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一、实与虚的转化用虚设的物理情境,替代实际的物理情境,往往能突破思维障碍,找出新的解题途径。例1:如图1所示,一个横截面积为 S 的圆筒形容器竖直放置。金属板 A 的上表面是水平的,下表面是倾斜的,下表面与水平面的夹角为θ,圆板的质量为M,不计圆板与容器内壁之间的摩擦,若大气压强为P_0,则被圆板封闭在容器中的气体的压强为多少?
First, the conversion of reality and imaginary uses a dummy physical situation instead of an actual physical situation, often breaking through the barriers to thinking and finding new ways to solve problems. Example 1: As shown in Fig. 1, a cylindrical container with a cross-sectional area of S is placed vertically. The upper surface of the metal plate A is horizontal, the lower surface is inclined, the angle between the lower surface and the horizontal plane is θ, and the mass of the circular plate is M, excluding the friction between the circular plate and the inner wall of the container, if the atmospheric pressure is P_0, What is the pressure of the gas enclosed in a container by a circular plate?