The kinetic energy theorem of mass variable system is derived from the kinetic equation of mass variable body.

从变质量物体的动力学方程出发，推导出变质量系统的动能定理。

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The kinetic energy theorem of mass variable system is derived from the kinetic equation of mass variable body. The practical value of it is pointed out using an example.

从变质量物体的动力学方程出发，推导出变质量系统的动能定理。指明其实用价值，并举例加以说明。

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For the end, an equation of mass flux of jet about time deduced by the differential element method was compared to CFD results, and the influence of design parameters was analyzed.

最后利用微元法得到了射流流量随时间变化的函数关系式，并和数值模拟值进行了对比，分析了各设计参数的影响。

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He signed the letter to Franklin Roosevelt warning that it may be possible to build an atom bomb, and the letters of his famed equation relating energy to mass hover in our minds when we picture the resulting mushroom cloud.

NPR: Einstein: Relatively Speaking, a Complicated Life

It is a stubborn fact that even if we based our caloric intake on some body mass equation, or had mandated thermostat settings, it would still not solve the problem of scarcity.

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