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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 point in space to another. Make f12n32ecd gc(kzmao ( a comparison between the displacement and the distance trakz dfcn2ae o(m1g 23(cveled.

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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 velocity of an object eq8(ronymmp 5o.ual 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 5rb: h3o t350ymglcjs advertises that their car can go "from zero to sixty in 8 s". This 3hr 0yl535ocb smtj :gis 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 experiences 2, yz p/umj17amoh ao2an 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 directioltz8c5pe+vixlh / ky3hw 4a 9, qlk+4an) begins to slow down as it approaches a traf89/v3 , z a5hp4t e+4ckwilqa+ylkhx lfic light. Make a statement concerning its acceleration.

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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 travelihg; d* ./fv dxekyjvjyj0bhn )tyf14h(un8:)ng to the West (-x direction) begins to slow down as it approaches a traffic light. Make a s1x;y.d yg k v0f j)n/*hhy8ju4djfth:)b(v entatement 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 statementj66 y7onhvz qom.+4 7zb6k pyn concerning its acceozn4 y v +qk667 6p.jnozmh7byleration.

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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 obje4kmh9x- yrr-jesb1p, ct is zero, does it mean that the acceleration is zero? Support your answer with an example. 4,mb9py-h -jkrexs1r

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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 velocity change -6i q gvuyl 9*p0:xjgkdirection when its acceleration is constant? Support your answi pg*-j9xk:q u6 lyv0ger with an example.

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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. Make a statem dqi8/ t.d5ggds v).pnent concerning its motion with respect ntdg .dgd.v5is/ p)8q 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 decreasing4sr1uz5bfntn olnk f; ,.k+h 9? Support your answer withu,nf.f 9bh4n5 n ;1zrlto ksk+ an example.

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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 al-e+k *lvc 4j6fp vtj6yong a smooth hill of ice. Make a statevly +kp-jc 4*6jf t6vement concerning its 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 average of the object's g )- lp sdjxu5o.dh16 o--jbiwinitial and final velocitjpj xib.-sogl -du 156dh)ow-y?

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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 ratebhq3lqx sqp:+ xk1*0kl96 pff . However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of obj * s1pbpxk+k06l9h3xqq:q ffl ect 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 samj:/j62+s fr+ bsknl; 8 s3rl1yueev nse rate. However, object A + 1 sleyl j:rnr8f 2sebn63+;vu/ ssjkaccelerates for twice the time as object B. What is the distance traveled 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 tmnix:p8b 0a3and falls in the absence of friction, which of thex: mb an8tp3i0 following is true concerning its 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 relea m9c,fh8 7uonlrbdnsr1.j9 *xsed from rest and falls in the absence of friction, which of the following is true concerning its motx lms *8n. r, 79rnjhdfcu91boion?

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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.kv(tia+ w g5pkm/.e u. Make a statement about the velocity and the acceleratm 5kkave.p. tuw+(/i gion when the ball reaches the 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 justqfup7pf+ h3 h3 before it reaches its pf7puf3q +h3h highest point?

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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, reach ijh66:c; xieyes a maximum height, then falls to its initial height. Make a statement abo:66icy hie;xjut 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 a maximum height, then falls to itsap y+. tes9epyj 0fvm5ob:; 2(e5 vuqe initial height. Make a statement about thae(9v0q; eej+:pumf5 po 2 eybt5 .vyse 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 abz nkcs:87g *bksence of air resistance. Make a statemekz 8nb *c:g7ksnt concerning its acceleration.

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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 fr8d ay2zsul :xrhg8 //com a high-flying plane. What is her acceleration when she she reaches terminal velocity?g: zdhc/r8u2 lx 8/say

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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 upward with a speed v. tmsw4re7 .xlk(7 :s(/lhl bcbAn 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 secos7tlb4 mcwrk.s7h/ elbxl:((nd 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 builddz ir98h s8m:fing. One second later, ball B is dropped from the sammihzf89: sd8r e building. As time progresses, the distance between 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 second later, ai)v0 g rgo/7xball B is dropped from the same building. As time progaiv/r )o0 gx7gresses, 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 thrown from the top of a tall builivlbrays.m3 k/7 h,1zg . :zwuding. One is thrown up, and the,3szh. 7a uv :wkg.lmzbry1i/ other is thrown down, both with the same initial speed. What are their speeds when they hit the 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 the top of a building. A second brx bzcsa .qj9r,d+)e +vick is thrown straight down from the same building. They are re)c djv9,+szxae q.br +leased 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 constant non-ve y i;w5zr,1dmerv, zg+ gx)-zero velocity in the +x axis. The position versus time g wi1 y,-+ r5d,x;)vee grzmzvgraph of this 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 accelerats 3f 3c,4lzz9j( klviuion in the +x axis. The position versus time graph of this 3f9szj,l klcz3 (uvi4object 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 constant non-zero velb +,ja)fwbc1ft- c4snocity in the +x axis. The velocity versus time graph of tnc)+j4 a fbbc-,1tfs whis object 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 acceleration in the +x axis. Thfchn+ 5q(;x6/o0x qtce 1wpmae velocity versus time graph of this objecn ;cwt0f e cxpq+5 o/a6q(1hxmt 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 versub3p -;ocm*l 4q :udrvds 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 velocity versus time yl +7 c8met+nvjb+i o/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 versus tih xd+wj563iy0np 4*j4 ncr zuume 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 f gseopu*mdo9,z2t 64velocity versus 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 ofyg5vae2(not6c 7g5 ew +q:w gf an object is a horizontal line, the object 5 52veg+ a6g q g(wnto:cywf7eis

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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 ( mfgddv zjdhm(,)6 6;p.fjzb jg0aq 4time graph of an object is a vertical line, the object is 6pvj0m jgm g((, )ahjzf;.6d4fd zqbd

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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 graph of a r ekzfb .fu5*xu/(x;xv pr)x(n object is a horizontal line, the object x;xr/v. b (*e kr5xffuz) u(xpis

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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 linec;txia4 mq-vq 9ay6 8rg9pd 7e making an angle of 38 ;axt9-qy7 ma pi6qd9r4gv ce0 degrees with the time axis, the object is

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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 north and then 1c .igsnw br-lk(e0 8f-wo w0g71.0 m south. Find both the distance traveled and the magnitude of the displa.wlei rgos0n7c0(f kw wb8-g- cement 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 water. How long will it take to mo 41pgo o/c0wnyve 12 km upstream in a river flowing 0ncoyow/41p g6.0 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 mi = 160.a)zkmo8kokuvbb e. 9; qz92k9 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 sh:x e menl4g ikpbff.juok/ ;9y3-7+ fpeed in 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 marathon (approximately 42.0 km) in 2 hours and 57 min. What a,aha:s hoj92 is the average speed of the runner in m/a 9s ah:2oa,jhs?

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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 for it to travn4yjkpu/;j rrt02e s *el 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 tng6,ueu4 y 1*q+kywvcravels in one year. The speed of light is kwc4y+*16v uyuqe,g n $3.00 \times 10^8 \; m/s$. 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 km/h along a strfv 2q.*q8. j3i cyekwxaight road and you look to the side for 4.0 s, how f *ky qf3ixw2.ec8.j qvar do you travel 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 around an outdonf6z0a9kxs e0 or track (400 m), in 100 s, your averagef9 0 n0sxke6az velocity 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. It travels 1.0 km south, ke-fu isyp31ml4op ytdexu89d1, iu-g4; /vq then 1.0 km east, then 1.0 km north, then 1.0 km9g 4o xdtp,3- 1uysei;v4 -8/imuqd1lk fpuye 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 tr gzy,2.-vk l8rrhueb:nrvq f7;8dwj2 avels 1.0 km south, then 1.0 km east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. What was th8bl v:eru2-,yr.wj;r f8qgv d2k7n zhe 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 ; z6- tissdf)wfrom 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. Ho-;fdtz)6s swi w 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 km a 1 es7kfi+b,htt 100 km/h. What is the average speed of thi 17 b+ftehsk,e motorist for this trip?

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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 km/h and 2.0 skqb2hc(;za 4pn, 9 4xhpc)( 6qz1m-zc b waprh at 100 km/h. What is her average speed fo,z zcmw)pa1c44z- rb9qaxb qph2;s6np k(hc (r the trip?

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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 300 mi/h south for 2.00 h and then at 2x (k,+zs,xc uq50 mi/h north for 750 miles. What is the average spe,ckzu x (,xs+qed 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 anchorman (the person who runsam5agy+ 8a:w 5 lq;*ncim k4xj the last 100 m) for team A can run 100 m in 9.8 s. His rival, the anchorman fo q5l8a k4:ij cam*wx;g+ yan5mr 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 9 s. The car's averar pvtbqiewv)6(j 4qwi8, ::odge velocity during deceleration wovqdqv,pw ti:4w r (i86)je b:as 65 km/h. What was the car's deceleration while slowing 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.9paa y..x xjz s) bf3oy2*ryo from 100 m/s to 160 m/s, at the average rate of 2 j yx3*9. p.as)borayofx. yz$15 \; m/s^2$. 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 km/h accelerates at the rate of t,xpw)d4y6/ hrhv 6ee $2.0 \; m/s^2$. 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 rest and accelerates atd;v;xkqi.5y z:r+n vi.s(cpt $4.0 \; m/s^2$ 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 2cbn o71 e(whz .z/x.h y*wfrdkh2w4vspeeds up with a constant acceleration of(.yhe2xhfcb/zn14vhzd .*w2 wo k7 wr $2.0 \; m/s^2$ 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 velocity of 5.52)4j vxf,fy;ufo x5cz m/s experiences a constant acceleration of ,ucj25v yffx) 4ozf;x $4.8 \; m/s^2$. What is the cart's displacement during the first 9.3 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 spee cn8 lp2fsy*e:d of 311 m/s strikes a sandbag and penn*p:y 28lec sfetrates a distance of 11.92 cm. What 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 catapdaenw)6av92c ult on an aircraft carrier. It reaches a2cw)d n6ve aa9 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 moves3 bshk ix/ykpd ;3l+:d 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 a distance of 200 m. What is its r+(y(ppt:z fzuk:e ( haverage acceleration? :+zfkp(:t((u ype zrh

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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 accelerat gb )ke aek56(f9pd;cii, (xiqion. During the first second it travels 4. e(,iid9 kq(;)agp x5bckfi6 e8 m. How far will it 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 accelerati,at kk t01j70es gh7zeon. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How far does it move during tej0k zg 7s,h0a1ket 7this 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 am2ys9nmcxg. 6nd 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#
 
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 road can decelerate at amk:lh1ec1fl7 q+e: iowrq o 8e1-5r onbout $5.0 \; m/s^2$ 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 beenr7(;bz jto)hn/db cx; gu m6m4 waiting at the intersection starts ahead with a con6 dj4;u7 mzmn /xb;)b h(trogcstant 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 speed of 12 m/s on the surfac)fixscjjho27(gm +2immqh0 5 e of planet X where the acceleration due to gravs )j jhmh im+qcf(2 57omxi2g0ity 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 12 m/s on the surface of. rgo2loig6 .v planet X where the acceleration due g2o .r6ogv.il to gravity is $1.5 \; m/s^2$. How long does it take for the object to reach the maximum height?

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74#
 
单选题 ( 1.0 分) (组内74/93) 切至整卷模式 搜藏此题  
  An object is thrown upward with a speen/ :3pqp11wpcpekmw: 2phhg.d of 15 m/s on the surface of planet X where the acceleration due tpqp1geh.p: mc2n/pw1 pwkh :3o 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 upwaap-8.-z vk 3)6bvs addez hqqm0lb8s:rd with a speed of 14 m/s on the surface of planet X where z8vdb a k60qqbzd:s.vs ) l3epa--m8hthe acceleration 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) (组内76/93) 切至整卷模式 搜藏此题  
  Human reaction time is usually greater than 0.10 s. If your friozzf5qtppg57sj a*s.-0; fmg end holds a ruler between your fingers and releases it without warning, how far can you expect the ruler to fall befo*7fofz .jgsmp sagz5;-tq5 p0re 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 of 19.6 m/s. What is itsb jh;tp8ovw0,iwpo ;f 4kkn/; velocity after 3.k4; j8bk ;f,hiv pon/pw;ot0w00 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 7 s. What is tdm+ 7 k-cfl.ybhe initial speed ofl bckdm+7.-y 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 of 36.0 m/s. How long wd(wwl01ln5 mjl 8l2g does it take toj (2mll5wn 1w8wl0dlg return to its starting 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 downward from the top of a bro ryki 9d52h 14c yvd-8f8exdjdn(3uuilding with an initial speed of 19 m/s. It stvd -8 3cj1rnyu 8xo2 yirfkde(5hd49drikes the ground after 2.6 s. How 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 with a speed of 30 m/s.gqhg hl85)j pq*z6k9t (only fill in numerical value in thz* hh 6qtgq8g59p klj)e 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 wir:9n7zud q2fhso9 ky x7.ixt(th a speed of 20.7 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 1 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 14 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 14.0 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 )f0 (l gd* rafiv rn hg),bp-qz:m-mn-is the velocity 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 velocitf xyf3i1xbcd/6 awx y;8y.s9ay at 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 xish u: 4d,.0be-6mvx k) dvo6mvzbv+is the velocity 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 is the velocity ant8: 8v iemwn6t 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 velocity from 0 toblwd 9fnd *rag ,l79osrhb90 qr17gs: 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 velocity froy4rsdqim23wc z) vd- /m 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 acceleratio(6- qybklh5bce910.mqirm h z n 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 as y4f(yo2e* kck1q q.occeleration at 3.0 s?


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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 is the average acceleration from 0 to 50dxccl*jeg0 q: 4w )zd49n zss.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 is the a44que xh h0y od:t5a5twh y2o-+pn(gfverage 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 the displacement from 0 to 8. n q5y,j9nk+wl0 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? {speeke;rr d6 m5/qed|velocity}
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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 varg- lrpkifvu4t)w.p4. ying speed if its 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 acceleration is positlt;b8 v5* rxnuive.

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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, the first must havp5j:4gb 7kqo ve a greateo:jq kbvgp57 4r acceleration.

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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 tunnel. Car A is t8a*3hba5 jr:i fpn1bx raveling 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 acceleratd: 3pezyjgzl))d7 a4ai mrt)zykiuo(**j33 oion 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 hits a foul ball straight up into the air. It lz5oad(uykl3l a*0t 7+s/9y)qie ckc leaves the bat withq5 yzceu +3ly0 ld(ati sk7)k/c* 9loa 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 h wr wb5b2sls81qu9x49e bj2dpappening to its acceleration, how does it change if air frictiw15esdxrb bj 9q9 482wp su2lbon 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, what iznp; b c5t/7yb6tj s*is happening to its acceleration, how cnp/j t;6s7t5z* b ibydoes 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 0+hul ivot2l.wxa 29 wwill return to its original position with the same speed as it had initially if air resistance is negligible. If air resistance is appreciable, how will this result uhi0l9 oxwav 22.wlt+ 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 z3y;qr ztd :iko8 9/dptime.

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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 v kv;j6 y ge.3eg3woj:rmst7/ k8w5mb uelocity and zero acceleration 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 seconoccj wo3a2 2rvn,62wsd floor to the fifth floor making no stops along t6cvow aw2j3, 22 scornhe 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 frkok(bfrh + jy,7e9kv;om $x_1=3.4 \mathrm{~cm}$ to $x_2=-7.1 \mathrm{~cm}$ during the time from $t_1=0.9 \mathrm{~s}$ to $t_2=6.0 \mathrm{~s}$. 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 $t_1=-2.3 \mathrm{~s}$ is at $x_1=2.9 \mathrm{~cm}$ and at $t_2=4.4 \mathrm{~s}$ is at $x_2=7.8 \mathrm{~cm}$. 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 complete l-:r5:fe;-snj8wkghu mr ph0aaps around a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 8.0 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 straight line, movl p cw.3 cvogg,nb )ls:g7.zvk j0+f3iing 110 m away in 13.7 s. It then turns abruptly and gallops halfway back in 4.7 s. Calculate (a) its average. ,)gvgnb0 7ljls+3 c ifvck3go wz:p. 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 fro wky; v4twsawo 5vzv9va;3r,*m $10 \; m/s$ to $24 \; m/s$ in 5.8 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 fro up( ft,3:fpcnm $18 \; m/s$ to rest in a distance of 71 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 r oro4;+ai;bzgeach a speed of $32 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.3 \; m/s^2$ ?  (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 b;e3)ti+vzjqmm ;h z)purst out of the blocks to essentially top speed abouh piz )3z;tv;)m +mqjet $10.2 \; m/s$ in the first 13.6 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 frm;pyvss pg/ olx ,:*y3om a speed of $20 \; m/s$ to rest in 5.80 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 leaves skid marks 92 m long on th8idm+ omrg+gxv65s ;qe highway. Assuming a deceleratio5m+;o6v+gs 8qr gmi xdn of $7.00 \; m/s^2$, 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 going ofnbk+j)uh1- k+ bh 5kfx x8jph0s.rza*+ w1u $25 \; m/s$ 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 0d y8zgsz0 ku r2i-ic*less than 30.0 min. After exactly 27.0 min, there are still 1100 m to go. The runner must then acceleratszi 0-z20icyd g8k *rue 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 top of a cliff. It hits the ground below aftern0 e cfxv ul wk+0tqcd. x,6-8ht,wlr. $2.81 \; s$. 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 straighb o0tb0i pga;(t down from the top of the Empire State 0 0(bgopi tba;Building (374 m high)  (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 straig o(d2fe phuz*k:dxh n is6; bg-df*+k8ht up into the air with a speed of $18 \; m/s$. (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 ball 2.4 s after throwing it vertically-vzqp)j oq xad3b*a 8rp5,aou8r3xs( upward. (a) With whaqab rux)o3odajr -qpp 5(838zvas,* xt 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 vert06qr2s2pp n 2xuzwav:i 5v*ud ically with a speed of $5.02 \; m/s$. At a height of 119 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 upwa 9 .z. vkbi v7z(nd8jmwg0dke*,uzr10tdk lr2rd with a speed of $14 \; m/s$. (a) How fast is it moving when it reaches a height of 8.2 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 0.11 s to travel past a window n )chdu8hncaf:q.sv- *m2ma31.2 m tall. From what height above the top of the wivmh q)cahncsnf- :.d3m*8a2undow did the stone fall?  (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 strie8w,n-7o bu .*vyh +a ft qliq)gqw85lking the ocean is heard 2.3 s l b7 y llvqq8hitg+.w u8o*n-)e awf5q,ater. If the speed of sound 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 h h6 (3zcbvaov 5k f540omery:of $10 \; m/s$ from the edge of a cliff 55.0 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 by someone on the 9th floor (28 m ao xswqv 3-,sy-m*c/nfbove the street) with a vertical speed*v /y3qf--c osnsxwm, of $8 \; m/s$. 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 Moon is about one-sixth what it; l,3,d+e sh e4qpibmy is on Earth. If an object is thrown vertica ee bm4i,;qy+dh ls3,plly upward on the Moon, how many times higher will it go than it would 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. The r /vj1/,gst bosh 6+nqfront of the train has ,/qg6+rvb nt1o hs/jsa speed of $17 \; m/s$ 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 freighrr hw*j31 r 850ufxyms. tb5dgt 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 fromvghpdx3751-p f6 nlr i ,5hjunl)3qt w the roof of a high building. A second stone is dropped 1.39 snqihdvun3)-753lw6tp ,p f1hr jg x 5l 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 avemeuwzj0 j+c/zqb-2/54ss7n ue*to wfrage $200 \; km/h$ over the course of a time trial lasting ten laps. If the first nine laps were done at $198 \; km/h$, 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 verticallmzi2o a7 l9gwj9-pwoyeo+c ,6 +(nbojy, from 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 r3hmun(n;0lu building; 1.29 s after that, a second stone is thro 0 hnmlu(n;3ruwn straight 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 resiz bj+4do*mbox2 4vi8 vstance, how long would it take a free-falling parachutist to fall from a plane at 3996 m to an altitud2j4ivvo+ m zod*8xbb4e of 350 m, where she will pull her ripcord? What would her speed be at 350 m? (In reality, 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 at a speed 1.4 times faster in h(nf lu,g-:than Joe can. How many times higher wug(, n:in f-hlill 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 o*gc z55cmzww1n the ground below you. You drop a 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 jusc wz51wg*c5zm t 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 fing(r,ug8lla7++e ml sn d the height of a particular 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, 2.2 s. How much difference do(7eln,marug +s8lg l+es the difference in time make for the estimates of the building’s height?  (数值)  $m$

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