massless neutrino 无质量中微子
massless pc PC版
massless electron 没有静质量
massless theories 无质量理论
massless base 无质量地基
massless rigid element 推广无质量刚性元 ; 无质量刚性元
massless Dirac particle 无质量狄拉克粒子
Massless Quark 零质量夸克
We call that a massless string.
我们叫它无质量绳。
Let's call it a massless spring.
我们叫它无质量弹簧。
The Standard Model said they should be massless.
标准模型说他们应当没有质量。
So, a massless body cannot have a net force on it, because the acceleration of the rope cannot be infinite.
所以没有质量的物体不会受到力,因为绳子的加速度不可能是无穷大
And that's really neat to think about, because photons, of course, are massless particles, they have no mass, so it's neat to think about something that has no mass, but that actually does have a momentum.
而且那真的不容易想明白,因为光子,当然是无质量的粒子,它们没有质量,所以这个真的不容易想明白,一些物体没有质量,但是它们事实上确实有动量。
So, massless bodies will always have, like a massless rope, equal and opposite forces on the two ends.
所以无质量的物体,比如这个绳子,两边所受的力永远都相等
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