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学科网 2025届新高三学情摸底考考后强化卷(8月)物理试卷答案试卷答案
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学科网 2025届新高三学情摸底考考后强化卷(8月)物理试卷答案第一部分
15.(16分)图(15.1)为罗马杆滑环窗帘.假设窗帘质量均匀分布在每一个环上,简化为图(15.2)所示模型.水平固定的长杆上有4个质量均为m=0.4kg的滑环,滑环均近似看成质点.若窗帘完全拉开,相邻两环间距离为L=0.2m.开始时滑环均位于长杆右侧边缘外,彼此接触但不挤压.现给1号滑环一个向左的初速度v0,其v-t图像如图(15.3)所示,已知滑环与杆之间的动摩擦因数为=0.1.假设前、后两滑环之间的窗帘绷紧瞬间,两滑环立即获得相同速度,窗帘绷紧用时极短,可忽略不计,不计空气阻力,重力加速度g取10m/s^2.求(1)1号滑环初速度v0的七小(2)若窗帘恰能完全展开,4个滑环在窗帘第n次绷紧前、后瞬间的总动能之比((n≤2);(3)若窗帘恰能完全展开,1号滑环需获得的最小初动能.
学科网 2025届新高三学情摸底考考后强化卷(8月)物理试卷答案第二部分（待更新）
14.科学家指出在距离我们大约1600光年的范围内,存在一个四星系统.假设四星系统离其他恒星较远,通常可忽略其他星体对四星系统的引力作用.四星系统的形式如图所示,三颗星位于边长为L的等边三角形的三个顶点上,并沿外接于等边三角形的圆形轨道运行,而第四颗星刚好位于三角形的中心不动.设每颗星的质量均为m,万有引力常量为G,则A.每颗星做圆周运动的向心加速度与m大小无关B.三星的总动能为Ek=3(3+1)Gm^22LC.若四颗星的质量m均不变,距离L均变为2L,则周期变为原来的2倍m.若距离L不变,四颗星的质量均变为2m,则角速度变为原来的2倍
