If you place two of every known atom in a container with a complete dimensional vacuum( to 12 dimensions and..

Question

you speed it up to half the speed of light, how much does it weigh, assuming it's trajectory is free of interference of any type or kind? What tempature is the experiment? and how many single atoms are there, how many composite structures are there?

Answer 1

Sounds like an impossible question to answer. But pick your best answer because bekki will outvote the other answers using her multiple accounts.

Answer 2

So this is a silly question, but I'll answer it anyway for fun.

Do you mean all known atoms or all known isotopes.  If you mean all known atoms, you have to assume the most common isotope (or an average).

So take all the known atoms (ask a chemist for the latest periodic chart) or nuclides (ditto for a table of nuclides) and add up their mass.  Their weight (on earth) will be very roughly gamma * mass * g.

The temperature is not specified by the information given in the problem.

Count the atoms and double it.

The atoms themselves and all the nucleons therein are composite structrures.  So add up the atomic masses (in amu, rounded) of the isotopes to count the nucleons.

Answer 3

You must enjoy a good joke.  Among other answers, it doesn't weigh anything because if it is moving at 1/2c then it is in outer space free of gravity.   With only two atoms the mass can be calculated but no scale (inertia scale) could measure it.    And you want a handy index of which of the 100+ elements would combine with others and which radioactive ones would decay before getting to speed.  And you don't give the size of the container and the temp is not a function of anything you give.