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www.1011599.com:福建省福州市2010-2011学年高二上学期期末模块测试物理试题(扫描版)_图文

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www.wujiajiaoyu.com 福州五佳教育教研中心,速提分,就选福州五佳教育

www.wujiajiaoyu.com 福州五佳教育教研中心,速提分,就选福州五佳教育

www.wujiajiaoyu.com 福州五佳教育教研中心,速提分,就选福州五佳教育

[来源:学科网][来源:学+科+网]

www.wujiajiaoyu.com 福州五佳教育教研中心,速提分,就选福州五佳教育

www.wujiajiaoyu.com 福州五佳教育教研中心,速提分,就选福州五佳教育

www.wujiajiaoyu.com 福州五佳教育教研中心,速提分,就选福州五佳教育

福州市 2010—2011 学年第一学期期末高二模块测试

www.wujiajiaoyu.com 福州五佳教育教研中心,速提分,就选福州五佳教育

物理(3-1)试卷参考答案及 评分标准

13. (8分)解: (1)电动机与电阻R串 联,电阻两端电压 U 2 ? U ? U1 = 3.0 V ……………2分 流过电阻R和电动机的电流相同,有 I 2 ? I1 ?

P 3W 1 ? ? 0.5A ………………2分 U1 6V

定值电阻R的值 R ?

U 2 3.0V ? ? 6.0Ω I 2 0.5A
2

………………………………………2分

(2)在1min内电动机 线圈发热 Q ? I rt ? 0.5 ? 1 ? 60J ? 15J
2

………………2分

14. (10分) (1)金属棒ab处于静止状态,所受合外力为零,受力如图所示。… 2分 (2)沿轨道方向列平衡方程有 BIL ? mg sin? ? 0 根据闭合电路欧姆定律,有 I ? ………3分

E R?r

………3分

N

F

mg

www.wujiajiaoyu.com 福州五佳教育教研中心,速提分,就选福州五佳教育

解得金属棒的电阻 R ?

EBL ?r mg sin?

………2分

15.(12分) 解: (1)

U AB ? U0 =103 V时,油 滴做匀速直线运动,
mgd U0 - =1.0 11 C ………………… 3分 ? mg ,得 q ? U0 d

受力平衡,故油滴带负电。有 q

(2)设当两板间的电压为U时,油滴恰好从下极板右端边缘飞出,有

y?

L 1 2 1 和 at ? d , t ? v0 2 2
U?

mg ?

qU ? ma d

……………………… 3分



md dv2 ( g ? 20 ) ,带入数据解得 U=200 V ……………………………… 2分 q L

(3) 油滴在电场中的入射点和出射点 之间的电 势差为 U ? ? 根据动能定理,有 mg ?

1 U ? 100V 2

[来源:学+科+网]

1 …………………………………… 2分 d ? qU ? ? Ek ? Ek 0 2 1 2 1 油滴从下 板右端边缘飞出时的动能 Ek ? mv0 ? mg ? d ? qU ? 2 2
带入数据解得 Ek=1.04× -7J 10 ……………………………………………… …… 2分

16. 12分) ( (1) qvB ? m 由
K]

v2 .……………………………………………………… 2分 R

[来源:学。科。网Z。X。X 。

得,粒子在磁场中做匀速圆周运动的半径为

mv 10 ?8 ? 1.2 ? 10 6 R? ? m ? 6 ? 10 ? 2 m qB 0.2

.……………………… 2分

(2)粒子在磁场中做匀速圆周运 动的周期为

T?

2?R 2 ? 3.14 ? 6 ? 10 ?2 ? s ? 3.14 ? 10 ? 7 s .…………………… 3分 v0 1.2 ? 10 6

(3)要使粒子在磁场中运动的时间最长,应使粒子轨迹 所对的 圆心角θ最大,这要求粒子从b点射出,如图所示。 因ab=2r=R,所以θ=60° …………………………………… 3分

t?

T ? 5.2 ? 10 ?8 s 6

………………… ………………………… 2分

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w.w.zxxk.c
[来源:学科网 ZXXK]

文章来源:福州五佳教育网 www.wujiajiaoyu.com(中小学快速提分,就上福州五佳教育)


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