The buoyant force must be greater than water.
Atoms are basically tiny structures that make up everything. And a compound is something used in a scientific expirement. I don't get the question. You used improper grammar
They can either cancel each other or add up to a resultant force with a certain direction and modulus.
Newton's second law states that F=m*a, where F is the resultant force, ie ΣF.
It depends, You have to have the length and the width of the crest wave.
I think everything looks good but 2 might not be right, it might be B
