山西省朔州市23-24第一学期三阶段检测八年级试题（卷）物理试卷答案试卷答案,炎德英才答案网站目前收集并整理关于山西省朔州市23-24第一学期三阶段检测八年级试题（卷）物理试卷答案试卷答案得系列试题及其答案，更多试题答案请关注我们

山西省朔州市23-24第一学期三阶段检测八年级试题（卷）物理试卷答案试卷答案

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山西省朔州市23-24第一学期三阶段检测八年级试题（卷）物理试卷答案第一部分

15.(18分)如图所示,质量m=1kg的滑块B静止于光滑平台上,B的左端固定轻质弹簧。平台右侧有一质量M=4kg的小车C,其上表面与平台平齐,小车与水平面间的摩擦不计。平台左侧的光滑圆弧轨道与平台平滑连接,圆弧道半径R=1.6m,,其左侧端点P与圆心0的连线与竖直方向的夹角为60^,,现将滑块A从P点由静止开始释放,滑块A滑至平台上挤压弹簧,经过一段时间弹簧恢复原长,滑块B离开平台滑上小车C,最终滑块B恰好未从小车C上滑落。已知滑块B与小车C之间的动摩擦因数甲=0.4,小车的长度L=0.9m,,滑块A、B均可视为质点,重力加速度取g=10m/s^2。求:(1)滑块B刚滑上小车C时的速度大小v0;(2)滑块A的质量m0;(3)该过程中弹簧弹性势能的最大值Ep。

山西省朔州市23-24第一学期三阶段检测八年级试题（卷）物理试卷答案第二部分（待更新）

12.甲、乙两车在同一平直公路不同车道上行驶的位移随时间变化的关系图像如图所示.已知乙车做匀变速直线运动,其图线与t轴相切于4s处,则0~4s过程中,下列说法正确的是A.甲车做匀加速直线运动B.甲车的位移大小为40mC.乙车的加速度大小为5m/s^2D.乙车的位移大小为80m