Kepler's 3rd law for circular orbits; Building up the shell-force by integration; Spring gun.

开普勒圆周轨道第三定律；利用积分推导球壳的引力；弹簧。

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Used as a fatigue failure criterion, application of the model to the fatigue life prediction for the feeding spring of a medium calibre automatic naval gun proved to be comparatively satisfactory.

对数累积损伤模型作为—个失效判据，已在某中口径自动舰炮输弹簧的疲劳寿命预测中得到较满意的应用。

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Reliability design theory with variety of failure mode is put forth to design gun brake spring concerning the fact that there are often defects in gun brake springs.

针对某火炮刹车弹簧经常出现废品的问题，提出了考虑多种失效相关模式的可靠性设计理论，推导了计算模型，并对此进行设计计算。

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Insofar as Congress is concerned, Senate Minority Leader Mitch McConnell, the top Republican, has warned that it could be spring before any gun legislation will be considered.

FORBES: The Slippery Slope Of Gun Control: Time To Stand On Firm Ground

Now, before the National Rifle Association (NRA) and the gun manufacturing industry for which it fronts spring out of their chairs to do a victory dance, the one that celebrates the lack of definitive connection between gun laws and gun deaths and thus justifies any and all behavior, they should consider that there may be other factors that explain the data better.

FORBES: Gun Death Data Points In Both Directions

Prone to boasting and eager to impress, Hassoun even made what the defense describes as absurd claims he could make a gun out of two pieces of wood and a spring, and a bomb out of baking soda, Madden said.

NPR: Would-Be Chicago Backpack Bomber Gets 23 Years