You observe a main sequence star with strong hydrogen absorption lines. What is the likely surface temperature of this star

Is it possible to use the energy from two atoms colliding to create a clean burning lasting fuel source with a large amount of force? is it also possible to harness that energy from the two atoms colliding to create a clean energy source that will last for years from just two atoms colliding. is there a possibility to control and store that energy for years but slowly let the energy out enough to power cities cheaper and faster.

In the first law of thermodynamics, triangle e=q-w, what does q stand for

What is a subatomic particle with a negative charge and very little mass?