重庆八中2024-2025学年度上学期高三年级入学适应性训练(物理)试卷答案

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重庆八中2024-2025学年度上学期高三年级入学适应性训练(物理)试卷答案试卷答案

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选项中有两项为多余选项

选出可以填入空白处的最佳选项

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重庆八中2024-2025学年度上学期高三年级入学适应性训练(物理)试卷答案

16.(18分)如图所示,两个完全相同的木板A、B放在粗糙水平面上,木板质量M=1kg,,板长L=3.4m,相距s=2m,质量为m=3kg物块C(可视为质点)放在木板A左端。已知物块与木板间的动摩擦因数1=0.3,,木板与地面间的动摩擦因数2=0.2a初始时A、B、C均处于静止状态,现对物块C施加一水平向右,大小恒为15N的外力F,一段时间后木板A与B发生碰撞并粘在一起,当物块C滑上木板B的瞬间去外力F0,重力加速度g取10m/s^2,,求(1)施加外力F时,木板A和物块C的加速度大小;(2)恒力F作用的时间;(3)物块C最终能滑离木板B吗?如果能,求物块C滑离木板B时的速度;如果不能,求物块C距离木板B右端的距离。

重庆八中2024-2025学年度上学期高三年级入学适应性训练(物理)试卷答案

(1)如图a所示,用两个弹簧测力计通过细绳沿平行于木板的不同方向同时拉橡皮筋,将橡皮筋的B端拉至某点O,记下O点位置和两细绳的方向,并读出两个拉力的大小分别为F1=N和F2=2.00N;

11.(15分)电磁撬可推动重超一吨的物体以超过1000km/h的时速沿直线运动,电磁撬的加速能力随轨道长度的增加而增大。电磁撬试运行时从轨道的一端A由静止开始以恒定加速度做匀加速运动,途径B、C、D三个标志物,B、C间距为1.75公里,C、D间距为2.25公里,且电磁撬经过BC区间与CD区间的时间相等,最终电磁加速至轨道的另一端E时时速达到1029km/h。(1)求A、C之间的距离;(2)若电磁撬经过BC区间与CD区间的时间均为10s,求电磁撬加速轨道的长度。