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9 players
No, there are many NBA players of different races.
VARIOUS
A different number in each Olympiad.
There are many different companies that manufacturer blue-ray players. Two examples are LG and Samsung.
36
28
JOHNNY UNITAS WAS ONE.
Yes, many different electronic brands offer Blu-Ray players. You can read reviews and rating on the different brands here: http://www.blu-ray.com/players/
It depends on whether pairs can consist of players from the same team.
reviews.cnet.com/mp3-players/ is the popular web site for these of reviews. They have many added often so check it out and see what they have.
There are different rules about this for different Competitions and in different Countries and States.