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安徽省2023-2024学年七年级下学期期中教学质量调研物理试卷答案试卷答案

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安徽省2023-2024学年七年级下学期期中教学质量调研物理试卷答案第一部分

15.(8分)开车出行常用手机导航,如图甲是一种车载磁吸手机支架,手机放上去会被牢牢吸附。图乙是其侧视图,支架斜面的倾角=53^(53^=0.8,53^=0.6)。若手机质量m=二,最大静摩擦力与滑动摩擦力大小相0.30kg,手机与支架接触面间的动摩擦因数=0.25,64-9取等,g取10m/s^2。,则在汽车做匀速直线运动的过程中9+6473(1)若没有磁吸力,请通过计算说明手机会不会滑下来;,求支架对手机的弹力和摩擦力的大小。(2)若磁吸力F=8N,手机-吸盘甲

安徽省2023-2024学年七年级下学期期中教学质量调研物理试卷答案第二部分（待更新）

7.如图甲所示,两个质点A、B沿着x轴正方向运动,t=0t=0时刻,A位于坐标原点O,B位于A的右侧与A相距xo,x0,t=0从t=0时刻开始计时,它们的速度v随时间t变化的图像如图乙所示,在整个运动过程中,质点A并未与质点B发生碰撞,下列说法正确的是A工x0甲v/(ms^-1)3A2BA质点A的加速度是质点B加速度的2倍B.0∼2s内,质点A和B的距离越来越大C.2s∼4s内,质点A和B的距离越来越小1234t/s乙Dx0的值可能小于1m