2024届炎德英才大联考长郡中学高三月考试卷(三)z物理考试试卷

2024届炎德英才大联考长郡中学高三月考试卷(三)z物理试卷答案,免费查试卷答案网站目前收集并整理关于2024届炎德英才大联考长郡中学高三月考试卷(三)z物理得系列试题及其答案，更多试题答案请关注我们

2024届炎德英才大联考长郡中学高三月考试卷(三)z物理试卷答案

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2024届炎德英才大联考长郡中学高三月考试卷(三)z物理第一部分

11.(14分)如图所示,一根劲度系数为k的轻质弹簧上端固定在光滑斜面顶端,斜面倾角为30^。,下端连接一物块A,A下面用细线连接一质量为m的物块B,物块B距离斜面底端为l.开始时系统处于静止状态,现在剪断细线使B自由下滑,A沿斜面向上运动,当B滑到斜面底端时,物块A刚好第一次到达最高点,此时弹簧对A的拉力为mg。已知弹簧始终处于弹性限度内,重力加速度为g,求:(1)弹簧与A组成的系统振动周期;(2)物块A的质量;(3)A从最低点运动到最高点的过程中,弹簧的弹性势能减少量。

2024届炎德英才大联考长郡中学高三月考试卷(三)z物理第二部分（待更新）

4.计算机键盘为电容式传感器,每个按键下面由相互平行、间距为d的活动金属片和固定金属片组成,两金属片组成一个平行板电容器,其内部电路如图所示。只有当按键的电容改变量大于或等于原电容的50%时,传感器才有响应,下列说法正确的是A.按下按键的过程中,电容器的电容减小B按下按键的过程中,电流方向从b指向C.盐开按下的按键后,电容器两端的电压减小D.按键被按下一时,传感器会有响应