最新北京交通大学大学物理学 下 答案.doc

of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of tof rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
〔1〕、〔2〕式联立得：
-14atm(即约为10-10mmHg的压强),试问在室温(300K)下在这样的“真空〞中每立方厘米内有多少个分子？
解： 由 得，

=,充以温度t1=150C的氢气,当温度升高到370C时,维持其气压p及体积不变,气球中局部氢气逸出,,由这些数据求氢气在00C,压力p下的密度.
解：



由 〔1〕
〔2〕
〔3〕
〔4〕 由以上四式联立得：

,
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities66
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities3
of rural drinking water sources, protection of drinking water sources in rural areas by the end of the delimitation of the scope of protection, complete with warning signs, isolating network protection facilities
,方向与平板成60º夹角,. [×103Pa]
解：

以下系统各有多少个自由度:⑴在一平面上滑动的粒子；⑵可以在一平面上滑动并可围绕垂直于该平面的轴转动的硬币；⑶一弯成三角形的金属棒在空间自由运动.
解：〔1〕 2 〔2〕 3 〔3〕 6
容器内贮有氧气,其压强,温度t=270C,求: (1)单位体积内的分子数;(2)分子的质量m;(3)氧气的密度;(4)分子的方均根速率;(5)分子的平均平动能；(6)在此温度下,4g氧的内能.
解：(1) 由 得,

(2)
(3)
(4)
(5)
(6)
１mol氢气,在温度270C时,求⑴具有假设干平动动能；⑵具有假设干转动动能；⑶温度每升高10C时增加的总动能是多少？
解: (1)