2023-2024学年黑龙江龙东联盟高一期末考试(24-607A)(物理)试卷答案

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2023-2024学年黑龙江龙东联盟高一期末考试(24-607A)(物理)试卷答案试卷答案

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2023-2024学年黑龙江龙东联盟高一期末考试(24-607A)(物理)试卷答案

8.甲、乙两物体沿同一直线运动,它们的x-t图像如图所示,其中甲是顶点过原点的抛物线的一部分,乙是过点(0,2)的一条直线,两图像相交于坐标为(2,6)的P点,下列说法正确的是CA.甲物体做加速度逐渐增大的加速直线运动B.乙物体做匀速直线运动的速度大小为3m/sC.前2s内,甲、乙两物体的速度可能相同D.甲、乙两物体在前2s内的平均速度相同6

2023-2024学年黑龙江龙东联盟高一期末考试(24-607A)(物理)试卷答案

1.关于原子核的衰变,下列说法正确的是A、每发生一次α衰变,生成核比原来的原子核的中子数减少了4B.每发生一次α衰变,生成核比原来的原子核的电荷数减少了4C.每发生一次β衰变,生成核比原来的原子核的中子数减小了1D.每发生一次β衰变,生成核比原来的原子核的电荷数减小了1

(3)如图乙所示,若实验过程中遗漏了记录平抛轨迹的起始点,也可按下述方法处理数据:在轨迹上取A、B、C三点,A、B间和B、C间的水平间距相等且均为x,测得A、B间和B、C间的竖直间距分别是y1和y2,,可求得钢球平抛的初速度大小为,B点距离抛出点的高度差为。(已知当地重力加速度为结果均用y1、y2、x表示)