试题与答案

一粗细均匀的J型玻璃管竖直放置,短臂端封闭,长臂端(足够长)开口向上,短臂内封有

题型:计算题

题目:

一粗细均匀的J型玻璃管竖直放置,短臂端封闭,长臂端(足够长)开口向上,短臂内封有一定质量的理想气体。初始状态时管内各段长度如图(a)所标,密闭气体的温度为27℃。大气压强为75cmHg,求:

(1)若沿长臂的管壁缓慢加入5cm的水银柱并与下方的水银合为一体,为使密闭气体保持原来的长度,应使气体的温度变为多少?

(2)在第(1)小题的情况下,再使玻璃管沿绕过O点的水平轴在竖直平面内逆时针转过180°,稳定后密闭气体的长度变为多大?

(3)在图(b)的p-T坐标系中画出以上两个过程中密闭气体的状态变化过程。

答案:

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