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河南省2023~2024学年度八年级综合素养评估(八)R-PGZX C HEN-(物理)试卷答案试卷答案

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第二节（满分25分）阅读下面材料，根据其内容和所给段落开头语续写两段，之一囊

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河南省2023~2024学年度八年级综合素养评估(八)R-PGZX C HEN-(物理)试卷答案第一部分

河南省2023~2024学年度八年级综合素养评估(八)R-PGZX C HEN-(物理)试卷答案

3.如图所示,水平地面上放置一个质量为1kg的物块A,在A的上面放置另一个质量也为1kg的物块B,已知A与地面之间的动摩擦因数为1=0.5,A、B之间的动摩擦因数为2=0.2.现在给物块A施加一个与水平方向夹角为=37^、斜向右上方、大小恒为10N的力F,则物块B所受的摩擦力(重力加速度g取10m/s^2,37^=0.6,37^=0.8)()

河南省2023~2024学年度八年级综合素养评估(八)R-PGZX C HEN-(物理)试卷答案第二部分（待更新）

(2)用制成的小孔成像观察仪观察景物时,移动圆筒位置,增大光屏与小孔之间的距离,则光屏上的像将(选填“变大”“变小”或“不变”),像的亮度(选填“变亮”“变暗”或“不变”)。