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思博教育·河北省2024-2025学年度八年级第一学期第一次学情评估-(物理)试卷答案试卷答案

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思博教育·河北省2024-2025学年度八年级第一学期第一次学情评估-(物理)试卷答案第一部分

思博教育·河北省2024-2025学年度八年级第一学期第一次学情评估-(物理)试卷答案

5.如图所示,用一细轻杆将光滑的大圆环固定在竖直平面内,将视为质点的小环套在大环上,小环从大环的最高处由静止滑下,设小环所在位置与大环的最高处的连线与竖直方向的夹角为θ,重力加速度大小为,,则此时小环的向心加速度大小为A.gsin20B.4g^2C.4gcosD.g(2)^2

思博教育·河北省2024-2025学年度八年级第一学期第一次学情评估-(物理)试卷答案第二部分（待更新）

14.(14分)如图所示,竖直平面内有一坐标系xOy,,在x≤0的空间内存在沿x轴正方向的匀强电场,在x>0且-a≤y≤0区域内存在着彼此垂直的匀强电场和匀强磁场,匀强电场平行v轴向上,匀强磁场垂直纸面向里,两区域电场的电场强度大小相等。一质量为m、电荷量为+q(q>0)的带电小球(可视为质点)从P(一L,L)点由静止开始运动,经过坐标原点O进人第四象限,且恰好没有从y=-a射出电磁复合场区域,已知重力加速度为g,求:(1)匀强电场的电场强度大小;(2)匀强磁场的磁感应强度大小;(3)小球从离开P点到其第3次经过x轴所经历的时间。