ltm 2adkuo 04 a *sw5r+ oh.b4v3ikk(fA 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 ac-t ,kws 90*z6xk4 ib,yamvmq icelerate at the same rate. However, object A accelerates for twice the time as object B. What is the dii yi,mzk*0asv6 qw -4tkm, x9bstance 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 rug+y+d/gf1i w box-h:l* lg b8est and falls in the absence of friction, which ofibg 1o*d gxly/b+:glhu+-w8 f the 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 61lwi n0bcao)xx9k2n from rest and falls in the absence of friction, which of the )n bac90 w1ix6k lnx2ofollowing 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 about the velocityz-:mwkz, /fd p and the acceleration when the ball reaches the highest poi,:zwkm d/-fz pnt.

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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 acceleratio ;jz*1k-3dvve(jlcm1 i*ziv kn just before it rvk mkvi-1z v1l*;ejz (* 3idcjeaches 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, reybk 3jfbu6yftq x852ok( o-2maches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the ball iy 8o2f2 kqxjf m3kybuto5 -(6bs 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 mae; vmf,hoe9e7m7 bknwz 9s(s:ximum height, then falls to its initialsemksn (eh ;f99vmezo, 7:w 7b height. 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 downward in the absence of air resistance. Make a state1 84khgnzc.usivfr4frw * 4u3+0 dueoment concerning its acceleration.ufe4in*su.+4r4wo v u cdf3 1rh8z0gk

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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 hig,w,, b/bk6ubidkcffrb:v 23 q h-flying plane. What is her acceleration when she she reaches terminalbc ff,k3bi wr:6k/b bvd,q2,u 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 identi:o,.bmf nzhp;gr/etn7wv 55b cal second ball is thrown upward with a speed 2v (twice as fast). What is the ratio/mfpv5n , b5:g;zr hwo n7ebt. 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. Onxtl2pv8lt(5. oqoun6 e second later, ball B is dropped from the same building. As time progresses, the distance be(t oql.n8o txu2p56vltween them

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26#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of a building. One second later, 6fwq0rk1;efp ball B is dropped from the same building. As time progrefqfkw;0re6 p1 sses, 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. w23+ :vwu)u*g mrssfkOne is thrown up, and the other is thrown down, both with the same initial 2g3 m srvuwf*+wu: )skspeed. What are their speeds when they hit the street?

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28#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A brick is dropped from the top o9zeoq7 y,j5 ywp;d ro(f a building. A second brick is thrown straight down from the same building. They are released at the same time. Neglect aire dw,5jy(zoor y7qp;9 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 nomx. zjmoi34g-j xa+ h4p64zgfn-zero velocity in the +x axis. The position versus time graph of this obj- 4+3.gm ghjif4p6 ax4zzjxmoect 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 wjw5 z0zvyu7*axis. The position*v0 5jzzw7wy u 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 constant non-zero velocity in the +x axis. The veamw ;4n d53yqtk 4tw8olocity versus time graph of this objewq o5;t84y a34kwtm ndct 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 *ik kpb*q 5(u;2+fg, ufcueat in the +x axis. The velogqf;*ub +tep5kufi a 2uk(c*,city versus 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 vers;dzja4 0*j, /ei vpl(rboqb4 -s 1crwzus 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 ti3yqw co :)qy6yme graph gives

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35#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  The area under a curve in an acceleration versus time graph givef5rq 4 e4p 0vspsrfw5o5z() ies

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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 verc i x*9bsiq9s1sus 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 lh2ajknd:i1mm y8x 6 *dine, the object is i 2 x6danh1:dymj*8km

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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 vehj * gxvz jzec-a mnx+8/-4,airtical line, the object iszij* -,m-n 8e4 xghacj+/vx za

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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 p(qgl8 ejshwcu1 ( 3h:an object is a horizontal line, the object 3c8phw(jq:u ( gs1lehis

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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 ;49q hdy s)adzis a straight line making an angle of 30 degrees with the time axis, the obqds4h )z9a; dyject 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 the5y-n+kji+ cny n 11.0 m south. Find both the distance traveled and t+k-5cnj+ in yyhe magnitude 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 long j 8jg1puhl0cs .sg*j (n3qj-rwill it take to move 12 km upstul.n* jjs3 j-h ( r8sjpcgq10gream 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 = 16t; m5/fst9mfq09 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 t,w4)y l2fxbb j6/avyr ravel 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 hours and 5ljwdh2 e/3th4/k jj; t7 min. What is the average speed of the runner in mktj /h 2j/4 jeldwh;t3/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 lo n vn7e,war2q8fmo.x2q205 lra8 yytlng does 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 distance that light travels in one y);d,j)e f yt-q,dn fsyear. The speed of light is 3.00 x 108 m/s. How many miles are there in ) j-ndtydsf e ,)f,;qya 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 and you ka ;8c0lw1ql+i22 o.qg cz.n bomh*aulook to the side for 4.0 s, how far do you travel during this inattentiv1mia*l0z.2knw g; 8hl.+aobcqc 2 q uoe 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 ot l79 u;ajgs( kybu(b+ ,fx*fn hf)8aan outdoor track (400 m), in 100 s, your average vebu+g7aft(9l ,kh8 fs*b (j) y;ua fnoxlocity 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.ol j:inoga /3*0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its startii* o/ag: loj3nng point. This trip takes 45 min. What was the bear's average speed?

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51#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels 1dp-cr; yhej)2.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return td -jpy2ec)h; ro 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 weeoj.l chq c8;k;1q;it0,a tw zkkend from school at 55 mi/h for 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hours and 15 minutes. How far is your hometo1k ;zwtoctc; ,qq hai0 8.ljk;wn 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 km/h and 160 km at 4zpr8s -yb0n6gcs /ncq9fw z8100 km/h. What is the average speed of the motorist zyw s 689-gfzq b4/spnc0ncr8for 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 heofkvf070if 1xkuu9jl w)56pcb/ic,, c ds.gar average speed for the 7pc 0o0 9v ,c usiil)kw6gf.a/5xbdc fu1jk,ftrip?

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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 fort-itp 5bqx;jam) 4 j/ daap,6.a0rxjm 2.00 h and then at 250 mi/h north for 750 miles. What ) aax4ajdrimbpt; 05/6x.,jq-j atmp is the average 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 s -c n;gip9b4,rdrys xujt(8z5u lb*1person 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 thrn8z-uj5r csxs (dg4*biu,y9b l; 1tpe 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 af1eful9stcnbj;m:g;itm;hw 8- s3bc) ter 10 s. The car's average velocity during dececntmbe9lt);ws;f 3-sbch :;18i mg juleration was 50 km/h. What was the car's deceleration while slowing down?

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58#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  An airplane increases its speed from 100 m/s to 160 m/s, at the average rn+(sxpb+j*r rhq:n z+ate of pz* +bshq( xr+:+jnnr$15 \; m/s^2$. 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 a,- q h;xs9tm*zjzi5 tvgn, 8x$2.0 \; m/s^2$. 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 accele* vshdj :q9;z).ff iabrates 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 witxl+;q;n0 1s-hmz m inoh a constant accelerationn0-+nmzs ;li; mx1qh o 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 experiences a constant acceleration ak0+0 voh,1sxd g sg6qog gv00so1q+6a,x ks hdf $2.0 \; m/s^2$. 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 oo8 8n.)nu0j1 mxhzkkx f 500 m/s strikes a 1o x )k.jz8xhumnn8k 0sandbag 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 on an aircraf(k50j );3ms7h nm q bzsnt)ppkt carrier. It reaches a speed of 42 m/s at the end of the catapult, and this requires 2.0 s. Assuming the acceleration( j3p n0t)7bp5nkq sz;mmk) hs 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 couk37rgbd7 tk xc (xfw8gej /66nstant 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 averax 1nc/ne32hrkge accelerakh 3nrex/nc2 1tion?

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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 accelm3 ris5 :maif0eration. During the first second it travels 5.0 m. How far will it travel during the third s50ms:f ariim 3econd?

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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 lineo d,t,3 f4lt) dnc4z +iueg7dk with constant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does iktt+d, 3iz4u74)og ndd e,fc lt 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 uy902 sgb 8*hbjz (mjefniformly 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 al771l,j-h ucj gk92byx-sl co +xsi s-bout $5.0 \; m/s^2$ 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 turn+qe 8gqb*pq192tc pzwr3zai3/dy+wr s green, a car that has been waiting at the intersection starts ahead with a z9zpy irqa21++dw*b33 8cqgq /r tw epconstant 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 onwrkkz+f hw3 --s,suva8 5qr5y the surface of planet X where the acceleratiovw+uwf,y ks a -85k-hq 53rszrn due 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 spq(;qy wi,20chgi:rg keed of 12 m/s on the surface of planet X where the acceleration due to grav cq2;g,h r 0(kyii:gqwity 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 surftbx wg+q1j*h,cv244m0 cvhc aace of planet X where the acceleration due to grav jqahhvwcvctx4m 1 cb+,20g*4 ity 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 su1z .ik-q,(+uqtmg 2 yvgpxsy 7rface of planet X where the acceleration due - u(t+1y7k2xp.qqms igvz,gyto 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 greater than 0.10 s. If your friend hqo78h sq a6+e p:*ifduumk(n,olds a ruler between your fingers and releases it without warning, how far c8 7ehiud f mq6(s:* poa+qkn,uan 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 veld6es0ux/ yd 1vocity after 3xvd1uey/ 0d s6.00 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 to its starting point inh;pco;la8: cm 10 s. What is the initial speed of the bulo;h cmac:lp8 ;let?

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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 do8k g vrq::9edy06d n zt5s;djaes it take to rqs:5gnv;9yd: zkd8tea drj 06eturn to 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 building withu6.n uf 6omfv;,d9l sc an initial speed of 25 m/s. It strikesdmfn6s,6 .9 u;vl fouc 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/ag1j *j./ q8t oxdtvg a)q/ xm1w0dj,hpg86rts. (only fill in numerical value in tp . o/dm 0r /hjgtgj*q)tjg1xa,v8xqta6wd81 he 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 of 30.0 m/s. (oyjg 5g1; lj*cbnly fill in numeric5gclgy *j1 ;bjal 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 = 1.0 s? o s*tz*cvlk4q/i cw--


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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 = vc 4i+r 04 m0zvkdc9ilv6ko9wvo6 vh72.5 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 velekf 23jun:. wpocity 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 theiovx 5g2j5k7d mun v1/ velocity at t = 5.5 s?


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87#
 
单选题 ( 1.0 分) 切至整卷模式 搜藏此题  
  In Fig. 2-1, what is the average velocity from z93m9)*6 c8 o n uq5yorekxmag0 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 velocizcot0hen3 7 ppmr872u8 sxyu) ty 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 acceler9 )wjplfzsqv kk z6)63ation 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 3bjb3 ;lt:nuct0 :rz q/.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 frbfv 5rr p4zt/q;cd2mqyhn/ 8(om 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 acc4 la 9zcmk8x)beleration 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 ctzt; , xt3mgo(7z.i5afcz)w to 8.0 s?


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