湖南省衡阳县第四中学2019届高三物理10月月考试题(扫描版).doc

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1、 1 -湖南省衡阳县第四中学 2019 届高三物理 10 月月考试题(扫描版)- 2 - 3 - 4 - 5 - 6 - 7 -参考答案一、选择题题号 1 2 3 4 5 6 7 8答案 C C B B A AC AB BD二、填空9. 答案 (1)频闪仪的闪光频率等于水滴滴落的频率 (2)9.72 2.27 (3)存在空气阻力(或水滴滴落的频率变化)10. (1)B 只用一个弹簧测力计,通过细绳把橡皮筋与细绳的连接点拉到 O 点(2)F (3)DCABEG (4)3. 00 (5)变大 变大三、计算11. 解析 在第一段时间间隔内,设甲的加速度为 a,则乙的加速度为 3a,此过程中甲的位移

2、 x 甲 1 at2,末速度 v 甲 at,12乙的位移 x 乙 1 3at2,末速度 v 乙 3 at.12在第二段时间间隔内,甲的加速度为 3a,乙的加速度为 a,此过程中甲的位移 x 甲 2 att 3at2 at2;12 52乙的位移 x 乙 23 att at2 at2,12 72甲 、 乙 两 质 点 各 自 在 这 两 段 时 间 间 隔 内 走 过 的 总 路 程 分 别 为 x 甲 x 甲 1 x 甲 2 3at2, x 乙 x乙 1 x 乙 25 at2,则总路程之比 .x甲x乙 3at25at2 35答案 3512. 解析:如图甲所示,分析 P 点受力,由平衡条件可得FA

3、cos 37 G1,- 8 -FAsin 37 FB,联立解得 FB6 N,再分析 B 的受力情况如图乙所示,由物体的平衡条件可得Ff G2sin 37 FBcos 37,FN FBsin 37 G2cos 37,FB FB,联立解得 Ff64.8 NFN76.4 N.答案: (1)64.8 N (2)76.4 N13. 解析:由几何关系可知入射角 i45,折射角 r30nsin isin r可得 n .2在玻璃砖中光速 vcn光束经过 SD 和玻璃砖内的传播时间相等,有SDc BDsin 30v可得 SD d.答案: d2附加题:1. 答案 ACD2.答案:C3.答案 BD4. 解析:作出光路图如图所示:- 9 -由折射定律知所以 sin 2=nsin 1= 2=60由图知 L1=Rtan 60,L2=Rtan 30所以 L=L1+L2=R(tan 60+tan 30)0 .23 m。答案:0 .23 m

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