Thicknet used 5mm coax, thinnet used 10mm.
No, but they will have a coaxial INPUT.
Coaxil speakers share one coil, magnet and drive piston whereas a 2-way speaker has 2 individual coils for the speaker and tweeter which make for generally better quality.
I suppose you meant coaxial cable. As the name suggests, coaxial cables comprise of a signal wire, usually made of copper, surrounded by a meshwork of stranded wires all around.There is NO electrical contact between the two concentric conductors, which is separated by an insulator usually made of teflon. It is as if an outer cylinder comprising of the meshwork, inside which the copper wire is placed, in the same longitudinal (axis) orientation. It is of importance in applications where electromagnetic interference is unwanted. The outer meshwork acts as an electromagnetic shielding, thus minimizing interference. Used in cable TV, medical equipments and many other applications.