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8.一輛汽車從車站以初速度為零勻加速直線開去,開出一段時(shí)間之后,司機(jī)發(fā)現(xiàn)一乘客未上車,便緊急剎車做勻減速運(yùn)動(dòng).從啟動(dòng)到停止一共經(jīng)歷t=10 s,前進(jìn)了15m,在此過程中,汽車的最大速度為       (   )

  A.1.5 m/s      B.3 m/s      C.4 m/s       D.無法確定

試題詳情

7.PQ、R三點(diǎn)在同一條直線上,一物體從P點(diǎn)靜止開始做勻加速直線運(yùn)動(dòng),經(jīng)過Q 點(diǎn)的速度為v,到R點(diǎn)的速度為3v,則PQQR等于             (   )

  A.l∶8        B.l∶6      C.l∶5        D.1∶3

試題詳情

6.一個(gè)物體自靜止開始做加速度逐漸變大的加速直線運(yùn)動(dòng),經(jīng)過時(shí)間t,末速度為vt,則這段時(shí)間內(nèi)的位移                        (   )

  A.x < vtt /2             B.x = vtt /2    C.x > vtt /2      D.無法確定

試題詳情

5.一物體做勻加速直線運(yùn)動(dòng),在第1個(gè)t s內(nèi)位移為x1;第2個(gè)t s內(nèi)位移為x2,則物體在第1個(gè)t s末的速度是                               (   )

  A.(x2-x1)/t             B.(x2+x1)/t    C.(x2-x1)/2t      D.(x2+x1)/2 t

試題詳情

4. 如圖所示是物體運(yùn)動(dòng)的v-t圖象,從t=0開始,對(duì)原點(diǎn)的位移最大的時(shí)刻是(    )

A.t1

  B.t2

  C.t3

  D.t4

試題詳情

3.一物體做勻減速直線運(yùn)動(dòng),初速度為10m/s,加速度大小為1m/s2,則物體在停止運(yùn)動(dòng)前l(fā)s內(nèi)的平均速度為                       (   )

  A.5.5 m/s      B.5 m/s     C.l m/s       D.0.5 m/s

試題詳情

2.一輛農(nóng)用“小四輪”漏油,假如每隔l s漏下一滴,車在平直公路上行駛,一位同學(xué)根據(jù)漏在路面上的油滴分布,分析“小四輪”的運(yùn)動(dòng)情況(已知車的運(yùn)動(dòng)方向)。下列說法中正確的是            (   )

  A.當(dāng)沿運(yùn)動(dòng)方向油滴始終均勻分布時(shí),車可能做勻速直線運(yùn)動(dòng)

  B.當(dāng)沿運(yùn)動(dòng)方向油滴間距逐漸增大時(shí),車一定在做勻加速直線運(yùn)動(dòng)

  C.當(dāng)沿運(yùn)動(dòng)方向油滴間距逐漸增大時(shí),車的加速度可能在減小

  D.當(dāng)沿運(yùn)動(dòng)方向油滴間距逐漸增大時(shí),車的加速度可能在增大

試題詳情

1.關(guān)于自由落體運(yùn)動(dòng),下面說法正確的是                   (   )

  A.它是豎直向下,v0=0,a=g的勻加速直線運(yùn)動(dòng)

  B.在開始連續(xù)的三個(gè)1s內(nèi)通過的位移之比是1∶3∶5

  C.在開始連續(xù)的三個(gè)1s末的速度大小之比是1∶2∶3

  D.從開始運(yùn)動(dòng)起依次下落4.9cm、9.8cm、14.7cm,所經(jīng)歷的時(shí)間之比為1∶

試題詳情

188.-I’ve got to go now. (2009重慶)

-Must you ?I ______you could stay for dinner with us.

A. think      B. thought   C. have thought   D. am thinking

189 Professor Williams keeps telling his students that the future ______to the well-educated. (2009重慶)A. belongs  B. is belonged  C. is belonging    D. will be belonged

190 Daniel's family    their holiday in Huangshan this time next week.(2009安徽)

   A. are enjoying    B. are to enjoy   C. will enjoy  D. will be enjoying

●答案

71-75BBDCD     76-80 BDCCC    81-85 BAABA    86-90 DCAAB   91-95ACDAC 96-100C DDAB    101-105 CACCB    106-110 CADBC  111-115BDCAD  116-120 CBDBA 121-125 DCCAD    126-130 BBDBA  131-135BDBBC  136-140CADAA  141-145ABDAD 146-150ACACA    151-155 DBBBD  156-160 CDDCA  161-165 CDADB  166-170 BADCB 171-175ACBAD   176-180CDDAA   181-185BCBCB   186-190ADBAD

試題詳情

186.- What do you think of the movie?  (2009浙江)

    - It’s fantastic. The only pity is that I __________ the beginning of it.

A Missed            B. had missed        C. miss             D. would miss

187 She stared at the painting ,wondering where she ______it.(2009重慶)

A. saw     B. has seen   C. sees     D. had seen

試題詳情


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