Hello please help i’ll give brainliest

First answer.

Explanation:

There may be a 5N force, but if the frictional force also equals 5N, than they cancel eachother out, resulting in the brick still staying still, as it is resting on a (perfectly) level surface, but any amount of force would make the brick move.

found in the nucleus

has mass of one amu

vapour or gas assuming atmospheriv pressure