陕西省2023-2024学年七年级第二学期期末教学质量检测-(物理)试卷答案

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陕西省2023-2024学年七年级第二学期期末教学质量检测-(物理)试卷答案试卷答案

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陕西省2023-2024学年七年级第二学期期末教学质量检测-(物理)试卷答案第一部分

15.(15分)如图甲所示,足够长光滑平行金属导轨MM'、NN'(电阻均不计)水平放置,左端与边长为L=0.3m,总电阻为2.0Ω,右开口的单匝正方形金属框相连,线框内有按如图乙所示规律变化的磁场,其方向竖直向下。导轨的ABDC区域和M'N'‘右侧区域内有竖直向下的匀强磁场,磁感应强度大小均为2T。。长度均为完全相同的金属棒a、b水平放置在导轨上,与导轨垂直且接触良好,质量均为m=0.2kg,电阻均为:2.0Ω,t=0时刻,金属棒a在水平拉力F作用下静止在AB(在磁场内)位置,金属棒b放置于CM'N'D区域的某位置。在t=0.02s时,撒去F,同时给金属棒a一水平向右、大小v0=5m/s的初速度,从t=0时刻到金属棒a刚从CD离开时,金属棒b产生的总热量Q5=0.24J;金属棒a、b碰撞后粘合在一起。求:(结果均保留两位有效数字(1)t=0.01s时,M、N两点间的电势差U10;及此时的拉力F;(2)金属棒a离开CD时的加速度a;(3)从t=0时刻到金属棒a离开CD时,通过金层檸b的电荷量q6(4)在整个过程中开口线框产生的热量

陕西省2023-2024学年七年级第二学期期末教学质量检测-(物理)试卷答案第二部分（待更新）

10.我国在探索宇宙文明过程中取得了重大突破,中国科学院高能物理研究所公布:在四川稻城的高海拔观测站,成功捕获了来自天鹅座万年前发出的信号。若在天鹅座有一质量均匀分及布的球形“类地球”行星,其密度为ρ,半径为R,自转周期为T0,引力常量为G,则下列说法正确的是C.该“类地球”行星表面重力加速度在两极的大小为A.该“类地球”行星的同步卫星的运行速率为2RT0B.该“类地球”行星的同步卫星的轨道半径为oGT0^2343GpRD.该“类地球”行星的卫星在行星表面附近做匀速圆周运动的速率为2RG3