安徽省2023~2024学年度届八年级阶段诊断 R-PGZX F-AH(一)z物理考试试卷

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安徽省2023~2024学年度届八年级阶段诊断 R-PGZX F-AH(一)z物理试卷答案

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安徽省2023~2024学年度届八年级阶段诊断 R-PGZX F-AH(一)z物理第一部分

(3)利用记录的多组土壤长度L和电阻R的数据,绘制如图乙所示的R-1L关系图像。土壤的电阻率为Ω⋅m。,(结果保留3位有效数字)

安徽省2023~2024学年度届八年级阶段诊断 R-PGZX F-AH(一)z物理第二部分（待更新）

(2)(10分)甲、乙两列简喈横波分别沿x轴负方向和正方向传播,两波源分别位于x=0.9m处和x=-0.6m处,两列波的的波速大小相等,波源的振幅均为2cm,两列波在t=0时刻的波形如图所示,此时平衡位置在x=-0.2m和x=0.1m处的P,Q两质点刚要开始振动.质点M位于x=0.3m处,已知甲波的周期为0.8s,求:(i)乙波传播到M质点所需要的时间;()在02.5s时间内,M质点沿y轴正方向位移最大的时刻.