[今日更新]河南省镇平县2023-2024学年第二学期七年级期中学情调研试卷.物理试卷答案

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(2)为了尽可能准确地测出水果电池组的总电动势和总内阻,使用的实验器材有电压传感器(可视为理想电压表)滑动变阻器(最大阻值足够大)、电流传感器、导线、开关等。实验电路如图b所示,请根据图b在图c中完成实物连线。

G1,3.已知“祝融号”火星车在地球表面受到的重力大小为G,在火星表面受到的重力大小为G2;地G2;R1、R2。球与火星均可视为质量分布均匀的球体,其半径分别为R:、R。若不考虑自转的影响且火星车的质量不变,则地球与火星的密度之比为A.G1R1G2R2B.G1R2G2R1C.G2R2G1R1D.G1R2^2G2R1^2

10.如图甲所示,边长为L、电阻为R的正三角形金属框ACD由粗细均匀的金属棒组成,绝缘细线一端连接AC的中点G将金属框吊在天花板上的O点,金属框处于静止状态,金属框部分处于垂直金属框平面向外的匀强磁场中,磁场的磁感应强度大小为B,金属框AD、CD边的中点E、F在磁场的水平边界上,重力加速度为g.现让磁感应强度按如图乙所示规律变化,图甲中磁场方向为正方向,t=0时刻悬线的拉力恰好为零,细线能承受的最大拉力为金属框重力的2倍,则下列判断正确的是