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发表于 2016-11-21 03:17 · 加拿大
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显示全部楼层
本帖最后由 MoeVendor 于 2016-11-21 07:09 编辑
zkbskcwi 发表于 2016-11-20 23:42 
睡了一觉竟然多了这么多页。。。我想起来一个笑话
在博士生群里问:一滴水从很高的地方落下来,会不会弄 ...
A spring's mass increases whenever it is put into compression or tension. Its added mass arises from the added potential energy stored within it, which is bound in the stretched chemical (electron) bonds linking the atoms within the spring. 一个处于压缩或者拉长状态的弹簧质量增加,由于内部势能变化(化学键)
Raising the temperature of an object (increasing its heat energy) increases its mass. For example, consider the world's primary mass standard for the kilogram, made of platinum/iridium. If its temperature is allowed to change by 1 °C, its mass changes by 1.5 picograms (1 pg = 1×10−12 g).[36] 升高温度,增加质量。如果一千克的铂和铱温度变化一摄氏度,那么质量变化1 pg.
A spinning ball weighs more than a ball that is not spinning. Its increase of mass is exactly the equivalent of the mass of energy of rotation, which is itself the sum of the kinetic energies of all the moving parts of the ball. For example, the Earth itself is more massive due to its daily rotation, than it would be with no rotation. This rotational energy (2.14×1029 J) represents 2.38 billion metric tons of added mass.因为转动的球动能更大所以就更重。这是相对论。
https://en.wikipedia.org/wiki/Mass%E2%80%93energy_equivalence |
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