有一个环形轨道。
张力做了功吗,在环形轨道的例子里,也许法向力做了功?
Is the tension doing any work and in the case of my circular track is, perhaps, the normal force doing any work?
它满载食物,燃料,零部件以及环形轨道前哨急需的物资。
It was laden with food, fuel, spare parts, and much needed supplies for our orbiting outpost.
You've got negative charge in motion, and it's in a circular orbit.
负电荷在运动,它们处在一个环形的轨道中。
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