山东省博兴县2018_2019学年高二物理上学期期中试题(扫描版).doc

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1、 1 -山东省博兴县 2018-2019 学年高二物理上学期期中试题(扫描版)- 2 - 3 - 4 - 5 - 6 - 7 -高二物理参考答案一、选择题(15 小题,共 60 分。 )题号 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15答案 B D A B B B B C D C BD AD AD BD BD第 110 小题,每小题只有一个正确答案, 每小题 4 分;第 1115 小题为不定项选择,每小题有一个或几个正确答案,全部选择正确得 4 分,选择正确但不全得 2 分,不 选、多选或错选得 0 分。二、实验题(共 10 分)16共 4 分1.0; 1.3(1.

2、25) 每空 2 分,共 4 分 。17(1) ,;(2) ; 每空 1 分,3 分(3) m1 m1 m2 3 分,共 6 分。三、计算题(3 小题,共 30 分)18(8 分)解:(1)小球刚好通过最高点,则: m g = m v2 / l 得 v= ( g l )1/2 3 分,(2)小球从最高 点运动到最低点,机械能守恒:mg2l = 1/2mv 低 21/2m v2 4 分,v 低 = ( 5g l )1/2 1 分,19(10 分)解:(1)小球从 A 点运动到 B 点,机械能守恒:mgh = 1/2mvB2 得: vB = ( 2g h )1/2 = (10 )1/2 3 分,对

3、小球的平抛过程,H=1/2gt 2 t = (2H/g )1/2 = (5 )1/2/5s = vB t = (10 )1/2(5 )1/2/5 = (2 )1/2 3 分,(2)小球运动到 B 点,绳受力最大:FT m g = m vB 2 / l ,得:F T =20N 4 分,20(12 分)解:(1)物块滑离时,有: m g = m v2 / R3 分,对其平抛过程: v = s / ( 2H/g )1/2 = s(g /2H )1/2 = 1m/s3 分,- 8 -得:= v2 / g R = 0.2 2 分,(2)物块落地点到转台圆心的距离:由几何关系, x = (R2H 2s 2 )1/2 = 1.02m4 分,

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