[今日更新]安徽省2023-2024学年度下学期八年级期中考试（无标题）.物理试卷答案

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[今日更新]安徽省2023-2024学年度下学期八年级期中考试（无标题）.物理试卷答案试卷答案

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6.如图所示,两个半径均为R的光滑14装置固定在竖直平面内。若将质量为m的小球从AB轨道的不同位置由静正释放m小球将从BD轨道上的不同位置脱离。空气阻力不计,设释放点P和脱离点CBD轨道圆心O,、O的连线与竖直方向的夹角分别为0、,下列说法正确的是O2、O1

(3)下拉物块Q,使物块Q上的遮光条中心和B点平齐,由静止释放物块Q(通过光电门后不会碰到定滑轮O2),记录遮光条通过光电门的挡光时间,则遮光条通过光电门的速度大小为(用题中所给物理量的字母表示)

10.如图所示是一圆台形状的玻璃柱,一红色细光束a与圆台母线AB成θ=60°入射,折射光束b与=60^=37^,cAB成β=37°,c为反射光束,a、b、c与AB位于同一平面内,sin37°=0.6,sin53°=0.8则()37^=0.6,53^=0.8A.玻璃的折射率为1.2B.该红光在玻璃柱内的传播速度为2.510^8m/sC.该红光在玻璃柱中发生全反射的临界角正弦值为0.625D.若换成蓝色细光束以相同的θ角入射,角将变大