2011年普通高等学校招生全国统一考试物理(江苏卷)
2011年普通高等学校招生全国统一考试(江苏物理)一、单项选择题(本题共5小题,每小题3分,共计15分。每小题只有一个选项符合题意)1.(2011·江苏物理,1)如图所示,石拱桥的正中央有一质量为m的对称楔形石块,侧面与竖直方向的夹角为α,重力加速度为g。若接触面间的摩擦力忽略不计,则石块侧面所受弹力的大小为( )。A.mg2sinα B.mg2cosαC.12mgtanαD.12mgcotα2.(2011·江苏物理,2)如图所示,固定的水平长直导线中通有直流I,矩形线框与导线在同一竖直平面内,且一边与导线平行。线框由静止释放,在下落过程中( )。A.穿过线框的磁通量保持不变B...
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