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习题练习:Physics Unit2: Kinematics One Dimensional Motion



 作者: admin   总分: 149分  得分: _____________

答题人: 匿名未登录  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) (组内1/93) 切至整卷模式 搜藏此题  
第 1 题组 (共 93 题 103 分)
  Suppose that an object travels from one poz1r8249 /y mtqurxf5kxi r*o7c ea8fz int in space to another. Make a comparison bexftiz ckr 19am7u5ryz q/8*e8f orx42tween the displacement and the distance traveled.

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2#
 
单选题 ( 1.0 分) (组内2/93) 切至整卷模式 搜藏此题  
  When is the average velocc* q 0iey.rot+ dif*wh13os -lity of an object equal to the instantaneous velocity?

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3#
 
单选题 ( 1.0 分) (组内3/93) 切至整卷模式 搜藏此题  
  A new car manufacturer advertises that their car cx8 z17gesg v4lan go "from zero to sixty in 8 s8 gx17zg4le sv". This is a description of

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4#
 
单选题 ( 1.0 分) (组内4/93) 切至整卷模式 搜藏此题  
  An object moving in the +x axis ex 8 i4utv.l9aslperiences an acceleration of $2.0 \; m/s^2$. This means the object is

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5#
 
单选题 ( 1.0 分) (组内5/93) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the East (+x direction) begins to slow down aw7.cakt/ 5hr-kpnjs*s it approaches a traffic light. Make a statement concerning its accelerjctshark7p.- 5/ *kn wation.

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6#
 
单选题 ( 1.0 分) (组内6/93) 切至整卷模式 搜藏此题  
  Suppose that a car traveli.rka 8mjy3 ai1l9rge 0ng to the West (-x direction) begins to slow down as it approaches a traffic light. Make a sta rm8rjeai yk 0.3lg19atement concerning its acceleration.

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7#
 
单选题 ( 1.0 分) (组内7/93) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with a constant velocity. Make a statementib 0e*pwisv6q2bqt p8ebr a5w/;i8 4 i concern 8st are/qe*bbi6 qvw0;i28pi w bi4p5ing its acceleration.

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8#
 
单选题 ( 1.0 分) (组内8/93) 切至整卷模式 搜藏此题  
  If the velocity of an obje:y 1 bz;ctkfd:ct is zero, does it mean that the acceleration is zero? Support your1f: tkyz:c;bd answer with an example.

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9#
 
单选题 ( 1.0 分) (组内9/93) 切至整卷模式 搜藏此题  
  Can an object's velocit1yx qqiq,f- q0;nvcd ;y change direction when its acceleration is constant? Support your answer with an qiyqq;c,dq; -vn1 0xfexample.

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10#
 
单选题 ( 1.0 分) (组内10/93) 切至整卷模式 搜藏此题  
  Suppose that an object is moving with constant acceleration. Makh1q jcg2wa3qvy s xcj 44l:k0.e a statement conce. y40cx1 vjgc3qwq2as:k j4hlrning its motion with respect to time.

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11#
 
单选题 ( 1.0 分) (组内11/93) 切至整卷模式 搜藏此题  
  Can an object have increasing speed while its acceleration is den;fnncs3i t0:creasing? Support your answer with an exn;cs 0:3in tnfample.

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12#
 
单选题 ( 1.0 分) (组内12/93) 切至整卷模式 搜藏此题  
  Suppose a can, after an initial kick, moves up alon(f*2 oh adhus9y8ht/bq 3qnk8g a smooth hill of ice. Make a statement concerning itst h3/82bdsha qh9q(8 uf*ykon acceleration.

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13#
 
单选题 ( 1.0 分) (组内13/93) 切至整卷模式 搜藏此题  
  Under what condition is average velocity equal to the aver bicd-l5 34yvrage of the object's initial and final velociibrlc 5y43v d-ty?

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14#
 
单选题 ( 1.0 分) (组内14/93) 切至整卷模式 搜藏此题  
  Objects A and B both start at rest. They both accelerate at the same rate. 4z3e4c4m4 1e 6thabp kivi:hh However, object A accelerates for twice the time as object B. What is thembp1k44h4 e4h:i eta3 hc z6vi final speed of object A compared to that of object B?

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15#
 
单选题 ( 1.0 分) (组内15/93) 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. dwx 7f)5(yzd2pqy 4uoHowever, object A accelerates for twice the time as object B. What is the distance travey42)upd5 o(x7yq wfdzled by object A compared to that of object B?

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16#
 
单选题 ( 1.0 分) (组内16/93) 切至整卷模式 搜藏此题  
  When an object is released from rest and falls in the absence of faun (ff) )pw4jriction, which of the following is true concerning itsufa(fjw))4 p n motion?

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17#
 
单选题 ( 1.0 分) (组内17/93) 切至整卷模式 搜藏此题  
  When an object is released from rest and falls in the5r4+qr-s+*tuj ufmc qjpf 8r0 absence of friction, which of the following is true conc++qu*8m0 j st4p -rjr 5ucffrqerning its motion?

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18#
 
单选题 ( 1.0 分) (组内18/93) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. Makrnta 9go6 ) zug0kra(1e a statement about the velocity and the acceleration when the ball reaches g or9 u n1a0kgazrt()6the highest point.

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19#
 
单选题 ( 1.0 分) (组内19/93) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up. What is its acceleration just before it mbyx 6y-fje/) * nzy/mlj96fwreaches its highest poix/ye6)-fwy m zf*jl6nymbj9/nt?

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20#
 
单选题 ( 1.0 分) (组内20/93) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown straight up, reaches a maximum height, then falls bxq s 06fw;l2uqk*w .qto its initial height. Make a statemebkq qfus*.w2qw;60 xlnt 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) (组内21/93) 切至整卷模式 搜藏此题  
  A ball is thrown straight up, reaches atm:;r.5.o ag h zv8txqda;ww 2 maximum height, then falls to its initial height. Make 5a.2 g;hr:.xv;mz od wtw8 qtaa 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) (组内22/93) 切至整卷模式 搜藏此题  
  Suppose a ball is thrown downward in the absence of air resistance. Make bgmxjgu7pl8y i59u/0a statement concerning its acceilugb/ yjg9x 0p85u7m leration.

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23#
 
单选题 ( 1.0 分) (组内23/93) 切至整卷模式 搜藏此题  
  Suppose a skydiver jumps from a high-flying plane. qtns5 o8wm9ikj 6n38/o :vvrrkyt*mb 9;p+u f What is her acceleration when she she reaches terminal velocit /*+ otpwvfob 6:rk;tv3 5unnmqmys99r8 jk8iy?

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24#
 
单选题 ( 1.0 分) (组内24/93) 切至整卷模式 搜藏此题  
  A ball is thrown vertically upw5c4.plg9b 4 iuphuja9ard with a speed v. An identical second ball is thrown upward with a speed 2v (twice as fast). What is the ratio of the maximum height of the second ball to that of the first ball? (How many times higher does the suc 59.9jpalhp 4i 4bguecond ball go than the first ball?)

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25#
 
单选题 ( 1.0 分) (组内25/93) 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 dro 3 qx9bkcz53zvpye or3s5w97bbimua/ 6a2 d; tpped from the same building. As time progresses, the distance betweenodz6;xa9u m9 q5eby szpbik3532tvc bwr/73 a them

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26#
 
单选题 ( 1.0 分) (组内26/93) 切至整卷模式 搜藏此题  
  Ball A is dropped from the top of a building. One sqrrs0b qp fpuhe8n)4, :q/jjvj (1 h .+pofa.qecond later, ball B is dropped from the same building. As time p1o(:q,pbhqrp0eshn8f /pf.j .+ qa)j rv jq 4urogresses, the difference in their speeds

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27#
 
单选题 ( 1.0 分) (组内27/93) 切至整卷模式 搜藏此题  
  Two objects are throw1co)x+)ik a n97*qq-ypgeilgn from the top of a tall building. One is thrown up, and the other is thrown down, both with the same initial speed. What are their speeds when they hit thgak l+e ))*qngi97ioqy1x- pce street?

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28#
 
单选题 ( 1.0 分) (组内28/93) 切至整卷模式 搜藏此题  
  A brick is dropped from the28)pvverg / oa top of a building. A second brick is thrown straight down from the same buildin8aovv)p2 e /grg. 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) (组内29/93) 切至整卷模式 搜藏此题  
  An object is moving with cuhyvip 8;-tfh,,l (akonstant non-zero velocity in the +x axis. The position versus time graph of (u ;,i-fpkvly8,a thhthis object is

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30#
 
单选题 ( 1.0 分) (组内30/93) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero acceleration in the +x 2 (l xq/j2zxbmaxis. The position versus time graph of bz2l/(xjm 2qx this object is

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31#
 
单选题 ( 1.0 分) (组内31/93) 切至整卷模式 搜藏此题  
  An object is moving with constantoe/ 6ez+iv2 sc m6w3da non-zero velocity in the +x axis. The velocity versus time graph of this objd vsoma ee6c+63i/2zw ect is

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32#
 
单选题 ( 1.0 分) (组内32/93) 切至整卷模式 搜藏此题  
  An object is moving with constant non-zero accelerafsjy . 1d2tg1ation in the +x axis. The velocity versus time graph of thyt2jsad.fg 1 1is object is

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33#
 
单选题 ( 1.0 分) (组内33/93) 切至整卷模式 搜藏此题  
  The slope of a position versppi +tyx71(u 38qm;)ju jaoqk us time graph gives

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34#
 
单选题 ( 1.0 分) (组内34/93) 切至整卷模式 搜藏此题  
  The slope of a velocfac)pb 9)6 wx7bcrhwr,es ) (xity versus time graph gives

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35#
 
单选题 ( 1.0 分) (组内35/93) 切至整卷模式 搜藏此题  
  The area under a curve in an acceleration versu1g u5 ligx9*nks time graph gives

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36#
 
单选题 ( 1.0 分) (组内36/93) 切至整卷模式 搜藏此题  
  The area under a curve in a velocity vk 4er8q 8(d(yvd5fij n6v2 kloersus time graph gives

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37#
 
单选题 ( 1.0 分) (组内37/93) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is a horizontal linegkpl rasg08*h mx ;2/z, the object i8*2;s0a mhpkglgz r /xs

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38#
 
单选题 ( 1.0 分) (组内38/93) 切至整卷模式 搜藏此题  
  If the position versus time graph of an object is a vertical linn qkvdddwe yzzwru:3g76:l 41m/- pp2e, the object ismp21 q:pu4:e vyzkd r gwdd3lz-7 nw/6

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39#
 
单选题 ( 1.0 分) (组内39/93) 切至整卷模式 搜藏此题  
  If the velocity versus time gra8w 6 jgf78 3uqmk4gapeph of an object is a horizontal line, the object ispw jf g88megqk4u3 6a7

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40#
 
单选题 ( 1.0 分) (组内40/93) 切至整卷模式 搜藏此题  
  If the velocity versus time graph of an object is a straight line making anw *mf9a6l is+s*y pfp, angle of 30 degrees with the time axis, the object is+ls*sma,iy pwf96p* f

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41#
 
单选题 ( 1.0 分) (组内41/93) 切至整卷模式 搜藏此题  
  An object moves 15.0 m norym uk):h k-2ngth and then 11.0 m south. Find both the distance traveled and the magnitude of the hgkymu:kn 2-)displacement vector.

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42#
 
单选题 ( 1.0 分) (组内42/93) 切至整卷模式 搜藏此题  
  A boat can move at 30 km/h in still wat.uwsy8xleb. fp g03 y9er. How long will it take to move 12 km upstream in a river flowing x. yyeups0f 93bwg l.86.0 km/h?

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43#
 
单选题 ( 1.0 分) (组内43/93) 切至整卷模式 搜藏此题  
  55 mi/h is how many m/s? (1 mtjx yyn91; 7-u cm5:jedz hnhh6jm2s:i = 1609 m)

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44#
 
单选题 ( 1.0 分) (组内44/93) 切至整卷模式 搜藏此题  
  What must be your average speed inh( lays8d5tw+x19ju n order to travel 350 km in 5.15 h?

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45#
 
单选题 ( 1.0 分) (组内45/93) 切至整卷模式 搜藏此题  
  A runner ran the mar r hwpnot:6eu f3gb8.+athon (approximately 42.0 km) in 2 hours and 57 min. What is the averagr g:8+e6unh.bop3t fwe speed of the runner in m/s?

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46#
 
单选题 ( 1.0 分) (组内46/93) 切至整卷模式 搜藏此题  
  A car travels 90 km/h. How long does it take fo0*8km-ayp eu vr it to travel 400 km?

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47#
 
单选题 ( 1.0 分) (组内47/93) 切至整卷模式 搜藏此题  
  A ly (light year) is the distance that light travels i l .jcn8d5q3xsn one year. The speed of clj8.d3qxn s5 light is $3.00 \times 10^8 \; m/s$. How many miles are there in a light year? (1 mi = 1609 m, 1 yr = 365 d.)

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48#
 
单选题 ( 1.0 分) (组内48/93) 切至整卷模式 搜藏此题  
  If you are driving 72 kmjuy 0*dx q.)a v0fa4nro+ag9c/h along a straight road and you look to the side for 4.0 s, how far do you travel)n.jvyuf0gq0doaca9+*4x a r during this inattentive period?

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49#
 
单选题 ( 1.0 分) (组内49/93) 切至整卷模式 搜藏此题  
  If you run a complete loop arozw iw 8qbn6i- 0ctqpux1b j6)(und an outdoor track (400 m), in 100 s, your average velocq6n ) 6jpx1ii0b uwb qcwzt(-8ity is

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50#
 
单选题 ( 1.0 分) (组内50/93) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. Itp d/. (szkak3ug9 lvgv:*6wx e0bblr7 travels 1.0 km south, then 1.0 km east, t* xke.z9706 pka: r/wbb3vsgg (vl ludhen 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average speed?

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51#
 
单选题 ( 1.0 分) (组内51/93) 切至整卷模式 搜藏此题  
  A polar bear starts at the North Pole. It travels 1.0 k9t,sj1jw;2iev2 uk byhx.ve;m south, then 1.0 km east, then 1e22ybikj t1h.e w jx;,uv; sv9.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was the bear's average velocity?

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52#
 
单选题 ( 1.0 分) (组内52/93) 切至整卷模式 搜藏此题  
  You are driving home on a weekend from school at 55 mi/h y 7.idkuke6l o;-ej+o4r zc,ffor 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after cf iklrje4z y d;7+ ,.kou6-oedriving 4 hours and 15 minutes. How far is your hometown from school?

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53#
 
单选题 ( 1.0 分) (组内53/93) 切至整卷模式 搜藏此题  
  A motorist travels 160 km at 80 km/h and 160 k 1 a*o b-nivb:d(qidb/m at 100 km/h. What is the average speed of the motorist for this t qbd( bia di-o*b1n/v:rip?

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54#
 
单选题 ( 1.0 分) (组内54/93) 切至整卷模式 搜藏此题  
  A motorist travels for 3.0 h at 80 /-;gwly/t+ywl9l qb.i dx0 aykm/h and 2.0 h at 100 km/h. What is her average speed for the tri +yagl.tyywd /w9l0-lq ixb;/p?

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55#
 
单选题 ( 1.0 分) (组内55/93) 切至整卷模式 搜藏此题  
  An airplane travels at 30:z,3 nt.jyxczg 6k r-q0 mi/h south for 2.00 h and then at 250 mi/h north for 750 miles kjyzgxq:3 trz-n.6c, . What is the average speed for the trip?

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56#
 
单选题 ( 1.0 分) (组内56/93) 切至整卷模式 搜藏此题  
  In a 400-m relay race the anchormanl 8009yqd sk*p 8ntcgl o1ojjkow-h20 (the person who runs the last 100 m) for team A can run 100 m in 9dynk two0l 90klg 81ocq hojs-j8*p20.8 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 the team A runner not lose the race?

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57#
 
单选题 ( 1.0 分) (组内57/93) 切至整卷模式 搜藏此题  
  A car decelerates uniformly and comes to a stop after 13 s. The car's averagek/awu m79l tsgun45sx t*q ()k velocity during deceleration was 74 km/h. What was the car's deceleration while ql u7 g/t 4u)(nm5ts* xawk9skslowing down?

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58#
 
单选题 ( 1.0 分) (组内58/93) 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 average8x5r1 iy uvc7x rate of u715icvr x8xy$15 \; m/s^2$. How much time does it take for the complete increase in speed?

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59#
 
单选题 ( 1.0 分) (组内59/93) 切至整卷模式 搜藏此题  
  A car traveling 60 kmwcy6 e vk86;-j ntboh1/h 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) (组内60/93) 切至整卷模式 搜藏此题  
  A cart starts from r m f+i-lrwtz;7est 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) (组内61/93) 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 constacf kuo*ia1ppu**k-ef g5+ f6tnt acceleration opae o* tc5**k ffgpu1 6fk-ui+f $2.0 \; m/s^2$ for 15 s. At the end of this time, what is its velocity?

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62#
 
单选题 ( 1.0 分) (组内62/93) 切至整卷模式 搜藏此题  
  A cart with an initial ve ,* if6t a8orgphz/+mulocity of 2.1 m/s experiences a constant acceleration ohta8/zrig6pof*,+ u m f $2.2 \; m/s^2$. What is the cart's displacement during the first 7.1 s of its motion?

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63#
 
单选题 ( 1.0 分) (组内63/93) 切至整卷模式 搜藏此题  
  A bullet moving horizontally to the right (+x direction) with a sdoyi d /r,2c)ypeed of 243 m/s strikes a sandbag and penetrates a distance of 69.13 cm. W2 orydi,y)dc/ hat is the average acceleration, in $m/s^2$, of the bullet?

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64#
 
单选题 ( 1.0 分) (组内64/93) 切至整卷模式 搜藏此题  
  A jet fighter plane is launched from a catapul2ncyz g1g lc84azf2 5vz2bz(yt on an aircraft carrier. It reaches a 2 a1yf(yvcc zzz8z4b2g nl5g2 speed 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) (组内65/93) 切至整卷模式 搜藏此题  
  A car starting from rest bxi* d. fnqadd.0 gfdgs1 :9)tmoves 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) (组内66/93) 切至整卷模式 搜藏此题  
  A car goes from 40 m/s to 80 m/s in ahd 4gt9hkw.h 8 distance of 200 m. What is its average acceghwh94kthd 8.leration?

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67#
 
单选题 ( 1.0 分) (组内67/93) 切至整卷模式 搜藏此题  
  An object starts from rest and undergoes uniform acceleration. Dur1mfy5l fp( evz41i0h ving the first second it travels 1.4 m. How far will it ve0 1fh(iypv1l5z 4fm travel during the third second?

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68#
 
单选题 ( 1.0 分) (组内68/93) 切至整卷模式 搜藏此题  
  An object is moving in a straight line with constant acceleration. Initiall ald- :onryiv9 f) 6ytcd,:bg6y it is traveling at 1g: dnyla)ycb6:v9 t o-ifr6 ,d6 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) (组内69/93) 切至整卷模式 搜藏此题  
  A car starts from rest and accelerates uniformlyo9*+xfas ,2b)h skauxe p/c9 f 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#
 
填空题 ( 2.0 分) (组内70/93) 切至整卷模式 搜藏此题  
  A car with good tires on a dry roa :5b4mb ,gkj vodt*)lp,js3wld 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?    $s$ (only input numerical values)
(b.) What is the stopping distance?    $m$ ((only input numerical values)

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71#
 
填空题 ( 3.0 分) (组内71/93) 切至整卷模式 搜藏此题  
  At the instant a traffic light turns green, a car that has been waiting at aanj91ldbv.2aho g7w d)a .*l the intersection starts ag1 ha7ba.2ad)*n ll v.9djowahead 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.    $s$ (only fill in numerical values)
(b.) Calculate the distance beyond the traffic light that the car will pass the truck.    $m$ (only fill in numerical values)
(c.) Determine the speed of the car when it passes the truck.    $m/s$ (only fill in numerical values)

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72#
 
单选题 ( 1.0 分) (组内72/93) 切至整卷模式 搜藏此题  
  An object is thrown upward with a s l/(lk0nmxwgi)ok1;i ,ch9pn peed of 12 m/s on the surface of planet X where the acceleration i m ,wllign /;1) kn(0pc9oxkhdue 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) (组内73/93) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 17df 5oy74ovht3+xirs l: i ,g -8lwlso2 m/s on the surface of planet X where the acceleration due to +8ifloo s t4ws:dg3l7oi l-y7hrx v,5gravity 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) (组内74/93) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 15 m/s on the .9nksm8j:1ud fwfx)osurface of planet X where the accele :j9 d)mwo1k8su.n ffxration 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) (组内75/93) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speed of 14 m/s on the 9y(azmy ;ywx;surface of planet X where the acceleration due toa my;zx9w(; yy 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) (组内76/93) 切至整卷模式 搜藏此题  
  Human reaction time is usually greater than 0.10 s.gv im :wq6:h1v If your friend holds a ruler between your finge6w 1h:qg :imvvrs 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) (组内77/93) 切至整卷模式 搜藏此题  
  A ball is thrown upward at a velocity ooo4e,j vp 3izdfwlvq5 ia3;(-ia6ls /f 19.6 m/s. What is its velocity after 3.00/f,v;oi liw5pdz6io 4qe3a a 3sv(l-j s?

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78#
 
单选题 ( 1.0 分) (组内78/93) 切至整卷模式 搜藏此题  
  A bullet shot straight up returns to its starting point in 15 s. W9.6x oiwn2ivshat is the initial speed ovns6i92wox. i f the bullet?

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79#
 
单选题 ( 1.0 分) (组内79/93) 切至整卷模式 搜藏此题  
  A ball is thrown straight up with a speed,:k* (q f,qyrm ex8qva of 36.0 m/s. How long does it take to return to its stq*f,e 8q (mryqv,:akx arting point?

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80#
 
单选题 ( 1.0 分) (组内80/93) 切至整卷模式 搜藏此题  
  A ball is thrown dow (3/o uod2akqk4 x;jrknward from the top of a building with an initial speed of 18 m/s. It strikes the ground after 7.2 s. How ko/4 uoxdk(;3rqak 2j high is the building?

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81#
 
填空题 ( 3.0 分) (组内81/93) 切至整卷模式 搜藏此题  
  A ball is thrown straight up withbm:: qghj h:y: a speed of 30 m/s. (only fill in numerical valuemj:hyq: :bg:h 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 ( 6.0 分) (组内82/93) 切至整卷模式 搜藏此题  
  A foul ball is hit straight up into the air with a speed of 9g k: 9kpkxpv/2xzgv2 22.7 m/s. (use $g=10 \; m/s^2$, only fill in numerical value in the blank)
(a.) Calculate the time required for the ball to rise to its maximum height.  (数值)  $s$
(b.) Calculate the time for the ball to fall back to the height at which it was hit.  (数值)  $s$
(c.) Calculate the maximum height reached by the ball.  (数值)  $m$
(d.) Calculate the ball's speed 2 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 11 m above the point of contact between the bat and ball for the first time.  (数值)  $s$
(f.) Determine the time at which the ball pass a point 11.0 m above the point of contact a second time.  (数值)  $s$

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83#
 
单选题 ( 1.0 分) (组内83/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is the velocits. 59t8n puvemy at t = 1.0 s?


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84#
 
单选题 ( 1.0 分) (组内84/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is the velocity atch:-5;s tbtk edh; x.i t = 2.5 s?


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85#
 
单选题 ( 1.0 分) (组内85/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is the veloe65 7 zpd*g f-x7pk, mbnzme,8uzfk: rcity at t = 4.0 s?


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86#
 
单选题 ( 1.0 分) (组内86/93) 切至整卷模式 搜藏此题  
  In Fig. below, what igf2 jpd4v,qz8 n1:y4a o(g xocs the velocity at t = 5.5 s?


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87#
 
单选题 ( 1.0 分) (组内87/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is the average velo14r qz)umvan.nb 2b+ ft;cp zzlgm/8 3city from 0 to 4.0 s?


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88#
 
单选题 ( 1.0 分) (组内88/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is the average 6.u wg(g/ypyy velocity from 0 to 6.0 s?


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89#
 
单选题 ( 1.0 分) (组内89/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is the accelera dih-m9vdq3y 8tion at 1.0 s?


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90#
 
单选题 ( 1.0 分) (组内90/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is the acceleration at 3.0 s?xu 9ah)kz *th;


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91#
 
单选题 ( 1.0 分) (组内91/93) 切至整卷模式 搜藏此题  
  In Fig. below, what if;x( iag1 ay0ns the average acceleration from 0 to 5.0 s?


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92#
 
单选题 ( 1.0 分) (组内92/93) 切至整卷模式 搜藏此题  
  In Fig. below, what im1dc**k nm/tc s the average acceleration from 0 to 8.0 s?


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93#
 
单选题 ( 1.0 分) (组内93/93) 切至整卷模式 搜藏此题  
  In Fig. below, what is thewttu ;a)eh;kvi.e6ng :,k9v y displacement from 0 to 8.0 s?


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94#
 
问答题 ( 1.0 分) (组内1/46) 切至整卷模式 搜藏此题  
第 2 题组 (共 46 题 46 分)
Does a car speedometer measure speed, velocity? {speed|vxqkyr1fnfqar :er 230(6xo 7welocity}
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95#
 
判断题 ( 1.0 分) (组内2/46) 切至整卷模式 搜藏此题  
  An object can have a varying speed if ib ,)ipcqqm6x 9sqz 0 o7+m1agcts velocity is constant.

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96#
 
判断题 ( 1.0 分) (组内3/46) 切至整卷模式 搜藏此题  
  The velocity of an object can be negative when its alegl zd/.z(d:x+nm m 3cceleration is positive.

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97#
 
判断题 ( 1.0 分) (组内4/46) 切至整卷模式 搜藏此题  
  If one object has a greater speed than a second object,wfmkfu)f 748k ;4 haad the first must have a greater accew 4;ufah dfk8mf7a)k 4leration.

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98#
 
判断题 ( 1.0 分) (组内5/46) 切至整卷模式 搜藏此题  
  Two cars emerge side by side from a tunne7m;:+,cqd :ao jv+ g1 kdffuobl. Car A is traveling with a speed of $60 \; km/h$ and has an acceleration of $40 \; km/h/min$ Car B has a speed of $40 \; km/h$ and has an acceleration of $60 \; km/h/min$ . Can A will pass car B at the instant they come out of the tunnel.

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99#
 
判断题 ( 1.0 分) (组内6/46) 切至整卷模式 搜藏此题  
  An object can be increasing in speed as its acc-cq lb2 psjxzvx ,qkt809bv29eleration decreases.

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100#
 
填空题 ( 1.0 分) (组内7/46) 切至整卷模式 搜藏此题  
  A baseball player hitsp gb89kmz0k+- xu c*cd a foul ball straight up into the air. It leaves the bat wi08 b zcxg 9dmku+p-c*kth a speed of $120 \; km/h$. In the absence of air resistance, how fast will the ball be traveling when the catcher catches it?    $km/h$ (please only fill in numerical value in the blank)

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101#
 
单选题 ( 1.0 分) (组内8/46) 切至整卷模式 搜藏此题  
  As a freely falling object speeds up, what is happening to its acceleration, h 6t zhm8arn45kow does it change if a5z 6 rhtm4k8nair friction is ignored?

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102#
 
单选题 ( 1.0 分) (组内9/46) 切至整卷模式 搜藏此题  
  As a freely falling object speeds up, +7s qc/zs 3 hdt;c9mexwhat is happening to its acceleration, how doest7 s zc+s3hxcm9q;ed / it change if air friction CAN NOT be ignored?

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103#
 
单选题 ( 1.0 分) (组内10/46) 切至整卷模式 搜藏此题  
  An object that is thrown vertically upward will return to its original posobr.760hc gov- ;nuy sition with the same speed as it had initially if air resistance is negligible. If air resistance is apprec0 hu-ronoc g;7b6sv.yiable, how will this result be altered?

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104#
 
判断题 ( 1.0 分) (组内11/46) 切至整卷模式 搜藏此题  
  An object can have zero velocity and nonzero acceleration at the same time lkd2 /.t(-r5crogh5* fltzx b.

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105#
 
判断题 ( 1.0 分) (组内12/46) 切至整卷模式 搜藏此题  
  An object can have nonzero velocity and zero accelerationiaqv 3 /8x7ggg at the same time.

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106#
 
判断题 ( 1.0 分) (组内13/46) 切至整卷模式 搜藏此题  
  An elevator moving from the second floor to the fifth floor making no stops 3szt:,q ke(8h/ .1zoay,j ia:gz okxwalong t3x(ai.zhgy8ok az q1swz /j::et,,k ohe way has zero acceleration all the time.

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107#
 
填空题 ( 1.0 分) (组内14/46) 切至整卷模式 搜藏此题  
  A rolling ball moves-)c2isw /teu f from $x_1=1.7 \mathrm{~cm}$ to $x_2=-6.5 \mathrm{~cm}$ during the time from $t_1=1.0 \mathrm{~s}$ to $t_2=5.4 \mathrm{~s}$. What is its average velocity?  (数值)  $cm/s$ (only fill in numerical value please)

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108#
 
填空题 ( 1.0 分) (组内15/46) 切至整卷模式 搜藏此题  
  A particle at $t_1=-3.5 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=4.3 \mathrm{~s}$ is at $x_2=7.6 \mathrm{~cm}$. What is its average velocity?  (数值)  $cm/s$

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109#
 
填空题 ( 1.0 分) (组内16/46) 切至整卷模式 搜藏此题  
  A person jogs eight fvs+x3y pi(,pkz : mk1complete laps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 7.0 min. Calculate (a) the average speed  (数值)  $m/s$ and (b) the average velocity    $m/s$

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110#
 
填空题 ( 1.0 分) (组内17/46) 切至整卷模式 搜藏此题  
  A horse canters away from its trainer in a tybh xi6 z7),fye9 8n+ gfhjk2straight line, moving 110 m away in 12.6 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculhfk h7g)t+ f9,y 8e6y2bxnjziate (a) its average speed  (数值)  $m/s$ and (b) its average velocity  (数值)  $m/s$ for the entire trip, using “away from the trainer” as the positive direction.

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111#
 
填空题 ( 1.0 分) (组内18/46) 切至整卷模式 搜藏此题  
  A car accelerates from czzltb12.dgwd ma5 z2s,(0jym4dc. c $13 \; m/s$ to $22 \; m/s$ in 4.9 s. What was its acceleration?  (数值)  $m/s^2$ How far did it travel in this time?  (数值)  $m$ Assume constant acceleration.

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112#
 
填空题 ( 1.0 分) (组内19/46) 切至整卷模式 搜藏此题  
  A car slows down fro1m8gz al0b (wkm $16 \; m/s$ to rest in a distance of 83 m. What was its acceleration, assumed constant?  (数值)  $m/s^2$

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113#
 
填空题 ( 1.0 分) (组内20/46) 切至整卷模式 搜藏此题  
  A light plane must rn 2c *l0rgwwwk*dkf 0;kf szs :e6sx;.each a speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.5 \; m/s^2$ ?  (数值)  $m$

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114#
 
填空题 ( 1.0 分) (组内21/46) 切至整卷模式 搜藏此题  
  A world-class sprinter can burst os7 b:o(c5pzy 1py-n k+bsnd6aut of the blocks to essentially top speed aboutk 7b(5- 1 paypbz 6s+yonnc:ds $10.5 \; m/s$ in the first 14.0 m of the race. What is the average acceleration of this sprinter?  (数值)  $m/s^2$ and how long does it take her to reach that speed?  (数值)  $s$

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115#
 
填空题 ( 1.0 分) (组内22/46) 切至整卷模式 搜藏此题  
  A car slows down uniformly frx5z hhw,lo ho -zsnt+ n77c +08rb;ewkom a speed of $19 \; m/s$ to rest in 5.37 s. How far did it travel in that time?  (数值)  $m$

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116#
 
填空题 ( 1.0 分) (组内23/46) 切至整卷模式 搜藏此题  
  In coming to a stop, a car leavesh irsg 4 uh94f6:cqbi9 skid marks 92 m long on the highway. Assuming a deceleration ohbirfsq4 h9cig :49u6f $7.00 \; m/s^2$, estimate the speed of the car just before braking.    $m/s$

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117#
 
填空题 ( 1.0 分) (组内24/46) 切至整卷模式 搜藏此题  
  A car is behind a truck goph exng5eua/*hllf*h* , w 8l*ing $25 \; m/s$ on the highway. The car’s driver looks for an opportunity to pass, guessing that his car can accelerate at $1.0 \; m/s^2$. He gauges that he has to cover the 20-m length of the truck, plus 10 m clear room at the rear of the truck and 10 m more at the front of it. In the oncoming lane, he sees a car approaching, probably also traveling at $25 \; m/s$. What is the closest distance of the approaching car that he can still sately make the attempt to pass the truck? (without hitting the approaching car).    $m$

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118#
 
填空题 ( 1.0 分) (组内25/46) 切至整卷模式 搜藏此题  
  A runner hopes to complete the 10,000-m run in less than 30.0 min. After exac, l 4ncpzdzpl,jqm4lc +0.y7 mtly 27.0 min, ty ,c,l0j .n 4zzmdpplcq+4ml 7here are still 1100 m to go. The runner must then accelerate at $0.20 \; m/s^2$ for how many seconds in order to achieve the desired time?    $s$

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119#
 
填空题 ( 1.0 分) (组内26/46) 切至整卷模式 搜藏此题  
  A stone is dropped from the t3zu z2q;w8x vozq-yc -op of a cliff. It hits the ground below after $3.07 \; s$. How high is the cliff?  (数值)  $m$

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120#
 
填空题 ( 1.0 分) (组内27/46) 切至整卷模式 搜藏此题  
  Estimate (a) how long it took a stone to fall straight down from the t/ m7du.e81n bxk mry*nop of the Empire State Building (370 m high)xd m7 un1.km/*8y renb  (数值)  $s$, and (b) its velocity just before landing?  (数值)  $m/s$

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121#
 
填空题 ( 1.0 分) (组内28/46) 切至整卷模式 搜藏此题  
  A baseball is hit nearly straight upv ;6dgs on;z+c3o9 isn3 y2ywv2iis2 j into the air with a speed of $19 \; m/s$. (a) How high does it go?  (数值)  $m$ (b) How long is it in the air?  (数值)  $s$

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122#
 
填空题 ( 1.0 分) (组内29/46) 切至整卷模式 搜藏此题  
  A ballplayer catches a bafp4cdbnu f5z6t*m.;s ll 2.2 s after throwing it vertically upward. (a) With whantz *ffpmus 6;5bdc4.t speed did he throw it?  (数值)  $m/s$ and (b) what height did it reach?  (数值)  $m$

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123#
 
填空题 ( 1.0 分) (组内30/46) 切至整卷模式 搜藏此题  
  A helicopter is ascending verticarg*jla601wt ;kg:ckv lly with a speed of $5.18 \; m/s$. At a height of 100 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground?  (数值)  $s$
[Hint: The package’s initial speed equals the helicopter’s.]

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124#
 
填空题 ( 1.0 分) (组内31/46) 切至整卷模式 搜藏此题  
  A stone is thrown vertically upward with b ,n6lguuu0sjnc6p4f,wr4 n- a speed of $13 \; m/s$. (a) How fast is it moving when it reaches a height of 9.8 m?  (数值)  $m/s$ (b) How long is required to reach this height for the first time?  (数值)  $s$ (c) How long is required to reach this height for the second time?  (数值)  $s$

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125#
 
填空题 ( 1.0 分) (组内32/46) 切至整卷模式 搜藏此题  
  A falling stone takes 0.24 s :r,t1oobt.: z uiyt e+l;zum*to travel past a window 1.5 m tall. From what height above the top of the window did the stone fallt+iu l* z,u1:y to;:zrmb .ote?  (数值)  $m$


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126#
 
填空题 ( 1.0 分) (组内33/46) 切至整卷模式 搜藏此题  
  A rock is dropped from a sea cliff, and the sound of it strim g.27xp.id hnking the ocean is heard 3.2 s later. If the speed of som.2xdi.ng7p hund is $340 \; m/s$, how high is the cliff?  (数值)  $m$

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127#
 
填空题 ( 1.0 分) (组内34/46) 切至整卷模式 搜藏此题  
  A stone is thrown vertically upward with a speed s(l s*z;wzyu nt 3n.(rof $8 \; m/s$ from the edge of a cliff 34.0 m high (a) How much later does it reach the bottom of the cliff?  (数值)  $s$ (b) What is its speed just before hitting?  (数值)  $m/s$ (c) What total distance did it travel?  (数值)  $m$

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128#
 
填空题 ( 1.0 分) (组内35/46) 切至整卷模式 搜藏此题  
  A baseball is seen to pass upward bnd8x.aiv( i 9my someone on the 9th floor (28 m above the street) with amad9i .v(8inx vertical speed of $11 \; m/s$. If the ball was thrown from the street, (a) what was its initial speed?  (数值)  $m/s$ (b) what maximum altitude does it reach?  (数值)  $m$ (c) how many seconds ago was the baseball thown from the street?  (数值)  $s$ (c) In how many seconds will it reach the street again?  (数值)  $s$

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129#
 
填空题 ( 1.0 分) (组内36/46) 切至整卷模式 搜藏此题  
  The acceleration due to gravity on the pstri( .i+xt5-4a3 m7h uwexf Moon is about one-sixth what it is on Earth. If an object is thrown vertically upward on the Moon, how many times higher will it go than it w5 4pir - e.sxft+7ahtxm(ui3would on Earth, assuming the same initial velocity?    $times$

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130#
 
填空题 ( 1.0 分) (组内37/46) 切至整卷模式 搜藏此题  
  A 95-m-long train begins uniform acceleration from rest. Ti 5i(mk 2n6 u,seumh9uhe front of the train has a speed uh s(ii2,ume9umk65nof $12 \; m/s$ when it passes a railway worker who is standing 129 m from where the front of the train started. What will be the speed of the last car of the train as it passes the worker?  (数值)  $m/s$

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131#
 
填空题 ( 1.0 分) (组内38/46) 切至整卷模式 搜藏此题  
  A fugitive tries to hop on a fqn,)vp uvn+go-q+ 5 rx pmm7a+reight train traveling at a constant speed of $6.0 \; m/s$. Just as an empty box car passes him, the fugitive starts from rest and accelerates at $a=4.0 \; m/s^2$ to his maximum speed of $8.0 \; m/s$. (a) How long does it take him to catch up to the empty box car?    $s$ (b) What is the distance traveled to reach the box car?    $m$

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132#
 
填空题 ( 1.0 分) (组内39/46) 切至整卷模式 搜藏此题  
  A stone is dropped from the roof of a high building. A;5cx(n /* nnajjl.u 80 cjifyp second stone is dropped 1.47 s */anx cjj0ui8 ; jc.l5pyn nf(later. How far apart are the stones when the second one has reached a speed of $12 \; m/s$?  (数值)  $m$

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133#
 
填空题 ( 1.0 分) (组内40/46) 切至整卷模式 搜藏此题  
  A race car driver must averagz gjhsr3m,6grt.fx 94e $200 \; km/h$ over the course of a time trial lasting ten laps. If the first nine laps were done at $188 \; km/h$, what average speed must be maintained for the last lap?  (数值)  $km/h$

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134#
 
填空题 ( 1.0 分) (组内41/46) 切至整卷模式 搜藏此题  
  A rocket rises vertically, fl4:1(fvo()(a;rr6e z rjxt tisn 3gaarom rest, with an acceleration of $3.2 \; m/s^2$ until it runs out of fuel at an altitude of 1200 m. After this point, its acceleration is that of gravity, downward.
(a) What is the velocity of the rocket when it runs out of fuel?    $m/s$
(b) How long does it take to reach this point?    $s$
(c) What maximum altitude does the rocket reach?    $m$
(d) How much time (total) does it take to reach maximum altitude?    $s$
(e) With what velocity does the rocket strike the Earth?    $m/s$
(f) How long (total) is it in the air?    $s$

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135#
 
填空题 ( 1.0 分) (组内42/46) 切至整卷模式 搜藏此题  
  A stone is dropped from the roof of a build1jts*di. ,dqx ing; 1.50 s after that, a second stone is thrown sdij*t d1,. qsxtraight down with an initial speed of $25 \; m/s$ and the two stones land at the same time.
(a) How long did it take the first stone to reach the ground?  (数值)  $s$
(b) How high is the building?  (数值)  $m$
(c) What is the speed of the first stone just before it hit the ground?  (数值)  $m/s$
(d) What is the speed of the second stone just before it hit the ground?  (数值)  $m/s$

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136#
 
填空题 ( 1.0 分) (组内43/46) 切至整卷模式 搜藏此题  
  If there were no air resistance, how long h/cp,vg 8to xw7y5a4twould it take a free-falling parachutist to fall from a plane at 3337 m to an altitude of 350 m, where she will pull her ripcord? What would her speed be at 350 m? (In rea 4c5v8 7g,/ywohx ttpality, the air resistance will restrict her speed to perhaps must lower value)  (数值)  $m/s$

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137#
 
填空题 ( 1.0 分) (组内44/46) 切至整卷模式 搜藏此题  
  Bill can throw a ball vertically uz-q p/5pkp g4at a speed 1.2 times faster than Joe can. How many time5p/g- pzp quk4s higher will Bill’s ball go than Joe’s?  (数值)  $times$

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138#
 
填空题 ( 1.0 分) (组内45/46) 切至整卷模式 搜藏此题  
  You stand at the top of a cliff while your friend stands gmusnq*q9 njm fo -moj711-w8 on the ground below you. You drop 1m 8uon* 1mq7f-n9mq sjjgw -oa ball from rest and see that it takes 1.1 s for the ball to hit the ground below. Your friend then picks up the ball and throws it up to you, such that it just comes to rest in your hand. What is the speed with which your friend threw the ball?  (数值)  $m/s$

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139#
 
填空题 ( 1.0 分) (组内46/46) 切至整卷模式 搜藏此题  
  Two students are asked to find the height of a paj,w/bi8 p:usd *gkvm+rticular building. They take a stone to the roof of the building and drop it off, timing its fall. One student reports a fall time of 2.0 s, and the other, 2.3 s.jg imkb8:u*ws+p vd/ , How much difference does the difference in time make for the estimates of the building’s height?  (数值)  $m$

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