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曾见过几本教学参考资料中有下面的习题:如图所示:在横截面积为100厘米~2的气缸内,被质量为 m~A=6.8千克的活塞封闭着一定质量的气体,气缸内有一质量为100克的空心球.如果气缸内的温度为17℃.并在活塞上放一个质量为 m_B=13.6千克的物体时,空心球刚好对缸底无压力:那么当把物体 B 拿走后。同时气缸温度下降为7℃时.空心球对缸底的压力是多大?(设大气
The following exercises have been seen in several teaching reference materials: As shown in the figure: In a cylinder with a cross-sectional area of 100 cm~2, a mass of gas is enclosed by a piston of mass m~A=6.8 kg, There is a hollow ball with a mass of 100g in the cylinder. If the temperature in the cylinder is 17°C and an object of mass m_B = 13.6kg is placed on the piston, the hollow ball is just no pressure on the bottom of the cylinder: then when the object B is Take it away. At the same time, when the cylinder temperature drops to 7°C, what is the pressure of the hollow ball against the bottom of the cylinder?