- #1
Lotto
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- TL;DR Summary
- According to ##E=m_0c^2## (when ##v=0##), when we add an energy to a system, its mass increases. But something like relativistic mass is just a trick. The hot coffee's particles have higher energies, but according to this logic the same masses. So, how is it?
As far as I know, something like relativistic mass is just a concept, just a trick, there is nothing like the relativistic mass. When I move faster, I have higher kinetic energy, but my mass is still the same as if I was at rest. Kinetic and potential energies do not increase object's mass.
A hotter coffee has particles with higher speeds, its energies are higher than those of a cold coffee. That is because of their higher kinetic energies. So their mass should be also the same as their "rest mass" = the only mass? But why should be then the hotter coffee's mass bigger?
Am I a bit confused about this.
A hotter coffee has particles with higher speeds, its energies are higher than those of a cold coffee. That is because of their higher kinetic energies. So their mass should be also the same as their "rest mass" = the only mass? But why should be then the hotter coffee's mass bigger?
Am I a bit confused about this.