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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 aj. rn +riuq(w 8rt6m.v comparison between the displacement and the distance . wj+.8m v6rtrrqi (nutraveled.

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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 equal to the instantaneous qhp2nmt:tgl ,lx48e ao+ 0tz4velocity?

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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 can go "from zero to sixty kgvuml2 nxf (x*; r8g0in 8 s". This is a descripf vnxg 8ml(kr*20xgu ;tion 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 kcntxirm4 ,(d;2b ,(t xsrvd4the +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) (组内5/93) 切至整卷模式 搜藏此题  
  Suppose that a car traveling to the Ebp) w9yw,tuawk-e9 ; qw1t ap:ast (+x direction) begins to slow down as it approaches a traffic tk9p;a:)w p1, uaeqy9wt- wwblight. 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 traveling9kpdb 6 terr+vnem ()).,karv to the West (-x direction) begins to slow down as it approaches a traffic light. M.)ed (m9e +br)k rnt,p kvv6raake a statement 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. Ma,ou+ssrak 1*pzjlzb)2iyd8 5ke a statement concejb kdz)1,y 8rsa+ u5zsipl2o*rning 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 object is zero, does it mean that the acceleration is zec7edi,zn xlr o08v hsyw/ 30(zro? Support your answer withxce ov0d i,zlwy3 h(0/7nr8z s 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 velocity change direction when its acceleratith wci:ii ;.,yon is constant? Support yoiw: ,t.i y;cihur answer 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 ih;i)co25k4ho rsu z kwqd9(d 4m b2x9ds moving with constant acceleration. Make a statement concerning its motion with 5hq44 2w zokih cbs9d du2r(xk);9domrespect 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 accelerchc p zt- 83bo8:cuh.mation is decreasing? Support your answer with ah bc:cphtm 3zoc-.u88n 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, mv56 jt w2vmz/2ln4*mqzsr7 jqoves up along a smooth hill of ice. Make a statement concerning its acceleration.mjnq7*s5zv4/6 r2vml 2zqw tj

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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 thro7 7 lae.vd2pdzfg:13qfo4xlx l n)/e average of the object's initial and final velocit7rn:a4lvl1). /qf po2 fdozlxg xd73ey?

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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 thmc,a7:)tt ;c kq1xzgue same rate. However, object A accelerates for twice the time as object B. What is the final speed of object A compared to that of objec,1cx)tka ;t:mug z7c qt 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 rathpg:*b 4q ,oroe. However, object A accelerates for twice the time as object B. What is the distance traveled by object A compared to that q pohr:b*4,goof 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 friction, whichw zfx6e 4r:qyu h:+cj+ of the following is true con j+ 4rwu:xe :yq+z6fhccerning 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 released from rest and falls in the absence of friction, )erm-ruw. ca)which of the following is true concerning. -r)am)crw ue 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. Make a tf)gkt9e *1 fl statement about the velocity and the acceleration when the ball reaches the highe9gkelft ) f*1tst 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 isbx0h0ijek u4+ pe-g /ts acceleration just before it reaches its highest uxp/sj eegk b+4h-0 0ipoint?

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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 thr))p uj9ugn2rgu 578u9 ogi fefxh 05idown straight up, reaches a maximum height, then falls to its initial height. Make a statement about the direction of the velocity and acceleration as the baghnj9g p fii8)5uduregu052 of 7u9)xll 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 mzxp(; 8j 7f e1rfpdtnli+ 0pd.aximum height, then falls to its initial height. Make a statement about the direction of th(d ef p p0z x1fild+nt;7j8rp.e 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.*,r j.day2gu)b: gf owhi u13w Make a statemen y*ub2rou3a)hj: dif1 .gg ww,t 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 from a high-flying planeii :)drx7 dl2pa*6 lpl. What is her acceleration when she she reaches r*l)2d:i x7ipladp6lterminal velocity?

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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 vertim/8 u -;9hchmgg y;cpically upward 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 secy;8/cpgugmmc- 9 i;hh ond 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) (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, bahzq yl wk3 9te.b+9og+ll B is dropped from the samegzt39k+.h ylq +ob e9w 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 frjc11 k lbm(:gh quy;a.j* ,ybjakh /*com the top of a building. One second later, ball B is dropped from the saca bbh*, j;cl:a / hkj.g11umq(y jy*kme building. As time progresses, 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 f2r8 c.b2sjf 7hhp nigd ,tuwm.11 *lmzrom the top of a tall building. One is thrown up, and the other is thrown down, both with the same initi*in1.. 1jt,g2u2m7hhf l w8zrsmbcpd al 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 buildinwgv3aks) s-81 hu ti6dg. A second brick is thrown straight down from the same building. They are released at the same time. Neglect air s 8ud6kv-1 iswt)h 3agresistance. 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-zero velocity in the +x axis. Thqxr);us wbjp )l0 :tp4e position versus time graph of this objeu)s)jxpplqb t:r;w40ct 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 axi izul znqsf5 i5yb3457s. The position versus time graph of this 5uizqn4 y5i75b lfz s3object 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 velocity in the +x axis. 2sxdf /.f9aca:ww:r n The velocity versus time gra:w/sr: cxafa9d.nf2 w ph of this 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 c;.vvr67qyx6itv v6 z g7rg1m the +x axis. The veloci vtcg v 6vqg;r67.7yr mvxzi61ty versus time graph of this 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 versus time grapht: 4que67qnd z d7;iyx 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 vers2 . x:p fn2tef5csgqr 2z.-iub 8brcj-us 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 acceleratibtvz,zt 0c zk8svb)1 16rva 0gon versus 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 versus try .c- *ck8a8 yecvhb1ime 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 line,busu *gxz o(o29n jaa;r,yi20 2 rjod: the object i9gj:u;zu 0r jon*x, aros diba2o y2(2s

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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 line, the objecta*abgchq)( of+ot,-bvv 5pl 7 is) -pbo vtoh7 +bfa(a *qclvg5,

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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 an object is a horiznabn3+7d /t he.0a ) msmw8tpza: stm2ontal line, the object a:/e8tspsm 3db7nz0h.+ nm )t2aw t mais

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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 maki5g(8 oqlv l*eang an angle of 30 degrees with o5q *gl(ae 8vlthe 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 11.0 m - gl-s9 pmwm.esouth. Find both the distance traveled and the magnitude9p mm sl-w.-ge of the 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 5/zx 8cjk(2y/)p)gliw6nta 0 usg dlw still water. How long will it take to move 12 km upstream in agi/l2 gwd lyn 8x 0j(a )tz)cs/5k6upw river flowing 6.0 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 ysx q pt4+z5o y4eu7k*mi = 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 in order to travel 350 km in 5.15 h?8 q5 cc/ni9wkv

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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)e6 gls6(fs4v xaslwd9-qn;(f in 2 hours and 57 min. What is the af lqal(nwsge6;d f 9xss(4 6v-verage 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 itxf +myxrs s* j8lwsz93e0k sm; mz4*+ tt:+bie take for 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 in one yeadg7fhh-7+bt m:w)i xwr. The speed of lw: t)7wbmf-hxdgih+ 7 ight 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 km/h along a straight road and you look to the side for 4 9z *x6f-)ebvf3+m8fot +v6xkub ytxl .0 s, how far do you travebf6+ -o+6bxztu) 3vx 9f 8*x kfmtelyvl 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 outdoor track (400 m), *ff zo07d8d b vti82ozin 100 s, your average veloci8*0d7ot2iz zbv of d8fty 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, then 1.0 km 5elhh r( gtlp /o12 pi-d-uea+east, then 1.0 km north, then 1.0 km west to return to its starting point. This trip takes 45 min. eohda-2 hr p1/up5+- tliegl( 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 km south, then 1.0 km v:6w9pxxzm,/x oj/ wleast, thevpx,:w x9wxzmj/ 6/ oln 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 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 foe/piyw.w y24sr 110 miles. It then starts to snow and you slow to 35 mi/h. You arrive home after driving 4 hou/pyw2s4i.ew yrs 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 80gc(eot)2tlgh k ui:09 49j6 avl vdkj; km/h and 160 km at 100 km/h. What is the average speed of the motorist ck 9lvead4j :2lo)tgh ;6g (90 iktjuvfor 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 a eg,knko vg80n-68sma t 80 km/h and 2.0 h at 100 km/h. What is her average spe-8g g s8k 0vkeo6nn,maed for 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 250 mi/h nortq-v) 7visrqs* yu;h9c h for 750 miles. What 9v) ;ruyqh 7c-sqsvi* 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 anchorman (the person who runs the last 100 m) for 8y 8o*+fuv6 aiy*aksbw:de+6 lgl zn.team A can run 100 m in 9.8 s. His rival, the anchormko8bw+ ne8y * 6svyz*ldfaa u:+lig.6an 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. Thef n-6 5+ewdik y4z/lsm car's average velocity during dmk/ wydnie+zfs46 5 l-eceleration was 34 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 xg(e4te;m( )vtau(gmpug ru:d)y 1+hfrom 100 m/s to 160 m/s, at the average rate of ; m(uu( ) hmag)(geyeurvdp + xg:t41t$15 \; m/s^2$. 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 acceleratesd nt9u 5gkd goc,ie:7.b5 syc1 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 rest and accbu+;uacc0 qc w8u;0lj5j9 ho jelerates 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 constant acceleratio vx )8:8f e (g6xc0qhfgwik+oun x0f (fu e6 w8h+):ogkvqc8xg iof $2.0 \; m/s^2$ 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 ofmkmbt2+0s+y big*q f7 5rsp,s 7.1 m/s experiences a constant acceleration osb 0s,mpm+7 ytiq2 *bg+ fsrk5f $4.2 \; m/s^2$. What is the cart's displacement during the first 7.7 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 rot*(nlj h j0kg67hd(87kkvbto the right (+x direction) with a speed of 496 m/s st7kd(lkg jvb8rhtn 0 6j(okh*7rikes a sandbag and penetrates a distance of 53.12 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 catapult on an aircrar c/swd8 f,s84+ejvmift carrier. It reaches a 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 catar4c8 jis/d+s8m ,wefvpult?

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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 m g)vvk*js 6*byoves 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 80tlkm/-)ppf *y/rsn i.5e :ptc m/s in a distance of 200 m. What is its average accele-*.)eyt m:rkncs 5i/ppp tfl/ration?

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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 unpnqqj+aa : ac k0r/)m/7nk9a ldergoes uniform acceleration. During the first second it travels 8.1 0+ aja c 7nnrkq/)p/l:kmaq9 am. 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 conse vznb(5bdsxh os/ 2,8rdk,r2 tant acceleration. Initially it is traveling at 16 m/s. Three seconds later it is traveling at 10 m/s. How 2x82bz(dsh ,/,d nv korbser5 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 accelerag6xd 364c/, fliisxyltes 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 deceler)aa -*wha8 n/pfl:oh0zef*0mhlckc( ate 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 lig, jegnz 90p tf6*wpiv3g,1pijp3ox x2ht turns green, a car that has been waiting at the intersection starts ahex,13eo2 wtpijf0jv pi g6n,p9 *3zp gxad 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 upwa5s,* :q8fko .bfdu(j g rt;wkyrd with a speed of 12 m/s on the surface of planet X where t; oyj s.k , dqftf85krw:*bgu(he acceleration 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) (组内73/93) 切至整卷模式 搜藏此题  
  An object is thrown upward dd+tyv hw0r-b pq1s ,x,6 d, y6:ipk 6rqz*vhtwith a speed of 12 m/s on the surface of planet X where the acceleration due to gravq t i+br:pxwz, * 6pt61dvry,6d -,v0hykhsq dity 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 m8:; xn7. rmf*4qdk4e6g pjiz)u r scur/s on the surface of planet X where the acceleration due to graviz4 d8 r:;rc kpfg46jr e*mxiqn7 su)u.ty 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 surface of planet X wgt/r-4 ge b6m9mknp;ez m34jvhere the acceleration 4 e 4nj9erm k6t/p;3ggvb-mzmdue 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 thb(3pmp re* if9an 0.10 s. If your friend holds a ruler between your fingers anp3(9*fm bepri d 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 of 19.6 m/s. What is itsq;b(; d w +bmk-juatp9 velocity after 3.00 dqt;b9w( ;kpb-mj + aus?

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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 straigh3j ig u,bdczu b+n2/qc4(y5 wat up returns to its starting point in 4 s. What is the initial speed of the bulli+/wg aq, c53bcdju4 z2 u(nbyet?

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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 does it take hhd0rgdg/ pjvj* ;8jwu r2z -7wlu76fq vh1c2to return1 8gg7juvc2 6j7/fwwhh ; hzd-rp0vuqr j*2ld 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 building with an initial speed uens 3z2ugzp;6to6 /cof 12 m/s. uz6/zup6 ;ot2 ns3gec It strikes the ground after 4.4 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. (only fill in numedim,dictkesf ,u0;hzy-s 169fkfn l 5u1g3i-rical value in the gi,l3cfe1k5y6 uidt hf0s- ,9u -f ;z nksimd1blanks)
(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 (y)x9ct fux d0 (4jcxy(nik0 ye.z7s nair with a speed of 34.2 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 3 seconds later.  (数值)  $m/s$
(e.) Determine the time at which the ball pass a point 10 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 10.0 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 veij6a r79ckr.k28iil *anipx 567pkbglocity 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 at t = 2.5)0go33eixf t4nfe9nu 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 velocity at t = 4.0 s?2tub7pc6s(sps, +4t6pv h zyl;mujzk .4 rht6


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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 p:lbs:xj1j( /1ff0vn3 rki fu 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 velocity o3l 5 1s,c3,is7jdqu crkba9 ofrom 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 velocity prii z -6lzhog(ti 8d;;j .7ccfrom 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 theg3o o(9oc +sj (ug/0eljg .zfq acceleration 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 yuu6krj ;1 l,)oyrjj/ 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 5.0 s? f7b g-zn5h3zf


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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 average accelerxu6gw0p6ch;mllfpe )32 hj / sation 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 displacemenz 6u1 jsnme1( bvr1,rz57y6ouyrr ,ao t 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, velk 8y1mt31obbeocity? {speed|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 varying speed if its velocity is c f -ntwy5l+c1aonstant.

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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 neqf8a *pk;sn)vg 2r mz(gative when its acceleration 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 speed1 of.j7aoyc 6x than a second object, the first must have a greatera6 7o1x .cyofj 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 gn+ew2e /rtvc- xu9p7 k.zcw1side from a tunnel. 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 flvkrbku 6be2+l t+le:+8 6ewacceleration 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 leaves the bat w y.pwxyyy26,/ gg a5s6nxzy ac3j4-uwith a speed of pas.u2 yx3 y-g4x/5gw j6 anwyyyz,c6$120 \; km/h$. 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* 826ex glzx fzias9j.v4k z3s is happening to its acceleration, how doez*z 9fkesx jia 8.sx4g23vz6 ls it change if air 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, what is ha;nksz(sxw o/ 8ppening to its acceleration, how does it change if air friction CAN NOT be ignorn 8(sskw xo;z/ed?

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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 vertica 4o6qve0 wg*lf7+fzzmlly upward will return to its original position with the same speed as it had initially if air resistance is negligible. I+*06zfwm f qz7olv4 gef air resistance is appreciable, 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 tim;c +*c0 xpcuuze.

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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 anjvkm9((tq9 ej qu-cj0,g ds6nd 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 second floor to the fifth floor making no stops 9kipt// e e-r(c yhykv 9zx m4z7id4w9along the way has zero acceleration all yh vckt 9eedz9(7/wm4- r4p9i y/kzixthe 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 movesc1b zrpqv2sihko: 42x kk(1vk5-v+p n from $x_1=2.1 \mathrm{~cm}$ to $x_2=-5.1 \mathrm{~cm}$ during the time from $t_1=0.9 \mathrm{~s}$ 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 $t_1=-2.6 \mathrm{~s}$ is at $x_1=2.5 \mathrm{~cm}$ and at $t_2=3.9 \mathrm{~s}$ is at $x_2=7.7 \mathrm{~cm}$. 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 laps ufjq3r 8 3,ivuaround a quarter-mile ($1 \; mile = 1609 \; m$) track in a total time of 11.2 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 straigin)i.qa p npllf(a;* +ht line, moving 114 m away in 10.8 s. It then turns abruptly and gallops halfway back in 4.6 s. Calculate (a) its an.p qfiil;pl *a) +na(verage 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 fromc yzh;b-epgpef . 4e+1 $12 \; m/s$ to $22 \; m/s$ in 4.3 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 from5sdy*qcnjg5/ k0 +qmj $20 \; m/s$ to rest in a distance of 60 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 reach 8,j mpw5 2xy f9mbxo9ua speed of $30 \; m/s$ for takeoff. How long a runway is needed if the (constant) acceleration is $2.9 \; m/s^2$ ?  (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 out of the blocks to essentially top speed abov4x)wfh je8:cut x4:e vw c)8fhj$10.6 \; m/s$ in the first 14.1 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 fjrj86bg w;2v q r6q1dvr1w1bs rom a speed of $17 \; m/s$ to rest in 5.35 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 the highwvvv* e.rumxh1e5yicq yjp1 5x::. uz 8ay. Assuming a decelerationc.5vx vim85 vhy : z.*qj:pxre1u ue1y 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 g(esy va6()polq vt1;g *)q ffuoing $25 \; m/s$ 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.o*9otqjk9wawj7w4nlv 2n1 -d After exactly 27.0 min, thq*d49 owo lva29njtjkww 7n1- ere 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 top of a cliff. It hits the ground below after c4+f5vhuuiu3uq7sd 53 tg(wj $1.57 \; s$. 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 f3 ykbcb13mglil 429 zqrom the top of the Empire State Build9z314 gblmcb2k yqi3ling (370 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 straight up into the air with a speed 2dzbj)o; pg2csas2u +0desi) k1r4nt 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 kszxl3v6 d-z6a ball 3.0 s after throwing it vertically upward. (a) With what speed did he throw it? z-3z 6kl6sd vx (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 vertically with a speyseglxn6s)k;4 ho4 (t ed of $5.05 \; m/s$. At a height of 89 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 o2egi 2(dzm2mrd with a speed of $13 \; m/s$. (a) How fast is it moving when it reaches a height of 9.1 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 0.19 s to travel past a window 1.7 dwn4; se p7slai.:;ap m tall. From what height above the top of the window did the stoa4:;i n lwde7p.p;sasne 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 strikin - z/(igsyy+e7,oa0k c:msqgvg the ocean is heard 2.7 s later. If the speed of s:ogkgy ,vcs+sqz y(ma0-e i7/ound 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 vertnai nloz 16o z)l/.5ijically upward with a speed of $8 \; m/s$ from the edge of a cliff 68.9 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 th wc-t*q :cq rdwpt2-;ie 9th floor (28 m above the stre -ttc :r;2*qq-wcpidwet) with a vertical speed of $12 \; m/s$. 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 cg. 7cb;hrv7fabout one-sixth what it is on Earth. If an object is thrown vertically upward on the Moon, how man vcgrhf7.7bc;y 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 front of the ( 8dh 4.mcf) yhc1x 4qlf/:eoa a0.tb;nulxpytrain has4(ty fp/y aombd xc cnq;x.4llf8eua0h: h1.) a speed of $23 \; m/s$ when it passes a railway worker who is standing 162 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 freight train traveling at a constan*/ka, issixtas,;lsht:y u1 :t 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 654xd pg4gccsf2rup 0high building. A second stone is dropped 1.36 s later. How far apart are the stones when the 40udp crs456gg 2xpfcsecond one has reached a speed of $11 \; m/s$?  (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 muzgdr* o zu1-,hst average $200 \; km/h$ over the course of a time trial lasting ten laps. If the first nine laps were done at $190 \; km/h$, 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, from rest, with an acceledana+cls x5d)s3m 5l64ge q8yration 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 knfz,.(e xu b jqud5fy2b4(8+ )tpu pfthe roof of a building; 1.47 s after that, a second stone ju5 , zqpt2bu x8uf) 4+.y(ebpfdn(fkis thrown 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 resistance, how long would it take a free-falling park ,+ka,0+5 b.vxrbra; uo4jj f b5paekachutist to fall from b oxkk.ju bf,45e,bpvkaj5aar r ++0;a plane at 4022 m to an altitude 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(gffg g2)/+sbuw:k9 hzyye/a a speed 1.2 times faster than Joe can. How many times higy9ub2gwy(: )k s+eggha/f/z fher 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 w)0i7pg wpqdad1/h 3qw 31qsswhile your friend stands on 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 just comes to rest in your hand. What is t7gsswwap / qp11 wq) dh0i3d3qhe 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 toszzes 6;k dw8l/d3di- ll s3+b) ep2zx find the height of a particular building. They take a stone to the rk lxzds26e/)lsze3 8bdl- + 3s dpwz;ioof 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 does the difference in time make for the estimates of the building’s height?  (数值)  $m$

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