A.E=158.1eV B.E>2428.4eV 查看更多

 

題目列表(包括答案和解析)

帶電粒子以速度v沿CB方向射入一橫截面為正方形的區(qū)域.C、B均為該正方形兩邊的中點(diǎn),如圖13所示,不計(jì)粒子的重力.當(dāng)區(qū)域內(nèi)有豎直方向的勻強(qiáng)電場(chǎng)E時(shí),粒子從A點(diǎn)飛出,所用時(shí)間為t1;當(dāng)區(qū)域內(nèi)有垂直于紙面向里的磁感應(yīng)強(qiáng)度為B的勻強(qiáng)磁場(chǎng)時(shí),粒子也從A點(diǎn)飛出,所用時(shí)間為t2,下列說法正確的是(  )

 

A.t1<t2                B.t1>t2                                                          

C. v               D. v

 

查看答案和解析>>

帶電粒子以速度v沿CB方向射入一橫截面為正方形的區(qū)域.C、B均為該正方形兩邊

的中點(diǎn),如圖所示,不計(jì)粒子的重力.當(dāng)區(qū)域內(nèi)有豎直方向的勻強(qiáng)電場(chǎng)E時(shí),粒子

A點(diǎn)飛出,所用時(shí)間為t1;當(dāng)區(qū)域內(nèi)有垂直于紙面向里的磁感應(yīng)強(qiáng)度為

B的勻強(qiáng)磁場(chǎng)時(shí),粒子也從A點(diǎn)飛出,所用時(shí)間為t2,下列說法正確的是

(  )

A.t1<t2                B.t1>t2                                                            圖13

C.=v               D.=v

 

查看答案和解析>>

在圖所示的電路中,電阻R =2.0 Ω,電源的內(nèi)電阻r=1.0 Ω,不計(jì)電流表的內(nèi)阻.閉合開關(guān)S后,電流表的示數(shù)I=0.5 A,則電源的電動(dòng)勢(shì)E等于


  1. A.
    1.0 V 
  2. B.
    3.0 V
  3. C.
    2.0 V
  4. D.
    1.5V

查看答案和解析>>

帶電粒子以速度v沿CB方向射入一橫截面為正方形的區(qū)域.C、B均為該正方形兩邊

的中點(diǎn),如圖所示,不計(jì)粒子的重力.當(dāng)區(qū)域內(nèi)有豎直方向的勻強(qiáng)電場(chǎng)E時(shí),粒子

A點(diǎn)飛出,所用時(shí)間為t1;當(dāng)區(qū)域內(nèi)有垂直于紙面向里的磁感應(yīng)強(qiáng)度為

B的勻強(qiáng)磁場(chǎng)時(shí),粒子也從A點(diǎn)飛出,所用時(shí)間為t2,下列說法正確的是

(  )

A.t1<t2                B.t1>t2                                                           圖13

C.=v               D.=v

 

查看答案和解析>>

帶電粒子以速度v沿CB方向射入一橫截面為正方形的區(qū)域.C、B均為該正方形兩邊的中點(diǎn),如圖13所示,不計(jì)粒子的重力.當(dāng)區(qū)域內(nèi)有豎直方向的勻強(qiáng)電場(chǎng)E時(shí),粒子從A點(diǎn)飛出,所用時(shí)間為t1;當(dāng)區(qū)域內(nèi)有垂直于紙面向里的磁感應(yīng)強(qiáng)度為B的勻強(qiáng)磁場(chǎng)時(shí),粒子也從A點(diǎn)飛出,所用時(shí)間為t2,下列說法正確的是(  )

A.t1<t2               B.t1>t2                                                          
C.v              D.v

查看答案和解析>>

 

一、選擇題:共12小題,共48分。全選對(duì)得4分,選對(duì)但不全得2分。

1.BD    2.A    3.C    4.AD    5.AB    6.BD    7.A    8.B

9.C     10.D      11.B          12.B

二、實(shí)驗(yàn)題:共3小題,共23分。

13.(4分)BD

14.(9分)

   (1)ACD

   (2)AD

   (3)CD

評(píng)分標(biāo)準(zhǔn):每空3分,選對(duì)但不全得2分。

15.(10分)

   (1)如圖所示

   (2)閉合S1、S2,讀出電壓表讀數(shù)U1

        保持S1閉合,斷開S2,讀出電壓數(shù)讀U2;

   (3)6ec8aac122bd4f6e

三、計(jì)算題:共6小題,共79分

16.(12分)

受試者加速過程中

6ec8aac122bd4f6e                                                               ①

6ec8aac122bd4f6e                                                                 ②

勻速過程中

6ec8aac122bd4f6e                                                                 ③

減速過程中

6ec8aac122bd4f6e                                                              ④

6ec8aac122bd4f6e

6ec8aac122bd4f6e6ec8aac122bd4f6e                                                          ⑤

6ec8aac122bd4f6e                                                           ⑥

受試者10m折返跑的時(shí)間

6ec8aac122bd4f6e                                                           ⑦

評(píng)分標(biāo)準(zhǔn):①②③④⑦式各2分,⑤⑥式各1分。

17.(12分)

力F作用時(shí)

6ec8aac122bd4f6e                                            ①

6ec8aac122bd4f6e                                                   ②

2s末物體的速度

6ec8aac122bd4f6e                                                                  ③

撤去F物體停止的過程中

6ec8aac122bd4f6e                                                   ④

6ec8aac122bd4f6e                                                           ⑤

6ec8aac122bd4f6e                                                                ⑥

6ec8aac122bd4f6e                                                                 ⑦

評(píng)分標(biāo)準(zhǔn):①式3分,②④⑤式各2分,③⑥⑦式各1分。

18.(12分)

電子經(jīng)電場(chǎng)加速后

6ec8aac122bd4f6e                                                             ①

電子進(jìn)入磁場(chǎng)后

6ec8aac122bd4f6e                                                                 ②

6ec8aac122bd4f6e                                                       ③

6ec8aac122bd4f6e                                                           ④

評(píng)分標(biāo)準(zhǔn):①②式各3分,③式4分 ,④式2分。

19(14分)

   (1)a棒向上運(yùn)動(dòng)時(shí)

6ec8aac122bd4f6e                                  ①

對(duì)于棒b

6ec8aac122bd4f6e                                                                ②

b棒下滑到最大速度時(shí)

6ec8aac122bd4f6e                               ③

對(duì)于棒b

6ec8aac122bd4f6e                                                               ④

6ec8aac122bd4f6e                                                             ⑤

   (2)在磁感應(yīng)強(qiáng)度增大的過程中

6ec8aac122bd4f6e                                                            ⑥

6ec8aac122bd4f6e                                                   

6ec8aac122bd4f6e                                                              ⑦

6ec8aac122bd4f6e                                                                ⑧

h=1m                                                                     ⑨

評(píng)分標(biāo)準(zhǔn):①式3分,②④⑤⑧⑨式各1分,③⑥⑦式各2分。

20.(14分)

   (1)質(zhì)量為m0的物體在月球上時(shí)

    6ec8aac122bd4f6e                                                           ①

衛(wèi)星在高度為h的軌道上運(yùn)行時(shí)

6ec8aac122bd4f6e                                                     ②

6ec8aac122bd4f6e                                                    ③

(2)“嫦娥一號(hào)”噴出氣體前后

6ec8aac122bd4f6e                                                  ④

6ec8aac122bd4f6e

“嫦娥一號(hào)”在下落過程中

6ec8aac122bd4f6e                                                     ⑤

6ec8aac122bd4f6e                                                           ⑥

評(píng)分標(biāo)準(zhǔn):①②④⑤式各3分,③⑥式各1分。

21.(15分)

   (1)A球與B球第一次碰撞前做勻速直線運(yùn)動(dòng)

6ec8aac122bd4f6e                                                                 ①

6ec8aac122bd4f6e                                                                ②

6ec8aac122bd4f6e

(2)A與B第一次碰撞時(shí)速度為v0

 6ec8aac122bd4f6e                                                                ③

A與B第一次碰撞后A的速度為v1,B的速度為V1

6ec8aac122bd4f6e                                                         ④

6ec8aac122bd4f6e                                                   ⑤

6ec8aac122bd4f6e6ec8aac122bd4f6e

第一次碰撞后經(jīng)過t2時(shí)間AB兩球再次相碰

6ec8aac122bd4f6e                                                              ⑥

6ec8aac122bd4f6e                                                             ⑦

   (3)A、B第二次碰撞后速度分別為v2和V2

6ec8aac122bd4f6e                                                ⑧

6ec8aac122bd4f6e                                       ⑨

6ec8aac122bd4f6e

第二次碰撞后到第三次碰撞時(shí)

    6ec8aac122bd4f6e                            (11)

    A球第三次與B碰撞時(shí)

    6ec8aac122bd4f6e                  (12)

    圖象如圖所示

    評(píng)分標(biāo)準(zhǔn):①②④⑤式各2分,③⑥⑦式各1分,(3)問圖線4分,只按圖給分。

     

     


    同步練習(xí)冊(cè)答案