The F-35 will be used by the U.S.Air Force and also by the Navy to fly off of aircraft carriers.

VOA: standard.2009.07.21

We are constantly looking for values of F and we're constantly looking for responses or bodies to a known force.

我们不断地寻找 F 的值,我们不断地探索已知力对物体的作用

耶鲁公开课 - 基础物理课程节选

It will typically look like this and the formula we say is F = - kx, where k is called "The force constant."

图像看上去一般就像这样,对应的式子是 F = - kx,k 叫做"弹性系数"

耶鲁公开课 - 基础物理课程节选

Five minutes later, four U.S. Air Force F-16 fighters from nearby Luke Air Force Base will conduct a fly-over in the "missing man" formation.

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Air Force F-15E fighter jets will launch the new weapon, which would find its target either by a laser or satellite guidance system.

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The Lockheed Martin F-35C that the Navy is officially planning to buy is a stealthy, single-engine strike fighter derived from the same technologies as the Air Force F-35A and Marine Corps F-35B.

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