下面的问题经常出现在高三物理的总复习课上:假设地球是半径为R、质量为M的匀质球体,且不考虑自转的影响,设想在地球的内部沿连接南北极的直线开凿出一条光滑的隧道,一物体从北极静止坠入隧道,试分析物体的运动规律.最近我们到中学听课学习,恰好有两所中学的物理教师为学生讲解 The following questions often appear in the senior physics review class: Suppose the earth is a homogeneous sphere of radius R and mass M, and does not consider the influence of rotation. It is envisaged that a straight line connecting the north and south poles will be carved in the interior of the earth. In a smooth tunnel, an object falls from the Arctic into a tunnel and tries to analyze the motion of objects. Recently, we went to middle school to study, and there were just two physics teachers who explained it to students.